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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
mijostyn's avatar
mijostyn
8,570 posts
 
Audiodav unfortunately not a good idea. The acoustic filling in speakers essentially makes the enclosure seem about 30% larger to the woofer than it actually is lowering the system resonance frequency and improving low bass frequency response. It is a bit hard to explain but it does this by making the system more isothermal. When air is compressed it heats up further increasing pressure. The opposite is true under vacuum. The stuffing absorbs this heat on the compression stroke and releases it under vacuum stabilizing the temperature inside the enclosure making the enclosure function as if it were larger. What you have done is decrease the low end reach of your speaker and raised the resonance frequency which is going to increase the volume of the midbass which is what you are hearing.

Mike
audiodav OP
12 posts
 
Thanks Mike. Good to know it from the profi side. All in all, this has improved muchly the sound for me. Interesting. Maybe the midbass was the issue and the trade off is about improving it. 
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
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