That’s nice thank you.
I found some colors I like at a local store (it was a fun event, digging all kind of stuff with only women around looking weirdly at me).
I went out with too much stuff, at probably higher cost than what you shared!
But at least I have enough for many bass traps / grills.
It's mostly typical 60/70s colors, bright or not but fun to my eyes, especially in combo, orange, lime, light blue, marron etc.
I explained at the end while paying... it didn’t change anything to their look 🤓
Thought I was the only one who did that? 🤣🤣🤣
Hi diyers, it's been a while, I didn't do much for months.
Changed the room layout early, meaning basically reversed the speaker position and sofa so the wall of diffusors is now behind me but that's it.
I have been enjoying them since last summer. Played a bit with the target but nothing more.
But I recently had time so processed to a better tune.
After few tentatives I got one that I enjoy more, and it used a different approach.
What I already knew:
The woofers cover 20-200Hz so mostly under the Schroeder frequency (around 130Hz).
The room impact decreases up to 250-300hz, the mids have a boost around 200hz because of it, only visible at MLP.
The rest is pretty smooth due to the horns.
One nose sweep at MLP is pretty close to an average of 9 around my head dirac style, and I now know what not to touch because of this.
Well after thousand of sweeps I just have a feeling now, and I’m more gentle than ever on the eq anyway.
What I did new:
So:
At the end:
Next, for peace of mind I measured the power.
I knew it used little power but needed to know more since I'd like to try my little ACA that I finally finished.
(+ Got the Redux' and MINIs in boxes and need a little motivational boost to build them).
Tested few test tones per driver to find the max voltage per bandpass, ended with:
Horn: 10kHz, surprised that it's one using more power, more than at 3 or 8Khz.
Midrange: 500hz, no surprise here it's the middle of the natural bandpass and I don't boost it anywhere with EQ.
Woofer: 40hz (20Hz used more before with the LT, but I finally don't boost that low anymore, it's already too messy)
With -0dbfs test tones from REW played at -20/-10/-0db on the minidsp.
Well only once at -0db on the midrange just to check the stability of my measurements > all good so I proceeded with mostly -20db sometimes -10db too and then calculated the equivalent for -0db.
(surprisingly the -0dbfs test tone in REW appears as -0.3dbfs in the minidsp)
I save you the entire table but at the end here's what's needed at max volume:
Horn: maximum 3.78v at 10Khz, so 1.1 watts for 16ohms to reach -0db
Midrange: max 4.8v at 500Hz, so 2.9 watts at 8ohms to reach -0db
Woofer: max 15.3v at 40Hz, so 67 watts for 3.5 ohms to reach -0db
Don't jump on me, I don't listen at -0db! but it gives a good idea.
I spend most of my time around -20db, and occasionally near -10db for fun, so divide those numbers by 10 or 100.
That’s also why current amps are fine: Nad 316 for woofers and two rekkrs on mids and horns.
Rekkr is good up to 2 watts I think, not sure it can deliver more than 3 volts.
It has been near 2 volts occasionally on the mids, I don't remember any clipping, but I will stay off the -6db limit for now.
(Rekkr is damn good for its silence btw, absolute best I had)
Pretty cool, at least I know I can try a bunch of low power amps for mid-high, soon my little ACAs and next my tubes.
And on woofers I don't really need to change I'm covered.
Could even try class A down low if I stay gentle, but not sure it's relevant for just 20-200hz.
Cheers!
Changed the room layout early, meaning basically reversed the speaker position and sofa so the wall of diffusors is now behind me but that's it.
I have been enjoying them since last summer. Played a bit with the target but nothing more.
But I recently had time so processed to a better tune.
After few tentatives I got one that I enjoy more, and it used a different approach.
What I already knew:
The woofers cover 20-200Hz so mostly under the Schroeder frequency (around 130Hz).
The room impact decreases up to 250-300hz, the mids have a boost around 200hz because of it, only visible at MLP.
The rest is pretty smooth due to the horns.
One nose sweep at MLP is pretty close to an average of 9 around my head dirac style, and I now know what not to touch because of this.
Well after thousand of sweeps I just have a feeling now, and I’m more gentle than ever on the eq anyway.
What I did new:
- Used one sweep per driver for mids and highs, nearfield at maybe 50cm, centered on drivers.
- And one sweep at MLP for the woofers, using nearfield for them was useless anyway since it changed so much once at MLP.
- For each driver EQ I favored the use of XO and low Q EQ, like 1st order slopes with crossover points well into the bandpass.
So:
- Woofers use a Butterworth 6db at 30hz for example, so instead of boosting them with a Linkwitz transform it's just cut now.
- No more highpass on the mids, the small box is enough. Low pass BUT6 at 1600hz, almost free ride, I was a little concerned with the cone break up but I don't think I can hear it once tamed.
- horns BUT6 at 5khz, more EQ needed here, but still less than before
At the end:
- The resulting acoustic slopes are all Linkwitz-Riley 2nd orders, at 200 and 1800hz.
- A lot less eq to adjust each driver response, overall less db loss
- The tune is good, very lively, seems well integrated, there are few things that sound better (soundstage and details) but it's too early, I don't miss the LR24.
- I am not too concerned (yet) with the 1st order slopes, drivers are PA and I don't listen super loud.
- So just very pleased! I know real clean measurements would be better but that’s a step. Vituix is still in mind, maybe for summer days I'll try something.
Next, for peace of mind I measured the power.
I knew it used little power but needed to know more since I'd like to try my little ACA that I finally finished.
(+ Got the Redux' and MINIs in boxes and need a little motivational boost to build them).
Tested few test tones per driver to find the max voltage per bandpass, ended with:
Horn: 10kHz, surprised that it's one using more power, more than at 3 or 8Khz.
Midrange: 500hz, no surprise here it's the middle of the natural bandpass and I don't boost it anywhere with EQ.
Woofer: 40hz (20Hz used more before with the LT, but I finally don't boost that low anymore, it's already too messy)
With -0dbfs test tones from REW played at -20/-10/-0db on the minidsp.
Well only once at -0db on the midrange just to check the stability of my measurements > all good so I proceeded with mostly -20db sometimes -10db too and then calculated the equivalent for -0db.
(surprisingly the -0dbfs test tone in REW appears as -0.3dbfs in the minidsp)
I save you the entire table but at the end here's what's needed at max volume:
Horn: maximum 3.78v at 10Khz, so 1.1 watts for 16ohms to reach -0db
Midrange: max 4.8v at 500Hz, so 2.9 watts at 8ohms to reach -0db
Woofer: max 15.3v at 40Hz, so 67 watts for 3.5 ohms to reach -0db
Don't jump on me, I don't listen at -0db! but it gives a good idea.
I spend most of my time around -20db, and occasionally near -10db for fun, so divide those numbers by 10 or 100.
That’s also why current amps are fine: Nad 316 for woofers and two rekkrs on mids and horns.
Rekkr is good up to 2 watts I think, not sure it can deliver more than 3 volts.
It has been near 2 volts occasionally on the mids, I don't remember any clipping, but I will stay off the -6db limit for now.
(Rekkr is damn good for its silence btw, absolute best I had)
Pretty cool, at least I know I can try a bunch of low power amps for mid-high, soon my little ACAs and next my tubes.
And on woofers I don't really need to change I'm covered.
Could even try class A down low if I stay gentle, but not sure it's relevant for just 20-200hz.
Cheers!
Playing with my new sub I realized I was really hitting the wall with bad measurements...
Plus Pitt&Giblin updated their Superwax page with more details on the implementation, with a very nice power response: https://www.pittandgiblin.com.au/superwax
I don’t expect to be able to reach that level but since I share a lot of the same constrains maybe I could get close.
So I have to find a way to perform semi-anechoic measurements outside.
Do you guys have any idea for a big and heavy speaker?
I’m thinking of different paths, either just a classic turn-table just beefier on a wood superstructure,
or maybe just renting a small mass lift, if I can find one with a rotative platform, and removable guard rails...
It would solve a lot but might not be that easy to implement:
In the mean time I started to use more precise gating inside.
Since the boxes are very large and not that tall, the calculated delay for the first reflection from the floor are:
To illustrate, here with the right gating above 500Hz (so high mids and horn),
and a mix of high smoothing with no gating / and no smoothing with just enough gating for to see the midrange behavior and define some EQ. But it feels like just guessing in fact...
Based on some sims I expected to not have to deal with a hard baffle step, since it coincided with the high pass but apparently it has an effect that was masked before, a bump at 200Hz that I could sometime see.
Plus Pitt&Giblin updated their Superwax page with more details on the implementation, with a very nice power response: https://www.pittandgiblin.com.au/superwax
I don’t expect to be able to reach that level but since I share a lot of the same constrains maybe I could get close.
So I have to find a way to perform semi-anechoic measurements outside.
Do you guys have any idea for a big and heavy speaker?
I’m thinking of different paths, either just a classic turn-table just beefier on a wood superstructure,
or maybe just renting a small mass lift, if I can find one with a rotative platform, and removable guard rails...
It would solve a lot but might not be that easy to implement:
In the mean time I started to use more precise gating inside.
Since the boxes are very large and not that tall, the calculated delay for the first reflection from the floor are:
- 1.82ms for the mic 2 meters away
- 1.3ms for 3 m
To illustrate, here with the right gating above 500Hz (so high mids and horn),
and a mix of high smoothing with no gating / and no smoothing with just enough gating for to see the midrange behavior and define some EQ. But it feels like just guessing in fact...
Based on some sims I expected to not have to deal with a hard baffle step, since it coincided with the high pass but apparently it has an effect that was masked before, a bump at 200Hz that I could sometime see.
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Without you posting some measurements it’s difficult to offer anything constructive.
Assuming your woofers are in a bass reflex enclosure the modelling in a simulator will be a close approximation. You won’t be able to measure under 300 hertz without lifting it a metre up of the ground.
What l would do is try using the room boundary excel spreadsheet to determine the room gain.
With the midrange leave everything in place and measure at a distance 3 x the diameter of the driver and gate at 300 hertz. Again a simulation will tell you what the midrange is doing at the low end of its pass. Same with the horn. Keep the mic well away from the mouth to avoid reflection. Measure at 1 metre.
My suggestion is to try an overall measurement at 2 metres and smooth the response in REW at 1/3 octave. Take several measurements each side of the listening position and then average. You should then be able to make meaningful EQ adjustments.
Just remember no driver is a text book and they might tilt up or down in the pass band. Use your EQ to correct that,
If the driver has an existing slope in the crossover region move the crossover point either side a bit to achieve a good phase match.
In the end a flat response overall may not be subjective optimal and you may need to use an LF shelf EQ below 100 hertz. Trust your ears with this step not the measurements.
Good luck
Assuming your woofers are in a bass reflex enclosure the modelling in a simulator will be a close approximation. You won’t be able to measure under 300 hertz without lifting it a metre up of the ground.
What l would do is try using the room boundary excel spreadsheet to determine the room gain.
With the midrange leave everything in place and measure at a distance 3 x the diameter of the driver and gate at 300 hertz. Again a simulation will tell you what the midrange is doing at the low end of its pass. Same with the horn. Keep the mic well away from the mouth to avoid reflection. Measure at 1 metre.
My suggestion is to try an overall measurement at 2 metres and smooth the response in REW at 1/3 octave. Take several measurements each side of the listening position and then average. You should then be able to make meaningful EQ adjustments.
Just remember no driver is a text book and they might tilt up or down in the pass band. Use your EQ to correct that,
If the driver has an existing slope in the crossover region move the crossover point either side a bit to achieve a good phase match.
In the end a flat response overall may not be subjective optimal and you may need to use an LF shelf EQ below 100 hertz. Trust your ears with this step not the measurements.
Good luck
Thank you macka,
I edited the post with one measurement before you answered I guess, these were done at 2.4m.
Box is sealed for now, I might try later ported if I don’t like my sub.
House target is disabled here, it’s just easier for me to tune flat then adjust.
Ok I’ll look up the spreadsheet.
And will try at 3x the midrange size.
I did some near-field measurement before, maybe too close for the horn but it was smooth.
I didn't really track phases so far, for summing I used physical distance as starting point and bunch of sweeps to adjust.
It’s ok for mid-horn, but not for the rest it’s probably a little off, and totally bad for the sub.
I might get an xlr mic too instead of the umik, to get cleaner phases.
In following exemple I did use multiple gating to try to understand the mids, still at 240cm.
With 1.8ms, 17ms and 500ms, raw and corrected response, with No to Var smoothing.
I’d like to understand if the 200-300hz wiggles come from boundaries only or from the baffle step too.
Since it’s probably the transition area (my Schroeder frequency should be around 100Hz).
I checked mic at 3cm of the cone and the mid has no issue it can match the target perfectly if needed with just xo, but it’s just near-field.
It’s not that it sounds bad, I totally enjoy them but I’d like more precise.
I often try different settings, that can be radically different in the dsp, but not so much by ear.
Like minimal or no eq for the mids and it’s ok.
Almost like the speaker has a response ans wants to push it whatever I do (kind of). Probably related to the power response.
Sometime it’s bad of course.
So until I find a way for outside I could try to measure everything at 1,2 and 3m with the appropriate gating to see the evolution maybe.
I’ll try to find a way to raise them about 80cm so the mid would be centered in the room height, that would add some useful range for the its gating.
But damn’ they’re heavy!
I could share more measurements of course, I need to clean up... 😛
Thank you!
I edited the post with one measurement before you answered I guess, these were done at 2.4m.
Box is sealed for now, I might try later ported if I don’t like my sub.
House target is disabled here, it’s just easier for me to tune flat then adjust.
Ok I’ll look up the spreadsheet.
And will try at 3x the midrange size.
I did some near-field measurement before, maybe too close for the horn but it was smooth.
I didn't really track phases so far, for summing I used physical distance as starting point and bunch of sweeps to adjust.
It’s ok for mid-horn, but not for the rest it’s probably a little off, and totally bad for the sub.
I might get an xlr mic too instead of the umik, to get cleaner phases.
In following exemple I did use multiple gating to try to understand the mids, still at 240cm.
With 1.8ms, 17ms and 500ms, raw and corrected response, with No to Var smoothing.
I’d like to understand if the 200-300hz wiggles come from boundaries only or from the baffle step too.
Since it’s probably the transition area (my Schroeder frequency should be around 100Hz).
I checked mic at 3cm of the cone and the mid has no issue it can match the target perfectly if needed with just xo, but it’s just near-field.
It’s not that it sounds bad, I totally enjoy them but I’d like more precise.
I often try different settings, that can be radically different in the dsp, but not so much by ear.
Like minimal or no eq for the mids and it’s ok.
Almost like the speaker has a response ans wants to push it whatever I do (kind of). Probably related to the power response.
Sometime it’s bad of course.
So until I find a way for outside I could try to measure everything at 1,2 and 3m with the appropriate gating to see the evolution maybe.
I’ll try to find a way to raise them about 80cm so the mid would be centered in the room height, that would add some useful range for the its gating.
But damn’ they’re heavy!
I could share more measurements of course, I need to clean up... 😛
Thank you!
Macka, I searched for the spreadsheet but a lot of links were broken, is it something equivalent to the room wizard in REW?
Did some more measurements yesterday, at 1, 2 and 3 meters on axis.
3m being close to the MLP, just a little off since I "toe-in" the speakers a bit.
It's very interesting, I mean to see the wave taking its form, and the room/and box gradually making their thing.
Only the horns are gated accordingly to distance since resolution is just too low even for the mids to gate (less than 2ms for horns, 50 or 500 for the rest), and Left side only, no eq on woofer and mids.
So here, a gif for the summing evolution:
- bad on woofer-mid at 1 and 2m, kind of ok at 3m but could be better
I think the room interactions masked what's going on at 250Hz on my previous measurements and I did a poor job.
While at a few cm of each drivers maybe 10cm since I kept the front grill:
Overall frequency changes:
- funny to see the lows keeping their energy while highs gradually descend.
Also it descends more between 1 and 2 meters than between 2 and 3 m.
- There's a dip building up around 300-400Hz on the mids, I assume the baffle step?
On my sims it did appear lower, but I will redo one to check.
Individuals, smoothed a lot to keep it readable.
Woofers:
Pretty stable, dip moves around 40Hz depending of the distance, I will leave it there.
dips at 100Hz increases with distance, I might EQ this one a bit more
Otherwise good above 150Hz.
Mids:
Baffle step?
Also a minor reverse of the fr at 700Hz, but this must come from the driver (see spec below from PHL).
And the "fractioning" starts around 1600Hz, I should tame it.
At the end the high pass slope looks more like a 12db, maybe a BW12 or 18 with the typical strong corner would help.
It already has a natural 12db slope in this box so here it's only LR12 in the dsp.
Horns:
(red one had the wrong mic cal file)
Pretty good to me
They go higher than I thought
The 3 meters has too low resolution with 1.3ms here (remember it's not a tall speaker, 85cm for the horn, 85cm for the mic)
Next, thinking about outdoor rig:
What kind of gating do you think I should target? The main constrain is the speaker-mic distance.
Apparently the wave needs this distance to fully form, well maybe it could be a little less but not much.
That has a biggest impact on the first reflection calculation.
I have few walls around my salads in the garden that I could maybe leverage 😛
They are "perimeter" walls with on one side the ground at 1m, and 3 or more meters on the other side (and few trees).
It would be safe to place the speaker on top on a platform.
But then it will not be free air, more like a mix of free and 2pi since the wall will still be below the speaker.
Kind of like (S for speaker, M for mic, . for soil, | for wall, — for ground):
S M
———|
………|
………|
………|—————
What do you think? Is the more impactful the ground effect or the wall effect in this case?
I could also try to tame the first reflection with a bunch of fiberglass packs, mastress, branches, well everything I can find, on the wall and on the ground.
Other option is to rent something like this:
Cheers!
Did some more measurements yesterday, at 1, 2 and 3 meters on axis.
3m being close to the MLP, just a little off since I "toe-in" the speakers a bit.
It's very interesting, I mean to see the wave taking its form, and the room/and box gradually making their thing.
Only the horns are gated accordingly to distance since resolution is just too low even for the mids to gate (less than 2ms for horns, 50 or 500 for the rest), and Left side only, no eq on woofer and mids.
So here, a gif for the summing evolution:
- bad on woofer-mid at 1 and 2m, kind of ok at 3m but could be better
I think the room interactions masked what's going on at 250Hz on my previous measurements and I did a poor job.
While at a few cm of each drivers maybe 10cm since I kept the front grill:
Overall frequency changes:
- funny to see the lows keeping their energy while highs gradually descend.
Also it descends more between 1 and 2 meters than between 2 and 3 m.
- There's a dip building up around 300-400Hz on the mids, I assume the baffle step?
On my sims it did appear lower, but I will redo one to check.
- Plus probably a not good enough XO, + room interaction.
- The dip near 40Hz is corner related, can't do much here (other than comdemning 3 doors with bass traps 😛)
Individuals, smoothed a lot to keep it readable.
Woofers:
Pretty stable, dip moves around 40Hz depending of the distance, I will leave it there.
dips at 100Hz increases with distance, I might EQ this one a bit more
Otherwise good above 150Hz.
Mids:
Baffle step?
Also a minor reverse of the fr at 700Hz, but this must come from the driver (see spec below from PHL).
And the "fractioning" starts around 1600Hz, I should tame it.
At the end the high pass slope looks more like a 12db, maybe a BW12 or 18 with the typical strong corner would help.
It already has a natural 12db slope in this box so here it's only LR12 in the dsp.
Horns:
(red one had the wrong mic cal file)
Pretty good to me
They go higher than I thought
The 3 meters has too low resolution with 1.3ms here (remember it's not a tall speaker, 85cm for the horn, 85cm for the mic)
Next, thinking about outdoor rig:
What kind of gating do you think I should target? The main constrain is the speaker-mic distance.
Apparently the wave needs this distance to fully form, well maybe it could be a little less but not much.
That has a biggest impact on the first reflection calculation.
- 30ms would be good, it would cover the woofers with good enough resolution, but that means 6.5 meters high for the speaker stand haha 😛
- or just 15-20ms, not good for the woofers but ok for the mids, that means a rig at least 4m high 😛
I have few walls around my salads in the garden that I could maybe leverage 😛
They are "perimeter" walls with on one side the ground at 1m, and 3 or more meters on the other side (and few trees).
It would be safe to place the speaker on top on a platform.
But then it will not be free air, more like a mix of free and 2pi since the wall will still be below the speaker.
Kind of like (S for speaker, M for mic, . for soil, | for wall, — for ground):
S M
———|
………|
………|
………|—————
What do you think? Is the more impactful the ground effect or the wall effect in this case?
I could also try to tame the first reflection with a bunch of fiberglass packs, mastress, branches, well everything I can find, on the wall and on the ground.
Other option is to rent something like this:
Cheers!
I get clean 14ms of gate time which provides very good resolution down to about 70Hz. There is no point going bellow that since even the simplest box calculator software simulate <100Hz with an accuracy of about 0.5dB
What i do is, measure everything with 14ms window (3m height for mic and sound source is enough for that, about 1.2m distance). Then i simulate bass response for woofers. I do the splicing and merging of measured woofer response with the sim between 100Hz-120Hz.
There is no standing wave resonance at 70Hz that you can measure (too small of a cabinet for that. You get the whole shebang about baffle step gain and the frequency resolution is fenomenal.
Since i never made anything as large as 4350, rule of thumb is that mic measurement distance shouldn't be less than the largest dimension of the cabinet (diagonal length of your parallelepiped) to be able to get to far field for that loudspeaker.
What i do is, measure everything with 14ms window (3m height for mic and sound source is enough for that, about 1.2m distance). Then i simulate bass response for woofers. I do the splicing and merging of measured woofer response with the sim between 100Hz-120Hz.
There is no standing wave resonance at 70Hz that you can measure (too small of a cabinet for that. You get the whole shebang about baffle step gain and the frequency resolution is fenomenal.
Since i never made anything as large as 4350, rule of thumb is that mic measurement distance shouldn't be less than the largest dimension of the cabinet (diagonal length of your parallelepiped) to be able to get to far field for that loudspeaker.
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Great to hear real world feedback about the gate time.
Though you’re right due to the size constrains, I will either have to accept a lower resolution or a higher setup.
I’ve read about the mic distance from baffle for bigger boxes, read about 3 times the cone diameter (so 2x15"+ a few) or 3 times the baffles (so 3m) or 3 times the diagonale (3.6m).
Just too much there, but based on my inside measurement the wave seems to be forming its final shape between 2 and 3 meters, so maybe I could target 250cm.
This would need a speaker at 290cm high (woofer cone at 320cm) , horn and mic at 370cm.
Though you’re right due to the size constrains, I will either have to accept a lower resolution or a higher setup.
I’ve read about the mic distance from baffle for bigger boxes, read about 3 times the cone diameter (so 2x15"+ a few) or 3 times the baffles (so 3m) or 3 times the diagonale (3.6m).
Just too much there, but based on my inside measurement the wave seems to be forming its final shape between 2 and 3 meters, so maybe I could target 250cm.
This would need a speaker at 290cm high (woofer cone at 320cm) , horn and mic at 370cm.
Another option would be to use this corner outside where the house is unfinished:
I have an easier access to the "roof" from the other side, I could place the speaker there on the corner edge facing out on the diagonale.
So both walls below would have less impact, as I imagine some part of the waves to be partially directed out of the mic.
And the ground has a big slope at its feet so I can easily get 5m high for a 3m speaker-mic distance.
Numbers add up for around 14ms.
I forgot. For such a heavy box you do not make turntable. You move the mic in 10deg increments. Much easier and safer.
There are mobile scaffold platforms priced at about 400€ here that can serve for measurements and can be easily sold afterwards. Guessing that you can find it even cheaper in France.
https://www.alatshop.rs/pictures/proizvod/2020/KRAUSE_916174_957.jpg
There are mobile scaffold platforms priced at about 400€ here that can serve for measurements and can be easily sold afterwards. Guessing that you can find it even cheaper in France.
https://www.alatshop.rs/pictures/proizvod/2020/KRAUSE_916174_957.jpg
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Just a thought, and quick comment as I was wrong, again:
- First the decrease in spl is correct, I mean if 1m is the reference here, we have -6db at 2m and -9db at 3m, for some reason I had -6db per meter in mind but it’s -6db per doubling of the distance.
- Then, if normalized and levelled we get this:
Then I surfed a bit to find more infos about the setup in general:
https://www.prosoundtraining.com/2015/03/06/tall-microphone-stands-system-tuning/
About near/free field, makes a lot of sense, the transition is mostly related to the wavelengths targeted:
https://community.sw.siemens.com/s/...ee-versus-diffuse-field-near-versus-far-field
So,
A scaffolder would be good as it is solid, stable and reusable for home stuff, but I would still have the issue of placing the box on top.
Doable with help but then it becomes the risky part, hauling it up by hand or with a winch doesn’t look that easy.
And placing the mic on the right spot for each increment would need some thinking too.
There’s probably easy way with the help of rope for the distance, a level or even maybe a compass app for the angle, still gives quite some marge for errors at 4-5 meters high.
I found this at 400 eur:
I also looked at the pro audio scene stuff, of course a lot of solutions there like struss crank etc but they clearly are epxensive, like around 1000 eur, didn’t find one for rent yet.
But I will still look locally, since the rave season is starting soon maybe I can ask young guys around 😛
A bucket truck, even a small one, also has some advantages.
Could be placed anywhere with ease and has a much longer reach, and no issue on stability.
But still the problem of loading the speaker at first, and then the bucket will need some modifications.
It’s not that expensive to rent but still on the high side, around 2-300 eur a day.
I kind of go back to this one, a manual vertical hoist.
It looks sturdy enough, can go up 5m, easy loading, and cheaper, 100 eur per day rented.
It would need some care for a flat ground preparation but is light enough to be moved by hand, even solo.
Plus since there’s no bucket, a simple wood rotative platform can easily be adapted.
Rotation axis being on baffle or even center of the box depending of the weight distribution allowed.
I did some calculations and it seems the difference would be negligible, like 1or 2 degree variation that could be adjusted.
Then the mic could be still, easier here too.
That’s fun, I love this part as much as the rest 😛
I think you might have a problem with the woofer - horn crossover point.
There seems to strong cancellation at 300 hertz. This possible a phase shift in the 200 hertz crossover. With 2nd order Linkwitz slopes the electrical phase needs to be reversed.
That is the difference is the Z axis of the woofer and the horn driver?
There seems to strong cancellation at 300 hertz. This possible a phase shift in the 200 hertz crossover. With 2nd order Linkwitz slopes the electrical phase needs to be reversed.
That is the difference is the Z axis of the woofer and the horn driver?
Yes there’s definitely something going on there, you meant woofer-mid right?
I just realized that I uploaded the wrong file for the summation, is the animated gif:
So this is 1,2 and 3 meter measurements, on axis, 30cm off the MLP for the 3m.
We can see summation going from very bad to just ok at 3m.
But for sure it can be better.
It is all LR24 there, I just can't do better summation right now, really need outdoor measurements I think.
At 250hz I’m not sure if it’s a phase issue, a room issue, or a baffle step issue, or all of course.
The baffle step should be well below 200Hz but I was confused by the different responses I got from several online calculators.
It looks like they don't always include the vertical placement on the baffle.
Mid to horn ctc about 28cm
I just realized that I uploaded the wrong file for the summation, is the animated gif:
So this is 1,2 and 3 meter measurements, on axis, 30cm off the MLP for the 3m.
We can see summation going from very bad to just ok at 3m.
But for sure it can be better.
It is all LR24 there, I just can't do better summation right now, really need outdoor measurements I think.
At 250hz I’m not sure if it’s a phase issue, a room issue, or a baffle step issue, or all of course.
The baffle step should be well below 200Hz but I was confused by the different responses I got from several online calculators.
It looks like they don't always include the vertical placement on the baffle.
Woofers to mid ctc about 35cm
Mid to horn ctc about 28cm