Maximum output with tda2050

[sangram]

Classic ground loop. Connect both on the same outlet strip, and ensure the RCA input jacks are insulated from the chassis.

The 2050 is optimistic peak maximum, hardly the continuous output. 50 W is voltage x voltage /impedance, assuming the current output is within the chip limits. And voltage output = voltage input x gain, assuming the amplifier has the correct supply voltage.

Plug the numbers in, and you get 20V into 8ohms for 50W output, a trivial task for an amp with 50V rails. I do not know what the input voltage is, but assuming it is .775V line level, you need a gain of roughly 26, or ~30dB(?)

[pra3718]

Finally, on your chips - I see you're pushing the TDA 2050 to the edge. It was not meant to handle 2 ohm loads, but it'll survive. It probably sounds nasty but since it's for the sub, you'll likely not notice. Anyway 3x5 heatsink is way too small for the 2050, not surprised that it's heating up. I think PB earlier suggested two 2050, one for each 4 ohm speaker, with each chip on its own sink. That will reduce the load and help the poor chips relax a bit, with resultant reduction in distortion. I would recommend you immediately implement this.

After listening for long time, I realise tda2050 is still working for 2 ohm loads with 64 gain. Infact I had altered esp's schematic for some reason which is as under.

1) Input impedance resistor 33K ( It was available to me.)
2) Feedback resistor 340 R insted of 680 R ( for increase gain )
3) Frequency stability caps : Two nos 100 nf
4) RF filtter skiped.

I realise that some song (music) sounds very-very good, but in some songs (specially classical) I found bass is tearing. Is that reason I have build this circuit out of limits ? Or, Is there any way to rectify it ?

Thank you & Regards.