Sub rattling entire house - AVS Forum | Home Theater Discussions And Reviews
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post #1 of 19 Old 06-28-2020, 07:30 PM - Thread Starter
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Sub rattling entire house

I just started building my first ever HT system and have really enjoyed it so far. I bought an HSU VTF-3 MK5 and it's a BEAST. It has a very big room (27X28.5) to fill and It sounds pretty good. I am still trying to figure out the best settings for my large room.

My wife has been complaining that the bass shakes the entire upstairs. I went to investigate and sure enough everything was shaking. Appliances, china cabinet, ect. What can I do to reduce the bass in the upstairs of the house outside turning it down? Sub is currently sitting on a carpeted concrete basement floor, so I am not sure if an isolation mat would help?
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post #2 of 19 Old 06-28-2020, 08:34 PM
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You can try moving it around to see if it transmits less at another location in the room. Otherwise, without major reconstruction, negotiating loud bass time or turning it down are the only solutions.
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post #3 of 19 Old 06-28-2020, 08:59 PM
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The lowest frequencies are typically what make things vibrate around, but they are also the most fun. You could turn on nightmode, or Audyssey LFC, but it neuters the deep bass.

If you are on the basement slab a subwoofer isolation mat will do nothing -- because the concrete slab is not transmitting any vibration to the rest of the house. The isolation mats are really made to help dampen acoustic energy transferred to a wooden/suspended floor.

Just show her this, and tell her it could be worse.

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post #4 of 19 Old 06-29-2020, 07:20 AM - Thread Starter
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Thanks for the awesome video. That is insane. Filling an entire room with 151db? Wow. I use to be in car audio and getting that small cabin to 150db was always an achievement.
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post #5 of 19 Old 06-29-2020, 11:45 AM
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"I bought a Porsche and it goes too fast!" Lmao
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post #6 of 19 Old 06-29-2020, 11:53 AM
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Quote:
Originally Posted by wickflair View Post
My wife has been complaining that the bass shakes the entire upstairs. I went to investigate and sure enough everything was shaking. Appliances, china cabinet, etc.
Congratulations... you have achieved Bass Success!! There is no problem.



But seriously, though... maybe you were expecting less from that subwoofer but it's actually doing its job.
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post #7 of 19 Old 06-29-2020, 12:50 PM
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Sounds like a good start!

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post #8 of 19 Old 06-29-2020, 01:06 PM
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And if only everyone had the same "Problem"..
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post #9 of 19 Old 06-29-2020, 04:00 PM - Thread Starter
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Oh it's not a problem to me. I was in car audio for years and rattle was a good thing lol. Just wasn't sure if there was anything to help keep the sound in the basement. Didn't assume so, but wanted to see what people suggested if anything.
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post #10 of 19 Old 06-29-2020, 04:45 PM
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You can try several things without spending much money. First off try some different placement. Putting the sub in corner will boost bass response over some frequencies but that can result in what you are describing. Try putting the sub nearfield to the main listening position. Maybe even putting it directly behind the couch or something like that. Test and see if there is any difference.

As far as isolation goes, you can test that without any fancy pads. Just fold up a few beach towels and out the sub on them. This will essentially isolate the sub from the floor. Test and see if there is any difference.

You have a VFT, so use the VTF part of it. Try plugging all the ports. This will cause the bass to roll off more on the low end which might help with the rattle.

Finally find what is rattling the most and figure out what you can dampen. For us, wall mounted things tend to rattle more than others. Using some felt furniture pads on the picture frame backs can help with this. If your cabinet doors do not have rubber stoppers on them, install some. Consider putting down some shelf liner where the dishes are rattling (again, a towel will work fine to test).

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post #11 of 19 Old 06-30-2020, 06:55 AM
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A good set of headphones is the only solution.
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post #12 of 19 Old 06-30-2020, 07:05 AM
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Quote:
Originally Posted by wickflair View Post
Oh it's not a problem to me. I was in car audio for years and rattle was a good thing lol. Just wasn't sure if there was anything to help keep the sound in the basement. Didn't assume so, but wanted to see what people suggested if anything.

Maybe try getting the door to the basement sealed air-tight.

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post #13 of 19 Old 06-30-2020, 07:18 AM
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I recently upgraded from a Bic F12 to the Hsu VTF3-MK5 and had the same rattling/vibrating problem.

I purchased a few packs of Blu Tack and played some heavy low bass songs while my wife and I walked around the house "tacking" anything down that made noise.

It made a huge improvement!
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post #14 of 19 Old 06-30-2020, 07:35 AM
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Quote:
Originally Posted by badtlc View Post
Maybe try getting the door to the basement sealed air-tight.
The problem is that Low frequency wavelengths are very long(often longer then the room) and that makes them hard to contain... which is why when you place multiple subs in a room they almost always mutually couple below 40hz. Higher frequencies can be somewhat contained, lower frequencies below 40hz or so is almost impossible. Prime example, turn on some bassy music at high levels and walk around the house. You will notice that most of the upper frequency chest thump bass stays in the room, but as you move around the house you will notice those frequencies diminish and all you will hear or feel is the deep stuff.
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post #15 of 19 Old 06-30-2020, 07:36 AM
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I have 4 subs in the HT room, and now since everyone is working from home, it's too much low end. A few things I tried which seemed to help:

1). Moved the subs out of the corners (also changed from down firing to front firing).

2). Changed the settings in my SR Marantz to light compression and manage bass option. There is also a night setting.

3). Pulled out my old ButtKicker kit, and put that in the mix. I can still have bass w/o a bunch of complaints.

4). Recalibrated audio using Radio Shack analog meter @ 75db (Old School).

Now I don't get the chest pounding bass I use to, but it's a good sacrifice in order to maintain peace. One day when everyone is out of the house, I step it up for a few hours, but until then.

Peace and blessings,

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post #16 of 19 Old 06-30-2020, 07:53 AM
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Quote:
Originally Posted by wickflair View Post
I just started building my first ever HT system and have really enjoyed it so far. I bought an HSU VTF-3 MK5 and it's a BEAST. It has a very big room (27X28.5) to fill and It sounds pretty good. I am still trying to figure out the best settings for my large room.

My wife has been complaining that the bass shakes the entire upstairs. I went to investigate and sure enough everything was shaking. Appliances, china cabinet, ect. What can I do to reduce the bass in the upstairs of the house outside turning it down? Sub is currently sitting on a carpeted concrete basement floor, so I am not sure if an isolation mat would help?
Short of a major sound proofing, there's nothing you can do to fix the bass shaking the rest of the house short of turning the bass down.

To that end, you can substitute a lot of your bass with shaker systems. A properly integrated shaker system will still shake you giving you the feeling of loud bass even when you turn the bass down. And since these shaker systems don't actually play any bass, there's no vibration in the house.

There are many solutions. The one I'm currently using is having an infinite baffle sub mounted open air in my main chair. This provides both sound and feeling. I can hear the subwoofer while sitting in the chair. I cannot hear it *at all* once I stand up.


Another option is to mount something like an earthquake MQB-1 to your chair. This won't provide any sound but will provide vibration. It will allow you to turn your sub down some while not feeling like you lost out - in fact you may even feel like you've gained.
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post #17 of 19 Old 06-30-2020, 08:17 AM
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Quote:
Originally Posted by basshead81 View Post
The problem is that Low frequency wavelengths are very long(often longer then the room) and that makes them hard to contain... which is why when you place multiple subs in a room they almost always mutually couple below 40hz. Higher frequencies can be somewhat contained, lower frequencies below 40hz or so is almost impossible. Prime example, turn on some bassy music at high levels and walk around the house. You will notice that most of the upper frequency chest thump bass stays in the room, but as you move around the house you will notice those frequencies diminish and all you will hear or feel is the deep stuff.

in my testing, getting the basement door sealed air tight drastically reduced the vibrations of items on upper floors not directly connected to the ceiling structure of the basement.

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Center: Polk S30
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post #18 of 19 Old 06-30-2020, 09:22 AM
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You could build a wooden riser to put under you MLP make it large enough to place your sub nearfield (behind couch). Download a tone generator app on your phone and pick a reasonable volume so you dont blow your sub. Go upstairs and manually start at 100/80Hz going down a Hz at at time until u hear your first rattle. You can hold that frequency and try and find the rattle source and hopefully fix. Repeat for the rest of the bandwidth down to port tune. This should help and be cost effective.

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post #19 of 19 Old 07-01-2020, 04:48 PM
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Quote:
Originally Posted by Archaea View Post
The lowest frequencies are typically what make things vibrate around, but they are also the most fun. You could turn on nightmode, or Audyssey LFC, but it neuters the deep bass.

If you are on the basement slab a subwoofer isolation mat will do nothing -- because the concrete slab is not transmitting any vibration to the rest of the house. The isolation mats are really made to help dampen acoustic energy transferred to a wooden/suspended floor.

Just show her this, and tell her it could be worse.
https://www.youtube.com/watch?v=vatf5UNqZkk
Everytime I feel I've reached the point I've built enough subs, a video like this surfaces

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