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How I tune:
turn amp all way down or disconnect rcas for now, turn up stereo to a song with some bass you listen to and crank it as loud as you would (not max about 3/4, use this to tune inside speakers (don't have bass maxed/distortion...)). Now dial in amp: turn up a bit probably to 1/4 or so then tune frequency I'd usually say around 100hz, then adjust gain again to where it sounds good...be easy on them for awhile to let them break in (don't blast them all day!). Usually bass boost is only 1 frequency with a curve (40hz or something)...so I try to not use it much....
I would say that your subwoofer Or speaker leads have shorted out...when the bass hits as you say it drives the amp hard but if it is trying to dump power onto a shorted speaker or speaker wires it will blow the output power transistors not to mention other vital components of the power amp...i suggest you test your speaker leads with a Multimeter on the ohm setting before connecting a repaires or another amp.. to make sure there is no short on the leads and that the resistance is around 4 ohms or so depending on how you have your drivers wired...but anything lower than 2 ohms will cook an amp! you can normally pick up a meter from anywhere for around $10..
This question really can't be answered accurately online for a few reasons.. we don't know if you have a ported or sealed box, we also don't know what kind of box you have, wether it's a 4th order, 6th order...blah blah blah. We also don't know what the box has been tuned to (if it's ported). unfortunately, you'll have to play around with it yourself or get someone to physically see your set up. But here are some tips to help you tune your set up.
1st set up the frequency( or crossover). this basically tells you sub the range it should run in. alot of people don't set up their crossovers properly and the sub is reproducing frequency's the mids are producing so some notes are far louder than they should, which makes for unbalanced audio. when you get that sorted out move onto the gain. (keep in mind, that if you've only installed a sub and have stock speakers or are running upgraded speakers off the head unit and not an amp the frequency is going to be harder to control since you can't control the other speakers.) next the gain, the gain is really just volume. Play a song with alot of bass and set the sub at a volume that pounds, but not to the point where your other speakers get drowned out and there you go, you should have a pretty good sounding setup. If this is the first time you're tuning it may take some time, but please do this with your car running, far to often i hear people killing their batteries as they don't realize that amps really do **** alot of power.
If you purchased the subs and box separately the box usually tells you what it's tuned to (if ported) and you can use that to guess where to set your frequency.
kicker subs arnt ment to hit the lowest bass, unless you go spend a **** load of money, im talking 3000 wat amp, ant some 15' or bigger subs. the most commen kickers are 12' subs, so im asuming you have 12' subs, if not, this (said lightly) should work. try turning the bass boost screw on the amp to the middle of its turning range. this will offer the greatest balance between high and low bass. if you want more low bass, turn it past half. if you want more high bass, turn it down. i have mine set to mid range, but i also recently purchased 2 18' kickers. with every new set of subs, you should spend at least 15 min tuning the amp to get the best performance. every sub is different. hope this helps, good luck.
Hello, i have a hifonics brutus also, in the manual it states to set the eq at half way, so that there is no clipping or at least to prevent clipping , the eq will make the bass punchier, if you do go pass half way, i would recommend to readjust your gain settings, also check your head unit settings and make sure everything is flat, bass, mid bass etc. example i had my eq past half but i had my gain at mid way, it was hitting hard, then i tried turning the eq all the way down and the turning up the gain and the bass was smoother so it depends where you set it, and what settings you have on your head unit tone control (bass, treble etc)
Both the bass boost and the gain generally do the same thing, except the bass boost is essentially "additional gain" at a particular frequency (in this case, 45Hz). I would suggest lowering the bass boost (10?) and adjust the gain. Honestly, you may have to play around with both settings until you find a happy medium. There is going to be a maximum the amp can provide no matter how you get there. Hope that helps!
recommended maximum for the sub boxes is 1600/800
here is the link to the manual if you need it;
If you really wanted to get the maximum from your subs then a zx750, or possibly a zx1000 would be the ideal choice. Either amp you suggested will work, but you will have more fun with a 750 which should do fine.
Hope this helps :)