want to down size, 12'' woofers

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rlemere

Member - Posts: 8

Joined: May 11, 2009

Location: California, United States

Posted: May 11, 2009 at 8:58 AM / IP Logged

Hi everyone, I am a newby here so be easy. I recently bought a 2007 Ford Expedition and it came with a sub box with 3 Polk / Momo MM2124DVC woofers. The box measures 47.5" W x 11" D x 14" H, They are in a custom built box that runs across the back end of the SUV and I would like to either have one 12" sub on each side in a wedge type box or was thinking of building a sub box for two 12's to sit in the middle of the floor next to the 2nd row of bucket seats.

The current box is around 2.2 c.f. with 3 subs and the one I am considering to build is around 1.5 c.f. My question is will this smaller cubed box work for two 12's? I have a Polk C-500.1 Carbon Series amplifier running the bass and it hits hard and loud like I like it. Thanks in advance for the advice and or help

Roger

vibrationcustum

Copper - Posts: 171

Joined: April 05, 2009

Location: Michigan, United States

Posted: May 11, 2009 at 9:46 AM / IP Logged

box is to small for even one of the speakers.

here is the specs for one sub

Recommended Enclosure Sealed / Ported / Bandpass

Resonant Frequency 31 Hz

Qms 6.06

Qes 0.61

Qts 0.55

Vas 2.249 cu.ft. / 63.71 L

Sd 80.4 sq.in. / 518.7 sq.cm.

Xmax (linear) .37 in. / 9.5 mm

Xmax (mechanical) .75 in. / 19 mm

Le 2.29 mH

but if you give me LxWxH between the seats I make you something for the 2-12' let me know.

Can't be loud then don't have it.

(power acoustik system)

Head unit- TID-896 7" TOUCHSCREEN

ovn1-5500d 09 and another one coming soon

4-12" mofos 12ft3 box to 40hz (wall)

2 batterys, 1 power

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rlemere

Member - Posts: 8

Joined: May 11, 2009

Location: California, United States

Posted: May 11, 2009 at 3:08 PM / IP Logged

Thanks for your input, what if my dimensions of the box were 24" W x 14" H x 11" D? That is what I have started with, would it work if I go with the Isobaric method? This is something I can build just need help with the size.

Roger

vibrationcustum

Copper - Posts: 171

Joined: April 05, 2009

Location: Michigan, United States

Posted: May 11, 2009 at 4:05 PM / IP Logged

well if you want to put them between the seats I got something the I can design if you want them there. Just need to know LxWxH want to down size, 12'' woofers -- posted image.

want to down size, 12'' woofers -- posted image.

this will hold 2 subs

Got the design done with a stealth look to it. No one will see the subs but will hear you and you will have the full back for things.

Can't be loud then don't have it.

(power acoustik system)

Head unit- TID-896 7" TOUCHSCREEN

ovn1-5500d 09 and another one coming soon

4-12" mofos 12ft3 box to 40hz (wall)

2 batterys, 1 power

rlemere

Member - Posts: 8

Joined: May 11, 2009

Location: California, United States

Posted: May 12, 2009 at 12:31 AM / IP Logged

Dimensions are in my second post, would isobaric work with this dimension?

vibrationcustum

Copper - Posts: 171

Joined: April 05, 2009

Location: Michigan, United States

Posted: May 12, 2009 at 11:44 AM / IP Logged

I dont thank so because it is still using the same air space but there is one why to find out is to do it.

ok there are 2 of the first one is the stealth design and the out dims are 24w x 14h x 30d with a port of 1.5 wide so if you have room each sub is tuned to 35hz and 1.5ft^3per side and no one see what you got.

number 2 simple but that the dims are that you gave me it would have to be sealed or the port will go into the seat.

need any more help let me know

Can't be loud then don't have it.

(power acoustik system)

Head unit- TID-896 7" TOUCHSCREEN

ovn1-5500d 09 and another one coming soon

4-12" mofos 12ft3 box to 40hz (wall)

2 batterys, 1 power

aznboi3644

Gold - Posts: 2,600

This member consistently provides reliable information

Joined: May 01, 2006

Location: United States

Posted: May 12, 2009 at 12:14 PM / IP Logged

middle row is no optimal for cabin loading...but if you must than there is no choice

Custom Enclosure Design

vibrationcustum

Copper - Posts: 171

Joined: April 05, 2009

Location: Michigan, United States

Posted: May 12, 2009 at 12:39 PM / IP Logged

I am just the designer, just asked me to make something to the specs that I got. With that truck it would he hard to cabin load with the subs anyways so if he would want really hard bass he would have to upgrade anyways. I might be wrong but I thank he is looking for a bump but not to take up so much room in the truck. Both boxes and even the box that he has now is to small for the subs. Who knows

Can't be loud then don't have it.

(power acoustik system)

Head unit- TID-896 7" TOUCHSCREEN

ovn1-5500d 09 and another one coming soon

4-12" mofos 12ft3 box to 40hz (wall)

2 batterys, 1 power

aznboi3644

Gold - Posts: 2,600

Joined: May 01, 2006

Location: United States

Posted: May 13, 2009 at 12:51 AM / IP Logged

Yeah...IMO best way to load the subs/enclosure is downfiring with the port firing down if there is enough room to port.

Custom Enclosure Design

rlemere

Member - Posts: 8

Joined: May 11, 2009

Location: California, United States

Posted: May 13, 2009 at 11:13 AM / IP Logged

Thanks for the info guys, not sure what is cabin loading? I am just looking to move my subs to open up the back of my SUV. My current box blocks the access in the rear with the 3 12's in it. Vib you said that my current box is not the correct sixe for these woofers? It measures 47.5" W x 11" D x 14" H and does sound really good to me. C.F. on that box measures 2.212. I would like to do this once and have at least close to the amount of bass I currently have. I suppose it would be best to downgrade to 2 10" woofers for the size box I want to put in the middle console? I would like to stick to the smaller dimensions and could seal the box (second pic) Would the woofers have to sit on top of the box or could I put one in front and one in back?

Even if I had to only run one 12" sub that would be okay, but I was under the impression that the more woofers you have the harder they will hit?

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