He meant
THICK not THINK.
Yes, basically.... 'What he said'.
You will not be able to eliminate the standing wave problem, but with proper treatment you may be able to get it under control... and deal with what's left.

__________________
John H. Brandt
Recording Studio Design/Consulting, Acoustics, & Electronics
Jakarta, Indonesia
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"Twenty thousand dollars worth of Snap-On tools does not make you a Professional Diesel Mechanic"