Ethan Winer wrote:

One of the ironies of small room acoustics is construction
that improves isolation harms the low frequency response
within the room.

No. A flexing floor or ceiling does great harm to the bass by causing a
dip as well as a resonant smear AND conducts with hardly any
attenuation. A rigid room boundary is generally preferable unless we are
speaking about a wooded structure with a "non resonant" or
"multiresonant" looseness.

All room acoustic problems are caused by reflections
of the walls, floor, and ceiling.

All is not usable, many and even "most applies. The other great issue in
the bass range after flexing floor/ceiling is flexing window panes.

Normal sheetrock walls absorb some amount of low frequency
energy, especially if there's fiberglass between them. And
some of the energy passes through to the other side.
When you make the walls double thick they are
more reflective and to a lower frequency. So now you need
even more bass traps than usual to absorb and reduce
the damaging LF reflections.

The manual for the DM2a's (that I should have kept) recommended a
solidly built ground floor room. A flexing room-structure does not in my
opinion and experience allow a proper punch in the bass. Proper bass
build up in a room allows easy tonal balance correction - for instance
via cross-over adjustment or tone control(s), narrow leaky ranges makes
things a lot less simple, also in my understanding of your resistive
traps for them to do a good job.

--Ethan


Kind regards

Peter Larsen


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