Type R - WTF?

[mikeyboc 10+ year member]

Man, I finally got everything in the car tonight, set my gains, took her out of the garage, and ultimate dissappointment.

I am running two Alpine Type R 12's (4ohm DVC wired to 2ohm) with 2 Alpine MRD-M605's (one each) in a sealed .995 cu ft box. I built the boxes and have 2 sheets of 3/4" MDF on the front to flushmount each sub (could this be he problem?) . I have the Amp rack (3/4" MDF as well) upright behind the back seats and the subs rear-firing. I don't seem to get the amount of bass inside the car I was expecting. I popped the trunk and the subs are moving pretty good, but nothing in the car. The amps are getting at least 13V ea when running, which should put out ~400-600rms @ 2 ohm. This is all in a 2002 Jetta. When the back seats are folded all the way down, the output is decent, but when up, it sounds very dissapointing. I was expecting much more out of this setup, and hopefully I have made a n00b mistake someone can help me out with.

Gains were set using DMM and headunit is Kenwood DDX7017 (I beleive it has 5V Preouts). Any help, advice, kick in the right direction would be greatly appreciated.

***.995 cu ft per sub *** just to straighten it out.

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[Silver 10+ year member]

port them.

 

[ntense702 10+ year member]

I'm guessing your box is the problem, Ive read that the r's are best ported

 

[mikeyboc 10+ year member]

I knew that was going to be the first response. I was hoping to keep the punchy sound of the sealed if possible.

 

[LoudCrownVic 5,000+ posts]

Bigger box?

Pull the stuffing out of the seats?

 

[Silver 10+ year member]

you'll still get a punchy sound if you port. just more boomy

 

[DiamondFanatic 10+ year member]

Make a baffle and fire the subs sealed directly into the back seat.

 

[mikeyboc 10+ year member]

I thought about the bigger box, but Alpine reccomends .7 cu ft, I built ~1.0 cu ft ea, if I have to go bigger, I should just port 1.25 and give up on the SQ?

 

[bigbangtheory 5,000+ posts]

Nope, something is got to be wrong with the way you built your box. To be honest sounds a little small to me. I have mine sealed at 1.75cft. Mine are very loud off of 1100 rms. So I would build a bigger box. I am doing a little over 140 on the tl at the dash. You could port them to make them louder but I dont think that is your problem. Wait till the tcab tunes in. Good luck!

 

[mikeyboc 10+ year member]

Do you really think turning them around into the car will make that much difference? I suppose it is worth a try.

 

[PhatTonyDeMarco 5,000+ posts]

Try some pollyfill, add a little at a time until you get the desired result....

 

[ntense702 10+ year member]

just have tcab make you a box and you'll be fine

 

[mikeyboc 10+ year member]

TCAB box . . . I here they are worth the money, but I don't want to mortgage my house and sell my kids for it.

 

[6three6mafia6 10+ year member]

interesting, i also got a pair dual 4 ohms and i got two wired down two 1 ohms, output is VERY quiet, i suspect this has to do with my set up and i will get to trouble shooting tommorow but this is interesting.

 

[mikeyboc 10+ year member]

I am beginning to think that it is only a box problem. What threw me off is popping the trunk and to see the R's moving a decent amount. I was expecting to see them barely flicker from what I was hearing.