Downscaling ZV9?

panos29 · 25th April 2006, 08:32 AM

How viable is the downscaling of ZV9 to half the original power? I am asking as I got in hand a nice chassis able to dissipate about 60W per channel and also as my speakers are more than 97dB I really do not need all that power.
I was thinking something like of 25-27VDC power supply.
Any ideas-help?

GRollins · 25th April 2006, 09:16 PM

I have not built a Zen #9, but I can say from experimentation here that--at least in my design--there's a threshold value for the rail around 25-30V below which the performance begins to fall off. There's a smallish performance gain above that, but not enough to cause you to wet your pants.
I don't see any reason not to drop the rail a wee bit on a Zen 9.

Grey

Nelson Pass · 25th April 2006, 09:51 PM

By wee bit, I would say 40V rail with 4V loss on the cap
multiplier.

XELB · 25th April 2006, 10:59 PM

Congratulations Mr. Pass, I just saw a great review in a french magazine, "Haute Fidelite".
The PASS X 350.5 it's the new reference

panos29 · 26th April 2006, 07:58 AM

Thanks alot for the replies!
Can anyone guide me towards what should be changed to the schematic for about 30VDC? I was also thinking, since the voltage will be lower to take advantage of "lighter" mosfets in order to gain from the higher transconductance these devices got(something like IRF610-620etc).

panos29 · 27th April 2006, 12:03 PM

After some copy/paste operations to the original schematic i think I managed to downscal the ZV9 to 30VDC power supply to suit my needs.
If anybody thinks there is some mistake, or place for improvement (always is) please post it.
Any comments are more than welcomed!

25th April 2006, 08:32 AM	#1
panos29 diyAudio Member Join Date: Dec 2001 Location: ATHENS, GREECE	Downscaling ZV9? How viable is the downscaling of ZV9 to half the original power? I am asking as I got in hand a nice chassis able to dissipate about 60W per channel and also as my speakers are more than 97dB I really do not need all that power. I was thinking something like of 25-27VDC power supply. Any ideas-help?

25th April 2006, 10:59 PM	#4
XELB diyAudio Member Join Date: Dec 2004 Location: Lisboa	Off-Topic Congratulations Mr. Pass, I just saw a great review in a french magazine, "Haute Fidelite". The PASS X 350.5 it's the new reference __________________ If you want power you must add control

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25th April 2006, 09:16 PM	#2
GRollins diyAudio Member Join Date: Feb 2001 Location: Columbia, SC	I have not built a Zen #9, but I can say from experimentation here that--at least in my design--there's a threshold value for the rail around 25-30V below which the performance begins to fall off. There's a smallish performance gain above that, but not enough to cause you to wet your pants. I don't see any reason not to drop the rail a wee bit on a Zen 9. Grey

25th April 2006, 09:51 PM	#3
Nelson Pass The one and only Join Date: Mar 2001	By wee bit, I would say 40V rail with 4V loss on the cap multiplier.

26th April 2006, 07:58 AM	#5
panos29 diyAudio Member Join Date: Dec 2001 Location: ATHENS, GREECE	Thanks alot for the replies! Can anyone guide me towards what should be changed to the schematic for about 30VDC? I was also thinking, since the voltage will be lower to take advantage of "lighter" mosfets in order to gain from the higher transconductance these devices got(something like IRF610-620etc).

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