85V rails at Lme49830 IRFP240/IRFP9240 amp

[giaspyr]

I have your SA2012 PCBs finished populated with their components too, the only reason I chose to use the ones I posted above is the extra pair of IRFPs that I hope it will give me the extra something for the use of the amp to drive pairs of 9" woofers.

[JMFahey]

What astx said.

Including keep the MosFets, forget Bipolars here, use driver IC as intended.

Good luck with your project.

Only point that worries me is:

pair of 9" woofers whose impedance @20-300Hz ranges from 3.5 to 6.0 Ohm

which makes me fear:



Those are 4 ohm woofers, so use them in series for 8 ohm per pair.

[giaspyr]

Thanks JM, I'll go for a new trafo with dual 0-50VAC secondaries, as for the woofers they are in parallel and not 4Ohm each, speaker's impedance drops only down to 3.5/3.2Ohm @30 and 100Hz according to the graph.