For those of you having problems with the sub, check to see if you have the pass thru filters on the sub output at 80 (120 is to high for this sub and sounds awful) and readjust the front and rear frequency cut offs. I play my deck at max all the time and no problems. Keep in mind Im never in car less then an hour and I had to turn up that little Kenwood to match my new front are rear channel amp (cant wait for summer to put in my new sub amp.
Speaking of amp below is a shame less promotion, on one of the best thing in car audio Ive bought,
By the way my new front amp is an ALTO, I mentioned this because its one of the best amps Ive bought for the price, for those of you who dont know what alto is, they are in professional studio recording equipment and trying to get into the car audio market.
I tried this amp because I didnt want up grade the charging system in the protg; this amp is perfect for small cars with light charging system and where weight is a concern. Why was this amp right for me.
1st its very efficient 80 to 90% viruses a good class A amp of about 50 %, (100 x 4) only needs a 8 gauge max (only use about 24 peak amps, were as my JL needs a 4 gauge min and use 70+ amps with the same continues wattage of 400 watts total) for my car that $30+ saving in power cable alone
2nd the size for this thing is 9x9x2 (guessing, but not much bigger if not smaller) so many place to mount this thing and still have full access the to trunk (good for me because I travel a lot)
3rd its about 2/3 the weight
4th it sounds better then my JL 450 (125 x 2 and 75 x2) about as good as the Diamond d7104 (100x4) I returned to get this and save $500, although it does not sound as good as my McIntosh but a Protg is not worth a McIntosh
Only draw back, for those who think 2 ohms is better then 4 ohms and so on. is that you cant bridge the amp and its only handle 4-8 ohms
But their 4 channel amps put out 60 watts and one puts out 100 watts, I think the 8 channel puts out 100 per a channel and the cinema is 6 x 80 and 1 sub at 300 watts
For those that do research this do note that this is a class D amp but the technology is in my opinion what car audio will go to, based on quality sound to power consumption alone.
I would get into sound, staging and everything else but I think people should research things before buying and not buy because I said this amp is good or for that matter because someone said a class A/B amp is better than a D, for those interested in good SQ and spend less than $1000 for amps (my 100x4 cost me $461 and I think the 7 ch cinema is 600 or less) look into it and those interested in impressing their friends, go to Best Buy because this wont give you what your looking for and no other hi end audio will