Just got an infinity PERFECT 12.1 sub and i have and mtx rt2200 amp. When ever I start to turn the ....

Set the amps pre-amp input to match the output of your head units pre-amp output voltage.That should give the best clarity,If not, then you have a problem elsewhere.

throw it away!

I have the bose 901 and the bose am5 acustamass speakers systems. Whenever the system is in the surrond mode, I get a lot of cracking and popping out of the speakers, especially when I am watching a show with a lot of action such as bombs exploding and guns being fired. What could possibly be the problem.

Using a high quality anolog multimeter (Simpson 260 series)or a digital meter set it up for measuring D.C. voltage. Set the range (if not automatic) for 50 volts or so - depending on the meter. With the amp on and acting "nuts" put the test leads from the meter on to the speaker terminals - If you see a fluctulating D.C. voltage more than likely one or more output transistors is shorted out. Take it to a repair shop or better yet e-mail the manufacture and see what they can do for you.57GEARHEAD

I wish I knew what the problem was that you are experiencing. The only advice I have for you is to maybe try posting in the Car Sound & Performance Forum as they are much more active. You will have a better chance of getting a helpful reply