mit

iTrader: (10)

Hi, im after a low pass filter that i can plug into the RCA output on my TV, so i can connect a sub woofer i have that has no filter. The bass on my Samsung TV is a bit lacking.
Do these exist? I've looked everywhere!!

Thanks,Mit

AndyC_772

iTrader: (2)

If you're handy with a soldering iron it's dead easy to make one - all you need is an ordinary phono cable, one resistor and one capacitor.

john_s

iTrader: (1)

If you CBA making one, you could try Maplin or a local car audio shop (maybe even Halfords).

mit

iTrader: (10)

Thanks! Do you know the values of the resistor and cap? I take it the cap goes across the +ve and -ve, and the resistor in line with the +ve?

Mit

AndyC_772

iTrader: (2)

Depends on what frequency you want it to begin rolling off at.

Try 1.5uF (= 1500 nF) and 1kOhm, which will give you a -3dB point at 100 Hz. Decrease the value of the resistor to increase the cutoff frequency and vice versa, you might want to try a few different values to see which sounds best in your system.

The resistor goes in line with the signal (ie. the centre pin of the RCA jack), and the capacitor goes from the end of the resistor nearest the subwoofer to ground (ie. the shell of the connector).

Don't use a polarised electrolytic cap, it won't work properly.