Another 4th order subwoofer installed on my new gaming Desktop recently ... This subwoofer has 2 down firing ports and it uses 1 unit of homepod 4.5inch woofer unit ... The woofer does goes very low in this setup BUT the cabinet (to the left) and the computer unit were suffering from serious rattling and buzzing caused by those bass notes which can be annoying at times ... Any solution to go around this? Thanks
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A homePod died for you to get you woofer :^(
Cabinet can be dealt with, but that has to be fixed at the source. Could be the box or an inherent flaw in the box design.
Sympathetic room/furniture vibrations ar emuch harder to deal with.
dave
Cabinet can be dealt with, but that has to be fixed at the source. Could be the box or an inherent flaw in the box design.
Sympathetic room/furniture vibrations ar emuch harder to deal with.
dave
I do have tone generator app on my android phone ... Later evening might run a sweep tone ... The furniture is the most troublesome as it sits beside the subwoofer ... This type of old furniture is only using a small thin layer of plywood as the larger panel where the rest were all frames 😅🤣
Side note: are those ports facing the floor? If so it looks as if the feet are not tall enough to allow enough room for them to function as they should...
Ya the excursion problem was still there ... I end of decided to use no more than TPA3116D2 output power ... Which is close to much the woofer could take before it makes harmonic distortion
Yes they are floor firing ports ... Only about 0.25 inches height 😅 it is a 4th order bandpass system 😅
I find a contiuous sinewave sweep from 5-100 (or nore) Hz into the sub will get
everything rattling. Sound absorbing sheets added to computer panels will change
the tuning and get rid of rattles one at a time. Tedious but doable.
I make the test signals in Adobe Audition 3 but I'm told Audacity can do it for free.
That online tone generator is even easier. Good luck.
G²
Just saying that typically you would want more space between the port and a boundary. Having a boundary that close will effectively become an extension of the port and change the tuning.
At a minimum I would keep the space equal to the port diameter (2 inches in your case) but 2 times the port diameter would be safer. Comparing measurements with no boundaries to your setup would be the only way to tell how much it is affecting your port tuning.
I just use REW tone generator and do 0.5hz increments from 20hz to 60hz and there are a few tones that have obvious resonance/oscillation with some items/objects in the room. If you make the particular tone high SPL you will get a louder rattle of course but then you can easily identify the object and isolate it better. Cleaned up my office that way.
Very best,
Very best,
Dual 2" dia. ports = 2*sqrt(2) = ~2.83" eff. dia.
2.83*1.23 pipe end correction = ~3.5" min. gap
I would dampen the box first.
Are the speakers decouple from the room? Are the speakers on the floor?
DECOUPLE first with Springs, pods, air ride. NO POINTS. I would start there.
Everything that is rattling put that on Springs, pods, or air ride. No points unless they are on Springs, Pods, or Air ride.
It's a mechanical issue start there. Limiting the frequency is an option I suppose if you need a rumble filter for a TT maybe.
Things rattling is easier to fix at the source. Mass loading the cabinet and then decoupling?
Regards
Are the speakers decouple from the room? Are the speakers on the floor?
DECOUPLE first with Springs, pods, air ride. NO POINTS. I would start there.
Everything that is rattling put that on Springs, pods, or air ride. No points unless they are on Springs, Pods, or Air ride.
It's a mechanical issue start there. Limiting the frequency is an option I suppose if you need a rumble filter for a TT maybe.
Things rattling is easier to fix at the source. Mass loading the cabinet and then decoupling?
Regards