Would you do this?

[86yota 10+ year member]

OK heres my dilemma. 1st of all, I know I should get all matching VC subs, but im working with what I got. I have 4 12" D2s and 2 D4s. They are all wired to 1.6 ohm right now, but the problem is with box rise and what not, im gonna be at like 2 ohm, meaning Im limited to amps to do the power I need. Im wanting to run the new Crunch GP amps, and I was thinking about putting a 2500D on the 4 D2s (wired to 1 ohm), then the 1000 watt or 1500 watt on the 2 D4s (at 1 ohm). I would set the gains so that all 6 subs are receiving the same amount of power, or as close as possible, to prevent cancellation. How bad of an idea is this? The subs are all in a common chambered ported box.

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[cshaw 10+ year member]

why would there be any cancellation just because of two different amps? there wouldt be any cancellation. and why would you set both amps gains to the same? just set them with a dmm and be set. never heard of box rise, dont you mean impedance rise?

 

[mile098 10+ year member]

i wouldn't put them in a common chamber box if theyre not on the same amp

 

[btdickey99 5,000+ posts]

OK heres my dilemma. 1st of all, I know I should get all matching VC subs, but im working with what I got. I have 4 12" D2s and 2 D4s. They are all wired to 1.6 ohm right now, but the problem is with box rise and what not, im gonna be at like 2 ohm, meaning Im limited to amps to do the power I need. Im wanting to run the new Crunch GP amps, and I was thinking about putting a 2500D on the 4 D2s (wired to 1 ohm), then the 1000 watt or 1500 watt on the 2 D4s (at 1 ohm). I would set the gains so that all 6 subs are receiving the same amount of power, or as close as possible, to prevent cancellation. How bad of an idea is this? The subs are all in a common chambered ported box.

There will be cancellation if 2 different amps are used that give out different power as well as 2 different sets of vc config

why would there be any cancellation just because of two different amps? there wouldt be any cancellation. and why would you set both amps gains to the same? just set them with a dmm and be set. never heard of box rise, dont you mean impedance rise?

this statement is not true and should be deleted so that it doesnt give others such false information

 

[86yota 10+ year member]

Yes impedence rise, its caused by the enclosure, and its often referred to as box rise. And it would be cancellation if all 6 subs are not getting equal power, say the 2 d4s are getting more power, they would be moving and being pushed differently. And in the same chamber, would cause cancellation

 

[86yota 10+ year member]

You guys beat me to it. Well the box is already built, and I dont really want to build another. So is this a TERRIBLE idea, or what?

 

[maldecido33 10+ year member]

Terrible idea, you'll potentially damage the subwoofers, it won't sound too hot. I'd just try and sell the D2 subs and replace them with d4 subs.

If you have two amps powering subs that are all in a common chamber, you better use an o-scope or some other type of precision voltage measuring device to gain match those amps.

 

[mokedaddy 5,000+ posts]

It should work but probably wouldnt be ideal.

What kind of vehicle are you trying to cram 6 12s into?

 

[86yota 10+ year member]

I have a Grand Marquis. 9 cube box, ported to 35hz, with 140sq of port area. So would my best bet to just be sell the d2s, buy more 4 d4s, and I beleive they will all wire down to 1 ohm? Right?

 

[mokedaddy 5,000+ posts]

6 12s in a 9 cu ft box? is that after displacement I hope? In a wall or in the trunk?

 

[86yota 10+ year member]

Before displacement, and in a trunk. I know its not enough..but its what I got.

 

[maldecido33 10+ year member]

Do it right the first time instead of wrong five times, only to do it right the sixth.

 

[mokedaddy 5,000+ posts]

Before displacement, and in a trunk. I know its not enough..but its what I got.

If you know its not enough space and you will lose output why would you even consider it?

Four 12s will be louder, sound better and most likely look better.

Or two fifteens.

 

[twisztdauthorit 10+ year member]

i wouldnt do it

 

[86yota 10+ year member]

Dont tell me what will be louder or how to build my system, Ive had 4 12s, and 2 15s, and 3 10s, and 1 12, and now I want to do 6 12s. I asked about how to amp them, not how many I should own or install. Kthxbye. Thanks for the help so far guys, Im prolly just gonna resell and get 6 D4s.