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How do i fix this problem? i set up Three 8" JL Audio (not sure what W's it is but im positive its not a W7) with a 800 watt Fosgate Amp. i have a Alpine CDA 9811. The problems come when i turn the volume up high then it starts to cut off when the bass is thumpin. Not sure what to problem is or how i go about fix'in it. Any help is appreciated.

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Your speakers aren't strong enough to handle the current from the amp, 8" speakers connected to an 800 watt amp? You need MORE SPEAKER than that.

Posted on Dec 05, 2008

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--RMS of the speakers is what you want to use to find your amp.
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Although amps with 5 channels are pretty rare, you can get one. Alpine, Boston Acoustics, Infinity, JL audio, MTX, and Polk all have 5-channels ranging in price from around $350 up to around $1,000. The Alpine PDX-5 will output 75X4 watts RMS for the front and rear stereo channels and 300 watts to the mono sub channel. It is priced at $599.99 at Crutchfield.

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Hey buddy your question caught my eye because i have a buddy that was wondering the same thing not so long ago-and im no expert but i have had my run with rockford fosgate amps and a few sonys as well. So first of all if you know fosgates well you know that they ALL put out more power than what they are rated at -example your 400 watt fosgate amp is rated at 400 watts but if you got it new than it came with a birth sheet that shows you how much its really putting out-im just throwing a number out there but its probably closer to 480 actual watts. Now you get the sony amp and it says its a 1000 watts but its all bs -it actually is rated at 400 continous usable watts- so the reason that its not any louder than the fosgate is because you bought an amp with almost identical power output. The other part of the problem is that you are limited by your speaker-you could buy an amp that actually puts out 1,200 watts and plug it right in to your sub and its going to probably blow within 30 seconds or quite possibly catch fire. The numbers when dealing with car audio that you have to pay attention to are the R.M.S. power ratings - never look at the peak or max wattage because its all bs and yea its all bs- As i was saying you are going to be limited by your sub because as it stands right now you cant put much more power on that thing without blowing or roasting the coil. All subs have a limiting factor as to how much air they can move- this is called X-MAX and that tells you how far the speaker cone actually moves from start to peak excursion- once you have supplied the speaker with enough power to reach its x-max then thats it -no matter how much power you put on it it wont move any more air than that-and you will create heat and distortion if you try and thats just begging for a blown sub. If you want it louder than upgrade your sub to something that will move some serious air like a jl audio w7 or orion hcca subs -those subs can get it on like dammmmm or easier than that get another sub and then your moving twice as much air at a fourth of the price of buying a balls out jl w7-anyhow good luck with that

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