While we wait gentlemen
Yes the DB is certainly nice sounding.
I did my sevice on MTB:s with three Isotta Frachinis W18 airplane engines that had similar compressor construction as the DB:s, one on each side at 90 deg from the main-shaft, and they had the same whining sound when running idle. At full throttle you couldn't hear yourself think.
The Merlin have, iirc, the compressor mounted in line with the main-shaft at the aft end of the engine and this is probably the reason to why they sound so differently.
Regards
Viking
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