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Kicker L7 10" 2 ohms 600 watts Alpine M650 2 ohms 600 watts JVC KDG230 head unit 4 gauge wires, 60 amp fuse I've had my install done at Best Buy, broke my sub in, and everythingwas fine for several months. Recently my bass has been getting weakerand I'd have to turn up my gain or bass controls on the amp and/orheadunit to achieve the same amount of bass as i've had before. I went to Best Buy to get it checked out and everything seemed fine forsome reason. They couldn't find the problem. They used a voltmeter onthe car battery, amp, and subwoofer (making sure it was 2 ohms so therewas no blown voice coil) and everything was fine. They could offer nosolution and said that it was weird that i'd have to turn up everythingto achieve the same amount of bass. I took out the subwoofer today (I'm not an expert) and everythingseemed okay, nothing unusual. My bass is still weaker than it wasbefore. Do you think I'd need a new amp or is there any possibleexplanations for this problem? Thanks a lot in advance.

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  • thankyou12 Aug 01, 2008

    Thanks a lot Andrew Hawkins.

    I actually think I've fixed my problem. I tried experimenting with the low-pass filter and gain. I put the low pass filter to the highest Hz and lowered it about 20-30 hz each time while adjusting the gain, and the subwoofer all of a sudden started thumping with more air and bass like it used to. I eventually lowered it to 100 hz then 80 hz. I can now feel more bass at lower volumes where i couldn't before. My amp settings are now back to normal instead of being turned up more than they should. I think this could relate to maybe breaking the sub back in.

    Thanks again for the advice. I've been letting my car's electrical system and my ears take a break.

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I have an 04 L7, and recently it just stopped working in gereral. any way to test it? power lights turn on on the amps and i hooked another sub up to the amp but no problems. Someone suggest maybe voice coils blown?how can i check that? or how much to fix it? or would it just be easier to buy a new one and throw the other one out? thanks!Please send all comments to superchink15@aol.com thanks!

Posted on Sep 27, 2008

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If your bass level is dropping it suggests that some of the output transistors are failing in side the amp. What amp is it? it will also start to melt the solder joints if the amp is getting to hot which gives the same result
Good luck

Posted on Aug 05, 2008

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Best Buy is your problem! Just kidding....kind of. One thing that I would check is to see if there is by some strange reason, an air leak in your box. If there is a decent leak that will substantially bring down the sound output. Otherwise, but you could potentially be getting bad hearing or just getting use to the loudness. I have had the same thing happen to me. I work professionally at an audio shop and am an SPL competitor. There was nothing wrong with my system it just that my ears have gotten use to the beating. Let me know what you think.
-Andrew Hawkins

Posted on Aug 01, 2008

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1 Answer

A kicker 600.1 wired to a jl w7 10" sub? Will that work?


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In general, the 2 ohm speaker will be louder than the 4 ohm with most amplifiers. For example with this amp being sold at Best Buy you have 400 watts rms at 4 ohms or 600 watt rms at 2 ohms. However, being the same model sub they should 'hit' the same.

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I have the MRP-M1000 amp. I want to hook up 2 alpine subs to this amp. Which alpine subs would be the best for this amp? Please be specific with ohms and watts.


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Can I hook up 2 lanzar opti1532 subs 2 a kicker kx 1200.1 or do I need a bigger amp, its a 1ohm stable amp an birth sheet says 1390watts but they told me at 14+ volts it will do 1400rms


Based solely on spec sheet information the Lanzars can handle 1300 watts RMS and the KX1200 is rated at 300x1 @ 4 ohms, 600x1 @ 2 ohms, & 1200x1 @ 1 ohm. Even with a 1 ohm load you will still only be providing 600 watts to each sub. While the kicker will provide more power at 14+ volts, no car creates more than 12-13 volts via its alternator. A car battery only provides 12.6 volts. So you will be loking at 1200 watts from 1 channel as a best case scenario.

Additionally, with your 2 subs, they will need to both be Dual 4 ohm voice coils in order to net a 1 ohm final load. Each voice coil will need to be wired in parallel and then each speaker needs to be wired in parallel.

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My amp kx1200.1 works only 5 minutes and then getting real hot somebody have any idea


You need to swap your main battery for a high performance kinetic... and maybe even ad a small kinetic in the back as well (fused separately) and see how that works for you. Just one oversized kinetic battery replacing your stock battery may do that trick. Remember, its best to install two batteries of the same brand and size, its ok to use the same brand and two different sizes (a kinetic 2400 and a kinetic 600 for example, but with an isolator) but its easier and simpler to just put in a kinetic 1200 or something that will replace your stock power sucking ineffecient lead acid stuff.

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1 Answer

Installing two amps


No, thats what you don't what to do. Even if you have 2 matching amps you don't do that. Every amp puts out different, and for 2 subs, you want to play at the the same time. If your only running 2 10's, I personal would just run the alpine (it's a mono amp made especially for subs) thats plenty for what you have. make sure you bridge them to get the full response. And your other amp i would use for your highs or mids, but run it @ stereo , which is 300 w @ 4 ohms. (Note: 600w @ 2ohms would be bridged and would play in Mono)

Building Competition stereo's is a big hobby of mine.

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1 Answer

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Hello herb31,

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In the low range, an amp like the Alpine MRP-M500 will deliver 250 watts to each sub at 2 ohms. And it only costs $179. Currently, the MRP-M500 is out of stock at Crutchfield. I just bought the last one. So my 2nd recommendation would be the Sony XM-1S, which has the same power rating and according to Crutchfield is no slouch either. It's also $179. I really like the Sony, too. It has a small footprint that makes it easy to find a convenient mounting location. Both the Sony and the Alpine are CEA-2006 compliant, so you can be sure that the manufacturer provided specifications are not overrated. Assuming that your vehicle electrical system can deliver the current, both the Sony and the Alpine will deliver an honest 250 watts RMS to each of your Kickers. And 250 watts will make them kick pretty darned good.

In the medium power range, consider either the JL Audio G Series G1700 which delivers 700 watts into 2 ohms. It costs $419 at Crutchfield. Or perhaps the Kicker 08ZX750 with 750 watts at a cost of $399.

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Hope this helps. If it does, please rate as "FixYa".

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2 Answers

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