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avs20
05-12-2005, 11:55 AM
I recently installed some RE comps on a JL 450/4. My problem is whenever I set the amp to BPF, it cuts the comps off. Nothing will play through them. I have to set it on HPF...and even lpf works, but not BPF.
Anyone have any input?

squeak9798
05-12-2005, 11:59 AM
BPF = Bandpass Filter. You DO NOT want to bandpass the components (highpasses & lowpasses them at the same time). You only want to highpass them.

avs20
05-12-2005, 12:02 PM
10-4..over and out. I had read somewhere to BPF them...and was curious why you would need to/want to.
Either way..midbass is seriously lacking on the 6.5's. They are IB in my door..but I still expect SOME midbass.

squeak9798
05-12-2005, 12:05 PM
The conversation about bandpassing them was probably relating to something other than what you are doing ;) If you were running active, you'd need to bandpass the mids. You don't need to worry about this, since you are using the passive crossovers. You only need to highpass them.

So, where is the HPF set to?

avs20
05-12-2005, 12:22 PM
without looking...~65hz

squeak9798
05-12-2005, 12:27 PM
:eyebrow:

I would look first...LOL. With an xover point of 65hz, you should be getting plenty of midbass output.

Johnny Drama
05-12-2005, 12:35 PM
EDIT: nevermind

avs20
05-12-2005, 12:38 PM
squeak...truck was out front..so I took a guess. :) It's set at 65...which SHOULD have plenty of midbass...but doesnt. Hmm.

squeak9798
05-12-2005, 12:46 PM
I see you have two 18" MT's....is it possible that you concept of "adequate output" is slightly skewed??? LOL....that was a serious question, BTW ;)

Any EQ functions that you have set on you HU? Gain set to proper level? Attenuate the tweeter any (maybe the tweeter is too overpowering, giving the impression that the midbass is lacking)? How well did you deaden/seal the door? Subbass too overpowering??

DFW40
05-12-2005, 12:51 PM
I have had two different pairs or comps in my car and I had to play with the HU settings before they put out good midbass and I installed them correctly etc. I had to use one of the MX settings (similar to loud button etc) on my Alpine to get the right sound, with a completely flat signal there was not much midbass at all. I know that any sort of equalization or freq boosting is a no no but this was the only thing that worked for me.

Echo42987
05-12-2005, 01:03 PM
2 18" MT's and you can hear midbass....hm wonder why!?

avs20
05-12-2005, 01:07 PM
squeak..of course my concept of adequate output is skewed :) But my rear coaxials have more midbass than my comps...by far.
I havent deadened behind the door panel yet, but Ive deadened the door skins.

squeak9798
05-12-2005, 01:23 PM
I havent deadened behind the door panel yet, but Ive deadened the door skins.


Blah...read the deadening sticky, tune a little with the EQ.......until then, don't complain :p:

Try dropping the xover point more if possible. My current 6.5" mids honestly sounded better with a 52hz 12db/oct xover setting than they did when in the mid-60's. Just something to try, see how it affects the sound :)

GCAdidas13
05-12-2005, 01:24 PM
Cancellation anyone?

i know these are noobish reasons but hey i gotta post 'em.

one speaker wired incorrectly
inadequate baffle (stock plastic ones don't cut it), so make an MDF one
back wave isn't being killed by outer doorskin, add some sound deadening back there
baffle is not infinite enough - caulk off all holes within a foot or two of the speaker

if all else fails, you need some kicks for sure. or at least something sealed for the components.

or maybe the RE comps aren't so much a midbass driver. . .

Beat_Dominator
05-12-2005, 03:36 PM
I bet it's the fact that he has his comps IB. Mine are in an IB and they play great down to (guess) like 100-ish hz but to get that lower kick you need to build some baffles I bet.

avs20
05-12-2005, 03:39 PM
I will try deadening the rest of the doors. They are already secured to 3/4" baffles.

GCAdidas13
05-12-2005, 03:53 PM
Yeah... My DLS UR6 played AWESOME in IB setup down to 100hz but then broke up. i had to put a 24db/oct 100hz HP on them to get them to play loud and clean.

Try deadening the door and making it all sealed and stuff... then if that doesnt work seal them up.

Goodluck