Rockford dual 12" Power HX2 enclosure???

[valin 10+ year member]

Stats:

2008 Toyota Tundra doublecab

Two Rockford Fosgate Power HX2 12"

Memphis Mojo MC-2000d amplifier

I don't like these drivers in the sealed, downfiring enclosure I am running. I have them in 1.0 cubes per driver after displacement, and they sound like crap. I find the output isn't anywhere near where it should be, and it rolls off on the lows real bad.

Rockford's recommended ported enclosure (per driver) is:

- 2.5 cubes (although they give a range of 1.75 to 4 cubes)

- two 4" round ports, 12.65" long

- tuned @ 40hz

25 sq. inches of port area per driver does not sound like it's enough to me. I have an old box that I used to run that I am going to use. It's 6.03 cubes internal, and measures 20"x13"x50.5", so I have 5.78 cubes available after driver displacement, but I could shrink it if you think it should be smaller. I was thinking about running drivers and ports facing forward, on the 13" face. I happen to have quite a few 6" Aero Ports laying around that I have available to use.

Questions:

- How far off the back wall does a 6" Aeroport have to be? I was thinking the distance should be 1/2 the diameter of the port. Is that right? In this case, it would then be 3", and would allow me to run 16.25" of port length, flare to flare.

- How big should the enclosure be for a daily setup with decent SPL?

- How much port area should I run? Where do these drivers like to be tuned?

The help will be much appreciated.

Tha Drivazzzz:

Click to read more...

 

[thegreatestpenn 5,000+ posts]

they aren't supposed to be sealed, says it in the manual IIRC.

the RF box recommendations are okay, but 2cu.ft. tuned to 35Hz per driver would be awesome with 32sq.in. of port per sub

 

[valin 10+ year member]

If I were to shrink it to 4 cubes, and run two 6" aeros, how long would they have to be to tune it to 35, or 32 even?

What about slot port length?

 

[ThatChevyGuy 5,000+ posts]

You need more port than two 4".

 

[valin 10+ year member]

According to this calculator, using a slot port, I would need a port length of 25.5", with 63 sq. inches of port. I am assuming this is correct.

 

[valin 10+ year member]

You need more port than two 4".

I edited it to 6". the 4" ports was a typo.

 

[rotciv005 10+ year member]

pics of the 2008 tundra??

 

[valin 10+ year member]

 

[thegreatestpenn 5,000+ posts]

2 6" ports in a 4 cu.ft. box would be very long tuned that low

 

[valin 10+ year member]

This is not mine, but nearly identical. My grilled surround is colour matched white, and the emblem is painted black. I am about to run the same wheels, but 18", but they're not on yet because my tires are on backorder for another 4 weeks (Goodyear Duratracs 325/65r18).

 

[valin 10+ year member]

2 6" ports in a 4 cu.ft. box would be very long tuned that low

I'll just throw a slot port in there then. It'll be easier. Subs and port will be facing forward, with the box just sitting on the back seat. The box is 50.5" long. Should I place the port on the drivers side, or passenger side?

 

[valin 10+ year member]

Ok. I decided to go 4.5 cubes after displacement, slot ported, with 65 sq. inches of port, tuned to 35 hz. Hopefully this works out. I built most of the enclosure tonight. I'll finish it up tomorrow.