Axiom Home Page Forums General Discussion Advice from Axiom Owners My tweeters have sprung a leak!

Understand that this is a joke... I have great respect for the engineers who built/work on the space shuttle.

My 'problem' is no different than described by sirquack and johnk.

glad to know this is normal.

I do however still notice somewhat of a rattle coming from my sub.

I thought I had fixed the issue by tightening the amp plate. It pretty much did resolve the rattle, but on very demanding explosions and such I can hear a rattle. It only happens when I am playing at LOUD volumes (sorry I have not taken an spl reading). It is more apparent when I up the gain on my sub via the denon from -10db to -8db which I often do for movies.

it sounds like the rattle is coming from the back of the sub. Usually when I put pressure on the amp plate it goes away. However, there was one particular time when it sounded like the entire box was going to rattle apart.

I need to decide if this is something to call axiom about or not.

When you say -10dB are you talking about the receiver sub levels, or the main volume? That seems pretty low. Normally, you want to be closer to 0dB and have the volume(gain) on the back of the sub lower. Maybe your running your sub volume to high and creating rattles, not sure.

My old amp, a Kenwood M2a, had this hiss you speak of. My current amp, a Rotel RB 1080, is dead quite.

I told you to put a beaver on your sub. Failing that, use a chunk of granite.

The hiss (junction noise from transistors/FETs) is perfectly normal. Just don't get speakers that have a sensitivity of 120dB/W/m.

sirquack, I have the volume knob on the ep 500 set at about 7 oclock. I used the 3808 audessey auto set up- it set the at -10db in the denon. Verifying with an SPL meter the sub was pretty close 75 db along with all of the speakers.

Mojo, I am not sure that applying weight on the top of the sub fixes the issue. Pressing on the back generally does.

>>I need to decide if this is something to call axiom about or not.

If you're not sure, call Axiom

Have you tried sticking your arm in the port to see if the rattle is coming from the port tube ?

The rattle I initially heard was audible from my couch and it was higher pitched. It occurred at moderate to low volumes. This is gone after tightening the amp plate.

I watched a few clips from an LFE demo dvd that i obtained from AVSforum. Some clips were from the haunted, star wars episode II, and finding nemo.

I checked the output during some of the starwars explosions and peaks were near 100 db from my listening position. The rest of the movie was around 80 db, but peaks at about 97 occasionally. I guess what I am hearing for the most part requires me to walk up to the sub to hear it. A particularly long rumble from the haunted caused the vibration/rattle sound on the back of my subwoofer (this sound was audible within arms reach of the sub at normal listening volumes. If I cranked up the main receiver volume and upped the gain of the sub a little through the denon from -10 to -8db it was auidible from my couch) This rattle/vibration noise will completely stop if I press on the back of the sub or the side of the sub towards the back. I do not have to press on the amp plate directly.

So it seems that if I have to walk up to the sub during a 100db explosion to hear a rattle that is no big deal right? I just don't want to hear anything coming from my sub but LFE... what do you think?

short of sending a completely new ep500 I do not know what axiom could do for me...

Try Mojo's suggestion and put something heavy(10-20lbs) on top of the sub to see if it helps. It does sound like an enclosure vibration. Maybe Axiom needs to beef up their bracing.

LOL!!!!!