Variable bass boost frequency 0-18 dB at 40-120 Hz is very useful for best configuration of your system. And it doesn''t get hot.

I think that subsonic filter doesn''t change anything. Maybe it changes because we people can''t hear frequencies below 15 Hz.

It''s an awesome amp. Power verification sheet says it''s actual power is 128W. at 4 ohm stereo and 432W. at 4 ohm mono. But it couldn''t drive my sub. at 2 ohm mono operation. Battery''s fuse was broken. I drive a Pioneer TSW-1201DVC with this amp (Nom.input is 500W and just connected one coil/4 ohm) and it kicks very well.

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Pioneer GM-X644 4 Channel Amp. Of course PRS is better than this.

see reveiws for prs-x720

see reveiws for the 720

This amp is the same thing as its bigger brother the 720 but puts out an average power 350watts rms at 4ohms mono. You can power a pair of 12 inch subs with ease. For overall impression of the pioneer prs series amps check the reviews for the prs-x720. The 220 and 320 have the same features and qualities as the 720.

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see the reveiws for the 720