hey all,

i recently had a system installed in my car and it sounds sweet. The other day i was out mucking around having a look at how they setup the amps and stuff and found that my sub is being highpassed. I have always thought that u lowpass a sub. The thing is i switched the amp to lowpass and it sounded like shyt. The bass was no where near as tight as when highpassed and became kind of droney.

Is this a common way of setting up a system?? or have they accidentally stuffed it up. I had it done at technik car audio here in west oz who have a good reputation so they know what they r doing. Just like to know your thoughts on this.

cheers

What kind of Deck tdo you have ??
This may be because they have decided that the Crossover in the amp is too low and High passing it sounded better..
Not sure...

i have a pioneer DEH-P5550, the highpass in the headunit is being used for the splits. The filter on the amp ranges from 40 to 350 hz i think.

Low pass for subs only......they arent made to play high frequencies.

Set it to low pass and set to it to about 80-150hz. (have a play around see what u like better)

your sub should only have bass coming out of it.

How do i know what frequency i am setting it at? all it has is a screw with 40hz written on one side and 350hz written on the other. will one full rotation swing from 40hz to 350hz, how do i know what frequency it is at now??

Are you sure its the sub that is hp, and not the front splits? Flicking it to lowpass would cause bass to sound shyt...

Double check which channels you are hp'ing...

No sub would be highpassed... Perhaps subsonic filter... or bandpass... but never highpass.

Peace

Tim

As above, subs should only be running on LPF (so when there's no beat, the sub should be doing nothing). Moving the frequency around will depend on your personal preferrence, i find setting it higher gives you punchier bass, whereas setting it lower gives you a deeper bass sound but not as punchy. Could also depend on the setup too.
And yes make sure it's not your splits that are set to HPF.
In theory if your sub was set to HPF, you wouldn't get any bass out of the system at all except for the splits.

i have 2 separate amps, one for splits and one for sub. The sub amp, a lanzar heritage 2 channel is bridged for the sub. Will this affect how the filters work??

Nope...
Everything should still work fine...

If you only have the subs on can you only hear bass? or can you hear some midrange (vocals etc) coming through the sub?

i tried to do that and have a listen but i was not sure is there anyway i can turn off my fronts and have only my sub playing?? i know how to turn off the sub but not the fronts.

un plug the RCA's to the Amp that is amplifiying your fronts , then you will be able to listen t o the subs.

un plug the RCA's to the Amp that is amplifiying your fronts , then you will be able to listen t o the subs.
Yep and fade the headunit to the front to turn off the rears.

ahhhh yeh no kidding didnt even think of that. ill give it a go
cheers guys