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Old 21st November 2012, 08:23 AM   #1
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Default Beginner question about V, A and my Topping


I recently bought a Topping TP21 amp.

When doing research before purchase, I read in various places about how the power supply can make a difference, some people were upgrading theirs etc etc.

The specs of the Topping TP21 are here TOPPING TP21

So the input is 14V and 4A. The 'power brick' the amp came with has this.

If I deviated from this and used a different power brick, what would happen? (improved sound quality? damage to the amp?).

How would I know what is is safe to use?

I think I understand why the amp doesn't have a power supply inside the amp, but not sure what the difference is between a power brick and wall wart.

I may experiment with trying to improve sound quality in future, but at the moment I am curious, no, intrigued!

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Old 21st November 2012, 09:19 AM   #2
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Location: San Antonio
Virtually all electronics has an operating voltage range. With the Topping amp, it isn't clear what that range is. You could do a little reverse engineering to find out. IMO it probably isn't worth the effort, so I'd stick with the 14V input. If a higher amperage 14V supply could be found, it could be tested for audible improvement.

A power brick is the type with two cords coming out opposite ends, and is usually a switching type.
A wall wart plugs directly into the wall socket (hence the name), and has just one cord coming out. It's usually a linear type, though smaller lighter switching types are becoming more and more common.
It is error only, and not truth, that shrinks from enquiry. - Thomas Paine
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Old 21st November 2012, 01:30 PM   #3
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the chip is rated at absolute max 16V, max operating 14.6V. so don't increase the voltage.

you could up the rated amps in your supply, maybe it would help with transients.

also, 2x25W (their 4 ohm claim) from a 14V and 4A supply is impossible unless they've designed some magical new way for their circuitry to dissipate very little power. so maybe if you are using 4 ohm speakers you could do with more current.
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Old 21st November 2012, 01:41 PM   #4
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Thanks for both the replies so far.

So maybe I could try 14V and 5A. Would that be safe? How do I know what the upper limit is for A?

Also, is it W into the amp that matters most at the end of the day? 14V x 5A is 70W (I think), could I therefore lower the V and increase the A to achieve the same or similar W? (in case I couldn't find a 14V/5A power brick, say.

I am also wondering why my amp came with a power brick, and my DAC (Beresford 7510) a wall wart.

Again, just learning here...thanks for any help.
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Old 21st November 2012, 02:11 PM   #5
Mooly is offline Mooly  United Kingdom
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The type of PSU it came with will be down primarily to economics and a "power brick" is a cost effective solution for that voltage.

Amps... the amplifier will draw what it needs. Think of a 12 volt bulb and two batteries. One is 10Ah and the other is 100 Ah (Ah = amp hour or the "size of the battery). The bulb draws the same current from either battery although the 100Ah one is much heftier.

So your amp is still safe even on a 10 or a 100 amp PSU. It will draw what it needs and hopefully if the design is good the amp will limit internal if its drawing to much current.

I doubt whether there would be any benefit at all in going for a higher rated (amps) PSU.
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Old 21st November 2012, 10:41 PM   #6
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Thank you!
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