Class D Audio, Who are these guys? - Page 11

nhuwar · 8th November 2009, 10:39 PM

Does anyone know what the peak input signal voltage is on these amps? That is the input signal voltage needed to make full power on the output?

Thanks,
Nick

vaughn · 8th November 2009, 11:13 PM

x2, I would like to know if it can be driven to full output from my DAC...

DougSmith · 9th November 2009, 03:58 AM

I think its supposed to be ~3V for the ones I have (250W x 2).

- Doug

nhuwar · 9th November 2009, 04:24 PM

Well I'm scratching my head now. I hooked it up to the front channels on my outlaw audio 990 and at full volume it was probably only about 40db. The same amp I have connected to my preamp outs on my sound card and it would easily reach 100 db.

But the outlaw hasn't been configured yet so I'm hoping the problem is there.

Nick

authlxl · 11th November 2009, 11:22 AM

I have use tas5615 and tas5630 make our product,place some photo on here.there are some error for this chip,please attention carefully to use this chip.

Mark Allen · 11th November 2009, 02:02 PM

So I don't quite understand what you are trying to say here... Other then you have to be very careful when designing a board to use this chip... That is well nkown and some parts placement is critical.

Mark

roby2k · 13th November 2009, 09:00 AM

Hi to all,
I'm new in this good forum. I'm italian and my english is very bad.
I hope you will understand me.
I have a classdaudio amp, 125 watt x 2 8 ohm. I bot the complete kit from classdaudio.com.
I am very happy with this amp but there was a problem.
I don't have a preamp so I use only a passive preamp with 10K pot.
Now it's enough good, but before I had a 50k pot and was not good.
I'm sure that the problem is that this amp have a very very low input impedence.

I asked many time to Tom about input impedence value but he don't answered me.

I hope that here he will answer me, or someone can help me.
I'd like to know this data beacause I think that I can encrease than sound quality.

Thanks,

Roberto.

avionic · 26th November 2009, 02:52 AM

Hello, Just wanted to post my experience with classdaudio and Tom. I bought the 125x2@8ohms kit and it was received very quickly. I wanted to fire it up so bad that I half *** wired it up

. Poof, smoke the whole nine yards. I was very angry at myself. I contacted Tom and let him know what I had done and that I would have to buy another board. Tom said send in the blown amp and he would fix it. Wow! Long story short Tom sent a brand new amp to me! Just got it mounted in a chassis and wired up correctly and could not be happier with the performance. Very nice sounding amp!
This was my first amp project. I know it is no where near what some of you have done ,but it was a big deal for me. I could not have done it without Tom at classd and all of the knowledge from you folks here on diy. Thanks everyone and especially Tom at classdaudio.

Mark Allen · 28th November 2009, 03:08 PM

I agree! Tom and Class D are good examples of how well a company stands behind their products. They certainly set a standard for other companies(that care) to follow...

Mark

vaughn · 28th November 2009, 03:43 PM

I just received my 48v smps yesterday and am going to be trying out my new amp today(the "600 watt" version)

13th November 2009, 09:00 AM	#107
roby2k diyAudio Member Join Date: Nov 2009 Location: Italy, naples, caivano	input impedence Hi to all, I'm new in this good forum. I'm italian and my english is very bad. I hope you will understand me. I have a classdaudio amp, 125 watt x 2 8 ohm. I bot the complete kit from classdaudio.com. I am very happy with this amp but there was a problem. I don't have a preamp so I use only a passive preamp with 10K pot. Now it's enough good, but before I had a 50k pot and was not good. I'm sure that the problem is that this amp have a very very low input impedence. I asked many time to Tom about input impedence value but he don't answered me. I hope that here he will answer me, or someone can help me. I'd like to know this data beacause I think that I can encrease than sound quality. Thanks, Roberto.

26th November 2009, 02:52 AM	#108
avionic diyAudio Member Join Date: Nov 2009	Hello, Just wanted to post my experience with classdaudio and Tom. I bought the 125x2@8ohms kit and it was received very quickly. I wanted to fire it up so bad that I half *** wired it up. Poof, smoke the whole nine yards. I was very angry at myself. I contacted Tom and let him know what I had done and that I would have to buy another board. Tom said send in the blown amp and he would fix it. Wow! Long story short Tom sent a brand new amp to me! Just got it mounted in a chassis and wired up correctly and could not be happier with the performance. Very nice sounding amp! This was my first amp project. I know it is no where near what some of you have done ,but it was a big deal for me. I could not have done it without Tom at classd and all of the knowledge from you folks here on diy. Thanks everyone and especially Tom at classdaudio.

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8th November 2009, 10:39 PM	#101
nhuwar diyAudio Member Join Date: Jan 2007 Location: Tomball Texas	Does anyone know what the peak input signal voltage is on these amps? That is the input signal voltage needed to make full power on the output? Thanks, Nick

8th November 2009, 11:13 PM	#102
vaughn diyAudio Member Join Date: Feb 2008	x2, I would like to know if it can be driven to full output from my DAC...

9th November 2009, 03:58 AM	#103
DougSmith diyAudio Member Join Date: Oct 2008	I think its supposed to be ~3V for the ones I have (250W x 2). - Doug

9th November 2009, 04:24 PM	#104
nhuwar diyAudio Member Join Date: Jan 2007 Location: Tomball Texas	Well I'm scratching my head now. I hooked it up to the front channels on my outlaw audio 990 and at full volume it was probably only about 40db. The same amp I have connected to my preamp outs on my sound card and it would easily reach 100 db. But the outlaw hasn't been configured yet so I'm hoping the problem is there. Nick

11th November 2009, 02:02 PM	#106
Mark Allen diyAudio Member Join Date: Jan 2008 Location: Bountiful, You-Taw	So I don't quite understand what you are trying to say here... Other then you have to be very careful when designing a board to use this chip... That is well nkown and some parts placement is critical. Mark

28th November 2009, 03:08 PM	#109
Mark Allen diyAudio Member Join Date: Jan 2008 Location: Bountiful, You-Taw	I agree! Tom and Class D are good examples of how well a company stands behind their products. They certainly set a standard for other companies(that care) to follow... Mark

28th November 2009, 03:43 PM	#110
vaughn diyAudio Member Join Date: Feb 2008	I just received my 48v smps yesterday and am going to be trying out my new amp today(the "600 watt" version)

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