need active bandpass midbass crossover

[robspeed2002 10+ year member]

To run some front 6.5" subs as midbasses in the 50/60z-150hz range. anybody know of a narrow bandpass crossover, or one that can be configured that way?

Here is the plan/idea:

rear sub (active lowpass):

2x10" ==> 25-50/60hz (370w mono)

front midbass (active bandpass):

2x6.5"==>50/60-150hz (2x75w stereo)

front components (active highpass):

2x5.25"==>150-3000hz (2x75w stereo)

2x1" ===>3000-20,000hz (passive from ^^)

thanks in advance! //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

Click to read more...

 

[Volenti 10+ year member]

There's a couple of ways to do this, exactly what depends on what x-overs your amps and headunit have.

For example, if your headunit has hi/low filters onboard you could low pass the output going to the midbass amp at 150hz, then on the amp you would set the high pass at 50hz, giving you the bandpass filter from 50-150hz. If your headunit can't do that you could buy a cheap basic active x-over to do the lowpass before the amp.

So essentially if your amps have good built in x-overs, all you need is an external 2 way active x-over to do what you want to do.

 

[James Bang 5,000+ posts]

I'm assuming that your HU has a 2 way x-over. What you can do is high pass the front/rear @ 50-60hz on the HU. 50-60hz low pass for the sub.

from there, i would have the amp for the 6.5" midbass low passed @ 150hz on the amp.

150hz high passed for the front comps on the amp.

no need for an active x-over that way.

 

[95BlackGA 5,000+ posts]

Get something like this. http://cgi.ebay.com/NEW-SOUNDSTREAM-PQ-7-PARAMETIC-CAR-EQUALIZER-CROSSOVER_W0QQitemZ270124038998QQihZ017QQcategoryZ14931QQrdZ1QQcmdZViewItem

 

[James Bang 5,000+ posts]

$200 more can get you a nice processor...

but if money's an issue, you can try what i suggested. it should work. if not, maybe someone will point it out.

 

[robspeed2002 10+ year member]

Thanks for those suggestions, the thing is my equipment is all oldskool aka without internal crossovers. my head unit is at least fifteen years old. and my amps are oldskool PPI without crossovers. I do have a ppi crossover, one that splits out the sub and gives you hipass for front and rear speakers.

What about using these:

http://www.crutchfield.com/S-1F6tewdaBPI/cgi-bin/ProdView.asp?g=82600&I=069900063

inline with:

http://www.crutchfield.com/S-1F6tewdaBPI/cgi-bin/ProdView.asp?g=82600&I=069900075

that would give me 70-200hz of midbass... i realize these are passive filters, do they **** up the phase/sound? anyone use them before?

i would still use the PPI crossover to lowpass the sub output below 70hz, and highpass the front sats (a/d/s/ 320is) over 200hz... i think this will work and allow me to use the currently unused 75wx2 channels on my 4x75w PPI/Crutchfield amp to make some nice front-stage low midbass... //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif

 

[robspeed2002 10+ year member]

hmmm maybe at 50hz,,,, i think that would be better than 70... let the 10s do only the sub sub bass and the 6.5s carry SOME sub bass but not the lower lows... i wish they had 60hz filters.... hmmmmm....

 

[Louisiana_CRX 5,000+ posts]

I didn't know they still made fmods I played with some years ago and didn't like them....

 

[helotaxi 5,000+ posts]

A coustic XM6 can be had NIB on eBay for right at $50 shipped.

 

[robspeed2002 10+ year member]

A coustic XM6 can be had NIB on eBay for right at $50 shipped.

Looks like it will work!! I looked at the owners manual online and i can set the bandpass midbass/front subs to run as low as 40hz and can cut it off at 300hz, which should work! I also like the slopes on that unit, 18db/octave hipass and 36db/octave lowpass! thanks for the tip!! //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif