Have an amp, need to choose a suitable sub.


CarAudio.com Newbie
Aug 5, 2019
Houston tx
Hello all, yes this is going to sound very noob.. and I did read the sticky but not sure how else I'd pose this Q!

I posted this in a few other places with no feedback, so really hoping someone here can help!

So I have the Boss PT2200 amp, these are the specs:

2200 W MAX Power 2 Channel
825 W X 2 RMS @ 2 ohm
413 W X 2 RMS @ 4 ohm
1650 W X 1 RMS Bridged @ 4 ohm

I plan on running one sub, bridged.

Narrowed it down between the Rockville K9 10′’, or the K9 12″. I’d like to power either of these subs somewhere below their claimed RMS capability.

K9 10:

  • Rockville W10K9D4 K9 Series 10" Dual 4-Ohm Car Subwoofer

  • Peak Power Handling: 3200 Watts

  • Program Power Handling: 1600 Watts
CEA Rated RMS Power Handling: 800 Watts

K9 12:

  • Rockville W12K9D2 K9 Series 12" Dual 2-Ohm Car Subwoofer

  • Peak Power Handling: 4000 Watts

  • Program Power Handling: 2000 Watts

  • CEA Rated RMS Power Handling: 1000 Watts
Iv’e been told not to expect anywhere near the claimed RMS output from the amp (1650 bridged), so how much less could it actually be? 1200, 1000, 850?

EDIT: The amp has TWO 25 amp fuses, so tell me (please!) if one of these formulas is more correct than the other:

25amp x 2 = 50 x 14.4v = 720 rms or 25 x 2 = 50 x 10= 500 rms

And what does that mean in the bridged configuration? Is that formula representing bridging?

Which of these subs do you think might pair best, and how would you configure the sub wiring?

Finally, would this setup warrant upgrading my alternator? Stock Alt. is 70 amps and the headlights already dim a little bit when the heater fan is on high power. The only high output alt I've found is 160 amps. Not really sure how high I'd need to go.

Thank you to any experts who can take the time to weigh in on this!

Product links:

PT2200 - Boss Audio Systems

Rockville W10K9D4 10" 3200w Car Audio Subwoofer Dual 4-Ohm Sub CEA Compliant

Rockville W12K9D2 12" 4000w Car Audio Subwoofer Dual 2-Ohm Sub CEA Compliant
Whatever you do stay away from power!!!!!

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