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Old 31st May 2015, 11:42 PM   #1
tilroh is offline tilroh  Australia
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Default Bob Brines, Mark Audio T7-A7

I finished these the on the weekend. The 7Ps had been "breaking in" for a little over a month on a Trends 10.1 chip amp.

Click the image to open in full size.

They sounded good driven by a 50w/c transistor amp and played quite loud. Then I compared them to my FF165WK MTLTs (also by B. Brines) driven by a 8w/c SET tube amp. The 6" Foxtex drivers in boxes about 10 times larger, not surprisingly, sounded much more pleasant and fuller if maybe not as precise. I knew the Alpair 7Ps, without sub-woofers couldn't compete and moved them to the smaller office.

Click the image to open in full size.

Where they sounded fantastic! My wife was struck by the sound, stopped and listened for a while. If you're not impressed with a pair of speakers, move them to a different room. The SMSL SA-36A PRO 2* 20W TPA3118D2DAP powered by a 19v laptop adapter drives them easily. I'm thrilled with these small speakers, and so is my wife!

Thanks Bob for this design.

Cheers, Mack

Last edited by tilroh; 31st May 2015 at 11:43 PM. Reason: thank Bob
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Old 1st June 2015, 12:07 AM   #2
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Old 1st June 2015, 12:31 AM   #3
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Quote:
Originally Posted by tilroh View Post
The 7Ps...
Mack, A7p? Those look like silver A7.3

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Old 1st June 2015, 12:50 AM   #4
tilroh is offline tilroh  Australia
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Mack, A7p? Those look like silver A7.3

dave
ah, could be, I can't remember and the box is at home.
They are the metal cones.
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Old 1st June 2015, 12:52 AM   #5
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A7p have paper cones.

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Old 1st June 2015, 02:25 AM   #6
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The T7-A7 was designed for the A7.3. With minor stuffing changes it will work with the A7.2, A7P and CHN-70. I use this speaker as the tops for a 2-way with 12" sealed woofer on the bottom. DSP XO 200-300Hz range depending on the room and the day of the week.

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Old 1st June 2015, 04:53 AM   #7
tilroh is offline tilroh  Australia
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I reckon the next box I build will be a sub for the T&-A7s. I'm thinking a T3116 2.1 would be a quick & inexpensive amp but the stereo channels run full frequency and I want to relieve them of lower freq. duties.

Last edited by tilroh; 1st June 2015 at 05:15 AM.
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Old 1st June 2015, 06:44 AM   #8
zman01 is offline zman01  Bangladesh
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Is your source going to be a PC?

Assuming you have a multi-channel sound card (most PCs do nowadays), you can also use the PC sub-woofer out; Check out the options if possible - you should be able to adjust XO frequency too.

The TPA3116D2 2.1 amps present a simple solution - not sure about XO frequency adjustment though.
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Old 1st June 2015, 06:53 AM   #9
tilroh is offline tilroh  Australia
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I'm using Daphile on an old laptop.
Only outs are USB. It will run several DACs at once tho.
I hope there's a good 2.1 amp available. 'Would make it so easy.
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Old 1st June 2015, 01:04 PM   #10
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The TPA3116 amps are in general very good. My personal amp is a Yaun Jing and I like it a lot. I've not seen good reviews of the 2.1 amps, primarily because the XO functionality is not good. I recommend that you get something like a miniDSP or do a line-level XO and then a separate amp for your sub(s). I have not had good luck with plate amps and do not use them.

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