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Old 1st November 2008, 02:42 PM   #1
jives11 is offline jives11  Europe
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Default cheap Chinese amp modules on ebay . Anyone know what they are ?

Hi, while meandering around on ebay I noticed lots of 2 channel integrated amps being sold in a small package, and designed to run from a 12v supply. they cost around $20 (prices varies depending on wether or not you have free postage) and seem to come from Hong Kong.

This is an example, and I wondered if anyone knows what they use internally ?

http://cgi.ebay.co.uk/Hi-Fi-Audio-St...20127003r10192
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Old 1st November 2008, 03:37 PM   #2
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It says 180 W + 180 W , into 4 ohms I guess as the load impedance range is quoted as 4 to 16 ohms.
Power supply requirement is 12 V at 6 Amps. Thats 72 watts power consumption and 360 watts power output ! That means the output power is about 5 times the input power !

That explains all I guess.
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Old 1st November 2008, 04:40 PM   #3
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Default Re: cheap Chinese amp modules on ebay . Anyone know what they are ?

Quote:
Originally posted by jives11


This is an example, and I wondered if anyone knows what they use internally ?

Ashok summed it up with the magical power output.

I like the specs, minimum THD - is that with the unit turned off?
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Old 1st November 2008, 04:42 PM   #4
jives11 is offline jives11  Europe
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Default Re: Re: cheap Chinese amp modules on ebay . Anyone know what they are ?

Quote:
Originally posted by MJL21193



Ashok summed it up with the magical power output.

I like the specs, minimum THD - is that with the unit turned off?

amazing eh , and all for $20


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Old 2nd November 2008, 08:10 PM   #5
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Quote:
Originally posted by ashok
Thats 72 watts power consumption and 360 watts power output ! That means the output power is about 5 times the input power !
Yes, the heatsink size already indicates that the amp must be really efficient.
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Old 2nd November 2008, 11:56 PM   #6
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No those huge number of Watts are Chinese Watts. Not the same as RMS.
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Old 3rd November 2008, 07:25 AM   #7
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I recently saw a car amplifier with 10 kW output power on eBay. That's 13,6 HP at 100 % efficiency.
Add the air conditioning you need to get rid of all that dissipated heat, and a small car might be left with no power at all to move.
Of course the motor would also have to fight against additional weight from the cables you need for 10000 W / 12 V = 833,3 A plus losses.

Now, how much Chinese Watts does it take to make a normal Watt?
Maybe the demands on the car are not as bad as they seem?
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Old 3rd November 2008, 12:49 PM   #8
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Quote:
Originally posted by pacificblue

Now, how much Chinese Watts does it take to make a normal Watt?
Maybe the demands on the car are not as bad as they seem?
I heard that they mix melamine in with the silicon so that the output will measure higher than it actually is.
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Old 3rd November 2008, 01:15 PM   #9
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Google PMPO. It's a useless rating a lot of cheap equipment is using now.
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Old 3rd November 2008, 02:09 PM   #10
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Quote:
Originally posted by Redshift187
Google PMPO. It's a useless rating a lot of cheap equipment is using now.

And fooling the average Joe. It's at the point where a true 500 watt sub amp sounds ridiculously under powered.
HT in a box with 1500 watts! Amplified computer speakers = 400 watts.
Oh, car audio. Lets not forget about those ratings.
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