I doubt that a wood wedge/panel in back has any perceptable effect on sound. Martin went to the 3-piece on the D-35 because it was getting hartder to find sizeable Brazilian pieces back in the mid-60s. How the panel is braced might have an effect, though probably not something I could hear. But cosmetically it works and I can remember a time when everybody had to have a D-35.
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Martin OM-42SB
MJ Franks 000-12 Brazilian/Carpathian
J Kinnaird 000-12 Birdseye/Sitka
Flammang SEL
SCGC 00-12 EIR/Sitka
SCGC OM Mahogany/Moon
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