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Old 25th April 2006, 09:32 AM   #1
panos29 is offline panos29  Greece
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Default 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?
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Old 25th April 2006, 10:16 PM   #2
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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.

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Old 25th April 2006, 10:51 PM   #3
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By wee bit, I would say 40V rail with 4V loss on the cap
multiplier.
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Old 25th April 2006, 11:59 PM   #4
XELB is offline XELB  Portugal
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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
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Old 26th April 2006, 08:58 AM   #5
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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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Old 27th April 2006, 01:03 PM   #6
panos29 is offline panos29  Greece
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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!
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