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Old 18th August 2005, 11:16 AM   #31
el`Ol is offline el`Ol  Germany
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Quote:
Originally posted by JWFokker
I hope you're not referring to the stock Sonic Impact T-Amp. In it's stock form, it's very good for the money, but not great. The Sonic Impact amp uses pretty cheap parts. You should look into trying a higher quality Tripath amp, along the lines of an Amp3 or Amp6 from 41hz.com or the Tripath based amp from DIYParadise.com.

http://www.41hz.com/main.aspx?pageID=105
http://www.41hz.com/main.aspx?pageID=118
http://www.diyparadise.com/charlize.html

Of course, the Amp3 is primarily SMD based, so unless you're into that sort of thing, it's a PITA. I toasted mine because I don't have the hardware to assemble SMD parts. I did make a number of modifications to a Sonic Impact T-Amp, and the result was considerably better than stock form. With an Amp3/Amp6 or the Charlize amp, no modification would be necessary. I plan on picking one up in a couple weeks to replace my modded T-Amp.



But then you still have the problem that you need the right voltage for your speakers and listening habits, and the player will cost more than a Panasonic plus drive.
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Old 18th August 2005, 02:23 PM   #32
soongsc is offline soongsc  Taiwan
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Quote:
Originally posted by JWFokker

Of course, the Amp3 is primarily SMD based, so unless you're into that sort of thing, it's a PITA. I toasted mine because I don't have the hardware to assemble SMD parts. I did make a number of modifications to a Sonic Impact T-Amp, and the result was considerably better than stock form. With an Amp3/Amp6 or the Charlize amp, no modification would be necessary. I plan on picking one up in a couple weeks to replace my modded T-Amp.

Is the AMP3 really that easy to toast?
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Old 18th August 2005, 05:00 PM   #33
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Quote:
Originally posted by el`Ol



But then you still have the problem that you need the right voltage for your speakers and listening habits, and the player will cost more than a Panasonic plus drive.
What are you talking about with the voltage? The Amp3/Amp6/Sonic Impact T-Amp use 12-13.5V regardless of speakers and listening habits. And I don't know how you figure it'd be more expensive. An Amp3 is $25 and another $20-30 for the power supply. The cheapest Panasonic XR25 I found was $210. I think you can find a good player for under $160.

Quote:
Originally posted by soongsc


Is the AMP3 really that easy to toast?
Only if you try to build it with a 30W iron that wasn't ever intended for use with SMDs. I got it about halfway done, then got a couple parts stuck to the iron and toasted them. I should really have used epoxy and an iron meant for SMDs, but I was impatient.
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Old 18th August 2005, 05:35 PM   #34
el`Ol is offline el`Ol  Germany
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A class D amp works like a DAC. It has full dynamic range only when it is used at full volume. The volume control of a Tripath amp is done with a preamp or a potentiometer, the rail voltage is constant, and you have full dynamic range only when your desired max. output voltage is close to the rail voltage. The TacT Millenium and the Panasonics derived from it change the volume by changing the rail voltage and make use of the full dynamic range no matter what the desired max. output voltage is.
I would be curious to hear about good players for 150$.
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Old 19th August 2005, 01:13 AM   #35
soongsc is offline soongsc  Taiwan
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Quote:
Originally posted by el`Ol
A class D amp works like a DAC. It has full dynamic range only when it is used at full volume. The volume control of a Tripath amp is done with a preamp or a potentiometer, the rail voltage is constant, and you have full dynamic range only when your desired max. output voltage is close to the rail voltage. The TacT Millenium and the Panasonics derived from it change the volume by changing the rail voltage and make use of the full dynamic range no matter what the desired max. output voltage is.
I would be curious to hear about good players for 150$.
Which Panasonic models use class D?

I wonder if the 41Hz amps can be modified to do that easily.
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Old 19th August 2005, 03:51 AM   #36
el`Ol is offline el`Ol  Germany
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The class D models are the SA-XR series, as far as I know there are no stereo models. They are not only class D, they are full digital.
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