Howdy all! Just wanted to see what other folks might be doing with d220ti compression drivers. I have them on Dayton 10" round waveguides for the moment, but I'm curious to know what waveguides people have tried with them, and how low they can be pushed, assuming active crossovers and fairly steep slopes.
So, how low do we think they can go safely?
So, how low do we think they can go safely?
http://www.jblpro.com/ProductAttachments/D220TI_SpecSheet.pdf
I use them as replacements in PA systems.
I use them as replacements in PA systems.
Thanks Jon! I do have that already, though...they stuff a folded version into every box 🙂
Reading through here, it would seem this question has already been gone over.
http://www.diyaudio.com/forums/multi-way/148087-econowave-tweeter-woofer.html
Reading through here, it would seem this question has already been gone over.
http://www.diyaudio.com/forums/multi-way/148087-econowave-tweeter-woofer.html
have been using 1.3khz LR12 on this waveguide for years, works pretty good.
preferably active so you can switch to 24db at loud volumes just in case.
Pyle PH612 1" Screw-On Constant Radiation Horn 1-3/8"- 18 TPI
some polars
http://www.stereo.net.au/forums/ind...-friendly-dynamic-speaker/page-10#entry514222
preferably active so you can switch to 24db at loud volumes just in case.
Pyle PH612 1" Screw-On Constant Radiation Horn 1-3/8"- 18 TPI
some polars
http://www.stereo.net.au/forums/ind...-friendly-dynamic-speaker/page-10#entry514222
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It's pretty much a standard econowave then, I guess?
I'm angling to see if anyone's done a successful design with a 15"+that tweeter with an "as yet un-named" waveguide.
Right now I'm thinking that's going to lead to a hole in directivity, because I can't push that tweeter low enough on a big enough waveguide..I'm hoping that I'm wrong.
would rather have a small narrowing directivity and a woofer that can handle the upper mids than a strained titanium diaphragm. b&c de250 would go lower i believe.
I've heard them on Altec 811 horn crossed 3rd order at about 1200Hz. Sounded just fine.
Seems unlikely they could be crossed much lower with good results.
Seems unlikely they could be crossed much lower with good results.
I use the same phragm (but I coated mine with PVA and talc to damp the ringing, which worked GREAT) in the D2500Ti, at 1300hz. 2nd order electric filter it's never had an issue
1650Hz active crossed LR4 sounds best in my cheap plastic tractrix horns.
@Koifarm, the alphas are crossed the same (1270 18db)?
@Koifarm, the alphas are crossed the same (1270 18db)?
Thanks fellas.
Essentially what I'm trying to do is figure out if I can make a semi-clone of the JBL 3677, but with a different waveguide, something kinda half-way between a 4pi Four and Econowave, but using a 15" driver.
From the looks of it, I'm going to need different hf units.
Essentially what I'm trying to do is figure out if I can make a semi-clone of the JBL 3677, but with a different waveguide, something kinda half-way between a 4pi Four and Econowave, but using a 15" driver.
From the looks of it, I'm going to need different hf units.
No, they are crossed at 950 Hz with 12db.
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I used the selenium also as low as 800Hz with 24db cutoff.
Why not rebuild with original JBL units. like my rebuild JBL cabaret from the late 70's.
Why not rebuild with original JBL units. like my rebuild JBL cabaret from the late 70's.
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I purchased the emerald physics cs3 and that tweeter is crossed at 900hz 3rd order in the eminence coaxial 12" driver.
seems to do just fine.
I was suprised it could, I'm going to tri-amp these speakers soon and take measuments.
the passive x-over looks like a real mess in these speakers.
I'll post a photo, hold on.......
seems to do just fine.
I was suprised it could, I'm going to tri-amp these speakers soon and take measuments.
the passive x-over looks like a real mess in these speakers.
I'll post a photo, hold on.......
wow. 900hz in a coax? imagin the polars on that one. even a 10-12" waveguide would have problems that low.
wouldnt take much to break the selenium driver either.
wouldnt take much to break the selenium driver either.
Both the compression driver and the woofer will have a beamwidth of about 120 degrees at the frequency. However, the tweeter has no radiation to the rear while the woofer has, which can sound weird. Power handling is not a concern as these are hi-fi loudspeakers, limited in SPL by the dipole woofers.
what? a coax has a hard time support anything much lower than 2k. wild on-axis spl variation is guaranteed, polars will be nasty and wont match with the woofer in a million years.
power handling is definitly a concern, iv broken 3 pairs of d220 diaphragms with steeper slopes than this.
power handling is definitly a concern, iv broken 3 pairs of d220 diaphragms with steeper slopes than this.
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