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Old 10th January 2006, 06:47 PM   #1
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Default Which one of these amps to drive my sub?

I want your opinion, about these two amps...

http://sound.westhost.com/project3a.htm (Elliot's)
http://www.ampslab.com/c200.htm (ampslab)

Which one is better, in overall terms ? I'll use it to drive a nice 4 Ohms subwoofer, and in your opinion, which one is better at lower frequences, and are better designed?

I was determined to build the c200, but I found recently this amp at the elliot's site, and it appears to be better in my opinion.

I bought the transistors to build the c200, but they were all fakes So, now I can choose again which amp I'll build !

c200 is more powerful, but not in my system, cause it will be supplyed with 32+32v only...


Thanks !!
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Old 10th January 2006, 07:13 PM   #2
MikeB is offline MikeB  Germany
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Go for the P3A, that's a proven design, like the C300 the C200 also shows "fatal" design flaws... The C200 will give you unacceptable high DC-offset...
If you're interested in ampslab, go for the BI-series.

With 32v, you could also go for a symasym. (click my www)

Mike
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Old 10th January 2006, 07:32 PM   #3
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The C200 and C300 seem to no longer exist? What is the flaw with these circuits?
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Old 10th January 2006, 07:43 PM   #4
MikeB is offline MikeB  Germany
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The C200 is COMPLETELY unbalanced (for example: 47k at input,10k at feedback with low gain inputdevices), and the C300 has some properties that might blow it when driven into clipping, and is not really stable.

Mike
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Old 10th January 2006, 08:50 PM   #5
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Quote:
Originally posted by MikeB
The C200 is COMPLETELY unbalanced (for example: 47k at input,10k at feedback with low gain inputdevices),

This can be easily fixed , using a 47k feedback resistor instead of the 10k and changing the lower arm feedback resistor , for the same overall gain.
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Old 11th January 2006, 03:03 AM   #6
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So ?
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Old 11th January 2006, 01:08 PM   #7
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P3a is a good amp, tried and tested. It is also simpler. There is a dedicated ESP forum where you can get help as well.

However the ampslab ones come as a kit so there's no issue sourcing the right parts. However the kit could cost more than you buying the parts yourself, I don't know what's available in your country or what prices are like.
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Old 12th January 2006, 08:53 AM   #8
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I´d go with the subwoofer amp on the esp site, as its spesificlly designed for the purpose.
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Old 12th January 2006, 09:50 AM   #9
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There is no need for that extra expense, size and complexity given his small power supply and power requirements.
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Old 12th January 2006, 05:37 PM   #10
mcp is offline mcp  United States
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Quote:
Originally posted by nando
c200 is more powerful, but not in my system, cause it will be supplyed with 32+32v only...
The c200 is not designed for this voltage.


Quote:
Originally posted by MikeB

...the C300 the C200 also shows "fatal" design flaws... The C200 will give you unacceptable high DC-offset...

The C200 is COMPLETELY unbalanced (for example: 47k at input,10k at feedback ...
There are no design flaws. Without resorting to servos and trimpots, these "unbalanced" values actually minimise the DC-Offset that is inherent in such topology. Set both at 47K and DC Offset will exceed 100mV.


Quote:
the C300 has some properties that might blow it when driven into clipping, and is not really stable.
The c300 is very stable. It will even survive a dead short at the outputs.
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