Ah, cool. Look forward to your results.
Thanks for the feedback; I'm honestly thinking of loading in the ~50 degree range until ~1500hz then branch out to 90 degree to get down to the 600 or so range (perhaps erroneously looking at it like a Keele flare). I think I'm depth limited to 24" along the wall, so about 27" along the primary axis, but that includes fitting drivers (one of the nicer things about those ribbons would be their shallow depth), so my low end loading will ultimately be packaging constrained.
Thanks for the feedback; I'm honestly thinking of loading in the ~50 degree range until ~1500hz then branch out to 90 degree to get down to the 600 or so range (perhaps erroneously looking at it like a Keele flare). I think I'm depth limited to 24" along the wall, so about 27" along the primary axis, but that includes fitting drivers (one of the nicer things about those ribbons would be their shallow depth), so my low end loading will ultimately be packaging constrained.
Yep, been using that + Hornresp (with the new functionality, it's pretty incredible) + a bit of Solidworks to see what I can fit. First entry will probably be foam board/cardboard before tooling up the heavy weaponry.
It's a great spreadsheet (plus your PDF going through the design choices), thanks for making that!
It's a great spreadsheet (plus your PDF going through the design choices), thanks for making that!
Since we are having so much luck with the SB Acoustics SB65WBAC25-4 as a mid and tweeter for the bookshelf horn thread, it probably would make a fine dedicated mid for band pass injection when used series parallel x 4. The basket is pretty compact - just needs a rear chamber. The benefit is that it can go pretty low with an fs of near 100Hz. When mounted near the throat of a synergy, I would not be surprised if you can go down to 350Hz before distortion is a problem. The other benefit is that it can go as high as you want to take it. If placed close enough to the tweeter, no reason it can't go up to 5kHz+ even (driver limited), but placement limited will depend on where the first cancellation dip is due to reflection from driver to tweeter. If a dome tweeter is used (as suggested by others and more recently by Onni in no comp driver synergy thread), the HF limit may be higher since you don't have that extra 1inch long transit from apex to comp driver diaphragm buried deep inside driver.
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Offtopic but my nabure do like it to radiate me with a radar transmitter, I did measure 71 volts/meter or 13,3 watts on 8.5 gigahertz, that is reason of al the interference on equiptent and my headage of noisy ears.
not someting to be happy about as sensitive person, and so she try to get my out of my house, she do not like me, the only reason.
tomorrow I go take staps. big ones.
regards kees
not someting to be happy about as sensitive person, and so she try to get my out of my house, she do not like me, the only reason.
tomorrow I go take staps. big ones.
regards kees
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If you think the parameters are incorrect and you have the driver, measure the driver's parameters yourself. That's the best way to do it. Honestly I would always measure the actual drivers I received to see what the actual parameters are. They will always be at least a little different from the published values due to manufacturing variation.
Original unity kit midrange
I just received the original midrange drivers from the early unity kit.
JC5RTF-B | Misco Speaker Company
I just received the original midrange drivers from the early unity kit.
JC5RTF-B | Misco Speaker Company
I know this thread is focussed on the midrange drivers of a synergy horn. But after reading (almost) all pages I'm generally wondering about the driver for the low frequency. I'm working on a 3 way synergy which needs to be a bit budget.
Celestion CDX1-1445 for hf
GRS 5SBM-8 5" for mid
And now I'm looking at this one for the low freq:
GRS 8SW-4 8"
The mid and low have 100Hz overlap... Not sure if that's a good choice...
Any suggestions?
Thanks!
Celestion CDX1-1445 for hf
GRS 5SBM-8 5" for mid
And now I'm looking at this one for the low freq:
GRS 8SW-4 8"
The mid and low have 100Hz overlap... Not sure if that's a good choice...
Any suggestions?
Thanks!
I'm still in middle of my build working out details, but here are the impressions I get from reading about synergies. YMMV
The Celestion is given a recommended crossover of 2,200 kHz, 12 dB/octave. That's pretty high for those 5" mids to hit. I think the biggest issue is getting them as close to the throat as possible, since you get a cancellation notch from the quarter wave distance from the port to the compression diaphragm. That said I'm pretty sure it can be done.
Overlap of any drivers is generally a good thing because it means you can make a more perfect crossover. You'd have to be more specific about how you're loading the drivers to show that you've actually got overlap. The problem I see with the GRS woofer is it's got a large VAS so you're gonna need large cabinets. Not a problem for home use but it's gonna be big for PA.
The Celestion is given a recommended crossover of 2,200 kHz, 12 dB/octave. That's pretty high for those 5" mids to hit. I think the biggest issue is getting them as close to the throat as possible, since you get a cancellation notch from the quarter wave distance from the port to the compression diaphragm. That said I'm pretty sure it can be done.
Overlap of any drivers is generally a good thing because it means you can make a more perfect crossover. You'd have to be more specific about how you're loading the drivers to show that you've actually got overlap. The problem I see with the GRS woofer is it's got a large VAS so you're gonna need large cabinets. Not a problem for home use but it's gonna be big for PA.
I think you might have difficulty getting a 5" mid close enough to use with the CDX1-1445. Depends on the horn it's on, though (wider angle will let a larger mid get closer to the tweeter throat). And what you're trying for in phase response -- if going for linear phase (without an FIR equalizer, that is), you'd need a very small midrange, like a 2" or so!
Due to the fact that this would be my first synergy build, I'm thinking of switching to a less difficult build. That's why I'm thinking of building something more like these:
http://www.diyaudio.com/forums/multi-way/195955-unity-horn-budget-drivers-active-x-over.html
At my school I can use a CNC mill so I'm working on a 3d model which I will produce using the mill. I think building a less complicated horn as a first timer is a good practice. (I have mostly build subs, ported, horns and tapped horns)
Jmorken is using Selenium D220Ti for HF but those aren't available so any recommendations on that?
I will probably start my own thread in the future, so I'll stop hijacking this thread!
http://www.diyaudio.com/forums/multi-way/195955-unity-horn-budget-drivers-active-x-over.html
At my school I can use a CNC mill so I'm working on a 3d model which I will produce using the mill. I think building a less complicated horn as a first timer is a good practice. (I have mostly build subs, ported, horns and tapped horns)
Jmorken is using Selenium D220Ti for HF but those aren't available so any recommendations on that?
I will probably start my own thread in the future, so I'll stop hijacking this thread!
Downloaded and updated to the latest version of Hornresp but can't seem to bring up the Ap1/Lpt combo, no matter how many times I double click.
Oddly, I can only get these two sets of combinations, Ap1/LP and Ap/Lpt.
What am I missing?
Oddly, I can only get these two sets of combinations, Ap1/LP and Ap/Lpt.
What am I missing?
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A few other conflicting pieces of info (IMHO) that I struggle a bit with:
and
First, I thought it was the local flare rate and not the cross-sectional area that determined at which frequency the horn stops loading the CD?
Second, I thought we are supposed to tap the mids in where the area is equal to or less than 64.91cm2?
IOW, like this:
... keeping in mind that the mids should not go too close to the throat:
and
First, I thought it was the local flare rate and not the cross-sectional area that determined at which frequency the horn stops loading the CD?
Second, I thought we are supposed to tap the mids in where the area is equal to or less than 64.91cm2?
IOW, like this:
... keeping in mind that the mids should not go too close to the throat:
Re-read the Synergy patent. There is no conflict in what I wrote. There are several hings that should occur to make a synergy horn work a described in the patent. However, if you run all the math on actual synergy horns, they don't meet all the "requirements" stated in the patent.
Hi InOtIn,
A slight change was made to the port label names some time ago. The current names are as given in the Help file:
Ap - Vented rear chamber port cross-sectional area (sq cm).
Lpt - Vented rear chamber port tube length (cm).
Ap1 - Throat port or throat adaptor entry cross-sectional area (sq cm).
Lp - Throat chamber port or throat adaptor length (cm).
Kind regards,
David
Thanks for replying and apologies if I'm being a bit thick - but I have read the patent a few times, as well as this and other synergy threads, and from what I've taken away so far is that the first of these statements, in relation to mid port location, is in accordance with the patent while the second statement seems to say the exact opposite of the first, no?
I'm a bit late to the Synergy game but I'm excited to dive straight in and get my feet wet - just need to get my facts straight first, so please bear with me while I'm trying to do so.
