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Old 24th March 2009, 15:58   #1
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Default Help with DIY 3 way speaker setups for fronts

I was checking out techno's plans to set up a three way speaker config in his alto. I've had this bug for the longest time, since the indica has stock 4" locations anyway.

I have a pair of 5" comps, planning to make it 3 way by adding a 4" coax ( fed with a BPF signal/else with its tweeter disconnected) in the dash.

are there any easier alternatives ?

PS: the conversion will have to be totally passive. I dont have a fancy HU or an amp

Last edited by greenhorn : 24th March 2009 at 16:00.
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Old 24th March 2009, 16:44   #2
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Greenhorn i was supposed to do a 3 way myself. The easiest way is adding a 4" coax.

Thanks to Gunnu Paji I almost added the KX series 4" coax but then came to know they won't be covered by the stock grill and then gave my own thoughts on it and came to a conclusion the tweet frequencies on the coax will reflect due to the windshield.

P.S. To do the above i was removing my current compos tweets.
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Old 24th March 2009, 17:01   #3
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i think the compos tweets should be better than the coax tweeters ( if they are from the same range - I'm planning dieci coax).

will need to give the crossover design some more thought...
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Old 24th March 2009, 17:36   #4
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GreenHorn which HU do you have?

Also are you willing to loose speakers at rear?

You can simply put a 2 way 4 inch speaker in dash, give it the front speaker out & a 6/6.5inch coax speaker in door give them rear speaker out
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Old 24th March 2009, 17:41   #5
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Quote:
Originally Posted by technocrat
a 6/6.5inch coax speaker in door give them rear speaker out
this one's got the tweeter,dude. It'll be more highs.
I feel this kind of a setup would be quite a raw 3 way.
A 3 way should properly have 3 items working on 3 different frequency bands.
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Old 24th March 2009, 17:47   #6
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Well if the HU has separate hpf & Lpf then this can be taken care of. I belive some new low priced Kenwoods have this feature.

Other wise its difficult if there is no XO &/or independent front & rear hpf/lpf controls.
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Old 24th March 2009, 17:57   #7
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mine is an alpine 9870. it has an HPF for the speakers , and an LPF for the sub, and one pre out. Thats it. both these can be set to 60/80/100/120/200.
that't it :P

I dont mind sacrificing the rears , but I dont think there is a need yet.

either way, cant afford a new amp or an HU, and I dont mind making my own passive crossovers.

The dieci's come with seperate crossovers for the woofer and tweeter, and the manual mentions the values of the components used in them. so was planning to make a replacement LPF for the woofer with a lower LPF ( use a bigger inductor instead) , use the tweeter with the stock LPF, and use a 4" coax ( with the tweeter neutered ) , and for the neutered 4" coax, either a BPF , or use an HPF alone , and use its natural HF roloff ( like is used in 3 way 6x9's )

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Old 24th March 2009, 17:59   #8
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You could set LPF/HPF @ the amp too.
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Old 24th March 2009, 18:09   #9
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my amp is a 2 channel for the sub alone. and its filter is fixed at 80hz. and my HU doesnt have any extra pre outs, and dont want to add an amp, or anything costly - want this to be a cheap, DIY upgrade !

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Old 24th March 2009, 18:09   #10
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I'd suggest you to first get a 6.5" midbass driver before you go ahead.
5.25" midbass with a 4" coax as midrange in a 3 way setup will sound inadequate in my opinion. Surely, I haven't heard something like this but this is my pure assumption.
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Old 24th March 2009, 18:12   #11
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Quote:
Originally Posted by greenhorn View Post
my amp is a 2 channel for the sub alone. and its filter is fixed at 80hz. and my HU doesnt have any extra pre outs, and dont want to add an amp, or anything costly - want this to be a cheap, DIY upgrade !
Get hold of an LCR meter and start making the crossover

Good luck!
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Old 24th March 2009, 18:19   #12
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Quote:
Originally Posted by speedzak View Post
I'd suggest you to first get a 6.5" midbass driver before you go ahead.
5.25" midbass with a 4" coax as midrange in a 3 way setup will sound inadequate in my opinion. Surely, I haven't heard something like this but this is my pure assumption.
Even better, an 8" woofer! Yeeaaaah, baby!
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Old 24th March 2009, 18:37   #13
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Quote:
Originally Posted by nitrous View Post
Even better, an 8" woofer! Yeeaaaah, baby!
I wish my door panels would co operate

I think I'll add the 4" ers to the dash first, then upgrade the woofers later. I run them quite HPF'ed anyway, so no point going overboard, and remember that I'm mounting them on the plastic door panels.

I'm adding the 4"ers in the dash since i want a bit more prescence in the front
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Old 24th March 2009, 19:49   #14
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I think the basic idea of Technocrat's proposed setup is what is most workable.

Since you plan to not use another HU or add an amp, we will have only 4 channels of amplification (from the stock HU) to work with. Which means you will have to use two channels for a pair of midbasses (so that they get the most power) and two channels for feeding the mids & the tweets.

Quote:
Originally Posted by greenhorn View Post
... planning to make a replacement LPF for the woofer with a lower LPF ( use a bigger inductor instead) , use the tweeter with the stock LPF, and use a 4" coax ( with the tweeter neutered ) , and for the neutered 4" coax, either a BPF , or use an HPF alone , and use its natural HF roloff ( like is used in 3 way 6x9's )
I think the basic idea you've mentioned in your post (quoted above) is pretty much workable IMHO, if you can manage to DIY a bandpass filter for the mids.

But then, you will definitely lose the rears. Please don't power the midbass, the midrange & the tweeter, all with one pair of channels of the HU and use the other pair of channels to power the rears. You wouldn't get the benefits of the 3-way setup in front at all.

And as Zak said, a 6" or 6.5" driver in front would be the next step in getting the most out of the setup.
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Old 24th March 2009, 20:19   #15
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hydra, I'm planning to run a similar setup as most three way ovals do.

In them, the woofer is not filtered at all, and the mid is just HPF'd, and the tweeter also just HPF'ed. If the HU can drive the 6x9's, then i imagine it shouldnt have issues driving this setup. either way, only way to see it to try and find out
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