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JL Audio question-MX how much pwr

Old 10-03-2011, 05:07 PM
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Default JL Audio question-MX how much pwr

My MB quart speakers rotted out after a couple of years and i replaced them with JL mx650. I dont feel they sound as good as my old MBquarts although the quality of the speaker seems far superior. I have an old jl 4/300 amp running 6-mx650 and 2-10' subs. 6 speakers in parallel from 2 channels and 2 subs from the other 2 channels.
My problem is that the sound does not sound crisp, even a little static. specially if i go above 25 or 26 on the volume, (CMD6 clarion head unit).
Im wondering whether to change the amp or change the speakers for the M series (is it worth it? I cant return mine now). Can these speakers handle more power from a bigger amp? Also I have to replace my old subs and Im debating whether to get the M or The MX.
Im open for any and all suggestions.
Please help.
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Old 10-03-2011, 06:49 PM
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I'm having the same problem with the cmd 6 and 4 JL mx 650's run straight off the head unit. The system is not particularly impressive but when the volume goes past 27(33 is full volume) it's distorted. I'm now thinking the problem may be in the Clarion. I was all set to pull the speakers until I read you post.
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Old 10-03-2011, 07:02 PM
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Were you running the same "old" amp on your MB quarts that you were happy with? You are currently running your JL amp at less than 2 ohms which is probably not recommended. . I would redo the install on the amp for setting the amplifier gains, also what is supplying the source (CD, IPOD, etc.).

Every speaker has its limitations, try resetting the amp gains and turn them down.







Originally Posted by mandyp View Post
My MB quart speakers rotted out after a couple of years and i replaced them with JL mx650. I dont feel they sound as good as my old MBquarts although the quality of the speaker seems far superior. I have an old jl 4/300 amp running 6-mx650 and 2-10' subs. 6 speakers in parallel from 2 channels and 2 subs from the other 2 channels.
My problem is that the sound does not sound crisp, even a little static. specially if i go above 25 or 26 on the volume, (CMD6 clarion head unit).
Im wondering whether to change the amp or change the speakers for the M series (is it worth it? I cant return mine now). Can these speakers handle more power from a bigger amp? Also I have to replace my old subs and Im debating whether to get the M or The MX.
Im open for any and all suggestions.
Please help.
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Old 10-03-2011, 07:46 PM
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I was running the same amp, and it sounded good, Im playing off the radio(tuner).
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Old 10-04-2011, 05:04 AM
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im surprised you didnt burn up the amp. of course they arent going to sound good off a head unit the jl speakers need power and your head unit is 21 watts rms. the head unit sends a distorted signal after 27 volume thats why if you read the manual on amps they say set the volume at 3/4 when adjusting the gain on the amp so you dont get a distorted signal sent from the head units.
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Old 10-04-2011, 10:42 AM
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As stated double check the amp setup, make sure you have no air leaks around your speakers you do not want air leaking from the back of the speaker forward. You should probably add a second amp or find an amplifier stable to 1 ohm. If you continue to run your amp below two ohms you will shorten its life.



Originally Posted by mandyp View Post
I was running the same amp, and it sounded good, Im playing off the radio(tuner).
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Old 10-04-2011, 10:51 AM
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Will changing my amp to a 6/600 from jl help my cause and get rid of the static? should I also get a second amp for the subs? And can my 6-mx650's handle the wattage the jl6/600 puts out.
Thanks in advance for your help.
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Old 10-04-2011, 01:04 PM
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go buy a m700/5 amp and run your subs off the sub channel they will both get 150 watts apiece. and then run 1 set of speakers off channel 1 and 2 and then parallel the other 4 speakers on 3 and 4. the set of speakers on 1 and 2 will get 60 a piece which is ideal and the other 4 will get 45 watts a piece. then once you have the amp in unplug your speakers and set the gain on the amp using the cd that jl offers. make sure you do it with the setting on the head unit at 3/4 volume. the more you turn up the head unit the more distorted of a signal it sends. if you send a clean signal to the amp it will amplify a clean sound. send a distorted signal and it distorts pretty simple concept. i have 3 mhd900/5s and the loudest my stereo ever sees is 28 with a cmd6. blow your ears out but you would never notice because the signal is clean still. sounds quality over shit. and remember just because it hurts your ears doesnt mean its louder.
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Old 10-04-2011, 01:29 PM
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Bradv- thanks for your help, can i get similar performance by using the jl m600/6 hooking it up as you have recomended. Will the subs performance suffer alot?
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Old 10-04-2011, 01:38 PM
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id stay away from the 600/6 because then youd basically have to use the last 2 channels to give the subs any power and theyd be getting 60 watts at that point unless you bridged them and in that case youd be taking up 4 channels and trying to run 6 speakers off 2 channels which would basically put you below 2 ohms so wont work. if you want to go the 600/6 route get a mono block amp to go with it.
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Old 10-04-2011, 01:44 PM
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Originally Posted by hilo View Post
I'm having the same problem with the cmd 6 and 4 JL mx 650's run straight off the head unit. The system is not particularly impressive but when the volume goes past 27(33 is full volume) it's distorted. I'm now thinking the problem may be in the Clarion. I was all set to pull the speakers until I read you post.
You need an amp.
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Old 10-04-2011, 04:49 PM
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Bradv- I was able to cancel the order for the m600/6 and I ordered the m700/5. thanks the setup you sujested makes sense and doesnt blow my budget. My only concern now is will the mx650 handle the amp. What do you think?
Another questions: does the amp automatically go to 2ohms when you put 2 speakers on 1 channel?
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Old 10-04-2011, 05:00 PM
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Point taken. Thanks for the education guys.
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Old 10-04-2011, 05:06 PM
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Yes ur mx650s will be fine on that amp just set the gain correctly before connecting speakers and then adjust gain down from there to get the sound u want. Amps aren't what determine ohm. Speakers resistance does. 2 8 ohm speakers wil have 4 ohm 2 4 ohm speakers wil have 2 ohms of resistance etc. Some amps can handle 1 ohm most can not.
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Old 10-04-2011, 05:56 PM
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Great info thanks!
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Old 10-04-2011, 09:49 PM
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Bbignick1 & brav-Thanks guys great info, Ill post after the install.
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Old 10-04-2011, 10:08 PM
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FYI:

1. The MX 650's are made for NO AMP, and/or low power. The M-650's are made for use with an amp/or, high power.

2. The CMD's all distort at high volume levels. My cheap Jensen, and MBQuart "junk" head units, both sound better than the Clarion head units at high levels. (ALL with NO AMP). If you install an amp, you should not need to put the volume high enough to reach the point they start clipping.

3. SUBWOOFER. Makes all the difference in the world.
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Old 10-05-2011, 07:40 AM
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Birdman- I agree with the subwoofer.
The Rms on the mx650 is 60 watts shouldn't that be enough?
I don't want the loudest system at the sand bar, just something that
Sounds nice and that I can listen to from the water.
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Old 10-05-2011, 08:10 AM
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Originally Posted by hilo View Post
.......... The system is not particularly impressive but when the volume goes past 27(33 is full volume) it's distorted.
I remember the good old days when "10" was the loudest.
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Old 10-05-2011, 11:49 AM
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Originally Posted by mandyp View Post
Birdman- I agree with the subwoofer.
The Rms on the mx650 is 60 watts shouldn't that be enough?
I don't want the loudest system at the sand bar, just something that
Sounds nice and that I can listen to from the water.
Enough for what?? If you mean enough to handle being connected directly to a head unit, yes, that is what the MX version is designed for. If you mean enough to handle being connected to an amplifier, then NO, you should instead get the M650 instead which handle more like 150 RMS or something like that.



EDIT: I think you might have instead meant, isn't 60 watts enough to drive the MX speakers? If so, then probably NOT. Check the specs on them, but if I recall the minimum they wanted was something like 120watts to drive them properly. If your driving them with 60 watts, the M650 would probably sound better.
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