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#141364 - 06/10/06 10:43 PM EP-500 rattle
Billy_hk Offline
frequent flier

Registered: 03/08/06
Posts: 10
when I watched movive "we were soliders", at some scenes it would start rattle. Then I removed the grille and found the woofer moves forth and back at large distance which causes this. So,is my woofer damaged in certain extend?
The volume is only above -28dB on AV receiver.

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#141365 - 06/10/06 11:01 PM Re: EP-500 rattle [Re: Billy_hk]
SirQuack Offline
shareholder in the making

Registered: 01/29/04
Posts: 13337
Loc: Iowa
The MAIN volume on the receiver may be at -28dB, but what about the volume on the back of the sub? Also, what is the dB level of the Sub channel on the receiver? Also, how do you have your speakers setup in the receiver, small or large, and what crossover setting?

Here is my settings:

Sub - Volume/Gain knob about halfway between Min. and 9o'clock position. Crossover knob set to bypass. Trim set to Flat.

Receiver - All speakers set to small, crossover 80hz, dB level of sub channel about -4dB.

My guess is some of your settings are wrong.
_________________________
M80s-VP180-QS8s-EP600-2xEP350 Denon3808 Outlaw7700
M22-OWM22-VP100-Denon2805
Audio Nirvana

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#141366 - 06/10/06 11:10 PM Re: EP-500 rattle [Re: SirQuack]
Ken.C Offline
shareholder in the making

Registered: 05/03/03
Posts: 17782
Loc: NoVA
The EP x00s can get a lot of movement in their woofers; I kind of doubt that you've done anything wrong there. More likely, there is a loose wire or some such inside the sub (I'm assuming you've localized it to the sub, and not something in the room rattling). I'd probably give Axiom a call and check in with them about it.

The solution to rattles that was often bandied about here awhile back was to make sure all the screws around the woofer were tight. I can only add to this: be very, very careful with that screwdriver. You'll be putting a lot of pressure on it, and if it slips, you'll regret it. A lot.
_________________________
I am the Doctor, and THIS... is my SPOON!

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#141367 - 06/11/06 01:02 AM Re: EP-500 rattle [Re: Billy_hk]
Billy_hk Offline
frequent flier

Registered: 03/08/06
Posts: 10
My settings: 80Hz cross at receiver. +1.5dB gain for subwoofer setting at receiver and trim Flat. Bass out for subwoofer only.
Mine reciever is Yamaha 2500. Subwoofer volume at 9 o'clock.
The rattle sounds like "didi dada". I am afraid it is bottoming.
The subwoofer has been using 3 months.Most of the material do not generate rattle. My listening volume will never greater than -25dB.The movies have the woofer rattle so far are: War of the world, SkyCaptain, We were soliders.

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#141368 - 06/11/06 01:08 AM Re: EP-500 rattle [Re: Billy_hk]
Ken.C Offline
shareholder in the making

Registered: 05/03/03
Posts: 17782
Loc: NoVA
Call Axiom. Those things are specifically designed not to bottom out, so it sounds like there may be something wrong. And something wrong is usually covered under warranty!
_________________________
I am the Doctor, and THIS... is my SPOON!

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#141369 - 06/11/06 01:09 AM Re: EP-500 rattle [Re: Billy_hk]
Wid Offline
axiomite

Registered: 06/22/03
Posts: 6720
Loc: The Peoples Republic of Il.

My experiance is when a sub is bottoming out it is more like a loud clapping sound. With the dps on the 500 this should not be bottoming out.

Is the system calibrated ?
_________________________
Rick


"A fear of weapons is a sign of retarded sexual and emotional maturity." Sigmund Freud


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#141370 - 06/11/06 10:10 AM Re: EP-500 rattle [Re: Billy_hk]
SirQuack Offline
shareholder in the making

Registered: 01/29/04
Posts: 13337
Loc: Iowa
Not sure if this is causing your problem, but it sounds like your running the sub a little to hot. Axiom recommends starting with the sub volume(gain) between Min. and 9 o'clock, which would be around 6.5 to 7 o'clock position. In addition, if your receiver is at +1.5 dB that would seem to be to much.

Does your receiver have the built in microphone setup? Or, do you have a Radio Shack SPL meter? I bet if you calibrated everything to 75 dB's you would find that the receiver sub setting would be at more like -6dB's and/or you would need to turn down the sub gain.

When I first got my EP500 I had the gain way to high, and when I ran some test tones, especially at very low freq's around 20 hz, the Woofer was really traveling in/out a lot, and producing a clapping like sound, as Wid described above.

I found I was running everything way to hot.
_________________________
M80s-VP180-QS8s-EP600-2xEP350 Denon3808 Outlaw7700
M22-OWM22-VP100-Denon2805
Audio Nirvana

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#141371 - 06/11/06 11:02 AM Re: EP-500 rattle [Re: SirQuack]
Billy_hk Offline
frequent flier

Registered: 03/08/06
Posts: 10
My receiver got a mic auto-setup. Using auto-calibration it will set LFE to about -6dB when it is 9'o clock on sub.
But someone told me the mic is not sensitive to low freq and advise to turn up the gain at least5-6dB. I feel overall watching movies is stunning except at time the subwoofer rattles and make me irritated.
Is that clapping sound in ep500 should be normal?

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#141372 - 06/11/06 11:18 AM Re: EP-500 rattle [Re: Billy_hk]
Wid Offline
axiomite

Registered: 06/22/03
Posts: 6720
Loc: The Peoples Republic of Il.
I would recalibrate the system and leave it as is. Turning the sub up 2 or 3 db should be ok but 5 or 6 is way to hot. Did you use a spl meter when turning the sub up ?
_________________________
Rick


"A fear of weapons is a sign of retarded sexual and emotional maturity." Sigmund Freud


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#141373 - 06/11/06 11:31 AM Re: EP-500 rattle [Re: Billy_hk]
SirQuack Offline
shareholder in the making

Registered: 01/29/04
Posts: 13337
Loc: Iowa


With my Denon, the auto setup microphone does a very good job with dB levels and distance settings. I have verified the settings with my SPL Radio Shack meter and they are very close to being correct. I think your Yamaha microphone will be pretty accurate. If you have the sub on 9 o'clock, I still think your AVR is set to high. You want all the speakers to be at the same SPL, this is where the Radio Shack meter is nice, you can verify your Auto Setup results.

There are some other Yamaha/EP500/600 owners on this forum. Maybe they will jump in here and give you their settings. My guess is that your still running to hot on the sub volume.

I don't think this is causing the rattling your hearing, but it may be enhancing the problem. As ken mentioned, you might want to check the screws on the back/front of the sub to make sure they are all snug. Air escaping around seals on the driver/amp can cause funny sounds. Or it could be as simple as a wire vibrating on the inside. I had a problem with my first EP500 and I could trace the sound to the back amp plate, the rattle was on the inside, so they sent me a new amp.

If you leave the sub at 9 o'clock, you'll need to lower the AVR to -6dB or more.

If you put the sub at around 7 o'clock, your AVR will be around -4dB or so.

As wid mentioned, trust the yamaha setup, maybe bump up the AVR a few dB, no more.

If you can buy an SPL meter from Radio Shack or online, it is a great investment to verify your settings.
_________________________
M80s-VP180-QS8s-EP600-2xEP350 Denon3808 Outlaw7700
M22-OWM22-VP100-Denon2805
Audio Nirvana

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