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Old 7th February 2006, 07:20 PM   #1
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Default embarrassed to ask but

My power amp's spec tells me that it uses 8.4A with 120V. Using I=VA , power consumption is 1008watts. Now; if the voltage supply changes to 230V, am I right in saying that:
A=I/V = 1008/230 = 4.3A ?
Is it that simple?.
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Old 7th February 2006, 07:27 PM   #2
Giaime is offline Giaime  Italy
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It's that simple.

But don't expect to run the amp on 230V if it's designed on 120V, you'll burn it. You have to make some mods on the transformer connections IF the transformer allows to be used also in 230V countries.
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Old 7th February 2006, 07:48 PM   #3
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Its ok. The input is switchable. Its only ever been used in Europe, but the manual is USA only. I was just curious to know how many of them I could run from a UK 13A socket
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Old 7th February 2006, 08:00 PM   #4
lineup is offline lineup  Sweden
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8.4 A
This is a worst case value.

If you do not try to blow your walls out,
the average current drawn will be less then 6.5 A.

and means you can power 2 units from same socket = 13 A, at 120 V AC.

13 A at 230 V AC
gives socket can deliver 2990 Watt
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Old 7th February 2006, 08:14 PM   #5
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Get sure they have soft start.
If music signals are not corelated (every amp for different instrument in rock band for example) you'll have quite a margin if you assume 4.3A.
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Old 7th February 2006, 08:18 PM   #6
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Default Re: embarrassed to ask but

Quote:
Originally posted by Pbassred
My power amp's spec tells me that it uses 8.4A with 120V. Using I=VA , power consumption is 1008watts. Now; if the voltage supply changes to 230V, am I right in saying that:
A=I/V = 1008/230 = 4.3A ?
Is it that simple?.
Just wondering, what kind of an amp is this? Output power?
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Old 8th February 2006, 08:41 AM   #7
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The amp is a Peavy 8.5C = 425W per chan into 4ohm. Yes its soft start.

I've also just bought a Studiomaster MOSFET 1000W - as well ( don't have a manual for it.) Yes I know that this is DIY audio, but its the best source of audio intelligence.
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Old 8th February 2006, 09:25 AM   #8
AndrewT is offline AndrewT  Scotland
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Hi Pbassred,
is your wall socket outlet fed from a ring or a spur from the distribution board?

I'll explain your loading options once I know.

If you're not sure and you are competent (safe) with mains electric then you can check this yourself.
See if there are two cables feeding the back of your wall socket outlet or only one set of cables?
If you have two sets, then power off at the distribution board, disconnect (very carefully) the red supply from the screw connector. Insulate both ends by placing each bare end into a terminal strip connector. Test the voltage on both bare ends. If only one is live you are on a spur (or your ring is faulty). If both are live then you are on a ring.

TAKE CARE with mains voltage.

An easy way to check if you have switched the correct MCB:- insert a noisy drill or similar into the wall socket outlet and lock the off/on switch to on. Go to the fuse board and turn off/ withdraw the fuse. If the drill keeps running you have pulled the wrong fuse. Keep trying.
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Old 8th February 2006, 10:08 AM   #9
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Andrew,
Unlikely that I would ever run 1800 Watts at home! This is Sound reinforcement gear. In that case the answer is likely to be;...

A cracked single 13A socket, below a radiator, above a beer soaked carpet, shared with the fruit machine. At least, it was last time I played!
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