I am in need of an amplifier to drive two 20 W 4 Ohm speakers. They are used more like solenoid pushers than for audio generation. I have been looking into designing my own, but before sinking a lot of time into it I'd like to know if it's a waste of time.
The signal being amplified will be between 0.1 Hz and 1Hz.
So to reiterate the question, are there any fundamental problems with devising my own circuit to drive these two speakers at these low frequencies?