The new ZM props are quieter - they also are listed as having higher pitches - which makes sense - performance is stil about the same bit you can't get em to RIP-- My 42%, 39 lb pig is turning a ZM30x14 at 66-6700 in the air level flight and still quiet - will also stop start vertically and accelerate up - I also prefer Mezjlic to any of the wood stuff - in holding noise down
The wood props I have run are all noisy -if allowed to run at full throttle in level flight .
coupled with the big JMB cans -very quiet --same thing on my 80 single on the 26x12 - no rip -it gets louder but never that friggen blatt from the tips going into spank mode.