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Subwoofer Rattle Help

1.9K views 8 replies 3 participants last post by  RayGuy  
#1 ·
I’m hoping I can get some advice about a subwoofer rattling issue I’ve been having.

My audio setup is 5.1, using Polk speakers and a Yamaha 1080. My sub is a front-firing Polk PSW505. Looking at the pictures, you can see that the way my living room was constructed, there are some limitations - but I work with what I have. My two surrounds actually are in the ceiling, directly above where I’m sitting - as there’s no way to put them behind me.

Anyway, for the most part, I’m happy with my audio. I had my whole system calibrated a few years ago, so the speaker settings are all accurate, including the sub. However, since I don’t really have a lot of room with sub placement, I bought a long cable and currently have my sub sitting behind a chair in a far-left corner of my room. The location of the sub cannot be pin-pointed while playing audio - unless, of course, someone is sitting in the chair that the sub sits behind - which is never.

Unfortunately, my complaint has always been the rattling that I get whenever I’m listening to movies very loud. It doesn’t always happens and doesn’t happen regularly, but when the rattling occurs, it’s distracting and frustrating that I can’t get it to stop.

I know that my sub isn’t turned up too high. It was set maybe a 2/5 of the way up on the volume knob when it was calibrated and I’ve never felt that it’s too harsh. I make sure there’s a bit of a gap between the chair and the sub, although I’m not sure if that makes a difference. I’ve pin-pointed the rattling to the plantation shutters nearby, so it’s from wall vibration. Obviously, removing the shutter is a no-go and even modifying the shutter with some type of foam seems very tricky.

One of the things I read about are these “systems” you can buy to help raise the sub off of the floor a bit. I tried this item (linked below), an acoustic isolation stand, but it did not really make any difference at all.

https://www.amazon.com/gp/product/B00F3JJ9DM/ref=ppx_yo_dt_b_asin_title_o02_s00?ie=UTF8&psc=1

I’ve also seen those foam pads, as well as other “pegs” to attach to the bottom - but I figured that if that stand doesn’t work, the other items won’t work either. I’m going to retile the nearby dining room and kitchen this summer. I intended to leave carpet in the living room, but I’m wondering if tile would make a difference at reducing the vibrations. I’m guessing it won’t make a difference, but I was curious.

Do you guys have any suggestions of what else I could try?

I tried moving the sub next to the couch, sitting it directly under a side-table, but that didn’t really make any difference with the rattling.

It’s frustrating, because it makes me sort of wish, in the beginning, I just would have went with a soundbar and a tiny sub. But I’m convinced that there has to be some way to fix this.
I did stumble upon a post from 10 years about someone who had the same issue with his plantation shutters rattling, but I don’t think he ever did find a solution.

I’m open to any suggestions you guys might have.

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#2 ·
When I initially set up a subwoofer, I like to run a test of frequency ranges through the sub. Different items in your space will resonate at different frequencies. Perhaps it is not the overall volume, but a specific frequency at volume that is reacting with your shutters. At least this way you could further isolate the issue in order to come up with a solution.

Below is an example of a frequency range test.

https://youtu.be/fwrbFj9r10Y
 
#3 ·
A few additional thoughts.

If the shutters are indeed resonating to a specific or narrow set of frequencies, it may not be that difficult to defeat the resonance. It looks like they are attached by three hinges to the window frame. If you were to place small rubber spacers between the hinge plates and the window frame, it could very well eliminate or at the least significantly alleviate the issue.

Imagine a tuning fork attempting to vibrate with a peice of rubber set against it. Good luck!
 
#4 ·
Thank you. Once I am home, I will run that test and that might give me a better idea. Because I know it doesn’t happen with all loud bass, only some instances.


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#8 ·
It does, but I prefer not to lose anything.

I ordered some sticky putty and am going to put a tiny bit behind the rods that rattle (only a couple of them do this). Since the shutters stay closed, I’m hoping it will help. Because if I hold the rods still with my hand (or wedge a small piece of paper towel folded up under the rod), the rattling stops.


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