Band Pass filters???

Printed From: the12volt.com
Forum Name: Car Audio
Forum Discription: Car Stereos, Amplifiers, Crossovers, Processors, Speakers, Subwoofers, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=10759
Printed Date: July 29, 2025 at 4:26 PM

Topic: Band Pass filters???

Posted By: Demick
Subject: Band Pass filters???
Date Posted: March 11, 2003 at 5:20 PM

Ok in the below diagram what kind of Capacitor should i use to hook up my MB Quort 8"'s??

Band Pass filters allow a range of frequencies to pass above a selected crossover frequency and below another selected crossover frequency, filtering out all frequencies outside this band. In a first order (6dB per octave) filter, this consist of a low pass filter (coil) and a high pass filter (capacitor) in series with a loudspeaker. Narrow Band Pass Filters are to be used when the bandwidth is less than two decades.

Replies:

Posted By: Demick
Date Posted: March 11, 2003 at 5:21 PM

oh yea and what type of coil?

Posted By: CorradoG60
Date Posted: March 11, 2003 at 5:40 PM

Well it really depends on some of the Drivers T/S Prameters. Like Le, Re, and what frequencies you want for the slopes. You have to remember that the Coil in a Bandpass filter hast be higher freq cut off, and the Capacitor needs to be the Lower cut-off freq.

Example, if you want to pass say 180Hz - 4000Hz. You will want a Coil pass up to 4000hz, then a Cap that will pass freqs. above 180Hz.

What model MBQ 8" do you have.

-------------
The FLUKE Guy.

Posted By: bdl666
Date Posted: March 11, 2003 at 5:44 PM

What frequency for the low pass and high pass. And take into consideration that the components are not going to be cheap. And also once you choose the frequency for both unless you buy different parts there is no way to change it.You can find the right values for the coil and capacitor here

Posted By: Demick
Date Posted: March 11, 2003 at 5:58 PM

My 8"'s MBQ's are QM 200.92 SUB

Max power 125W Independace 6 Ohms

Frequency Response 20-400Hz Sensitivity 1.4W 90 dB/ 1n

They are on my rear deck open air

-------------
Peace