Audio Systems: Subwoofers, kenwood kac 7202, loudspeaker impedance

Question
Right now in my camaro I am running 2  twelve inch 4 ohms 200 RMS subs at 2 ohms n one channel of my amp. On the other channel of my amp I am running 2  ten inch, 8 ohms 200 RMS subs and a 4 ohms 200 RMS sub, I am running 2 ohms on this channel also. My amp is a Kenwood KAC-7202 the RMS power output on the amp is 150 watts-2 channels at 4 ohms and 230 watts-2 channels at 2 ohms. Do I have a big risk of blowing my amp or subs?

Answer
First, there is no such thing as RMS power.  I know everyone uses that term for power, but rms is a sine wave voltage and current term, not power.  What you get when you use rms voltage and rms current is average power.

Back to your question:  The amp you are using is rated at 2 ohm load delivery per channel and is supposed to deliver 230w X 2.

My experience is that even though the amp is rated for 2 ohms, the heat buildup becomes excessive and the longevity of the amp is deteriorated.  Why?  Because a loudspeaker impedance curve is not flat. And, the lowest point in its impedance is alway below the rating AND is always in the bass end where lots of power is pumped into the system.  So, the real impedance of the loads you have placed on the amp is likely to be less than 2 ohms in the 50 to 100 Hz area.  Is it dangerous?  Probably not in the short term, but in the long term and when you are pumping it hard with driving bass music it may send the amplifier into heat overload too often.

That is my opinion.  Let me know if you have further discussion about it.

C