aleph or not aleph

jeapel · 28th August 2005, 04:49 PM

hi

For the mini A or aleph 3 i would like to know if
someone try just for testing to remove the 220uF
for current modulation and to get just a ccs and
hear the sound what is the difference ok the
output power is not the same but just for the sound.

thanks

Blues · 28th August 2005, 06:55 PM

I'm sure Mr. Pass has tried it and we all know he put it back in. The CCS feedback makes the Aleph have more headroom and would be more speaker friendly. We all know all speakers' impedance are not flat across the audioband and will occassionally dip depending on the program material.

jeapel · 28th August 2005, 09:18 PM

hi

-more power and more speaker friendly sure

-but to get no dip with frequency you need a low zout and

the global feedback give a low zout but you tell me

the ccs feedback give also a low zout

winslow · 28th August 2005, 09:47 PM

I thought that I read an old post where it was said the CCS would have benefits on the topend.

jeapel · 28th August 2005, 10:09 PM

hi winslow

newbie with old questions it s possible :-)

but the conclusion was ??

thanks

winslow · 28th August 2005, 10:30 PM

I'm a newb too...looking for the post now, but can't find it. I thnk the suggestion was try it and see if you like it. But I'm curious as well. Hopefully you'll have better luck with people helping you out than I have around here.

Maybe it was here-

The effect of the ac current gain in Aleph

Nelson Pass · 28th August 2005, 11:07 PM

There's not that much consensus on the best setting for an Aleph
current source. We have played with it anywhere from 0 (CCS)
to 100%. The listeners we have tested with seem to have
preferences ranging from about 30% to 70%, but this figure
encompasses different speakers, music, levels, and taste.

50% gives the best efficiency figure, but the optimum gain
sonically depends on the above variables and also the bias.

As you go toward 0, you must double the bias in order to reach
the same power spec, and typically increase the feedback by
12 dB or so to maintain a similar distortion spec.

As you go toward 100, you must also double the bias to remain
in Class A, but you can get theoretically get "vanishingly low"
distortion with such an approach.

If you don't increase the bias as you increase the gain, you will
run into cutoff on the current source at higher power levels, and
it's not pretty.

jeapel · 29th August 2005, 01:16 AM

thanks Mr. Pass

I just print out your answer with all possible variations.

The truth is often suprising the most for me is lower
distortion with aleph current modulation.

a newbie meet a star wow! great forum :-)

GRollins · 29th August 2005, 02:06 AM

If you look at the current modulation as feedback, it's not too hard to see how it can lower distortion.

Grey

winslow · 29th August 2005, 03:22 AM

Doesn't the new Aleph J do away with all capacitors in the signal chain?

28th August 2005, 04:49 PM	#1
jeapel diyAudio Member Join Date: Sep 2003 Location: quebec	aleph or not aleph hi For the mini A or aleph 3 i would like to know if someone try just for testing to remove the 220uF for current modulation and to get just a ccs and hear the sound what is the difference ok the output power is not the same but just for the sound. thanks

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28th August 2005, 06:55 PM	#2
Blues Lightning In A Bottle diyAudio Member Join Date: Sep 2003 Location: Bremerton, WA	I'm sure Mr. Pass has tried it and we all know he put it back in. The CCS feedback makes the Aleph have more headroom and would be more speaker friendly. We all know all speakers' impedance are not flat across the audioband and will occassionally dip depending on the program material.

28th August 2005, 09:18 PM	#3
jeapel diyAudio Member Join Date: Sep 2003 Location: quebec	hi -more power and more speaker friendly sure -but to get no dip with frequency you need a low zout and the global feedback give a low zout but you tell me the ccs feedback give also a low zout

28th August 2005, 09:47 PM	#4
winslow diyAudio Member Join Date: Aug 2005	I thought that I read an old post where it was said the CCS would have benefits on the topend.

28th August 2005, 10:09 PM	#5
jeapel diyAudio Member Join Date: Sep 2003 Location: quebec	hi winslow newbie with old questions it s possible :-) but the conclusion was ?? thanks

28th August 2005, 10:30 PM	#6
winslow diyAudio Member Join Date: Aug 2005	I'm a newb too...looking for the post now, but can't find it. I thnk the suggestion was try it and see if you like it. But I'm curious as well. Hopefully you'll have better luck with people helping you out than I have around here. Maybe it was here- The effect of the ac current gain in Aleph

28th August 2005, 11:07 PM	#7
Nelson Pass The one and only Join Date: Mar 2001	There's not that much consensus on the best setting for an Aleph current source. We have played with it anywhere from 0 (CCS) to 100%. The listeners we have tested with seem to have preferences ranging from about 30% to 70%, but this figure encompasses different speakers, music, levels, and taste. 50% gives the best efficiency figure, but the optimum gain sonically depends on the above variables and also the bias. As you go toward 0, you must double the bias in order to reach the same power spec, and typically increase the feedback by 12 dB or so to maintain a similar distortion spec. As you go toward 100, you must also double the bias to remain in Class A, but you can get theoretically get "vanishingly low" distortion with such an approach. If you don't increase the bias as you increase the gain, you will run into cutoff on the current source at higher power levels, and it's not pretty.

29th August 2005, 01:16 AM	#8
jeapel diyAudio Member Join Date: Sep 2003 Location: quebec	thanks Mr. Pass I just print out your answer with all possible variations. The truth is often suprising the most for me is lower distortion with aleph current modulation. a newbie meet a star wow! great forum :-)

29th August 2005, 02:06 AM	#9
GRollins diyAudio Member Join Date: Feb 2001 Location: Columbia, SC	If you look at the current modulation as feedback, it's not too hard to see how it can lower distortion. Grey

29th August 2005, 03:22 AM	#10
winslow diyAudio Member Join Date: Aug 2005	Doesn't the new Aleph J do away with all capacitors in the signal chain?

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