hpf & lpf.. meaning?

[r_dizzel*]

kenwood kac-749s

on my amp it has a setting of HPF (high-pass filter) and LPF (low-pass filter)

• what are these controls?
• what do they do?

 

[AK]

IIRC low pass lets out bass only and high pass is treble only..

I think. someone else will confirm/correct

 

[Skinny]

What speakers have you got wired in?

It's a roll of system to cut off the frequency being sent to the speaker.

LPF is the bottom end roll off
HPF is the top end cut off.

 

[Lagerlout]

High-pass passes high frequencies but attentuates lower frequencies, Low-pass vice versa.

It's a resistor in with a capacitor in parallel in simple terms iirc

Is Google broke?

 

[msandford]

A low pass filter only outputs frequencies below the set level.
A high pass filter only outputs frequencies above the set level.

 

[wallop]

Filters are used to limit frequencies any given speaker will play....

You use the LPF to set the upper frequency you want your speaker to play...
You use the HPF to set the lower frequency you want your speaker to play...

These filters don't simply cut off frequencies, they have a gradual effect which is termed the 'Roll Off Slope'....The most common slopes used are 12dB and 24dB...

A LPF set at say 80Hz will still allow higher frequencies through, but as the frequency increases the output level diminishes....

This is why when initially setting amplifiers you opt for a LPF set at 80Hz and the HPF set at 100Hz. The missing frequencies will still be played, but by both speakers, which in theory will allow a seamless transition from mid driver to sub....

This is only a brief explanation, if your considering running active then a more detailed description of exactly whats what will be required.....