[sdiy] Help with Jupiter 8 clone

[Tom Wiltshire]

We're here to learn, Josh, not "wallow in a fantasy world".

If you've got work that backs up your claims, or published papers you can reference, we'd love to see.

Thanks,
Tom


> On 4 Aug 2022, at 01:00, Josh Nursing via Synth-diy <synth-diy at synth-diy.org> wrote:
> 
> 
> 
> On Wed, Aug 3, 2022 at 1:23 PM Ben Stuyts <ben at stuyts.nl <mailto:ben at stuyts.nl>> wrote:
> The problem I see each and every time though, is that any noise generated in whatever is on the DC side, goes right back through the PSU and onto the mains supply lines.
> 
> Exactly. And that messes up all the audio chain response.
>  
> I have a sneaking suspicion the handful of people looking for citations or sources have never even measured a thing themselves - high chance they wouldn't even know how to measure nor what to look for -  nor do they know anything about the inner workings of either SMPSes or the Linear Regulated PSUs, and furthermore, know absolutely nothing about how power distribution also plays a part in this, together with leakage currents. 
> 
> I've done the work, compared Linear vs SMPSes with a DAC, both auditioning and measuring. In fact, I can design an even better Linear PSU than the originals in the vintage machines or even modern machines as I've spent years investigating precisely this.
> 
> Some of it has been published, they could look it up with the measurements there, but that would require I care about convincing these people. Let them wallow in their fantasy world.
> 
> While Xpander/Matrix 12 are better at Synthesis architecture, it is the OB-X, Xa and 8 which found favour with a lot of pros even with a more limited architecture. Guess why that is despite the lesser architecture. I bet they won't be able to find a reason now. Oberheim himself made a new synth: it is a combination of the classics (X, Xa, 8) which had the Linear PSUs and the more simple architectures. Let them try explaining that now...
> 
> Yes, a lot of machines use SMPSes. They really are a disservice to audio quality, they will mess up your audio chain, as sure as a ballast-lamp or a dimmer will do if it is anywhere in the same power distribution, as sure as your computer's SMPS will also damage Sound Quality if it's in the chain. If you can't do otherwise, at least use an AC-side filter (here again, I designed and built my own), but try to ensure ports like USB are isolated too.
> 
> Then people who know very little blame the filters... As if Curtis filters were known to be bad in the past. Guess what happened between then and more recently with these synths using those Curtis chips, albeit newer.
> 
> Where's the bass?
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