building passive crossover

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albertr6

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Joined: January 11, 2006

Location: United States

Posted: January 09, 2011 at 2:24 AM / IP Logged

needing some help building a lowpass 400hz crossover. i have a 07 single cab silverado, and am using an alpine pdx5, with a jl 10w3, 6.5 kappa coaxials, and bought 2 jl 6w3 4ohm subs for midbass. im wanting to use the rear channels for 6w3 subs to have a range of 100-400hz. my plan is to set the amps xover to highpass @ 100hz, and according to the chart use a 1.59mhy coil for a 400hz filter with a 6db slope. im wondering if this would be a good way to reach my 100-400hz goal for my 6" subs. thanks for any advice or critisism.

i am an idiot

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Joined: September 21, 2006

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Posted: January 09, 2011 at 12:29 PM / IP Logged

Why not set your radio to 100Hz high pass and set your amp crossover to 400Hz Low Pass.

z03mz03m

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Posted: January 09, 2011 at 10:27 PM / IP Logged

Why do you want to set the high pass at 100 Hz? They are subs so why not just use the amp to low pass. Can't you switch the hp lp on the 4 channels? ...looking at pictures ...yes you can and it looked like 40- 400 Hz so just low pass them at 400.

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albertr6

Member - Posts: 5

Joined: January 11, 2006

Location: United States

Posted: January 10, 2011 at 1:54 PM / IP Logged

thanks for your advice, i forgot to list my h.u, its a jvc hd69 that only has front, and sub outs, but doesnt have an internal crossover. have you used those fmods by harrison, wondering if youve heard of any problems with those? thanks again!

albertr6

Member - Posts: 5

Joined: January 11, 2006

Location: United States

Posted: January 10, 2011 at 2:00 PM / IP Logged

thanks for your reply mr z03. the subs are only 6" (now i want some subway) and im using them for my midbass only between 100-400hz so idint want anything lower than that to get to them. thanks for your advice though.

DYohn

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Posted: January 10, 2011 at 2:04 PM / IP Logged

Passive high-passing at 100Hz requires large and expensive capacitors so I also recommend using an amplifier crossover or better yet an external crossover that you can set to bandpass your desired 100-400Hz band. I assume you have other subwoofers to handle the frequencies below 100Hz? And how did you determine that 100-400Hz is a good band for those speakers? How are you high-passing your mains above 400Hz?

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albertr6

Member - Posts: 5

Joined: January 11, 2006

Location: United States

Posted: January 10, 2011 at 2:24 PM / IP Logged

thanks mr DYohn, i have a 10" sub for the 40-100hz range, and some 6.5 coaxials for the 400hz on up which are pretty bright. the 6" subs i decided to dedicate them as the 100-400hz range so that i can hear and feel the bass and toms from my music prefrence. have you tried the f-mods that go into the amp inputs? they are only about $20 and might try those. thanks again!

z03mz03m

Copper - Posts: 244

Joined: January 09, 2010

Location: Delaware, United States

Posted: January 10, 2011 at 6:12 PM / IP Logged

I think you need to take a look at how to achieve awesome midbass. I haven't read it for a while my self and just re-learned some very useful things building passive crossover -- posted image.

building passive crossover -- posted image.

....off to my post...

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Pioneer DEH-80PRS - PPI Amps - Dayton Subwoofer(s) - Exodus Anarchy's - Vifa Tweeters - Kinetik Battery

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building passive crossover

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