• WANTED: Happy members who like to discuss audio and other topics related to our interest. Desire to learn and share knowledge of science required. There are many reviews of audio hardware and expert members to help answer your questions. Click here to have your audio equipment measured for free!

Good values for HPF/LPF in car

gabrielb

Member
Joined
Jul 7, 2024
Messages
44
Likes
10
My car has the Infinity Primus 1270 Subwoofer (35Hz - 200Hz) and a pair of front component speakers Infinity Kappa 603CF (35Hz-40KHz).
The amplifier LPF/HPF uses 12 dB/octave slope.
What values should I use for the SUB and component?
I read that 80 HZ is a good starting point for the LPF, does it mean I need to set the HPF for the same value (80Hz) or so I need to leave a gap to accommodate for the slope?
 
What values should I use for the SUB and component?
Do a measurement sweep of the 603CF and see how low they like to play before THD skyrockets. Then set the HPF slightly above that.

I read that 80 HZ is a good starting point for the LPF, does it mean I need to set the HPF for the same value (80Hz) or so I need to leave a gap to accommodate for the slope?
An ideal crossover filter will have the two speakers meet at -6dB.

Whether you'll have to leave a gap depends on the crossover implementation really.
Again, do a sweep and see what results in the smoothest response.
 
Last edited:
Do a measurement sweep of the 603CF and see how low they like to play before THD skyrockets. Then set the HPF slightly above that
An ideal crossover filter will have the two speakers meet at -6dB.
Do a measurement sweep of the 603CF and see how low they like to play before THD skyrockets. Then set the HPF slightly above that.
How do I test this?
Should I play a flat frequency and see how clear it is?


An indeal crossover filter will have the two speakers meet at -6dB.
So in my case with a dB/octave slop I should start with one octave gap between the LPF and HPF?
 
How do I test this?
Should I play a flat frequency and see how clear it is?
Use Room EQ Wizard's default measurement sweep and close-mic the drivers for cleaner data.
 
Back
Top Bottom