High / Low Pass filter Question

[Haro]

Hi people,

I have installed a 4ch amp into my car and it is an Old School one that a friend just gave to me and seems to work rather well and am very happy with it. However, I want to add a sub as the ol 4" splits and 6" in the back dont offer me enough kick. I have a 15" JL Audio Sub that i had in my last car and i want to use it as i couldnt stuffed buyin another one.

MY plan is to run 2ch bridged into sub and other 2 running my splits. 6"s will run off my head-deck.

Question : Because the Amp is OLD it does not have a high low pass switch on it, and i am wondering if anybody has heard of a High Pass Filter that is available that i could use for my sub (much the same way as the cross overs work for my splits) ??

Does anybody have any ideas?

Appreciate any feedback !

Cheers

HAro

[drunkenmaster]

you would want a low pass filter for your sub, not high pass.

jaycar had kits where you can build your own passive HP/LP filter quite cheaply and very easliy, i assume they still do.

[igor]

First, you need a low-pass filter for the sub (the one that lets the low frequency through). I am pretty sure if you go to any car audio place they ll be able to get you a stand alone filter. I would also recommend high-passing the speakers as well. This will allow the speakers to be much louder in treble and midrange.

Alternatively you can construct your own filters from a coil and a capacitor. You will need to research how to do this to get good sound quality. I made a set of high-pass filters for my 4" speakers and the result was awful, the bass filtered out but the distortion was pretty bad. This however will probably work on a low pass filter since the distortion is mainly in trble.

Go to your audio store and i am pretty sure they ll help you.

[igor]

jaycar had kits where you can build your own passive HP/LP filter quite cheaply and very easliy, i assume they still do.

Thats the one i made.

[Haro]

Low pass hey?

Sounds like a plan, i will roll out to a Jay car over the next few days, these forums are tops for gettin some answers quickly.

Thanks Guys, now all i have to do is organise a time to pull apart all my "install" and get into it!

Cheers

Haro

[Haro]

OK... Done like a dinner !

The low pass filter from Jay Car was about $30 so thats ok. Didnt have to build it or anything, just bought it off the shelf. Works a treat. Now i just have to work on that bloody engine whine noise that soo many people get. I think i just will try a better amp.

Thanks for your help people.

HAro

[drunkenmaster]

There was a thread a week or two ago on noise, try some of the stuff suggested in there.