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Old 18th December 2012, 08:28 PM   #1
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Default Complete OB system based on the alpair 12p.

hi everyone, I want to build a complete speaker system (amp included) for around 600$ for my aunt. I have the space to go OB. I would like to go active. a 2-way. 15 inch woofer and the fullrange on top. Fullrange crossed at around 250hz...
35hz and up is my requirement.
since already 350$ is gone for the alpair 12p, I have around 250$ left to get the woofer, the plate amps and the t-amps (probably?)to drive the alpairs .

Ho can I make that happen?

What would be the best 15 wpc t amp to get? what woofer? ect

thanks
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Old 19th December 2012, 11:37 AM   #2
DeonC is offline DeonC  South Africa
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Hi

May I suggest you leave the Alpair 12, as good as they are, and maybe rather use Alpair 7, since you are going to use a woofer. Or maybe go for a pair of CHR-70 with woofers. Either way you'd have more of the budget left to spend on good woofers and amps. It's no use you have something as good (and revealing) as Alpair 12s, or even Alpair 7, and the rest of the system is not up to scratch. They will brutally reveal the rest of the system's shortcomings, and thereby ruin the sound. I would suggest looking at some of the threads talking about FAST speaker builds.

Enjoy,
Deon
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Old 19th December 2012, 01:40 PM   #3
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What nice of you to build a speaker for your aunt.

Lots and lots has been said about this very topic. Open baffle full range plus open baffle woofer.

I'll summarize some of the conclusions:

-a woofer with low qts needs too much eq in open baffle, hard to do on a budget
-a high qts woofer sounds sluggish

Either way you'll need some eq to boost the lower frequencies.

What i would suggest is 2x Eminence Beta 15 each speaker in a h-frame of some sort. Medium qts, cheap enough for 2x per side. You need the surface area.
Measure it and apply eq before amplifier.

Just make sure you have enough power because eq will eat those watts away. You can always bi-amp, this isn;t rly expensive now, chip amps work fine.
TK2050 chip for bass, make sure its 150W+
ta2020 chip for alpair

You can always add a supertweeter if high frequencies are a bit rough, which i suspect it will.


If you want no eq, no biamp etc. You need a high qts woofer. Look at goldwood woofers

Good luck

Last edited by serph1nia; 19th December 2012 at 01:44 PM.
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Old 19th December 2012, 02:23 PM   #4
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okay,so due to the complication, I would do a enclosure for the bass stystem and maybe OB for the alpair.
I dont like 4 inch fullrange and feel that they are tiring and have no body in the midrange, thats why I will use alpair 12p.
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Old 19th December 2012, 02:42 PM   #5
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im thinking to use one of the eminence pro woofer 15 inch. delta, beta or kappa or alpha. I can do a 130 liter box for the bass. which is the best bang for the buck, the kappa starts to be a bit expensive if I want to keep the pirce of the project low...

thanks
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Old 19th December 2012, 03:25 PM   #6
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Download WinISD to simulate frequency response from box speakers.

Im not sure Pro woofers give what you are looking for. They need big boxes, don;t go very low and you dont need the efficiency to mate it with the alpair.

But you don;t want the ultra high xmax low efficiency woofers as well.

I suggest the dayton rs270 driver. Or maybe the peerless sls 12 inch.
Bass reflex enclosures. Unless somebody can think of a driver for closed box down to 35 hz.
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Old 19th December 2012, 03:29 PM   #7
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okay, I have found the amp to power the alpair: Mkiii Tripath TA2020 PCB 25Watt Class T Amplifier Set | eBay

I want to go active for the bass so no need for matching efficiency. I want 15 inch woofer though, not 10 inch. I went for PA woofer but open to any recommendation.
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Old 19th December 2012, 03:30 PM   #8
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Quote:
Originally Posted by serph1nia View Post
Just make sure you have enough power because eq will eat those watts away. You can always bi-amp, this isn;t rly expensive now, chip amps work fine.
TK2050 chip for bass, make sure its 150W+
ta2020 chip for alpair
ta 2020 will be use for alpair, do you recommend this?: Mkiii Tripath TA2020 PCB 25Watt Class T Amplifier Set | eBay

and for the bass, what kit do you recommend?
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Old 19th December 2012, 04:13 PM   #9
vaughn is offline vaughn  United States
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I'm building 15A H frame woofers with 12P on an open baffle right now.

It is interesting to read the different opinions of the bass produced by OB 15As, most regard it as some of the best bass (quality, not extension) they've ever heard.

I've got 24" wide x 28" tall baffles for the 12Ps but I'm not sure exactly where to place the driver. The height will be dictated by my ear level, I'm just not sure how close to the edge the 12P should be placed. I've got a Mac so the Edge software is unusable.

I'm bi amping with a Behringer CX3400 > Crown D150A on the bass and running the 12Ps full range from a 2A3 amp.
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Old 19th December 2012, 04:54 PM   #10
ra7 is offline ra7  United States
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I would suggest you look at the Manzanita project here. OB on the cheap and guaranteed good sound. It is well vetted and supported. Can't go wrong.

Fast, fun, Inexpensive OB project - Page 46 - diyAudio

The vifa is much more linear than the alpair, btw. Check Zaph's measurements.

Last edited by ra7; 19th December 2012 at 04:59 PM.
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