Vintage Denon Direct Drive Turntable

S/N Ratio: DP-80 S is 77; DP-75M is 80dB
Wow/Flutter: DP-80 is <0.015%; DP-75M is < 0.008%w.rms
The JIS measure shows both below 0.02%.
I don't know how rumble is measured.

Wow and flutter (originally separate measurements, now put together) measure the level of frequency instability below and above 4Hz of wobble. I read once a long time ago that the weighting system of measurement tends to be inaccurate at high wobble frequencies, making it effectively meaningless. I have thought that this is one reason why high mass platters are supposed to sound better on almost every kind of drive system - they effectively reduce the possibility of high levels of high frequency flutter.

As for levels vs the competition, it was quite good (there weren't many tables made which spec-ed better) but several tables were similarly below 0.015% or 0.1%.

Thanks, T bone. I had seen those numbers for S/N in Denon literature. I look forward to the DP80 listening experience, if I can ever find the time to make or have made a plinth for it.

T_bone, I found an old Denon add for the DP 80 which list the Wow/Flutter at 0.008 wrms and the SNR at 80 db. I assume your data was from independent testing? The Denon numbers are better but may have been influenced by the marketing/sales staff.

Dunno. Can't account for the difference. I was quoting from notes I made last year (I looked it up last year when I was doing research on Japanese DD TTs from the 70s and 80s) but just now checked over at the Vinyl Engine website and found an English-language brochure for the DP-80 giving the same numbers I previously noted. Perhaps things were improved in the latter years of production and that is where your ad comes from. FWIW, the brochure provides a great deal of info on how the thing was designed and built - very instructive in its own way.

I've got the same brochure that Tbone is talking about, from the Vinyl Engine. The one for the DP80 does quote a 77db S/N ratio, as he says. Both 77db and 80db are well below the S/N ratio of any LP playback system, so noise per se is not going to be the issue with either the DP75 or the DP80. The question is how do these two tables sound, in general, with a high quality tonearm and cartridge in a well conceived plinth. I perceived two issues with the DP80 cum DK300 plinth: (1) The chassis is fastened to the deck with only three short wood screws, i.e., the coupling is suboptimal. (I think I mentioned this elsewhere in this thread; sorry. This can be ameliorated with better fasteners and/or more fasteners.), and (2) The DP80, like all Denon DD tts that I have seen, has a hollow cosmetic ring around its circumference, which would seem to be a source of resonance or possible coloration of the signal if energized. (Again, I mentioned this before; I "cured" the problem by inverting the chassis and filling the hollow inside of the ring with potting material I rescued from an old KLH 9 power supply.) But this is all twaddle until I get a chance to listen to it.