i just bought this amp but i dont know how to tune it. i just need to know what subsonic (allows control from15hz-35hz) and phase (shift allows 0-180 degrees) mean.

 

Subsonic (companies should start labeling infrasonic instead). Anyways, It is used to attenuate frequencies below what you set to choose it at. Basically a Highpass filter at a very low frequency. If you have a sealed box, it is not necessary to set it. It can be off if you want. If you have a ported box, thats a different story. If you have one, what freq. is it tuned to?

The phase controller is what controls the movement of the cone when given a signal. For simplicity, if you send a subwoofer a DC current, the cone will either go up or down. But say it goes up. Now when you change the phas to 180 degrees, instead of going up when it gets the signal, it goes down. Completely opposite of what the amp is getting as a signal. I find it most of the time that most people won't notice any difference. Just leave it at 0 degrees, or play around with it.

 

man thanks for that info. i was so lost, i even went to the hifonics website and didn't even get anything from it, by the way i got a sealed box. i cant turn the subsonic off though. it doesnt have an off and on switch so where should i put it??

 

Just set it to around 15hz and you'll be fine. Its odd that it doesn't turn off. But just set it around 15hz, or adjust it until you like the way it sound.

 

ok, oh i forgot where should i place the bass eq (0db-18db). i had it in 18 right now should i turned it down

 

if you like it then keep it the way it is. I personally hate it because of the excessive distortion. It gets very muddy at high volumes. Lots of peaks (thats what bass boost does). But there are times when I want more bass, but the most I've used was about 3db or so. Then again, i'm not a basshead

 

yeah i noticed that i sacrifices the sq when i have it up high. too much bass and it doesnt seem to stop.