1 sub vs 2 subs?

[Dirtrider4eva]

I have 2 15" RE XXX '05 era.
i have 7.5 cu feet on tap to play with.
now for IDEAL specs, these each want 8 cu feet.
but many run this around 3-3.5 tuned to 30-34 hz.
would i be better off putting two in the enclosure, or 1?
im looking to maintain their SQ, while still getting loud for what they are.
will have them on 2k dailly.
itd be in a hatch, and this box will take up the whole trunk, so itd be subs up, port to cabin.
the seats will be folded down for the most part.
would aero ports be best used?
btw, resonant frequency of the car is 49hz

[09civic]

I suggest having the port load off one of the sides of you trunk. Not straight into your cabin.

[Dirtrider4eva]

there would be no room for air movement. box would run right along the grey supports for the top tray, (which would be taken out)

[09civic]

there would be no room for air movement. box would run right along the grey supports for the top tray, (which would be taken out)

Even better...

[Dirtrider4eva]

For ported? Not really. Ideally 5-6" would be best. Bump

[keep_hope_alive]

I vote one, port close to cone for good coupling.

[brynm]

Use one, sell me the other.

[brynm]

Where did you come up with the 8 cube number? I thought these were more in the range of 3.5-4.

[Dirtrider4eva]

I vote one, port close to cone for good coupling.

Explain this coupling please, I know you know your stuff very well.

[Dirtrider4eva]

Where did you come up with the 8 cube number? I thought these were more in the range of 3.5-4.

If you put them in winisd or call re audio, they will tell you that. Also, I got a d4 and d1, d4 is original soft parts, d1 has new Fi recone.
Shoot me an offer if ya want on one.
Has to do with the xbl^2 motor structure. Almost every sub I know with tht motor type likes huge cubic boxes.

[keep_hope_alive]

Explain this coupling please, I know you know your stuff very well.

A port works by combining the rear wave with the front wave, but after a period of time/distance so the two are in-phase. That is why you gain 3dB.

Waves combining in-phase is what I call "coupling". If the port and cone are separated by a distance, they will create separate waves with separate centers, the coupling will not be coherent at some frequencies.

[Dirtrider4eva]

A port works by combining the rear wave with the front wave, but after a period of time/distance so the two are in-phase. That is why you gain 3dB.

Waves combining in-phase is what I call "coupling". If the port and cone are separated by a distance, they will create separate waves with separate centers, the coupling will not be coherent at some frequencies.

so ideally, the woofer should be right over/closest to the ports outlet or inlet?

[keep_hope_alive]

so ideally, the woofer should be right over/closest to the ports outlet or inlet?

yep.

boxes with ports on different faces are missing the point entirely, IMO

[kushy_dreams]

yep.

boxes with ports on different faces are missing the point entirely, IMO

By this you mean sub up port to the rear or sub back port to the side? Or do you mean a box with multiple ports that fire to both sides?

[keep_hope_alive]

By this you mean sub up port to the rear or sub back port to the side? Or do you mean a box with multiple ports that fire to both sides?

Yes to all.