Hello,
After having built two pairs of full)-rangers (Jordan VTL and MLTL), I'd like to give a try to two-ways.
This is following a recent blootooth speaker build were I used a 8" woofer cross at 180Hz and enjoyed the punch. My full-rangers are seconded by a 12" sub which works great, but closing at 80Hz the punch in the 80-200Hz range isn't comparable.
Constraints:
I had a look at Fountek NEO CD 3.5H and was wondering with which woofer to pair them, with a reasonable budget (not more than the fountek price)... 8 et 12" can fit and the total volume is more or less 33l.
Not decided on closed or BR, maybe more closed for more punch/less volume as it will be fed by bi-amping and DSP.
Fountek idea comes from the directivity of this speaker, but maybe there are other choices.
Thx!
F.
After having built two pairs of full)-rangers (Jordan VTL and MLTL), I'd like to give a try to two-ways.
This is following a recent blootooth speaker build were I used a 8" woofer cross at 180Hz and enjoyed the punch. My full-rangers are seconded by a 12" sub which works great, but closing at 80Hz the punch in the 80-200Hz range isn't comparable.
Constraints:
- Wall mounted, max 15x35x120 (6"x 13.5" x 47")
- Due to low thickness no toe-in possible (unlike my folded VTLs which are also wall-mounted)
- High dynamics and punch
- Go looooow (there won't be any sub added unlike my other speakers)
- Best possible off-axis response (due to wall placement w/o toe-in)
I had a look at Fountek NEO CD 3.5H and was wondering with which woofer to pair them, with a reasonable budget (not more than the fountek price)... 8 et 12" can fit and the total volume is more or less 33l.
Not decided on closed or BR, maybe more closed for more punch/less volume as it will be fed by bi-amping and DSP.
Fountek idea comes from the directivity of this speaker, but maybe there are other choices.
Thx!
F.
Parts-express says foundtek new 3.5 is unavailable, but ebay has some for $164 each. Might be counterfeit, who knows? diyaudiocart.com says they are 95.5 db 1w1m pmax 12 w impedance 7 ohms response 1100-30000 hz but minimum crossover 2500 hz 12 db/octave. 4600 IRE whatever that is. India rupee?
Your box size is kind of limiting bass reponse. A 10" kappapro-10A can fit in a 10 L box sealed or 28 L vented but gets peaky from 1000 to 2000 hz and drops like a rock above 2000. See https://www.eminence.com/speakers/speaker-detail/?model=Kappa_Pro_10A for their recommended 11.1 liter box which allows the full 500 w rating 110 hz above. You can go lower with a bigger box but you have to derate the power to not blow Xmax. Kappa-pro10a is $149 + freight + tax today in the USA.
That leaves a hole from 2000 to 2500 hz. See this thread for a 73 hz to 2500 woofer in a 43 L box. Kappa12a is $120 +freight+tax in USA . https://www.diyaudio.com/community/threads/enclosure-for-eminence-kappa-12a.383202/ 12" diameter exceeds your box width.
You want measured wide directivity look at pispeakers.com 4pi. Uses a CD on a horn. Or in a big box with higher power, Peavey SP2-XT. I had some SP2-XT, had measured response -3db over 22.5 deg from centerline (45 deg dispersion) from 500 hz to 14 khz.
Your box size is kind of limiting bass reponse. A 10" kappapro-10A can fit in a 10 L box sealed or 28 L vented but gets peaky from 1000 to 2000 hz and drops like a rock above 2000. See https://www.eminence.com/speakers/speaker-detail/?model=Kappa_Pro_10A for their recommended 11.1 liter box which allows the full 500 w rating 110 hz above. You can go lower with a bigger box but you have to derate the power to not blow Xmax. Kappa-pro10a is $149 + freight + tax today in the USA.
That leaves a hole from 2000 to 2500 hz. See this thread for a 73 hz to 2500 woofer in a 43 L box. Kappa12a is $120 +freight+tax in USA . https://www.diyaudio.com/community/threads/enclosure-for-eminence-kappa-12a.383202/ 12" diameter exceeds your box width.
You want measured wide directivity look at pispeakers.com 4pi. Uses a CD on a horn. Or in a big box with higher power, Peavey SP2-XT. I had some SP2-XT, had measured response -3db over 22.5 deg from centerline (45 deg dispersion) from 500 hz to 14 khz.
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Further investigation of other 10" woofers came up with a candidate. Two B&C 10" models drop 10 db from 200 hz to 80 hz, and the third model drops 15 db. However the Eminence beta-10A only drops 5 db from 200 hz to 80 hz. Furthermore its response rises from 1 khz to 3 khz thereby covering the bandgap where the foundtek neo cd 3.5 must be protected below 2500 hz. https://www.eminence.com/speakers/speaker-detail/?model=Beta_10A
it is only a 250 W driver, but that should not be a problem matching a 7 watt tweeter. Fs 53 hz qt 0.49 vas 60.1 L so it will go either sealed or vented. Recommended sealed volume is 8.5-14 L which fits your criteria. $79 in US. Eminence recommended cabinet design is 61.1 L vented f3 59 hz vent 3" diameter 2.7" long, but that limits response to 50 watts. You could go higher in watts in a smaller sealed cabinet for f3 80 hz.
it is only a 250 W driver, but that should not be a problem matching a 7 watt tweeter. Fs 53 hz qt 0.49 vas 60.1 L so it will go either sealed or vented. Recommended sealed volume is 8.5-14 L which fits your criteria. $79 in US. Eminence recommended cabinet design is 61.1 L vented f3 59 hz vent 3" diameter 2.7" long, but that limits response to 50 watts. You could go higher in watts in a smaller sealed cabinet for f3 80 hz.
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It's worth noting that the frequency response charts are likely taken in an infinite baffle. Going ported etc would likely yield better results.
For a 2-way with decent LF output, I'd avoid a ribbon tweeter. Too fragile, too limited in extension. A really good 1" dome, or the SB65 2.5" full-ranger crossed to a reasonably meaty woofer would be where I'd start.
Chris
For a 2-way with decent LF output, I'd avoid a ribbon tweeter. Too fragile, too limited in extension. A really good 1" dome, or the SB65 2.5" full-ranger crossed to a reasonably meaty woofer would be where I'd start.
Chris