chip amp recomendation - Page 2

lanchile · 8th February 2012, 01:54 AM

Quote:

Originally Posted by GloBug

Sounds like a plan! I purchased a box of 20 4700uf Rubycon USR from eBay, (actually I found out the seller was a member here and in the swap meet area too.)

I could use up to 4 of those per rail, I'm looking forward to trying it!

4.700uf X 4 per rail in the power supply will be very good!!!
I did try from 10uf (joke) to 40.000uf per rail with the LM3875 from Audiosector and from 10.000uf and up the bass got really noticeable (can feel it). There are people that like the small value capacitance (joke) for power supply.

GloBug · 8th February 2012, 02:00 AM

OK I will try that.

Are you talking with or without larger smoothing caps?

lanchile · 8th February 2012, 02:13 AM

I am just talking about just the power supply. and in the future you can always "jump" to discrete amps (Solid state) like I did and never turn back.

GloBug · 8th February 2012, 02:23 AM

Oh OK Lanchile, I was slowly typing a response when you posted above.

I guess I could do 5 x 4700uf per rail, use the the whole box up on one chipamp.

I don't think I will miss the 10uf in the power supply. Yes it sounded great, it still sounds great with the ~6500 per rail I am trying now.

lanchile · 8th February 2012, 02:31 AM

Quote:

Originally Posted by GloBug

Oh OK Lanchile, I was slowly typing a response when you posted above.

I guess I could do 5 x 4700uf per rail, use the the whole box up on one chipamp.

I don't think I will miss the 10uf in the power supply. Yes it sounded great, it still sounds great with the ~6500 per rail I am trying now.

Go for it!!!. You will "never" miss that 10uf cap.

kentan · 8th February 2012, 10:05 AM

Thanks for your replies..

I have 4 pa150 cards from alexw88, and have thought to build one parallel/bridged chip amp... but ... I am afraid this will be a little to big a setup? I don't really need this a big amp. (my sudden is 2*25w class A). But I think the parallel and bridge configuration is one of the best?.. or are the other configuration that works better?
My proac uses a custom seas excel 5,25 driver.. and they can normally take about 120w.... so if I don't think I need more?

Any ideas?

Kenneth

GloBug · 8th February 2012, 11:53 AM

I guess its how you define better, if you think you need the power, go for it.

I am running my LM3875 at + / -35v rails, giving me the roughly stated spec of 56W (per channel) I find it plenty loud with my particular speakers.

The amps are cheap enough, build one of each!

Sjef · 8th February 2012, 10:28 PM

It's all about the synergy between amp and loudspeakers. Amps and loudspeakers are almost always considered as two independed things, they are not. They really have to be considered as one system, they do interact pretty heavily on each other. Commercial sellers hav to sell amps and loudspeaker apart from each other so they are always stuck in designing amps with low output impedance, high current reserve, high spedd etc but at the cost of other area's. We are doing DIYAudio here and we don't have to sell amps or loudspeakers so we can actually design our own system as one system and not as seperate parts.

The gainclone with small capacitance is most defenitly NOT a multipurpose amp. It either works in your system or it doesn't. I like them in my system as power amp for midrange duties but never liked the ones with high psu capacitance.

Sjef · 8th February 2012, 10:42 PM

It's all about the synergy between amp and loudspeakers. Amps and loudspeakers are almost always considered as two independed things, they are not. They really have to be considered as one system, they do interact pretty heavily on each other. Commercial sellers hav to sell amps and loudspeaker apart from each other so they are always stuck in designing amps with low output impedance, high current reserve, high spedd etc but at the cost of other area's. We are doing DIYAudio here and we don't have to sell amps or loudspeakers so we can actually design our own system as one system and not as seperate parts.

The gainclone with small capacitance is most defenitly NOT a multipurpose amp. It either works in your system or it doesn't. I like them in my system as power amp for midrange duties but never liked the ones with high psu capacitance.

GloBug · 8th February 2012, 11:13 PM

Others have a similar opinion as you Sjef.
I will see what happens, if I do not like it I will make a Bi-amp with the chipamp.com boards I have here and revert the Audiosector back to stock.

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8th February 2012, 02:00 AM	#12
GloBug Banned Join Date: Jun 2011	OK I will try that. Are you talking with or without larger smoothing caps?

8th February 2012, 02:13 AM	#13
lanchile diyAudio Member Join Date: Sep 2008	I am just talking about just the power supply. and in the future you can always "jump" to discrete amps (Solid state) like I did and never turn back.

8th February 2012, 02:23 AM	#14
GloBug Banned Join Date: Jun 2011	Oh OK Lanchile, I was slowly typing a response when you posted above. I guess I could do 5 x 4700uf per rail, use the the whole box up on one chipamp. I don't think I will miss the 10uf in the power supply. Yes it sounded great, it still sounds great with the ~6500 per rail I am trying now.

8th February 2012, 10:05 AM	#16
kentan diyAudio Member Join Date: Sep 2009	Thanks for your replies.. I have 4 pa150 cards from alexw88, and have thought to build one parallel/bridged chip amp... but ... I am afraid this will be a little to big a setup? I don't really need this a big amp. (my sudden is 2*25w class A). But I think the parallel and bridge configuration is one of the best?.. or are the other configuration that works better? My proac uses a custom seas excel 5,25 driver.. and they can normally take about 120w.... so if I don't think I need more? Any ideas? Kenneth

8th February 2012, 11:53 AM	#17
GloBug Banned Join Date: Jun 2011	I guess its how you define better, if you think you need the power, go for it. I am running my LM3875 at + / -35v rails, giving me the roughly stated spec of 56W (per channel) I find it plenty loud with my particular speakers. The amps are cheap enough, build one of each!

8th February 2012, 10:28 PM	#18
Sjef diyAudio Member Join Date: Jan 2003 Location: Amsterdam	It's all about the synergy between amp and loudspeakers. Amps and loudspeakers are almost always considered as two independed things, they are not. They really have to be considered as one system, they do interact pretty heavily on each other. Commercial sellers hav to sell amps and loudspeaker apart from each other so they are always stuck in designing amps with low output impedance, high current reserve, high spedd etc but at the cost of other area's. We are doing DIYAudio here and we don't have to sell amps or loudspeakers so we can actually design our own system as one system and not as seperate parts. The gainclone with small capacitance is most defenitly NOT a multipurpose amp. It either works in your system or it doesn't. I like them in my system as power amp for midrange duties but never liked the ones with high psu capacitance.

8th February 2012, 10:42 PM	#19
Sjef diyAudio Member Join Date: Jan 2003 Location: Amsterdam	It's all about the synergy between amp and loudspeakers. Amps and loudspeakers are almost always considered as two independed things, they are not. They really have to be considered as one system, they do interact pretty heavily on each other. Commercial sellers hav to sell amps and loudspeaker apart from each other so they are always stuck in designing amps with low output impedance, high current reserve, high spedd etc but at the cost of other area's. We are doing DIYAudio here and we don't have to sell amps or loudspeakers so we can actually design our own system as one system and not as seperate parts. The gainclone with small capacitance is most defenitly NOT a multipurpose amp. It either works in your system or it doesn't. I like them in my system as power amp for midrange duties but never liked the ones with high psu capacitance.

8th February 2012, 11:13 PM	#20
GloBug Banned Join Date: Jun 2011	Others have a similar opinion as you Sjef. I will see what happens, if I do not like it I will make a Bi-amp with the chipamp.com boards I have here and revert the Audiosector back to stock.

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