just to clarify the intent of this comment in the previous post was for drivers, not vents.
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I still feel the Purifi 6.5 plus some form of AMT would be appropriate 350 watts and virtually indestructible. But what about using it in a sort of 2 way line source an example of what I mean is in this link but without the side woofers Fein Audio V3 | Der Konzertlautsprecher ist ein hochauflosender Linienstrahler mit Impuls-Kompensation, beeindruckend tiefen Bassen, kristallklaren Mitten, brillanten Hohen und hochster Dynamik. imagine the punch and clarity an active beast like that could achieve 120 db easy . I think a Purify 2 way line source would be an amazing project indeed i am leaning in this direction for my build assuming the bulk buy discounts apply this could be a knockout project
12LTA is kind of compressed -sounding IIRC The coil has a physical overhang of 0.08 inches and a top plate height of 0.375". Its also compromised by a somewhat weak motor . Another pound of magnet probably would help. I have an Eminence 12" coax with similar overhang but an 80 ounce magnet which sounds better overall.
Xmax these days is often described as:
(Lc - Hg)/2 + 1/4(Hg) = x-max (70% Bl) (Eminence says "3.54mm Xmax")
I mentioned the Karlson enclosure as the original 15 inch model (in its useful range} can deliver more punch than a reflex or front loaded horn of its bulk and in my limited 2-tone testing using 32Hz + 160Hz, K15 had 10dB less sidebands than a similar tuned reflex box.
Here''s a 12LTA in my Karlsonator 12. I'd imagine a "Pensil" style MLTL might be pretty good.
YouTube
Xmax these days is often described as:
(Lc - Hg)/2 + 1/4(Hg) = x-max (70% Bl) (Eminence says "3.54mm Xmax")
I mentioned the Karlson enclosure as the original 15 inch model (in its useful range} can deliver more punch than a reflex or front loaded horn of its bulk and in my limited 2-tone testing using 32Hz + 160Hz, K15 had 10dB less sidebands than a similar tuned reflex box.
Here''s a 12LTA in my Karlsonator 12. I'd imagine a "Pensil" style MLTL might be pretty good.
YouTube
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These tweeters came from pairs of ESS tower speakers. They also had a bookshelf model. ALL of these particular speakers used the MONOPOLE version of my tweeter. ALL of these were ESS 10" woofers. The replacements sell for only $119. I figured I could upgrade to better 10" woofers, or any size. But now it seems what ESS did is impossible? Guess I should just buy their impossible replacement woofers, lol.
If were just not so ignorant.
If were just not so ignorant.
These are from the 70s, right? I know the 12" version had the crossover set around 1200hz or maybe lower. Are you sure the crossover for 10" was set up at 3000hz ?
ESS clearly states much lower xo frequencies, so everything is alright with this approach. One can experiment breaking rules of good diy design practice and possibly find one's own peace of mind. Personally, I would use an 8" midwoofer like Peerless Nomex 830 869 costing 80 bucks at Meniscus which is a better performer than ESS 10" woofer anyway and cross over at about 2kHz.
Flaxxer.
Are these the larger heils? How about a picture? ESS had xo's around 800hz in the 70's for most of their amt equipped speakers. While I agree that pushing them that low isn't optimal, a guy can push them down to 1-2khz (and a bit lower, 1120hz max IMO) which opens up a whole bunch of woofer options.
When they are pushed lower, the diaphragm imparts a "reed like" sound that I find objectionable with vocals. In the range of 1.2khz they perform fine. Don't let the "tinny" output fool you. They blend very well with the right midwoofer. Even a 15" can work, a 12" should be a lock. You'd need some eq below 3khz so they can provide a bit of color to the woofers' upper range at the xo and then the blend is seamless, providing the woofers' 90 degree directivity is utilized. This, of course depends on which amt you're working with. The larger one has 90 degree dispersion as does a smaller version they offered. So, let us see what you're working with.
Are these the larger heils? How about a picture? ESS had xo's around 800hz in the 70's for most of their amt equipped speakers. While I agree that pushing them that low isn't optimal, a guy can push them down to 1-2khz (and a bit lower, 1120hz max IMO) which opens up a whole bunch of woofer options.
When they are pushed lower, the diaphragm imparts a "reed like" sound that I find objectionable with vocals. In the range of 1.2khz they perform fine. Don't let the "tinny" output fool you. They blend very well with the right midwoofer. Even a 15" can work, a 12" should be a lock. You'd need some eq below 3khz so they can provide a bit of color to the woofers' upper range at the xo and then the blend is seamless, providing the woofers' 90 degree directivity is utilized. This, of course depends on which amt you're working with. The larger one has 90 degree dispersion as does a smaller version they offered. So, let us see what you're working with.
Who knows. First one I saw was at a friends and it looked like a small tea cup. Could not believe the detail. This was in the 70's. That one was dipole. Hope Flaxxer can muster a pic.
We have a storm blowing. So the internet is not friendly with uploading photos right now. But I can easily clarify. Heil made several AMTs in the 70s. ONLY ONE WAS ROUND. And it was monopole only. The BIG dipoles can cross as low as 800 and be fine. The smaller round amt likes 2500hz and up. But at abt 3000 to 3200, it will play louder than any other tweeter I have ever heard, and still sound good at those levels.
Here is why I want to use it this way ... I have owned a pair of Carreras for two weeks. I have read everywhere the Hiquophon tweeters in them, resolve cymbals better than any other tweeter, and have a way of floating the instruments space space.... and my round Heils best them handily in these regards. I've owned the very best tweeters, implemented in the very best designs, and the Heils sound more realistic to this musician than any other I have ever heard.
I like two ways, because I own 15" Kappalites which RULE down to 35hz in my room.
Now you know why I want to use the Heils in this way. Thanks
Here is why I want to use it this way ... I have owned a pair of Carreras for two weeks. I have read everywhere the Hiquophon tweeters in them, resolve cymbals better than any other tweeter, and have a way of floating the instruments space space.... and my round Heils best them handily in these regards. I've owned the very best tweeters, implemented in the very best designs, and the Heils sound more realistic to this musician than any other I have ever heard.
I like two ways, because I own 15" Kappalites which RULE down to 35hz in my room.
Now you know why I want to use the Heils in this way. Thanks
A tweeter that can only be used from 3k is not suitable for a 2way IMO.
3ways or subwoofer(s) at a stretch.
3ways or subwoofer(s) at a stretch.
Flaxxer, sounds like you own the "power ring".
A real good 10" or an 8" along with your Kappalite's would be the ticket. I'd still consider a 4-5" backloaded horn if you're set on a 2 way. My 2 cents.
A real good 10" or an 8" along with your Kappalite's would be the ticket. I'd still consider a 4-5" backloaded horn if you're set on a 2 way. My 2 cents.
I'd go with this combo...A Celestion Pulse 15 woofer , a Selenium D250 one inch compression driver...a closeout 22 1/2 inch by 10 inch horn which can run down to 500 hertz...Parts-express.com
By studying the response curves, a 750 or so crossover avoids the "shout" of the big fifteen incher. Use your existing tweeter to pick up the top at about 5K. Do up the SIMS & you get down to the bottom just fine.
-----------------------------------------------------------------Rick.........
By studying the response curves, a 750 or so crossover avoids the "shout" of the big fifteen incher. Use your existing tweeter to pick up the top at about 5K. Do up the SIMS & you get down to the bottom just fine.
-----------------------------------------------------------------Rick.........
The only speaker that can be used for this that i know is the Fane 15-300TC, and that won't give a heavy bass as the Xmax is limited to 3.5mm. Asking a strong slamming bass and extention to 3KHz is indeed asking for a unicorn.
A Faital Pro 15HF500 comes close, but will need a higher (4th) order cr a bit below (arround 2500-2800hz) to work in this config.
Better go for a 3way or crossover the Heil lower like most do.
A Faital Pro 15HF500 comes close, but will need a higher (4th) order cr a bit below (arround 2500-2800hz) to work in this config.
Better go for a 3way or crossover the Heil lower like most do.