My M&K MX-125 sub is not doing well. - AVS Forum
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post #1 of 14 Old 04-23-2014, 08:40 AM - Thread Starter
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Hello ,

I have my H&K MX-125 I have had for years. Bought it new I think on 2000. I have noticed over the past months that it starts to bottom out and just cant keep up with the movies any more. Music, it seems to do great, but other then that not that good. I have checked all the screws on it and made sure they are tight and have no leaks. I run it with a Yamaha RX-V1800 receiver and have the crossover set at 180. Is it time to replace bolt drivers and if so does anybody know what would be a good replacement driver?

Mike
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post #2 of 14 Old 04-23-2014, 08:47 AM
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A 180Hz crossover is quite high - does it need to be that high, or can you drop it? (What speakers are you using?)

It's possible that you're running the sub too hot to handle some of the deeper bass content in movies. Have you tried dialling back the sub level in your AVR's speaker set-up menu?

See this web page for information on a similar-sounding issue.


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post #3 of 14 Old 04-23-2014, 08:58 AM - Thread Starter
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My speakers are M&K S-100B. I don't know what my crossover should be set at. I run that auto set up on the receiver and let it do its thing. What to do you think it the crossover should be set at? dialling back the sub level? turn the volume down?
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post #4 of 14 Old 04-23-2014, 09:08 AM - Thread Starter
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I just read the link you gave me and i am going to fallow that and see how it goes.
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post #5 of 14 Old 04-23-2014, 09:59 AM
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Quote:
Originally Posted by mdezeeuw 
My speakers are M&K S-100B. I don't know what my crossover should be set at. I run that auto set up on the receiver and let it do its thing. What to do you think it the crossover should be set at?
According to this manual (PDF), the S-100Bs extend to 77Hz +/-2dB. I think you could safely get away with a crossover of 100-120Hz.
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... dialling back the sub level? turn the volume down?
No, leave the volume on the sub at its current level, but drop the level in the receiver's speaker set-up menu.

(Once your system is calibrated, the "rule of thumb" regarding adjustments to the sub is to do them through the AVR, and to leave the controls on the sub alone.)
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post #6 of 14 Old 04-23-2014, 10:20 AM - Thread Starter
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Great info. I have set my crossover to 100hz and have made the volume adjustment through the AVR and will continue to do so leaving my sub untouched Thank you for this information it is a great help.
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post #7 of 14 Old 04-23-2014, 10:23 AM
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Happy to help. I hope the adjustments work out for you. smile.gif


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post #8 of 14 Old 04-23-2014, 10:27 AM - Thread Starter
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wow it has, i have a lot more punch in the sub now. Later i will get a blue ray movie in and see how that all works!
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post #9 of 14 Old 04-24-2014, 06:45 PM - Thread Starter
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The sub and system sounds very good! thank you for all your help


Mike
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post #10 of 14 Old 04-24-2014, 06:56 PM
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You're quite welcome! smile.gif


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post #11 of 14 Old 04-25-2014, 03:46 PM
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You could probably set the crossover a bit lower & get even cleaner/tighter bass. Try 80Hz; I actually set my subs' crossovers to 50 Hz & found that the lower crossover settings REALLY improved sq. FWIW-I've done this with several (M&K, NHT, SVS, Kef, DIY & Kreisel) different subs.

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post #12 of 14 Old 04-25-2014, 03:55 PM
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If the receiver calibration set the crossover to 180hz, you should not lower it because that will leave a hole in the freq response. You need to figure out why it's setting it so high.

Just because the specs say -3db at 77hz doesn't mean youll get that in your room at your listening position.


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post #13 of 14 Old 04-26-2014, 01:58 PM
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I have an old MX-100 sub (1996) that I am looking for a amp. The cabinet and drivers are in excellent shape but the amp no longer works. Any suggestion for an amp. The system has a forward 12 speaker and a inverted 12 speaker on the bottom. Thanks.
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post #14 of 14 Old 04-27-2014, 06:07 AM
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You could start a new thread in the diy section of this board...since I am already responding, you might want to check partsexpress.com for dayton plate ampfilers. get one that is the same or more powerful than the one you have.
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Originally Posted by acermen1212 View Post

I have an old MX-100 sub (1996) that I am looking for a amp. The cabinet and drivers are in excellent shape but the amp no longer works. Any suggestion for an amp. The system has a forward 12 speaker and a inverted 12 speaker on the bottom. Thanks.
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