Roger I'm sorry I never saw this or replied, your project sounds super interesting. I did end up sticking with the TPA3255 based system as well as the LRS-350-24 power supply. There is no audible hiss present with this solution and plenty of power to basically go deaf before distortion sets in. I build a pretty simple little enclosure for it that sits under the Ashly. Since it's a one-purpose solution I made it as simple as possible with balanced inputs aligned with those on the back of the Ashly. Also using a McIntosh C712 preamp with balanced output so everything in the signal chain is balanced which is nice.
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zeagan, what are you using above 8kHz? The Ti phrams break up badly above there and will oil can if you push them hard.
Also having had several LS sets before, both factory and clone, I've dubious of a 50Hz response from them. The flare is too short to support it. This is why djk (vale) developed the ported version and whilst that was better, it wasn't great. My KHorns in really solid corners just did 40Hz and they're far larger.
Also having had several LS sets before, both factory and clone, I've dubious of a 50Hz response from them. The flare is too short to support it. This is why djk (vale) developed the ported version and whilst that was better, it wasn't great. My KHorns in really solid corners just did 40Hz and they're far larger.
Brett, I’ll do some in-room sweeps when I get home from both a meter out and listening position as I’m going to be re-doing the EQ, crossover and delay. Did find this photo from a year ago when I was dialing them in though. The 2445’s did fine up to around 13/14k in that horn and the bins played down to 50Hz without issue. If I recall correctly this was when I was trying to maintain that “LaScala” sound which is basically exaggerated mid bass, when I EQ’d them flat they felt boring.
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If you're happy with the 2445s up that high, great. I couldn't live with them even with Radian Al phrams.
EQ'd flat and get rid of that 10dB or so hump, and yes, they're going to sound more boring because they're going to be rolling off closer to 100Hz. I measured mine outdoors, ground plane.
EQ'd flat and get rid of that 10dB or so hump, and yes, they're going to sound more boring because they're going to be rolling off closer to 100Hz. I measured mine outdoors, ground plane.
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Hi Roger. I just went through the speaker sensitivity issue. I run a six channel Hypex amp and a dbx driverack pa2.
Jbl 2405h
Jbl 2420
Jbl 2235h
Simply put a zobel network on the compression drivers to flatten the impedance and lower sensitivity. Google zobel calculator and enter your speaker Re and Le values. It will tell you what resistors to use. You can find them at mouser, I use Caddock 8250. 10ohm 50 watt. The calculator will give you values, just find something close.
Hope that helps. The wonderful people in this forum have helped me immensely. Enjoy.
Jbl 2405h
Jbl 2420
Jbl 2235h
Simply put a zobel network on the compression drivers to flatten the impedance and lower sensitivity. Google zobel calculator and enter your speaker Re and Le values. It will tell you what resistors to use. You can find them at mouser, I use Caddock 8250. 10ohm 50 watt. The calculator will give you values, just find something close.
Hope that helps. The wonderful people in this forum have helped me immensely. Enjoy.
Just a little update to anyone that was following along to this thread from a while back, I came into possession of the newer K510 horn lenses (actual Klipsch ones, not the clones from ebay) and added those. Also I swapped out the 2446h JBL drivers for K691's, which are from what I understand B&C de75p drivers with a slightly modified diaphragm.
As for the DSP/crossover/delay settings, Roy Delgado at Klipsch actually put this style bass bin in their anechoic chamber with this horn lens and came up with settings for both. The setup he had was using the K69 compression driver (which is a P.Audio BMD750), so the HF PEQ settings and shelf filters were modified (since I'm using the K691) after some measurements, but it made for a good starting point. After several iterations and adjustments this project essentially turned into a LaScala bass bin with a Klipsch KPT-904-HF on top and 90% of their DSP settings, sort of DIY but not.
Now here's some photos, absolutely wild how much smaller the compression driver is than the JBL dinosaurs, the new horn lenses with "mumps" are nicer to look at too.
As for the DSP/crossover/delay settings, Roy Delgado at Klipsch actually put this style bass bin in their anechoic chamber with this horn lens and came up with settings for both. The setup he had was using the K69 compression driver (which is a P.Audio BMD750), so the HF PEQ settings and shelf filters were modified (since I'm using the K691) after some measurements, but it made for a good starting point. After several iterations and adjustments this project essentially turned into a LaScala bass bin with a Klipsch KPT-904-HF on top and 90% of their DSP settings, sort of DIY but not.
Now here's some photos, absolutely wild how much smaller the compression driver is than the JBL dinosaurs, the new horn lenses with "mumps" are nicer to look at too.
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hi again i built the last month two midbass horns for a friend.i made bigger from original plan 80cm deep 60cm bright and 70cm high.loaded with b&c 15pl40. here some pics.
no i don t have the time.only acoustic tests done and they are chest thumbing and very aqurate and clear there matters the heavy constraction material and bracing.is dificult to find here the right speaker for that box and we had offer some rcf s models new but their specs is for bass reflex and we desided to B&C model. it sounds amazing out of the box and after the burn time is gonna play more better . is start from 45hrz to 500hrz don t make use of any eq (i hate eqs) boxes have to play good without any of process only 24LR hi pass and low pass crossovers from one dynacord dsp260 processor .and yes is very very heavy made from 15mm board but is for instalation on my friends living room and not for turing.
Makes sense! Definitely looks solid. I'm sure your friend is happy to have them.
"the K691 feels less harsh and sibilant at higher frequencies than the big JBLs"
I've had roughly this experience; had a pair of 2445J that I wanted to build a system around, but other options sounded nicer.
"the K69 compression driver (which is a P.Audio BMD750)"
They do some good, basic gear.
"But where on eBay do you buy the horns?"
This was asked way back in 2020, so this answer may be irrelevant, but: ZXPC is an ebay seller who always has cheap + decent horns.
I've had roughly this experience; had a pair of 2445J that I wanted to build a system around, but other options sounded nicer.
"the K69 compression driver (which is a P.Audio BMD750)"
They do some good, basic gear.
"But where on eBay do you buy the horns?"
This was asked way back in 2020, so this answer may be irrelevant, but: ZXPC is an ebay seller who always has cheap + decent horns.
Absolutely agree about the 2445/6, I have mine for sale but I’m hesitant because I feel like they would be an absolute monster in a three way crossed at around 600-800Hz and with a tweeter taking care of 8+kHz.
Also agreed on zxpc, the K510 clone they make is sturdy enough to happily support a 32lb compression driver without any real complaints. Obviously being a relatively shallow horn that helps but still, impressed with the quality.
"I feel like they would be an absolute monster in a three way crossed at around 600-800Hz and with a tweeter taking care of 8+kHz."
Yes. However:
a) when I played around with this, I didn't get a 8kH crossover that I was happy with.
b) several 1" and 1.4" drivers can play down to about 1kHz, and have better HF than these monster 2" drivers. They seem like a better compromise.
I also got a pair of Community M200 (a pure midrange compression driver). Goes loud, measures OK, but I ended up deciding against it.
It seems I prefer a cone-driven midrange horn.
There was a sale on some 6" pro midranges, and I bought a stack of them - it looks like a clone of the Audax PR170MO. They work stupidly well on the horn I used to use for the 2445J - the horn bandpasses them so neatly (at about 300 and 1,000Hz) that I haven't bothered with a crossover.
I'm running this + a 1" JBL as the core of my current attempt at a "monster" rig.
Yes. However:
a) when I played around with this, I didn't get a 8kH crossover that I was happy with.
b) several 1" and 1.4" drivers can play down to about 1kHz, and have better HF than these monster 2" drivers. They seem like a better compromise.
I also got a pair of Community M200 (a pure midrange compression driver). Goes loud, measures OK, but I ended up deciding against it.
It seems I prefer a cone-driven midrange horn.
There was a sale on some 6" pro midranges, and I bought a stack of them - it looks like a clone of the Audax PR170MO. They work stupidly well on the horn I used to use for the 2445J - the horn bandpasses them so neatly (at about 300 and 1,000Hz) that I haven't bothered with a crossover.
I'm running this + a 1" JBL as the core of my current attempt at a "monster" rig.