0 Simple Bass-Boost Circuit using transistor

What this circuit do is allow only low frequency (bass) signal and filter the high frequency out. After the filtering, the signal is amplified. The circuit acts more like a low pass filter. Click diagram to enlarge.

amplifier schematic

Part List:
R1 - 500 kilo ohms 1/4W
R2 - 4.7 kilo ohms 1/4W
R3 - 56 kilo ohms 1/4W
R4 - 56 ohms 1/4W
POT1 - 50 kilo ohms potentiometer
POT2 - 50 kilo ohms potentiometer
C1 - 220uF electrolytic capacitor rated 16V
C2, C5 - 4.7uF electrolytic capacitor rated 16V
C3, C4 - 100nF
Q - 2N2222 or similar NPN transistor
Audio jack - for "signal in" and "signal out"
9V battery

2N2222 pinout