I have just acquired a pair of Electrovoice EVM-15 and associated XOs and "brandX" compression drivers with horns (approx 9"X2") in large floor wedge monitors. I would like to put them into a more WAF enclosure. Any opinions/suggestions on how these might work in a lounge room hifi application. Would they be better in ported or sealed box or maybe open baffle? Are evm-15L similar in spec to other pro-audio drivers so that I might adapt known designs for these drivers?
Thiele-Small parameters for the EV as follows.
Fs: 43Hz
Qes: .250
Qms: 4.96
Qts: .238
Vas: .245 m3
n0: 6.2%
Vd: 17.2 in3 (282.2 cm3)
Sd: 132.6 in2 (855.3 cm3)
Xmax: .13 in (3.3mm)
Pe: 200W
Re: 5.2 ohms
Thiele-Small parameters for the EV as follows.
Fs: 43Hz
Qes: .250
Qms: 4.96
Qts: .238
Vas: .245 m3
n0: 6.2%
Vd: 17.2 in3 (282.2 cm3)
Sd: 132.6 in2 (855.3 cm3)
Xmax: .13 in (3.3mm)
Pe: 200W
Re: 5.2 ohms
I forgot to ask. Just how small a sealed box can I use for the EVM-15L if I am not too concerned about going very loud.
Ozzi
Ozzi
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There's a published front horn for the EVM 15. There's a wide range of what passes WAF... the FH sure wouldn't pass it in my living room, but it looks awesome.
I guess what I mean by high WAF is a tallish rectangular enclosure with, maybe, a curved front to look more "sculptural", as small as possible in volume or at least in the front dimensions. Of course nice oiled satin or gloss veneered surfaces are assumed and drivers should not be obvious to the casual observer, but hidden behind an attractive cat-proof screen ;-)
Hi,
They are far more suited to their current purpose than domestic hifi.
For domestic they only make sense for low powered amplifiers, to get any
real bass you would need large ported enclosures, sealed will have no bass.
For big I prefer cuft (28L). Vas is near 9 cuft, Qts 0.24, Fs 43Hz.
You can go as low as ~ 33L for sealed, but again there will be no bass.
3 cuft tuned to 45Hz looks a lot better (and is a lot bigger).
For the sizes you can get far more bass albeit at lower sensitivity using
drivers intended for domestic / studios, so only realy suited to flea power.
/Sreten.
They are far more suited to their current purpose than domestic hifi.
For domestic they only make sense for low powered amplifiers, to get any
real bass you would need large ported enclosures, sealed will have no bass.
For big I prefer cuft (28L). Vas is near 9 cuft, Qts 0.24, Fs 43Hz.
You can go as low as ~ 33L for sealed, but again there will be no bass.
3 cuft tuned to 45Hz looks a lot better (and is a lot bigger).
For the sizes you can get far more bass albeit at lower sensitivity using
drivers intended for domestic / studios, so only realy suited to flea power.
/Sreten.
I believe the EV15 inch wide horn was used by jbl and klipsch - it was called a t35 or t350 if I recall. I have one of these and a 3X5 horn and a 12 woofer in a monstrousity of a cabinet.
Cool.
Srinath.
Cool.
Srinath.
Depending on the amplifier, would applying a Linkwitz Transform (or other bass eq) be an idea for a small, sealed cab? It was said that SPL isn't an issue.
15" woofer plus horn
The 15" woofer plus piezo horn is a popular format in packaged multi-way speakers. The Peavey SP2 goes down to 43 hz with an apparently sealed box, best bass speaker I've ever owned. Crossover is 1200 Hz. See the following post in multi-way that everybody found uninteresting. http://www.diyaudio.com/forums/multi-way/170702-2-way-woofer-horn-pa-who-first.html
The 15" woofer plus piezo horn is a popular format in packaged multi-way speakers. The Peavey SP2 goes down to 43 hz with an apparently sealed box, best bass speaker I've ever owned. Crossover is 1200 Hz. See the following post in multi-way that everybody found uninteresting. http://www.diyaudio.com/forums/multi-way/170702-2-way-woofer-horn-pa-who-first.html
I tried a pair of these drivers in Klipsch Lascalas.
The cab resonance was pretty bad, many bad comments from the wife.
I played w/ the sims in horn resp, and they would sound a LOT better in front horns, about four foot long.
The wife is all for it...
What "pass for WAF" is what sounds good where I live...
15"woofer plus horn
As Sreten suggested "3 cuft tuned to 45Hz looks a lot better (and is a lot bigger)." 3cuft = 5184 cu inch so one possibility is 17"W x 36"H x 9"D (internal) built of 1" ply that ends up as 18"W x 37"H x 10"D-- still not too big. I currently have 12"W x 39"H x 6"D boxes and they are acceptable, even with exposed drivers!!
No-one has mentioned the possibility of open-baffle or aperiodic enclosure for these drivers. The *first* thought I had was something similar to the Visaton design "Nobox"
I have read that aperiodic is the way to go for smaller boxes - any comments?
As Sreten suggested "3 cuft tuned to 45Hz looks a lot better (and is a lot bigger)." 3cuft = 5184 cu inch so one possibility is 17"W x 36"H x 9"D (internal) built of 1" ply that ends up as 18"W x 37"H x 10"D-- still not too big. I currently have 12"W x 39"H x 6"D boxes and they are acceptable, even with exposed drivers!!
No-one has mentioned the possibility of open-baffle or aperiodic enclosure for these drivers. The *first* thought I had was something similar to the Visaton design "Nobox"
I have read that aperiodic is the way to go for smaller boxes - any comments?
It still leaks...
LDSG Appendix A - Enclosures
I maintain that sealed with bass eq would be the way to go. That could all change if we knew which amplifier would be driving them.
LDSG Appendix A - Enclosures
I maintain that sealed with bass eq would be the way to go. That could all change if we knew which amplifier would be driving them.
15" + horn
Re: Chris661 inquiry. I have a choice of amps. from a 10W per channel PP tube amp, 70's Luxman SS 15W ClassA (then ClassAB up to 63Wpc), similar Luxman SS 30W pc, a couple of chip amps (15W pc) maybe a ~100W pc SS amp (2N3055s in output stage) homebuilt, plus a couple of old 70s receivers that sound OK--probably 50-60W pc. (Yes I am a packrat ;-)
I also have a reasonable quality graphic equalizer 32Hz-20KHz for experiments.
I will check out LDSG Appendix A - Enclosures.
Re: Chris661 inquiry. I have a choice of amps. from a 10W per channel PP tube amp, 70's Luxman SS 15W ClassA (then ClassAB up to 63Wpc), similar Luxman SS 30W pc, a couple of chip amps (15W pc) maybe a ~100W pc SS amp (2N3055s in output stage) homebuilt, plus a couple of old 70s receivers that sound OK--probably 50-60W pc. (Yes I am a packrat ;-)
I also have a reasonable quality graphic equalizer 32Hz-20KHz for experiments.
I will check out LDSG Appendix A - Enclosures.
EVM15L is a good driver in the original Karlson enclosure and I've had it in a small coupler. You could look for EV's old TL606 application note which IIRC (?) was a 3.2 cubic foot reflex tuned to ~fs and apply 6dB boost at ~fb. EV sold an active underdamped 2nd order highpass eq box for 6th order bass reflex purposes.
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15' + horn(s)
I finally found EV plans for TL606 enclosure (3.2 cuft). This is the one EV used to do all their freq resp measurements. Further research revealed that EV claimed best low range performance of EVM-15L in sealed or vented enclosures. Eg TL606 down to 40Hz with half port blocked. With small amount of EQ @ 40Hz they should go low enough. I can always use sub for movie special effects.
Somebody may be interested in this site for other construction plans
http://archives.telex.com/archives/EV/Builders Plans/TL606 Builders Plans.pdf
If I stretch dimensions to approx 18"W x 35"H x 12"D (same volume) then add 5" to height to fit mid horn and Fostex supertweeter I end up with 18"W x 40"H x 12"D which should look something like attached. I am thinking curved grille to give that "retro" look. Bracing and horns will take up extra volume.
Quick question. Does anyone have opinion on whether flush-mounting bass driver and horns is necessary? It seems like a good idea, but EV, Altec and JBL didn't seem to worry too much about this. I am OK with circular rebates, but rectangular one for horn is a bit tricky.
Thanks everyone for your contributions.
I finally found EV plans for TL606 enclosure (3.2 cuft). This is the one EV used to do all their freq resp measurements. Further research revealed that EV claimed best low range performance of EVM-15L in sealed or vented enclosures. Eg TL606 down to 40Hz with half port blocked. With small amount of EQ @ 40Hz they should go low enough. I can always use sub for movie special effects.
Somebody may be interested in this site for other construction plans
http://archives.telex.com/archives/EV/Builders Plans/TL606 Builders Plans.pdf
If I stretch dimensions to approx 18"W x 35"H x 12"D (same volume) then add 5" to height to fit mid horn and Fostex supertweeter I end up with 18"W x 40"H x 12"D which should look something like attached. I am thinking curved grille to give that "retro" look. Bracing and horns will take up extra volume.
Quick question. Does anyone have opinion on whether flush-mounting bass driver and horns is necessary? It seems like a good idea, but EV, Altec and JBL didn't seem to worry too much about this. I am OK with circular rebates, but rectangular one for horn is a bit tricky.
Thanks everyone for your contributions.
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