Need help setting up my amp with my sub?

Andrewbe
10+ year member

Junior Member
I have a pair of 10" kicker comps powered by an alpine MRP M650 600W amp. I am having issues with the subs making a knocking sound? I figure they are clipping, but i've never really worked with subs before. Reviews on kickers site say the comps kick hard. Mine aren't. I had it installed by a car audio shop today, and found out that they had 2 bass boosts on (one on the LOC and one on the amp), and that was making the knocking, but when i turn it down so the speakers stop knocking on hard hits, I can barely hear the subs. Am I not setting up something correctly? I set the bass boosts down to stop clipping, and tried setting the gain lower so it wouldnt knock.

Are the knocks bad? did I buy POS subs? lol I'm aware I have a 600w powering speakers rated at 150 watts, but they are rated for 86 dbs which should be loud enough to have an affect on my system without crapping out I think.

Thanks for any input.

 
I have a pair of 10" kicker comps powered by an alpine MRP M650 600W amp. I am having issues with the subs making a knocking sound? I figure they are clipping, but i've never really worked with subs before. Reviews on kickers site say the comps kick hard. Mine aren't. I had it installed by a car audio shop today, and found out that they had 2 bass boosts on (one on the LOC and one on the amp), and that was making the knocking, but when i turn it down so the speakers stop knocking on hard hits, I can barely hear the subs. Am I not setting up something correctly? I set the bass boosts down to stop clipping, and tried setting the gain lower so it wouldnt knock.
Are the knocks bad? did I buy POS subs? lol I'm aware I have a 600w powering speakers rated at 150 watts, but they are rated for 86 dbs which should be loud enough to have an affect on my system without crapping out I think.

Thanks for any input.
go to another shop. have them check it.

 
I went to the shop and they were saying it was making that niose cause I had my mids boosted on my factory head unit. So apparently I lost my ability to change my eq settings for my different music.

They turned down the mids and sure enough the subs handled more power. Would I need to get an EQ for my sub preamp signal? Would an EQ cancel out all the mids and treble or would it just make em quieter?

 
I went to the shop and they were saying it was making that niose cause I had my mids boosted on my factory head unit. So apparently I lost my ability to change my eq settings for my different music.
They turned down the mids and sure enough the subs handled more power. Would I need to get an EQ for my sub preamp signal? Would an EQ cancel out all the mids and treble or would it just make em quieter?

Not sure what u mean or what the shop is trying to say. Only thing that I could think of that makes some form of sense is that you had your ssf set to low. Knocking makes me want to say you were bottoming them out. Having the bass boost ON could cause this but I dnt think your mids had anything what so ever to do with your issue. P.S toss the loc and get a HU even a cheap used $50hu would be better then a loc unless ur using a jl clean sweep, audio control, etc.

 
HU would be what? I know at first they were installing with a LOC but then they ran into issues so used a box that from what I understood tapped into all of the signals and sent them all to the amp, so it's getting the lows, mids, and highs (from what I understand). The device has a set of volume, bass boost, and some other bass knobs.

I know these subs can't handle much, buty the shop put in 2 12's and they were knocking too until they turned the mids down....

 
So my amp has an LP filter, so how would boosting the miss cause the subs to knocking? They were knocking with the LP filter set to 50Hz. I just don't understand why they told me the mids were causing the subs to knock. Perhaps the subs they tested were also kinda crappy. They were rockford 12"s

 
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Andrewbe

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