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Old 25th March 2004, 01:22 PM   #1
Stocker is offline Stocker  United States
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Question 1500VA...what do do?

I have a 1500VA transformer laying about that can deliver 50, 55, or 62 VAC depending on how it's wired (no center tap). I am not a fan of big hardware for a single channel (Pass designs) because of the size. So classA in general is pretty much out... but what else would you do? build a 5.1 integrated amp for a whole system? a house-destroying sub-amp? a 3-way stereo+sub amp? Would you make it discrete or all chip amps, or a combination of them?

Looking for ideas. Think outside the box. Winner receives a
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Old 25th March 2004, 02:22 PM   #2
sreten is offline sreten  United Kingdom
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Triamped stereo set up.

AC coupled mid and treble, possibly class A or enriched AB.

Bridged bass amps to get rid of the coupling capacitors.

Use 50V (bridged) for bass, 62V tap for midrange, 55V tap for treble.

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Old 25th March 2004, 02:42 PM   #3
UrSv is offline UrSv  Sweden
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Design a virtual ground circuit to keep the rectified voltage divided to two rails and the use it for whatever you fancy with 2*33-44 VDC?

Didn't QUAD do that in for instance the 405?

http://home.jps.net/~shiloh/
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Old 25th March 2004, 02:51 PM   #4
moamps is offline moamps  Croatia
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Quote:
Originally posted by UrSv
Didn't QUAD do that in for instance the 405?
[/B]
Hi,

IMHO, no.

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Old 25th March 2004, 03:08 PM   #5
Stocker is offline Stocker  United States
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Quote:
Originally posted by sreten

Use 50V (bridged) for bass, 62V tap for midrange, 55V tap for treble.

sreten.
Never thought of that! Out of curiosity, why not use the 62V bridged for bass? Seems to me you want as high a rail as you can get for mo' power...

Anyhow, great idea.

It occurs to me that this is the perfect start for a VERY small subwoofer using ESP's P48 sub processor and P68, high power variant, bridged.
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Old 25th March 2004, 03:15 PM   #6
UrSv is offline UrSv  Sweden
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Quote:
Originally posted by moamps


Hi,

IMHO, no.

regards
Seems not. Maybe somebody else then...
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Old 25th March 2004, 09:02 PM   #7
sreten is offline sreten  United Kingdom
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Quote:
Originally posted by Stocker


Never thought of that! Out of curiosity, why not use the 62V bridged for bass? Seems to me you want as high a rail as you can get for mo' power...

Just trying to balance powers a bit, 50v bridged = 100V.

Assuming 8 ohm :

50V only would give ~ 100w bass : 25W mid : 25W treble.

using taps = ~ 100w bass : 38W mid : 30W treble.

Of course its far more complicated than the above,
different driver sensitivities and impedances etc.

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Old 28th March 2004, 05:57 AM   #8
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Use a FW voltage doubler for +-95v rails. hang 2-3 300 wpc amps on it.
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