Hi guys, quick question please.
I'm trying to figure out what the power output capabilities of chipamps are when the input signal is overdriven/distorted, as in a guitar amp with overdrive/distortion effects. So let's take these
TPA3116D2 or TPA3118D2 which are the ones I have in mind for my guitar amp. At 20V supply, 4ohms load, in PBTL mode, both chips should be able to put out about 40W with THD below 1%. But if the chipamp poweramp input signal is distorted by the preamp, does that increase the output power of the chipamp without further distorting the signal? Or is the distortion a function of the output power (instead of the gain/amplification at the power amp)?
LONG STORY:I've built a SS guitar amp using a preamp design by phatt from ssguitar.com and an aftermarket TDA7297A poweramp board. That theoretically gives me some 5W on the output power on 8ohms, 12V supply.
Now I'm considering upgrading the power amp to a
TPA3116D2 or TPA3118D2 that I would be powering with a 20V laptop brick for some extra output power. The plan is to go up to some 40-50W on 4ohms and 20V which both the TPA3116D2 and the TPA3118D2 should be able to cope with in PBTL mono mode.
But, the TPA3118D2 doesn't have an external heatsink, so I fear I might cook it when using distortion effects if the distortion considerably increases the output power, and also that pushing the output power of the chipamp may add extra, unwanted distortion
Hope that's not too much of a mess. Thanks