2 volts across the speaker output - sure amp

[konman]

Hello

I have a sure amplifier, 100w x 2.

One speaker output is popping the speaker cone outwards when plugged in.

I put a multimeter on the speaker output and its presenting 2 volts DC.

Also between the ground of the amp to the positive output terminal there's 13 volts.

Is there something seriously wrong with this amp? I'm giving it 27 volts from a meanwell power supply.

I bought this direct from sure electronics a while back .. So most probably can't take it back.

Any ideas?

 

[JonSnell Electronic]

Are you using a dual voltage power supply (-13v 0v +13v)?

 

[konman]

No I'm not. The power supply only outputs + and - voltage.

Something like this http://www.homanndesigns.com/store/images/nes-350.png

 

[konman]

Alright so.. I take it that its screwed. I'll ditch it in the trash

 

[nigelwright7557]

The supplies are usually +, - and ground.
If you have left ground floating you might have fired the amplifier.
I would try it again using a dual power supply and see if it still works.

Be aware with some class d amps if you don't connect a speaker you can sometimes get odd voltages on the speaker output.
IRS2092 based amps can sometimes put 17VDC on the speaker output if no speaker is connected. The amp relies on a load to make the circuit oscillate.

 

[kevinkr]

Most small class D amps I've seen use a single supply and have bridged outputs.. You measure across the outputs and it probably will not work quite right with no load. Try again with 4 - 8 ohm power resistors. (I guess given the date it may already be too late whether or not this amplifier is in fact bad.)