lak,
One thing I should have mentioned, is, if you plan to build a kit then learn to tweak it, then this is probably not the best kit to do that with.
This is a very basic amplifier circuit. It has low distortion at very low power, but as soon as the power gets up to anywhere reasonable, like 1W, the distortion is very high. No matter what component tweaks you do, you can't make much difference in that, it needs a different circuit.
One thing I should have mentioned, is, if you plan to build a kit then learn to tweak it, then this is probably not the best kit to do that with.
This is a very basic amplifier circuit. It has low distortion at very low power, but as soon as the power gets up to anywhere reasonable, like 1W, the distortion is very high. No matter what component tweaks you do, you can't make much difference in that, it needs a different circuit.