[cloudbaseracer]

I have tried to search for this online and it may not be even possible but.... I wonder if there is a way to run a class d receiver off of a battery supply?  Is there enough power in 2-3 car batteries to provide the needed juice? Wouldn't there be some advantages to this?

I honestly have no clue if this is just so far out in left field that it cannot be done but I thought I would ask you guys here. 

[*Scotty*]

The battery/batteries have to supply same amount of voltage that is present on the power supply rails. A 100 watt/ch receiver could easily need as much as 54volts positive and 54volts negative. Thats a lot of car batteries in series.
 In addition to the main supply rails there will be many other lower voltages present taken from multiple taps off of the transformers secondary winding. You will have to duplicate these DC voltages as well.
 It might be possible to isolate just the main power supply rails to the output stage and graft in the battery voltage just ahead of the power supply caps for this voltage value. I would bet on it being a major PITA to do, however you could get lucky.
This winds up being a vary involved project whose sonic benefits are questionable when applied to the circuitry found in a typical receiver.
 Battery power supplies are usually applied to simpler pieces of gear like preamps and power amps. These applications usually require only one voltage to be applied at the location formerly occupied by the rectifier and immediately ahead of the main storage capacitors.
Speaking for myself, I would give this idea a pass.
Scotty

[ttan98]

Hi,

I have done it myself, use 4*12V sealed battery each rated 5amp hour, 2 in series and then parallel the other 2 to give you 24 volts dc. My Class D is the Sure 50 Watter.

If you don't want to build it yourself see Danny from GR research he may have some left.