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... sound batting and/or weighting speakers ...

Hello to all... 

Need some thoughts and/or suggestions: I am using a pair of KEF Q1s - luv the sound, so much more full than I ever expected - and the driver has such cone extension that the speaker box really vibrates. Now - I am assuming that the vibration really = the possibility of distortion ( or a smearing at higher volumes, tonal deformity, if that is different) and I am wondering if this is more controllable by:
Adding more sound batting into the enclosure (thru the bass port)
Weighting the speakers with a bag of lead shot (?) over the top of the driver/cabinet box ( the cabinet is not flat on top, so I can't use a brick or solid weight; I'm guessing the weight should be something moldable, so the lead shot in a bag is possible if I can figure a way to affix it to the cabinet...)

Thoughts? Suggestions? Alternates?
insearchofprat
tomic601's avatar
tomic601
13,017 posts
 
the reality is the OP can do both.

I think it was 1985 when i built a cabinet within a cabinet and air core crossover for a KEF 104 a/b customer all wired with Fulton....ran rings around the factory 104....... but not the Cantata...

OP have any appetite to do both ????? upgrade and tweak ?
onhwy61's avatar
onhwy61
5,254 posts
 
Are the screws attaching the driver to the cabinet tight?

You say you love the sound of the KEF, so why try to change the sound?  Stuffing any type of dampening material inside the loudspeaker will radically change the loudspeaker's sound.  You'll be changing the internal volume which at the very least will change the bass response.  I think I understand what you are trying to do with the lead shot, but why not just wrap it alternating layers of duct tape and bubble wrap.  Either solution will only slightly mask the real issue inherent in the KEF's cabinet design.  All box loudspeakers experience cabinet vibration and it's not necessarily a bad thing.  If I were you, I would just continue to love the sound and stop worrying about the vibration.
mijostyn's avatar
mijostyn
8,570 posts
 
There are three reasons enclosures dance, The cabinet is too light, the cabinet walls are not stiff enough and lastly the cabinet is not firmly fixed to the floor. #1 add mass. Put a granite slab on top of the speaker. You can get cut offs cheep at your local granite installer. #2 This one is tough. You would have to thicken the enclosure walls. At that point you may want to consider another speaker. #3 Put three spikes on the bottom of each speaker and jamb them right into the floor. This assumes your floor is reasonably solid. Good Luck.

Mike
mijostyn's avatar
mijostyn
8,570 posts
 
Oh, I forgot one more solution. Get two subwoofers and take the bass away from those speakers.
audioman58's avatar
audioman58
4,203 posts
 
I have  monitors and subs I massed load these and truly focuses the details.
i measured the dimensions went to a place that does granite countertops and picked out the granite I got Gee edges and just put a little blutac on top the granite adds a lot of mass and looks great I bought blue pearle from a Norway for $200 for the monitors, and $100 for each sub.
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