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Speakers making floppy/rattling sound at low frequencies

functious

Active member
Apr 17, 2021
7
1
25
I have some Mordaunt Short MS20i Pearl Edition speakers which sound good, apart from the fact that when playing a track with very low frequencies they make a floppy/rattling sound which completely ruins it. What could potentially be causing this? Is it common for speakers to do this for bass frequencies that are out of their range?
 

RoA

Well-known member
Feb 11, 2021
155
67
170
Great speakers. Remember them fondly. Based on a Marshall design. I had mine for some time.

As to the rattle ... it may be a cable internally that flops around in tune with bass at high volumes or the driver has worked loose. Tape cables together internally or/and wrap them in foam. Tighten the wood screws.

It could be a damaged driver but I'd try the above first.
 

nopiano

Well-known member
Feb 15, 2009
727
453
19,270
Are you playing a CD or LP? Records often produce subsonic noise that stresses amplifiers and speakers.
Your MS are pretty old aren’t they? Ported speakers aren’t well damped, and if you remove the front grille you can look at the cone movement and possible physical damage - like a rotting surround.
 
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functious

Active member
Apr 17, 2021
7
1
25
Are you playing a CD or LP? Records often produce subsonic noise that stresses amplifiers and speakers.
Your MS are pretty old aren’t they? Ported speakers aren’t well damped, and if you remove the front grille you can look at the cone movement and possible physical damage - like a rotting surround.
No I've only ever used them connected to my pc.

I can't notice any physical damage to speak of. I'm also getting the exact same issue with both speakers.
 

functious

Active member
Apr 17, 2021
7
1
25
No I've only ever used them connected to my pc.

I can't notice any physical damage to speak of. I'm also getting the exact same issue with both speakers.
Actually I've had a closer look and the edge of the speaker cone appears to be loose and flapping around somewhat. How are these best secured down?
 
Last edited:

Al ears

Moderator
I am curious as to what you actually have them connected to, you mention PC but what is powering them.
if the edge of the come has come away then the only thing you can do is replace the whole driver.
 

insider9

Well-known member
Sep 20, 2016
993
495
5,270
Actually I've had a closer look and the edge of the speaker cone appears to be loose and flapping around somewhat. How are these best secured down?
Easiest is to touch the cone during playback as the issue is taking place. Will this stop what's happening giving you a clean sound?
 

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