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you have to understand impedance to do this. how many ohm are your 12,s`? you can run all 4 subs in mono off one amp if wired right. it works like this, lets say all 4 of your speakers are 4 ohms. if you wire 2 4 ohm speakers in a series it looks like one 8 ohm speaker to the amp. if you wire them in parallel the amp sees it as 2 ohms, ps most amps cant handle less than 2 ohms in sereo 4 in mono bridge. so no if you take one pair say the tens run them in series now take the 12 run them in series. now take and parallel both sets to amp and you have a 4 ohm load. to better understand do a google search for series parallel circuits. also you amp should be marked for bridging if not look up the amp on the manufacturers web site most will let you download the owners manual for free if in doubt about your amps ability keep it at or above 4 ohms
yes once in protect the amplifier is cut off because the current drain is more and can damage the outputs.
You might have to check the impedance of the speakers to confirm if this is lower that the rating prescribed for the outputs.
Also try to lower down the low frequency so as the load reduces.
If not the sub woofer is not matching and must be changed.
Sony audio products are not worth the buck, you will be facing worst problems in the future, my advice is just to change the amps. It is causing the problem, it cant handle frequencies when volume is turned up. and it may say 1000 watts but actually this is the peak rating your amp can handle thus meaning that it couldnt handle constant high volume usage, try crunch, kicker or hifonics amp, and look at the RMS rating on the amps when shoping.
Give that new sub a chance to "break in". New speakers require a few hours of use before the voice coil(s) and spider break in and began operating at their best performance. Is the box within the operating specs of the sub? Is this a ported box; if so you will here some turbulance type noise from the port. What type of distortion are you hearing? Alternator noise(dentist drill like sound) would only be noticable through a sub at lower volumes due to the frequency response of a sub. Is the amps lowpass crossover turned on?