Sound emission from 4 sides of speaker enclosures.

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Does anyone have any information on how sound emamantes from speaker enclosures?

I have built three enclosures so far out of corrugated cardboard and hardboard, I am going to try plywood next, but I need to obtain better bass from my speakers.

I notice small sat-subwoofer PC speakers produce a lot of bass from a small ported boxes with less footprint than an A4 paper. Some have the speaker driver totally enclosed.

Specifically - how much sound and what frequencies are transmitted by the four sides of the box? How much is transmitted back through the speaker cone, and could these include the lower frequencies as well? How does padding the inside of the box create more bass?

I can understand that lower frequencies may resonate within the speaker enclosure, and this is confirmed by placing a small speaker in a totally closed box - even an cardboard shoe-box but I need to know where the sound radiates out from to manage these sounds and create a more effective desing.

I have not been able to find much information so far

This is interesting:

The Vibration Speaker. Massively Powerful Surface Speakers
 
A study of the ESL57 will provide you with a
different look at speaker cabinets or lack of them
https://www.youtube.com/watch?v=cRUTCu6zElg

A look too at these many designs suggest many
exciting ways of doing sound reproduction where in some cases a lack of
conventional cabinets becomes apparent to being perhaps a better approach.
The 12 Most Significant Loudspeakers of All Time | The Absolute Sound

Ira Gale famous for his gale GS401a speaker settled after converting an
entire wall in his apartment, to trying different baffles, on a design inheriting
the ESL57's use of bass drivers either side of a midrange and tweeter.
GS401 Speaker | galeaudio.com
He also used in this speaker the famous acoustic suspension principle invented by
Edgar Villchur https://en.wikipedia.org/wiki/Edgar_Villchur

Perhaps some of these ideas might be useful to you, hope so

Cheers / Chris
 
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