12" or 15" with PRs.. Can't decide - diyAudio
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Old 18th April 2013, 10:31 PM   #1
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Default 12" or 15" with PRs.. Can't decide

So I have a bit of a dilemma... I can't decide whether I should go with 12 inch or 15 inch. Here's my setup so far to get better insight of what my goals are:

This is in a 2004 Toyota Corolla
Alpine INA-w910
Alpine PXA-H800
Rainbow Germanium 6.5 front stage.. (ripped out the 6x9's in the back)
running it on an old Rockford Fosgate 500X4
I have an Audioque 2200.1, and I'm dead set on buying the Fi Q subwoofer to pair with it.

It will be in a passive radiator box because honestly I like ported better but I don't wanna give up too much space. So I decided to go with this setup because it will be the best of both worlds.

My question is should I go with a 12" or 15"? I listen to mostly Hip-hop, R&B, Trance, and sometimes Dubstep. Will the 15 be a better choice because of the cone space? or will the 12" be better overall? I'm really aiming to get the best SQ but in the same time, I gotta have my bass. Maybe the Fi Q 12 is good enough to push enough air to get that full effect without compromising the quality of the bass.

If I go with 12", I will put two 15" TC sounds passive radiators.
If I go with 15", I will put two 18" TC sounds passive radiators.

it's going to be in a perfectly cubed box.. passives facing sideways. sub facing trunk.

Sound deadened my whole car with Second Skin Damplifier Pro mostly.

Currently I have two 12" Diamond audio D6's in a sealed box.. running 4 gauge.. with yellow top battery in the front. Will be upgrading to 0 gauge.. and doing the big 3 and upgrading my alternator.

The setup I have right now is cool and all but very lacking in the low end and isn't enough power for me.

Any input will be appreciated.. Thank you
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Old 19th April 2013, 05:47 AM   #2
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Join Date: Feb 2006
Location: Cascais
Hi icecreamxd,
Look at this two possible alignments for your car.
2004 Toyota Corolla
(3m³ = 105.94ft³)
Car gain: 11.00 dB/octave < 60Hz

1a. Fi Q12 DUAL 2: VB = 12.0 L, FB = 30.0 Hz ~87 dB
2a. Fi Q15 DUAL 2: VB = 36.0 L, FB = 26.0 Hz ~90 dB
(blue line = w. car-gain, red = far field)

You will need lots of (KWs) power to move this drivers.
Note: This is just a simulation of two possible alignments doesn't mean they are the best. I don't know the crossover you are using, following all those infos you might need different set-up (alignments/enclosures). As you see this gives a flat (alignment) output curve when you consider the gain from the car cabin what possible is or isn't interesting when you consider max. SPL levels, I don't know (haven't the experience with auto-audio).

An ideal (home) alignment for comparison, for the two same drivers:
1b: VB = 19.5 L, FB = 29.5 Hz
2b: VB = 72.8 L, FB = 24.5 Hz

F3 for the 15" is ~6/8 Hz lower in frequency comparing with the 12".
If you use this alignments in your car (peaks @30Hz/12" and @22Hz/15") you can crossover the subwoofers @~50/60 Hz for the 12" and @~40/50 Hz for the 15". It all depends if you are using the subs above the 60 Hz frequency or not (peaks and deeps or providing EQ). Have fun.

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Last edited by Inductor; 19th April 2013 at 06:01 AM.
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Old 19th April 2013, 05:51 AM   #3
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1b and 2b (with car-gain).
Attached Images
File Type: jpg 1b. Fi Q12 DUAL 2.jpg (54.0 KB, 51 views)
File Type: jpg 2b. Fi Q15 DUAL 2.jpg (54.3 KB, 51 views)
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