I've been using vcad since the beginning of the build and before that. Doesn't seem like it's particularly needed when one is using active filters and RTA. I am using it for passive xover design.
I have the mdats of the d27, dx25, and nd25fw on this baffle and there is really contest, the nd25fw is considerably more stable in it's on axis dispersion. In practice it sounds much better as well. Vcad shows good dispersion match with the mid with the nd25, and a poor match with the other tweeters.
I have the mdats of the d27, dx25, and nd25fw on this baffle and there is really contest, the nd25fw is considerably more stable in it's on axis dispersion. In practice it sounds much better as well. Vcad shows good dispersion match with the mid with the nd25, and a poor match with the other tweeters.
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If you are going passive with the ND25FW, keep an eye on the tweeter resonance (1,350Hz) causing problems in the pass band to the midrange. If you are crossing at 3KHz (and 4th order acoustic) you might be ok. Otherwise you may need resonance peak compensation on the tweeter.
Chasing "perfection" is a real rabbit hole; I've never tried.
I took the advice of a good mate and better speaker builder than I will ever be and started to simply listen to the music and not the noise.
Sometimes near enough is good enough.
I took the advice of a good mate and better speaker builder than I will ever be and started to simply listen to the music and not the noise.
Sometimes near enough is good enough.
Not sure I'd argue that this is chasing perfection, just chasing good driver integration and learning what I can to get to there. At the moment I have no complaints with the sound of the speakers. My current goal is to learn what I need to so I can potentially develop a passive crossover for the speakers, but active is easier and I may end up sticking with that. PC noise is a problem but solved easily. I feel my recent changes to the speakers have them at a point where my expectations are met.
I'm finding the midrange detail to be superb to the point that my other speakers are leaving me quite disappointed there. Might have to donate Amiga's to a family member and work on a smaller three way. There's a lot that my smaller speakers are simply not rendering
I do need to make some stands for them, gonna have to be hefty to keep this weight stable.
I'm finding the midrange detail to be superb to the point that my other speakers are leaving me quite disappointed there. Might have to donate Amiga's to a family member and work on a smaller three way. There's a lot that my smaller speakers are simply not rendering
I do need to make some stands for them, gonna have to be hefty to keep this weight stable.
Did you end up resolving the 200Hz resonance?
I was wondering if you'd tried switching rooms. And doing a sine wave test at 200Hz and either side to confirm the troublesome frequency
I was wondering if you'd tried switching rooms. And doing a sine wave test at 200Hz and either side to confirm the troublesome frequency
Crossing the mid at 2,5kHz, hmmm. That cone isn't really holding out above 3k. Your own measurement shows this burst decay:
Did you post your VCAD file? I might have missed it.
Switching rooms is hard, requires me to move the speakers, desktop computer, and three amps so I haven't done that yet. I do have the woofer volume much lower than I did before so that could be part of it. We'll see what happens when I port the new port in and try some experiments with them. I've run sine wave plenty of times, it doesn't reveal anything to my ears, volume stays pretty much constant across the sweep.
I don't think I can move these into another room, that requires moving a desktop, three amps, cabling, and the speakers, only to move it all back.
All the kerfuffle has made a few marks on the baffle but that's nothing a quick spray of paint can't fix.
I don't think I can move these into another room, that requires moving a desktop, three amps, cabling, and the speakers, only to move it all back.
All the kerfuffle has made a few marks on the baffle but that's nothing a quick spray of paint can't fix.
👍
Very valid reason.
Active as it's pro and con. Passive too. If you can achieve a nice passive filter then do it, it's nice to have. Dsp functions can help to define and compare possible answers at fly of a switch which... is fast and convenient... then when happy, match the curve with passive components.
If you go to the hassle to have multiple amps setup, then why not try something only digital can do too? Fir with steep slope, time alignement,... even 'room compensation'. Price to pay is latency, which can be an issue if you mix on them or monitor real time events, and it can be a rabbit hole with measurements...
Both options can be nice.
Yeah, 3 ways bring another rendering than 2 ways (especially) with small drivers. But don't discard them (if you planned it), you'll regret at one point or another...
It usually take a bit of time to be used to threeway when people are used to 6,5"+1" (at least i observed a few time with fellows mixing on mine).
Anyway there is no replacement for SD and acoustic impedance. The more membrane, the more 'real' bass and low mids sound imho.
You talked about stand: you'll very probably need to tweak bsc once done.
I had with mine.
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Eh I never really cared for the sound of these Amiga speakers. I wouldn't miss them.
Quick sweep for distortion, this was done extremely loud, probably about as loud as I'll ever take it so you'll have to ignore the dB scale. I had to wear headphones for this one. Seems like the tweeter doesn't care.
Man it does seem like my room just kinda rings out around the 200hz region. You can just hear it kinda bounce around the room like a ping pong ball almost. Will probably have to live with it and try to EQ a bit.
Man it does seem like my room just kinda rings out around the 200hz region. You can just hear it kinda bounce around the room like a ping pong ball almost. Will probably have to live with it and try to EQ a bit.
jbl 590 reviewed at asr today, shows similar resonance problems in impedance and port.
still kinda hard to tell where it's coming from.
still kinda hard to tell where it's coming from.
It's been nearly 20 pages and I can't remember... Does plugging the port help with the resonance but kill the sub-bass response?
no change at all in impedence or sound other than reduced bass to the supposed resonance when port plugging.
Do you think it’s speaker related or room related? You have this dip at 160Hz in your far field measurements but not in your near field measurements eh?
If you have ‘normal room’ ie around 2.4 meter in height and height of bass around 50 cm from floor, dip around 150 hz is expected.
There is a good dip in response in the room around the 100-200hz area. Not really related to my problems.
Had the speakers running for awhile, sounding fine overall, most issues have been figured out. I believe part of my issues with the 150hz region is that im not really used to having such sensitivity down there for mixing. I was making a lot more adjustments to that region than I was used to.
I've got some hearing issues with my left ear that ENT can't figure out, but it causes a weird imbalance that seems tough to fix. I have the left midnand tweeter set at +2db and they helped a lot with imaging. I really wish they could figure out my ear, it basically killed my live sound career because it also crackles and makes me disoriented when things get loud.
Not really much left to do on these other than get a better dsp unit and finish the cabinet. I do need to figure out my multisub placement because I feel like all the bass is along the walls and not much at listening position.
Had the speakers running for awhile, sounding fine overall, most issues have been figured out. I believe part of my issues with the 150hz region is that im not really used to having such sensitivity down there for mixing. I was making a lot more adjustments to that region than I was used to.
I've got some hearing issues with my left ear that ENT can't figure out, but it causes a weird imbalance that seems tough to fix. I have the left midnand tweeter set at +2db and they helped a lot with imaging. I really wish they could figure out my ear, it basically killed my live sound career because it also crackles and makes me disoriented when things get loud.
Not really much left to do on these other than get a better dsp unit and finish the cabinet. I do need to figure out my multisub placement because I feel like all the bass is along the walls and not much at listening position.
Does your ear crackle at random times or just when exposed to high SPL?
Any history of Eustachian tube problems? Any issues with major altitude changes?
If you've given the current ENT a decent amount of time to figure it out, a second opinion may be in order. Sometimes you just need to find a doctor that's seen your problem before.
Any history of Eustachian tube problems? Any issues with major altitude changes?
If you've given the current ENT a decent amount of time to figure it out, a second opinion may be in order. Sometimes you just need to find a doctor that's seen your problem before.