newbie!!. Please help me tune my amplifier

[k1ng440]

Hello,

i am totally newbie to car audio. i have never mess with any car audio before. i have managed to get some stuff together and set them up but i require your help to tune them with DMM or something i can find in Bangladesh

here is the stuffs i have

Head Unit:

Name: Pioneer AVH-P4450BT

URL: AVH-P4450BT 7" in-car DVD player with Bluetooth, iPod/iPhone Control, Rear USB and Aux-in - Pioneer Car DVD Player, Screens

Specs: AVH-P4450BT Pioneer - Car DVD Player, Screens - Car*Entertainment

Speakers:

Toyota OEM (head unit amp)

AMP:

Name: Alpine PDX-M12

URL: Alpine Electronics of America, Inc.

Specs: Alpine Electronics of America, Inc.

Subwoofer 1:

Name: Rockford Fosgate P1S412

URL: Rockford Fosgate P1S412 Punch Stage 1 12" 4-ohm subwoofer at Crutchfield.com

Subwoofer 2:

Name: Rockford Fosgate P1S412

URL: Rockford Fosgate P1S412 Punch Stage 1 12" 4-ohm subwoofer at Crutchfield.com

i have seen a lot of video and tutorial how to tune amplifier but i am really confused about the calculation of the sqrt(RMS*ohms).

if you give me the calculation it would be awesome...

Thanks

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