P-Audio 15" coax - horn or cone feed best? - diyAudio
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Old 14th February 2007, 03:36 AM   #1
freddi is offline freddi  United States
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Talking P-Audio 15" coax - horn or cone feed best?

cone-feed? or 3"x6" rectangular horn?

which sounds best overall and is easier to deal with crossover-wise?

consideration of possibly going into a Karlson might be taken into account

I'm used to 3"x6" horn on Eminence and they're no picnic :^)
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Old 14th February 2007, 06:50 AM   #2
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I've only tried the cone style, so I cannot compare but it sounded pretty nice to me, next time I will use a variable l pad in the cross over design so that it ca be easly talored for different rooms. Its no tannoy but it was nice sound overall for its price.
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Old 14th February 2007, 02:12 PM   #3
freddi is offline freddi  United States
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Hi Cameron - which model did you try and where were its difficiencies? was it harsh in places?

Best,
Freddy
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Old 15th February 2007, 01:41 AM   #4
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It was a few years ago so I grabed my copy of the catalogue. It looks like it was the CXA, I liked the sound it had, a definite peak at 3.5 which perhaps should have been delt by my xo better.

Looking at p audios sheets, there A class 300cf complete speaker with box appears to use the horn BM15cxhb. it seems to have quite a flat response. I think I will try this driver next. Like many p.audio speakers there tight surround makes it a little light on bass, but the upside would be that it makes them very hard to distroy with a simple mistake.
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Old 15th February 2007, 05:41 PM   #5
freddi is offline freddi  United States
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what seemed the harder part to tame in 15CXA - woofer or HF?

15CXHA looks a lot like the old Eminence C15CX - mine sounded better with a disk of foam over the little horn spider to catch some HF spikes

PSD2002 input impedance on 3"x6" C15CX horn
http://img242.imageshack.us/img242/7619/tweetzwcg3.jpg

C15CX SP15 type cone woofer impedance in a Karlson box
http://img242.imageshack.us/img242/158/woofzwnj8.jpg

C15CX smooth cone woofer impedance in RCA-Fan's V-vent box
http://img135.imageshack.us/img135/2082/c15cxqj6.jpg

C15CX with CD8 rear view
http://img408.imageshack.us/img408/1083/coaxrjpgxx7.jpg

C15CX with Sp15 type cone front view in a coupler
http://img183.imageshack.us/img183/1...xft1jpgul8.jpg

15 Inch Coax with EV-SP15A type cone :151043 (MCM)
01-SPEC 151043 04-DATE 01/07/93
02-PART # OBS/55-1125
03-MODEL # 1530F9537
05-RE OHMS 6.34
06-LE MH .76
07-QM 7.15
08-QE .380
09-QT .360
10-XMAX MM 2.90
11-BL TM 18.03
12-EFF % 6.05
13-FS HZ 53.38
14-MMS GMS 58.26
15-CMS mm/N .1526
16-RMS NS/M 2.7340
17-VAS LTRS 157.15
18-SD SCM 856.34
19-EBP 140.1
20-SPL dB 99.8
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Old 18th February 2007, 04:04 AM   #6
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i'm very interested in this as well...for my own K15s. they're sitting incomplete and i'm not sure what direction to take them in. I'm leaning towards either a P-Audio coax or a 3-way active setup with Smith horns on top. If i go the coax route i wouldn't be sure which fo the two P Audio drivers to get...

by the way freddy, have you experimented much with port tuning in K15s? i remember you posted about using some PVC elbows on a plate instead of the stock port to bring the tuning down...how might this affect performance up to about 800ish hz? if at all?
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Old 18th February 2007, 04:17 AM   #7
freddi is offline freddi  United States
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that K15 was re-tuned to ~exemplar spec to play (boosted and with xover) down to 18-20Hz using low fs Altec and that would probably unbalance its normally ripe midbass. K15 makes a nice sub in that guise.
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Old 18th February 2007, 04:35 AM   #8
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18-20 hz would be an amazing thing to achieve, but probably a little excessive for my purposes. I would be happy with 40 or 45 hz...i mean 30 or 35 would be great too but i imagine there would be some compromises to be made. about how low can you take a stock K15 anyway with a decent driver?
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Old 18th February 2007, 09:09 PM   #9
freddi is offline freddi  United States
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outdoors in my yard which drops off, F6 is around 55Hz relative to 100Hz with Altec or EV -- going "deep" isn't a K's strength
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