Anybody know anything about the Marantz SD400 cassette deck? 2 speed?

If you want to make higher quality recordings, get a Nakamichi.

LOL
I have three Nakamichi decks
Just was very curious as to this particular machine and/or the very principle of 2 speed cassette decks as a new one on me.

Seems like Nakamichi made  a 2 speed cassette deck. Can't remember model number and I think it may have been 1/2 of the normal speed.

tls49

...  Nakamichi made a 2 speed cassette deck. Can't remember model number and I think it may have been 1/2 of the normal speed.

Yes! The Nak 680 had a half-speed, 15/16 ips option. 

The Marantz is different then as its has double speed for higher sq I assume not half speed.

Found a few threads on 2 speed cassette at Tapeheads.
Only the Nak had half speed,the rest by Marantz, Teac, Tascam, BIC. Etc all had the double speed option.
By all accounts it did improve sq a fair bit,not sure what stopped it catching on apart from maybe that car cassette players were all fixed at normal speed.
Guess this is where most home recorded tapes ended up being played, I know mine did...lol.

Still the idea has merit as long as you then play back on same machine. Now you would get one side of vinyl per cassette side of a 90 roughly.

Sounds interesting to me.