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EP500 Sub rattles sometimes
#214057 07/02/08 05:49 PM
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I have an Epic 80 7.1 system with the EP500. It is incredible sounding to say the least. One thing I have noticed, though, is that every so often if there is extreme lowend bass happening, the EP500 will vibrate so hard that the cone rattles against the enclosure. Is this normal? If I put in digital video essentials HDDVD and do the speaker test, I can repeat this every time.

I have all of my speakers set to small in my receiver so the sub is handling all low end. I've only heard this on two Bluray movies so far, so it's not a big issue, but it does concern me.

Does anyone have any ideas/suggestions?

Thanks


Mitsubishi 62" DLP Pioneer VSX-84TXSi SA 8300HD XBOX 360 Axiom Epic 80.500 7.1 Speakers
Re: EP500 Sub rattles sometimes
nicholc2 #214065 07/02/08 06:38 PM
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have you calibrated with an SPL meter to make sure it is not running to hot?

I had a rattle on my first ep 500 and axiom sent me a new driver, a new amp, and finally sent me a whole new sub.

You may find some helpful info in these links


http://www.axiomaudio.com/boards/ubbthreads.php?ubb=showflat&Number=192062&fpart=1

http://www.axiomaudio.com/boards/ubbthreads.php?ubb=showflat&Number=181851&fpart=1


-David
Re: EP500 Sub rattles sometimes
terzaghi #214070 07/02/08 07:04 PM
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Do you have the sub calibrated to the same SPL as the other speakers? If you have the volume(gain) on the sub and/or receiver cranked to high, you might be running the sub to hot.


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Re: EP500 Sub rattles sometimes
SirQuack #214073 07/02/08 07:34 PM
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My trim is set to flat. I have the crossover bypassed. The sub volume is at the first tick past min. I used an SPL to do all of the speakers. I set the sub to 10db higher than the rest of the speakers to give a little more punch. So 75db for all but the sub which is set to 85db.

I didn't think that 10db would affect the subs performance. Is that an incorrect assumption?


Mitsubishi 62" DLP Pioneer VSX-84TXSi SA 8300HD XBOX 360 Axiom Epic 80.500 7.1 Speakers
Re: EP500 Sub rattles sometimes
nicholc2 #214076 07/02/08 07:40 PM
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You aren't incorrect. Have you tried tightening all the bolts on the sub? The allen wrench that comes with the sub in order to put on the feet fits in all of the bolts.

That's the first thing I did when I got my EP350, although I wouldn't tighten them too hard... wouldn't want to strip out the MDF!


I am the Doctor, and THIS... is my SPOON!
Re: EP500 Sub rattles sometimes
nicholc2 #214077 07/02/08 07:49 PM
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10db may be a little much since about 6 db is perceived as "twice as loud"... I still don't think it should be rattling though.

I run my ep 500 at about 80 db with all others set to 75. Occasionally during an action movie I increase the sub level in the receiver from -2.5 to -1 db which offsets this a little more... but that is usually at an 'average' listening level.

does the noise sound like it is comming from the driver or from the amp?

Ken, the screws tighten into threaded metal sleeves... do you think over tightening would really strip the MDF? It seems like it would strip the theads on the screw or the sleeve, or strip the head of the screw.

Either way I wouldn't over tighten anything... maybe tighten about a 1/4 of a turn or so.

Last edited by terzaghi; 07/02/08 07:55 PM. Reason: added "still shouldn't be rattling"

-David
Re: EP500 Sub rattles sometimes
terzaghi #214078 07/02/08 07:51 PM
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I disagree. With certain test tone generators (ie, DVE, which I have) it is necessary to bump the sub by 10dB because of some reason that I don't remember off the top of my head.


I am the Doctor, and THIS... is my SPOON!
Re: EP500 Sub rattles sometimes
Ken.C #214080 07/02/08 07:54 PM
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You should be able to get the EP500 to max volume before the DSP kicks in, and should not hear any rattling.


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Re: EP500 Sub rattles sometimes
Hutzal #214081 07/02/08 07:55 PM
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Yes, when I called JC from axiom he said that you should be able to turn the EP500 up as much as you want and it should not rattle.

is it possible that the noise you are hearing is port chuffing?


-David
Re: EP500 Sub rattles sometimes
Hutzal #214083 07/02/08 08:04 PM
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It seems like it's coming from the driver. When I first heard it from the DVE tests, I took the front off and could see the driver head and it looked as if it was rattling against the back of the driver due to the amount of movement.

I'll try shoring up the screws, but I don't think that's the issue. But you never know. :-)


Mitsubishi 62" DLP Pioneer VSX-84TXSi SA 8300HD XBOX 360 Axiom Epic 80.500 7.1 Speakers
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