Mitsu, Start with the crossover set at LPF and about 80 herts. Be sure to turn the gain down, and the bass boost off, on the amp and your headunit. That will give you a good starting point. I would adjust the gain till it matches the voltage output of your decks rcas.
I have a feeling its either your settings being to high, or your running 2 ohm instead of 8 and your amp doesn't like it.
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subs off and on
Ok on your head unit make sure your LOUD, or bass boost is turned off, and your bass adjustment is turned around zero.
On your amp there should be turn knob. (I can't find a pic of your amp online so I can't tell you exactly what it looks like. When you turn it down the subs will get quiter, and when you turn it up they will get louder. Keep in mind this isn't a volume knob. The gain function on a amp is to set the amps input stage to match the output of your headunits RCAs. (Look in the faq section if you want more info on how that works) I am guessing you have the gain turned up quiet a bit. For starters turn it down a ways and see if your amp stops turning on and off like it is. If it does then you need to find out the RCA output of your headunit, and set the gain to match it. Something to keep in mind, when you turn up the gain you are turning up how hard the amp looks for a signal. So it you have a deck with a 8 volt preout you will have the gain turned really low, since the amp doesn't have to look hard to find a signal. If your deck only has a 1 or 2 volt rca output, you will want the gain turned higher since the signal won't be as easy for the amp to see. Like I said the FAQ section has a very good breakdown of how this all works. The reason I explain it like this is so someone who is new to car stereos can have a basic idea of what the GAIN does, and how to set it to match your headunit.
On your amp there should be turn knob. (I can't find a pic of your amp online so I can't tell you exactly what it looks like. When you turn it down the subs will get quiter, and when you turn it up they will get louder. Keep in mind this isn't a volume knob. The gain function on a amp is to set the amps input stage to match the output of your headunits RCAs. (Look in the faq section if you want more info on how that works) I am guessing you have the gain turned up quiet a bit. For starters turn it down a ways and see if your amp stops turning on and off like it is. If it does then you need to find out the RCA output of your headunit, and set the gain to match it. Something to keep in mind, when you turn up the gain you are turning up how hard the amp looks for a signal. So it you have a deck with a 8 volt preout you will have the gain turned really low, since the amp doesn't have to look hard to find a signal. If your deck only has a 1 or 2 volt rca output, you will want the gain turned higher since the signal won't be as easy for the amp to see. Like I said the FAQ section has a very good breakdown of how this all works. The reason I explain it like this is so someone who is new to car stereos can have a basic idea of what the GAIN does, and how to set it to match your headunit.