Great sound from PA Coaxial?

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#43
#44
#45
Audio Elite said:
Care to share more details, crossover, cab etc?
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They are mounted in 17L bass reflex cabs tuned at 65Hz. The crossover frequencies I tried are 1200Hz and 1000Hz. The 1000Hz frequency allows, on my units, a flater response / less EQ. I got 96dB/octaves slopes to compensate for the lower than recommended Xover.

I am using a Najda box (FIR Xover) for DSP/preamp and a Bryston multi channels amp. There is also a BMS 18N862 woofer with a Hypex FA501 amp in a 125L closed box for the frequencies below 150Hz.

I haven't any screenshots right now, but measurement wise it looks very good on the aspects of FR, IR and distorsion.

Subjectively, the stereo image is great, the sound is at the speakers distance (not projected, not at the back). Lots of details, virtually no listening fatigue and I find they are very forgiving to less than ideal recordings.

I wanted to try coaxials for many years and I must say I am not disappointed with these.
 
#47
Let's continue the discussion a bit more.

Many new Coaxial come with a dedicated horn, which in theory should yield a smoother response, however looking at some of the response graphs that does not always seem to be the case. Look at BMS 12CN680 vs 12C382. And if you can believe the Faital 12H230 it's beamwidth is quite smooth. So what gives? A bit of modulation? Quite frankly, I think they look rather stupid :whazzat:

Also 12C382 and 10C262 seem to have a well damped second impedance peek on the compression driver. The Faitals don't seem to have this. B&C 12FCX76 also has this, next to a very low resonance frequency for the driver. Response seems to be more ragged though.. but who can tell from those frequency plots anyway.. On AudioeXpress it looks much better.

It's too bad that there are not a lot of objective, comparable measurements to be found of these.


@chris661, you said you applied FIR to the 10HX230. What did you do there? just EQ the thing flat, or was it also need to straighten out the phase?
 
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#48
yes, the b&c 12" ferritmagnet coax do looks very nice in the voice coil magazine, the tweeter response looks superb for being a coax, but i would like to see more measurements of that driver before i buy it.

but coaxials in general do have so large response errors that most is pretty much useless, at least to me that want a linear freq response on and off axis. but there are many options if i can live with uneven frequency responses, i have tried some but they just do not work for me in the long run at critical listening. but coaxials do have some traits that is awesome
 
#51
4real said:
@chris661, you said you applied FIR to the 10HX230. What did you do there? just EQ the thing flat, or was it also need to straighten out the phase?
Click to expand...

I set off with EQing the thing flat in frequency response, and then I applied FIR to get flat frequency and phase response curves from 100Hz upwards.

Excellent sound - very "correct".

I'd highly recommend the 10HX230 drivers. They sound great, and are happy to take lots of power.

Chris
 
#52
Nissep said:
It was his triangle suggestion that turned me on to that one.
I have missed that he will buy it sometime soon.

The high frequency looks a little to good to be true.
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HI,
I did get the Sica 6x in the end. Beautiful built driver but the CD response is far from factory specs. The edge of voice coil is sticking up above the mouth and creating a dip in response. However, I doubt it has any serious impact of sound as it's mainly flattened off axis. I will try to even it out with some porous paper..

The lower midrange is though really nice, the drivers are still in test boxes but hopefully there will be round enclosures in the end🙂
 
#57
I think HF sound goes between horn and LF cone and reflect back from bottom. There should be attenuation at some HF frequency, based on distance of trip to bottom. I believe that holes make variation to that distance and soften attenuation.


Opinion is based to tests I have made with Paudio SN-150CX. I have considered to make same kind of holes to that.
 
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