OK that is what I would expect with a stereo source in the discrete mode as there is no rear channel information to reproduce.
Yes, just push one of the decoder buttons, QS Surround Is best for stereo.
Let's put it this way, when I owned a Pioneer QX-949A years ago, the stereo source, in discrete mode, produced a double stereo. If you wanted stereo only, you flipped the dial in the receiver to two channel mode.
I don't remember a "plus back" button on my 7001. The 9001 definitely doesn't have that.
I found it from the owner's manual! A good feature IMHO. One suggested use was for adjusting balance. Also useful for mono sources as the decoder can do nothing with them!
I would spend the money on a QSD-2 or (QSD-1). Then use a separate amplifier (or amplifiers). I love separate components!
It will be a bit easier for me to find a 7001 and I know they tend to have less issues than a 9001. I thought the CD-4 demodulator in the 9001 was better but it is a moot point for me as I don't plan to get back into vinyl. I plan to use my Oppo play with it.
Good question, I remember them as being manufacturer of direct drive turntables "back in the day". Amplifiers and receivers seem to be from the nineties onward.
No answer, in fact I've had my finger on the pulse of multich since the beginning and had to google UD4.. Can't say I ever remembered hearing about it unless I read some obscure article
UD-4 was created, by Denon, to be a system that could play in a matrix format, up to discrete, depending on the sophistication of the playback system. For discrete, it used a carrier-based method, similar to CD-4, with the matrix-encoded base band carrying a similar front plus rear approach. Denon marketed a demodulator for it in Japan that also had a CD-4 mode. For simpler systems, the matrix in the base band could be decoded, with or without logic, to present a quad soundfield. Mike Oldfield's "Tubular Bells" was released in Japan as a UD-4 title.
I have the same WITH a Quadbob 9001 connected to the preamp inputs. Technics Sl-1900 table with the AT440mlb. Also have a Sansui qsd-1 for when I prefer the original sansui sound. I use a jvc 4dd-5 for cd-4 with grundig and marantz for backup. A dbx-II 124 for dbx discs. A harman kardon model 8+ and a jvc deck for Q8s, teac 4 track reel deck and akai and sony 2 track reel decks. Also have a 5 band 4 channel BSR eq in play.
