View Full Version : Lpf/hpf

01-28-2003, 12:37 AM
my deck has these features called Low Pass Filter and High Pass Filter, they each have 3 possible settings: off, 78Hz and 125Hz.....i was just wondering what combination of settings would produce the best bass.....and also what are LPF/HPF?


01-28-2003, 12:41 AM
LPF == low pass filter.
HPF == high pass filter

Basically your frequency cutoff for your outputs to the subs and the speakers. Normal speakers don't do a great job of delivering low frequencies, and subs don't do a great job of delivering high frequencies. Therefore you use the LPF and HPF to cut the highs and lows to the respective speakers to make them only get signal for highs and lows. More efficiency.

01-28-2003, 12:47 AM
so which is better for putting more bass towards the subs and away from speakers?

01-28-2003, 01:06 AM
low pass filter

01-28-2003, 01:13 AM
so i want it at like 80Hz instead of like 125Hz?

01-28-2003, 10:17 AM
Low pass should be 80hz with a 12db octave slope for smooth, low bass.

01-28-2003, 11:34 AM
so LPF/HPF is basically like using caps?? (or those freq cutoff things) on speakers then...except you control it on the deck vs cutting out the frequency via the input/output.

01-28-2003, 11:40 AM
You're thinking of a crossover network MrX, and a LPF/HPF is basically the same thing, just a lot more simple and adjustable. Real crossover networks would require the replacement of components to change the crossover frequency.

Most amps have built in lpf/hpf crossovers and most decent decks have adjustable ones.

all about only sending the signals a speaker can reproduce to the right speaker/sub.