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Old 19th September 2009, 09:59 PM   #1
vtech is offline vtech  Czech Republic
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Default Class-A BiAmp - my first design

This is my first design. It's the Class-A BiAmp. SPICE doesn't protest. It seems to work, but I've got no idea, if it really works. What do you think?
Click the image to open in full size.
The powersupply is an industry standard regulated stabilized 24V/10A.
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Old 20th September 2009, 09:14 AM   #2
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Default I think you already know that in normal music with have a proportion, a ratio.

60 percent of power goes to bass
30 percent of power goes to midranges
10 percent of power goes to treble

This is what we see into the musical waveform...that's the ratio we love (of course this is not precise..numbers can change depending musical style, taste, culture, ambience and so on).

We see into tree way speaker, and i have expertise in the learning dismounting and observing things, they use that ratio into woofer power, midrange power and tweeter power.... and they do this way to save money and increase profit.

So, if we have this ratio, i suggest you, to increase power into the bass amplifier or to decrease power into the treble...yeah!..you can just reduce volume, for sure you can reduce treble volume...BUT.... reducing power, or accepting that, you can use class A to treble, where the class A may need a very small crossover distortion...really, to bass, not so needed.

This way... class AB to woofer is more often used, as efficiency is bigger and the power produced is higher.

I am also doing this way.... and adjusting...and soon i will open a thread to post my thougths about.

here you have a sample...what i am still doing..adjusting using ears...try and error basis.... it is turning very, very, very good..soon will be excelent.... just more hours of very hard work and will be ready.... they are in inverse order..the first one is the last video made...so..the most evoluted one,but not the final one.... the last one was the starting of this job using that speaker enclosure.

http://www.youtube.com/watch?v=Aybx2UVWtQ4

http://www.youtube.com/watch?v=Ew7Sr1IA6h8

http://www.youtube.com/watch?v=q5NVcpmoVaQ

http://www.youtube.com/watch?v=rljMY96z13M

http://www.youtube.com/watch?v=cPqXEd1U6DM
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Last edited by destroyer X; 20th September 2009 at 09:22 AM. Reason: I could not correct post title..it is wrong written
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Old 20th September 2009, 10:33 AM   #3
vtech is offline vtech  Czech Republic
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Thank you for your reply.

Quote:
Originally Posted by destroyer X View Post
60 percent of power goes to bass
30 percent of power goes to midranges
10 percent of power goes to treble
Yes, I know about this. I've even spent some time analyzing my favourite recordings. I just wanted to keep the design simple.

I'll push the split frequency as low as the tweeter (not chosen yet) allows to balance the load as much as possible.

I'll check your videos.
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Old 20th September 2009, 04:14 PM   #4
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Default Very good..i am also working on BiAmp

regards,

Carlos
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Old 20th September 2009, 06:33 PM   #5
vtech is offline vtech  Czech Republic
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Default update

I have updated the design.
Click the image to open in full size.
Band is split at cca 2100Hz. I'm going to use 1800-22000 tweeter.
Now I'll try to build it.
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Old 20th September 2009, 09:16 PM   #6
vtech is offline vtech  Czech Republic
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Last update (I hope).
Click the image to open in full size.
Crossover frequency is now down to 366Hz.
I've changed my mind regarding speakers. I'm going to use full range + bass speaker.
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