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Been having this question for a while...


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Doubling cone area roughly doubles your output (or increases by ~3dB).  Doubling your power roughly doubles your output (or increases by ~3dB).

In theory, a single 12 on 2000W or 2 12s on 1000W would be the same.  HOWEVER, due to a variety of factors, there will be differences.  Then we get into motor force per cone area, box size, porting size, cabin volume, etc etc and then it gets more complicated.

Chevy Sonic Wall (4) 15's on 10k Build Log

https://www.stevemeadedesigns.com/board/topic/209412-2015-chevy-sonicwall4-15s10klithiumlarge-case-hairpin-us-alts/

(4) Fi SP4 15's | (2) Ampere 5Ks | Active! | Arc KS600.2 & KS125.2mini | CDT Silk Domes | Silver Flute 8s | 240Ah JY | US Alts

Jeep Wrangler JK (4) 8's in a 4th Order Build Log

https://www.stevemeadedesigns.com/board/topic/209841-shadow-2016-jeep-wrangler-jk4th-order4-8sdc-35klarge-case-hairpin-us-alts/

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9 minutes ago, WalledSonic said:

Doubling cone area roughly doubles your output (or increases by ~3dB).  Doubling your power roughly doubles your output (or increases by ~3dB).

In theory, a single 12 on 2000W or 2 12s on 1000W would be the same.  HOWEVER, due to a variety of factors, there will be differences.  Then we get into motor force per cone area, box size, porting size, cabin volume, etc etc and then it gets more complicated.

Ok thanks im just thinking... ive ran 2 12s in my trunk forever and was wanting to get more lows didnt know if im better off sticking with 2 12s and changing tuning or if a single 15 would be better to achieve lower frequencys

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Are you running a sealed or ported box?  Maybe you can optimize what you already have.

Chevy Sonic Wall (4) 15's on 10k Build Log

https://www.stevemeadedesigns.com/board/topic/209412-2015-chevy-sonicwall4-15s10klithiumlarge-case-hairpin-us-alts/

(4) Fi SP4 15's | (2) Ampere 5Ks | Active! | Arc KS600.2 & KS125.2mini | CDT Silk Domes | Silver Flute 8s | 240Ah JY | US Alts

Jeep Wrangler JK (4) 8's in a 4th Order Build Log

https://www.stevemeadedesigns.com/board/topic/209841-shadow-2016-jeep-wrangler-jk4th-order4-8sdc-35klarge-case-hairpin-us-alts/

IG @walledsonic

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On 8/22/2017 at 1:50 PM, mike12 said:

Ok thanks im just thinking... ive ran 2 12s in my trunk forever and was wanting to get more lows didnt know if im better off sticking with 2 12s and changing tuning or if a single 15 would be better to achieve lower frequencys

You will most likely be better off with two 12"s vs one 15". 

What are the specs of the box?  Net volume and port area?
How much power are you running?

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