Hello all, currently using 2 Mac 2105's for my 4350'S, each channel to each woofer. Amps used below 250 hz, sounds really good..Last weekend I Iinstalled 2 Mac 2300's the same way with approx. same gain control settings and the bass was very powerful and was pretty much amazing. Question is this due to different amplifier design or just 3 times the power as the Mac 2105,s? I read that the 2300 and 2105 has very similar circuitry. Not sure if i should get the 2300,s or not.or maybe something in between,or do nothing. Do i need an amp with gain controls? i do like the the ability to adjust things. thanks for any help.