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Car Audio amp....?

post #1 of 3
Thread Starter 

I have high end 2ch car audio amp (Focal FP2.75) sitting around collecting dust. It has a S/N of  >100. I could easily wire a 12v power supply to run it, and make a custom cable to connect headphones to.

 

The real question I have is how would this compare to an actual headphone amp?

 

I realize this amp would be much too powerful for most headphones, but I can always keep the gain low.

 

For the sake of simplicity, lets just assume a good DAC is used for both cases.


Edited by rc10mike - 4/28/13 at 5:32am
post #2 of 3

The problem (in theory) is impedance mis-matching.  Car audio amps are designed for very low impedance loads, .5-4 ohms.  No headphone impedance dips that low.  So you are using the circuit in an application that it really wasn't designed for.  Attributes like noise, DC offset, stability, frequency response, turn on/off transients...etc  are up in the air.  Heck give it a try with a KSC75 or similar cheap headphone.

post #3 of 3
Quote:
Originally Posted by rc10mike View Post

I have high end 2ch car audio amp (Focal FP2.75) sitting around collecting dust. It has a S/N of  >100. I could easily wire a 12v power supply to run it, and make a custom cable to connect headphones to.

 

 

You can always sell it and get a dedicated headphone amp with a volume knob that's easier to grip, on top of the other technical concerns.

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