• QuadraphonicQuad welcomes you and encourages your participation! Treat all members with respect. Please keep all discussions civil, even when you have a strong opinion on a particular topic.

    Do not offer for free, offer for sale, offer for trade, or request copies or files of copyrighted material - no matter how rare or unavailable to the public they might be. We do not condone the illegal sharing of music. There are many places on the internet where you can participate in such transactions, but QuadraphonicQuad is not one of them. We are here to encourage and support new multichannel releases from those companies that still provide them and as such the distribution of illegal copies of recordings is counter-productive to that effort. Any posts of this sort will be deleted without notification.

    Please try to avoid discussions that pit one format against another. Hint for new users: make liberal use of the search facilities here at QuadraphonicQuad. Our message base is an incredibly rich resource of detailed information on virtually all topics pertaining to surround-sound. You will be surprised at what you can find with a little digging!

Chat with Larry Fast part 3

Help Support QuadraphonicQuad:


Super Moderator
Staff member
QQ Supporter
Since 2002/2003
Oct 18, 2002
College Grove, TN
Oct 7, 2017

TIM: “Good day Larry, just a couple ideas as a fan and musician, if I may?
Try to include the legacy quad mixes, demos, etc. on discs. Stagger the releases, have pre-order periods, sell more units that way. Regards, Tim

LARRY: “I’m trying to derive the quad mix from the QS encoded stereo master. The discrete 4 track masters were lost by the record company decades ago. There is a 24/192 digital copy of the original non-EQ stereo master and I have a QS decoder. It may be possible.

Release cycle and timing are the province of the distributor and their marketing plans. Currently with SonyRED, but possibly a new distribution arrangement elsewhere coming early in 2018.

Thanks for the thoughts.”

TIM: “Cool. Be advised that there is now a Surround Master decoder that does a KILLER job of QS decoding! Some say better that software scripts and maybe better than Sansui QSD1.” 👌🎶

LARRY: “All I have is the original hardware from 1974 supplied to the studio by Sansui--still working, but a pro-sumer level product, unbalanced I/O). Please tell me more about this decoder. Any idea about the circuitry inside?”

TIM: “I'm doing a work event in Florida right now but I will send you a link with details later this evening.”

LARRY: “Thanks. The 4:2:4 encoding/decoding is a pretty basic technology, so I'm curious about what they're doing differently than 45 years ago.”

TIM: “Try this for starters: http://involveaudio.com/product/surround-master/
We have detailed discussions on our quad forum as well.”

LARRY: “Interesting. On SurroundMaster's site tech page it looks like they've patented a method for splitting the signal into three frequency bands during decoding before recombining into full-bandwidth audio output signals. I can see why they'd do that to derive subwoofer and center channel information from quad, but for a straight 2:4 decode from stereo I'm not sure it's necessary. Helpful for a simplified surround consumer product, though.”
Group builder