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bdub213 31st May 2012 12:43 AM

Logitech Amp Reuse
 
1 Attachment(s)
Hello,

I was wondering if I could use the amp from my logitech x-220 speakers as a separate, external amp. See, the amp is rated for 32 watts, but since I would no longer be using the sub-woofer with the system, I was thinking there would be problems getting 32 watts solely to the speakers. Would I be right in saying so? All help is appreciated!

h_a 31st May 2012 06:59 AM

Certainly you can use this module as 'external' amp - if you have troubles getting the full power, just crank up the volume ;)

sbrads 31st May 2012 08:48 AM

The satellites are rated at about 6 watts rms and removing the 20 watt sub won't help much, probably 7 or 8 watts max to each satellite as the power supply won't sag as much.

bdub213 2nd June 2012 03:28 AM

Thanks for the help. Are there any modifications I could do to allow me to get 32 watts to the satellites?

sbrads 2nd June 2012 04:45 PM

Quote:

Originally Posted by bdub213 (Post 3045398)
Thanks for the help. Are there any modifications I could do to allow me to get 32 watts to the satellites?

Not easily. You would have to increase the supply voltage, which basically means a complete new PSU, and have either bigger output devices and bigger heatsinking or possibly just bigger heatsinking (or a fan) on the current devices. You would have to check output driver device ratings also. Some R and possibly also C values may need changing as well and the bias could go haywire. So, you would need a circuit for starters or it's all guesswork. It's probably a chip amp anyway, thinking about the type of system this is, so look to see if there's a device number and google the datasheet for it, that will tell you exactly what the maximum power is at whatever supply voltage.

The speakers would probably melt anyway if you were successful!

techbiker 2nd June 2012 11:21 PM

See if you can read anything on the chip at the bottom of the pcb (the bottoms of the picture you posted). That is most likely a chip amp that is powering your board.

Solution:

Get one of these! ;)

Crown Com-Tech 400 Power Amplifier | eBay

bdub213 3rd June 2012 12:58 AM

Well the chip says TDA7377, is there any hope for me? (btw, I'm a complete n00b at this stuff if it wasn't obvious)
oh and thanks for the link techbiker, I'll get one right now ;)

whizgeek 3rd June 2012 01:23 AM

1 Attachment(s)
It never ceases to amaze me how Logitech et al can complicate a simple amplifier... anyway:
TDA7377 datasheet says it can do 2 x 35W max./4Ω. You will have to do some major rework on the pcb to get to this, but possible. maybe build a new pcb is easier....
However just change from 3 to 2:

clm811 23rd September 2012 02:50 PM

Logitech Amp Reuse
 
I also have a similar amp, from the Logitech X-230 woofer.

The difference is it uses a 9 pin D-sub connector to the satellites (see link).

Logitech X-230 Subwoofer cable pinout and wiring @ pinoutsguide.com

If I were to use this amp to power a woofer only, how should one arrange the power & signal connections + grounds (add a switch, RCA jack, etc.), for use together with satellite speakers powered by a conventional receiver or amp?

-Chas


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