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Found the bass culprit in my monitor speakers...

Hello to you all. Months after months of changing the positions of my Leema Acoustics speakers only to hope to get better frequency response and bass output that was always lacking and missing in some certain frequency points. And then I hit this wonderful idea - let’s see what is inside. After opening the back of the speaker and admiring a really nice component crossover I took out about a 50cm long and 3cm thick acoustics wool out. The wool was literally stuffing almost 90% of the whole inside cabinet. Crazy (?) - and now this - after taking out the damping. More bass, more clarity, the great sound has come back again. Now the question - why did they stuff so much wool inside ? I think this is the main point why the users complain about bass output in Leema speakers. Secondly, I can suggest to anyone to experiment with damping inside. Sometimes it is not necessary at all I think. I think it is in closed enclosure speakers but not so much in back reflex port as mine ? I wonder what you think...
audiodav
erik_squires
16,049 posts
 
It is possible to overstuff speakers, but removing it should make it smaller and therefore increase the bottom end (at the cost of a faster rolloff).

I know at least one very experienced professional speaker builder (Lee Taylor) who thinks all stuffing is bad and removes the sense of impact and liveliness.


The best way to learn of course is to DIY your own speakers ... (evil laugh)

Best,
E
audiodav OP
12 posts
 
It is possible to overstuff speakers
Yes I think it is...I hardly believed how much acoustic wool I took out from such a small speaker.

I know at least one very experienced professional speaker builder (Lee Taylor) who thinks all stuffing is bad

Lol...I assume it is a nice sarcastic joke ;) Lee Taylor (from Leema) has built my speakers....

bdp24's avatar
bdp24
9,788 posts
 
The acoustic stuffing "tricks" the air inside the enclosure into "thinking" the enclosure is larger than it actually is (the stuffing slows down the air molecules). The size of the enclosure and amount of stuffing is part of the designer's tuning of his loudspeaker. To remove some or all of the stuffing is to redesign the loudspeaker. Are you a speaker designer? ;-)
geoffkait's avatar
geoffkait
23,365 posts
 
Removing the stuffing just sounds better. Been there done that. If the volume should have been larger maker it larger to begin with. Hel-loo! Stuffing is really a simple case of monkey see monkey do.
mijostyn's avatar
mijostyn
8,570 posts
 
The original paper on this was done by Acoustic Research in I think it was 1954. They released the first "acoustic suspension" loudspeaker shortly there after the AR-1. Before then most speakers were infinite baffle and much larger like Bozak speakers of the time which did not use any stuffing. 
bdp24 the air molecules "moving around" does not explain the increase in enclosure size perceived by the woofer . As I explained above it is a thermal-barometric principle.
Obviously, a speaker can be over filled which happens as soon as you start compressing the acoustic cotton. It has to just fill the enclosurewithout compressing it. 
I think "monkey see monkey do" insults the intelligence of many thoughtful speaker designers out there. An excellent manual on the subject is The Loudspeaker Handbook by John Eargle. 
Audiodav if you like the sound better than let the force be with you:)
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