A nice looking Decoder no real info on it …...link to site
I wonder if this was a kit set project
https://www.jauce.com/auction/d360381157
I wonder if this was a kit set project
https://www.jauce.com/auction/d360381157
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Wow that does look cool! I can not fibd any results for Seperation Enhancer for DA-Q100.
What do you think MQ-4 is about?
Seems to be a Diatone (never heard of them myself but apparently a Mitsubishi brand) DA-Q100 "4 Ch Decoder - Separation Enhancer". Given the crude Dymo labels, the two model numbers (Q-2000 & DA_Q100), the lack of a manufactures name and absence the of a serial no. / mains voltage rating plate the one offered for sale in BBQ's link looks very much like a prototype. The production ones looked like this:
View attachment 39924
View attachment 39926
That strange function gets variously labelled QM-4 or MQ-4, one of those many obscure Japanese formats limited to some small record companies there.
More info here, including some amusing stuff about their logic circuit:
https://audio-database.com/MITSUBISHI-DIATONE/etc/da-q100-e.html
They appear to abound on Japanese auction sites but not sure they ever made it to a worldwide market back in the day. There was also this variant (the DA-Q200) which had a rear power amp in from the looks of it:
View attachment 39925
First thing that came to mind is that it would be way cool to adapt a Surround Master V2 to this enclosure.
Great minds think alikeHAHA we think alike! When the SMv2 gets here I will certainly use it as is. But I really want more than 1 input, a L/R balance control and a phase or panorama control. That could be an external box. But I would also like to have a 5.1 discrete input and another set of buffered outputs to my Panny quadscope. That would require pulling the SM v2 board out & reinstalling in another enclosure. That Diatone has just the right amount of knobs & switched for that.
Black panel faces are much easier to re-purpose than brushed aluminum. One of my more successful projects was gutting a Sansui QS-500 & reusing it as quad multi-source input control center. Doing the same thing with the earlier (but very very classy looking) QS-1 would have been impossible.
Great minds think alike
I'm sure there would be plenty of space inside to put/build/assemble whatever you want in the enclosure, say, a phono preamp and a proper preamp to begin with.
In other words sold for parts only. If re-purposing that doesn't matter so much. The meters light up! But UGH! Look at the dirty dirty RCA jacks!. Hard to replace since they are held in by rivets.CAUTION! The word "JUNK" included in this page refers to an item with unknown working condition or unknown origin and other details.
Exactly my thought! (Edit: I see I'm not the only one!)First thing that came to mind is that it would be way cool to adapt a Surround Master V2 to this enclosure.
I'm sure you world love doing that!Hard to replace since they are held in by rivets.
The Japanese like to use the word junk to absolve themselves of any possible claims. I tend to read that then look carefully to decide if I will bid or not. I prefer the Buyee service over Jauce or Goody Japan. If one uses Chrome they can translate the original Yahoo auction pages.
I sympathise with your caution - the uncertainties and complexities of that process have always put me off attempting to get anything from them.Ultimately I'll let this one pass buy as Jauce rules & regs seem pretty restrictive. First you open a Jauce acct & transfer $X from your verified PayPal acct to your Jauce acct. If you win good you get it but also stuck with numerous surcharges & fees that would surly exceed the bid on this decoder. If you lose the bid you don't get your money back it stays in your Jauce acct for the next time. So either was, win or not, your $$'s are gone.
Yes that would be interesting, hope you can find it. I wonder if it has anything to do with the supposed improved separation of this thing? The page linked to by https://audio-database.com/MITSUBISHI-DIATONE/etc/da-q100-e.html which rather boldly claims "has realized about the same separation rate as discrete", although the quoted specification gives a rather more modest -Buried somewhere in a closet I have a patent assigned to Mitsubishi for a high seperation quad decoder. I remember it being very complex & interesting design. I might have to dig it out. Yes, I consider studying patents to be fun reading.
Separation rate | Between each channel: A maximum of 15dB |
I sympathise with your caution - the uncertainties and complexities of that process have always put me off attempting to get anything from them.
Yes that would be interesting, hope you can find it. I wonder if it has anything to do with the supposed improved separation of this thing? The page linked to by https://audio-database.com/MITSUBISHI-DIATONE/etc/da-q100-e.html which rather boldly claims "has realized about the same separation rate as discrete", although the quoted specification gives a rather more modest -
Separation rate Between each channel: A maximum of 15dB
Well that explains everything.1.fourth in order or rank; belonging to the fourth order.
I didn't think that on line patents would go that far back but it is: Mitsubishi Quatenary Decoder
What the heck is quaternary?
Well that explains everything.
It's this approach that inspired me several years ago to do QS decoding on the PC differently than all the other approaches on the QQ forum. As briefly as possible I make two copies of the stereo original. In AA3 I use channel mixer to create the following:
Left = left + .414 Right
Right = right + (-.414 left)
You now have respectively left front & right back together. I save as Lf_Rb. With the next copy you do the opposite to produce right front & left back. With AA3 Center Channel Extractor you apply to each pair & it cancels all the crosstalk on a diagnol basis. It is proportional;set the cancellation to 10dB or 25dByou get 10dB or 25dB crosstalk reduction. This as well as any pre-synthisis enhancement can be done with scripts. The down side is you must now open up a couple of instances of AA 3 & copy paste these files into the correct left front/right front pairs & same for the rears. Time consuming but great results.
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