I need help!!! Which formula is best to find the total resistance of this 2 watt amplifier

I need to know the formula of this 2 watt amplifier. I only know their
basic formula of resistors. I need to know the formula of all of the
electronics parts at http://space.tin.it/scienza/fladelle/Page33.htm
to find the total resistance for this 2 watt amplifier, how to make
basic modification and what formulas to use to change frequency and
the volume of the loudspeaker. I need to know the simplist way to
figure out this formula and give me some examples on how to modify
this 2 watt amplifier and how this amplifier works. To find out more
about this 2 watt amplifier go to
http://space.tin.it/scienza/fladelle/Page33.htm

Thanks for your help!!

 

There is NO single formula, or two, or ten, formula approach. You must
UNDERSTAND the circuit, not a formula. Go for some basic electronics books,
such as "Microelectronic Circuits" (Sedra/Smith) or so.

Ricardo

 

C2 is backwards, should be (+) to the right side.

-Bill