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Subwoofers cut out while driving but amp LED light is still on...

I have 2 ten inch kenwood subwoofers hooked up to a 450 mono Alpine amp which is hooked up to a pioneer deck. i have had this system for a little over a year and never had a problem with amp or subs, subs do not appear to be blown but have not yet been tested on another amp. all fuses are ok and all wires have been traced. i just can't figure out what the problem is. does anyone have any suggestions becuase i don't have the money to bring it to get fixed and really want my subs back. thanks

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To test if subs are blown push them in with your hand lightly and listen for any crunch noise if you hear one then they are blown

Posted on Jan 12, 2009

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What amp would be better to use with what speakers/sub? I have a KAC-7202 kenwood 920W maximum power (150wX2 RMS, 4ohms) (230wX2 RMS 2ohms) and then the other amp I have is a Alpine MRP-M500 mono power...


I'm using that Alpine right now for 2-12" subs and I have compared it to 6 or 7 other amps this month and most were 4 channel 150Watt/Channel Bridged to 300Watts x 2 and found the Alpine to be superior in both sound quality and loudness. The Alpine has also not turned off even with full volume for hours at a time, Very solid amp I was very surprised due to it's size!

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"KAC-9105D also has a Dual Mono Drive connection that allows you to strap two KAC-9105D amps together to power a single subwoofer."Quoted fromhttp://www.kenwoodusa.com/Car_Entertainment/Amplifiers/KAC-9105D

Here's a link to a page out of the Yamaha Sound Reinforcement book. the top shows a stereo amp (1 box, two different amps inside) hooked up to drive two different speakers, which is known as 'stereo' mode.It then shows the two amps hooked to the opposite sides of the same speaker, which is known as 'bridge' mode.http://books57.net/ampOuts.gif

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1 Answer

Amplifier displays "CUR"


Hello anwbrown,

The "CUR" display means that the amp is drawing excessive current and the protection circuit is activating. Too low impedance or shorted speakers will cause the amp to draw excessive current.

The Alpine V12 is a Class D mono amp with only one set of speaker outputs. All versions, M301, M501, and M1001 are only stable to 2ohms. Assuming that all 6 of your connected subwoofers and speakers are 4ohm and they're all connected in parallel, the amp sees a .67 ohm load, far below it's rated impedance.

When brand new, the amp could probably operate at low to moderate volume levels without drawing excessive current. But as electronic components age, their tolerances change and they become less able to withstand excessive current or mismatched impedances.

I'd get a 4-channel amp and drive the 4" speakers off the front channels and the 6X9's off the rear channels. And just power the subs off the V12 making sure that they are connected to show a minimum load of 2ohms.

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you need more batt, more amps, try new batt, capacitors are paperweights, spend on good batt.

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your amp may have burned out or try checking the fuse in the amp and the car also your channels may be burned or you may jus have water damage to the amp

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That amplifier is 900W x 1 @ 2ohms.
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1 Answer

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