IRS2092 + IRFI4019 Questions

[ziffel]

Hello,

I am considering buying a pair of LJM L-15D amps.I have a +/-55v supply. My speakers are 4 ohm. I read that the preferred power supply for 4 ohm speakers is +/-48v.

Will +/-55v present a problem with the IRS2092 + IRFI4019amps and a 4 ohm load?

Also, I use a tube preamp that I like very much. Is there an easy way to reduce the gain on the L-15D so I can continue to use the preamp?

Thank you

 

[Grib]

The gain is configured with R2/R8 ratio.
Page 29 http://www.infineon.com/dgdl/iraudamp7d.pdf?fileId=5546d462533600a40153569ad5ba2bf9

They recommend changing R2 only, because R8 affects the PWM control loop.
R2 should be located near the input signal connectors.

 

[ziffel]

Thank you Grib.

I think that shows me just what I need to experiment with gain resistor values.

Do you think that +/- 55vdc into 4ohms would lead to any problems with bus pumping, (p26 of the manual you linked)? I usually do not drive my speakers with much power.