Understanding Ohm's law and wattage

[travisr1988]

Ok, so I'm new at this forum, I have a 79 chevy c20, I'm adding subs to it, my subs are 8 ohm kenwoods rated at 175w rms, now my question is if I wire them in parallel to make the total load 4 ohms would I need a 175w rms amp or a 350w rms amp? And what do you suggest for under $150?

 

[chengny]

Wiring the speakers in parallel only halves the total impedance of the circuit. The power required by the system remains the same.


Multiply the number of subs you have by the RMS rating of each, to get their total RMS rating. You want to make sure the amp you choose is capable of supplying from 75% to 150% of the sub system’s total RMS rating.

Kenwood 10" X 8 ohm subs have an RMS value of 150 (2 X 150 = 300). Amp should be at least 300 watts.

 

[travisr1988]

Awesome, that's what I needed to know. Thank you.