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Old 09-16-2010
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New Subs...Question??

well last night i picked up 2 kenwood kfc-xw1200f shallow mount subs in a box for under the back seat of a xtra cab chevy.....i got all of it for 125 which is why bought it....the subs are about 200 each and im sure thats a pricy box...any way the sub i have now is a rockford fosgate p3 shallow with dual 4ohm so i have it wired at 2 ohm....the sub is 300rms...and my alpine amp puts out 400rms at 2 ohm...anyway these subs are single 4 ohm. so if i wire one up at 4 ohm my amp will only put out 220w and the subs are 350rms. and if i wire them both up at 2ohm then they will take 700rms and my amp only puts out 400rms...so basically is it safe to run them? i am most likely only gonna have one. also online it says for the subs it 100-350rms.....so doesnt that mean they can be run off less power?
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Old 09-16-2010
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more power tends to hurt it less than too little power...but thats rumors i hear.

i think it'd be fine but im always super picky about what power i put to my subs...i always stay within rms range....i dont just buy subs for the deal....most of the time lol
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Old 09-16-2010
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yea...well if i dont use them i could turn them and sell for like $400 easy....so thats why i got them...
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Old 09-16-2010
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yea...well if i dont use them i could turn them and sell for like $400 easy....so thats why i got them...
do that, and buy something that will work better with your amp.
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Old 09-18-2010
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but too little power wont hurt them.. what do you think happens when you turn the volume down? wattage also goes down.
what hurts them is when the owner expects too much from the amp/sub and turns the gains/bass boost/volume too high. then you get clipping. clipping kills, if the sub cannot handle the wattage of the clipped output.
Its always better for sound quality when you run a amp that outputs more power then you need. you can always adjust the wattage down with the gains. the added headroom will make your music more dynamic and solid.

two subs on that amp *might* be louder because your moving more air, but will be weak, floppy and distorted sounding. One sub will sound tight, powerful, dynamic and more musical.

You can make them work with what you have but just don't expect too much from them.
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Old 09-18-2010
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but too little power wont hurt them.. what do you think happens when you turn the volume down? wattage also goes down.
what hurts them is when the owner expects too much from the amp/sub and turns the gains/bass boost/volume too high. then you get clipping. clipping kills, if the sub cannot handle the wattage of the clipped output.
Its always better for sound quality when you run a amp that outputs more power then you need. you can always adjust the wattage down with the gains. the added headroom will make your music more dynamic and solid.

two subs on that amp *might* be louder because your moving more air, but will be weak, floppy and distorted sounding. One sub will sound tight, powerful, dynamic and more musical.

You can make them work with what you have but just don't expect too much from them.
totally agree the guys who say too little power will hurt the subs are idiots your current set up now im supprised you didnt blow your sub or burn up your amp because your over powering the the woofer... you can run them either way just one @4ohms or both in parallel at 2ohms and be perfectly fine... what kinda shape are the subs in do they have alot of play in em if theyre good i would concerder looking for another amp one that put out 350 @4ohms x2 would sound really clean but if you want a bigger bang 700 @2 ohms would do the trick it will still sound clean but as stated above its all about tuning the amp gain should never go above 3/4 actually it should be tuned to your deck using an ohm meter for best sound perfermance everyone thinks the gain is for volume control but really its just there to match the amp with the voltage coming out of the deck threw the rcas... also dont use the bass boost its crap and prematurely burns up amps specially if you have a cheaper amp
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Old 09-18-2010
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ya the subs are in perfect condition with no play.....and with my current setup my gain is turned way down...i install everything but i have a professional audio shop in town tune everything for that reason.....also would one of those sound better than my current setup?...also are those good woofers? are they worth buying a new amp over or would i be better off just reselling them and buying a sub thats better for my amp?
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Old 09-19-2010
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more power tends to hurt it less than too little power...but thats rumors i hear.
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totally agree the guys who say too little power will hurt the subs are idiots
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Old 09-19-2010
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they are decent subs. most subs will do the trick.
if the subs work well for your setup. I would get a new amp.
sell the alpine. buy a nice powerful amp.

no need to go to the tuning shop.. unless its free. its not difficult to adjust gains or crossovers of a sub amp. Ill help you, pm me if you want.
its a bit different when your running multiple amps and active speakers

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the guys who say too little power will hurt the subs are idiots
i wouldn't go that far, I was one of those people.
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Old 09-19-2010
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ya..i have a alpine mrp-f300 powering my alpine type s door speakers....so that is why i had them tune it...and ya its free...
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Old 09-19-2010
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Ehh, it's true, lol.
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Old 09-20-2010
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what amp do you have now
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Old 09-20-2010
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alpine mrp-m450
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Old 09-21-2010
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Ehh, it's true, lol.
huh?
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