Multiple in to multiple out

Karl5150 · 1016

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Offline Karl5150

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on: November 21, 2019, 07:39:46 AM
I am currently using my S.E.X. 3 amp in the second system to allow headphone listening. I have always thought the Seductor was a better match with the MarkAudio/FH3 speakers in that system, the drawbacks being: 1) No headphone jack and 2) hair-trigger volume with the Quickie (never set higher than 9 o'clock).
What if I made a switching setup that allowed for not only multiple inputs (CD/TT/Server) but switched output to the either the S.E.X. 3 or the Seductor (with a simple SMII style volume/balance control replacing the Quickie)?
The attached wiring scheme is exactly that.
Folly? Wiring mistakes?
T.I.A.,
 Karl

Karl
Downstairs: Planar3>PH-16>Stereomour II>OB Betsy+
Upstairs: RP1>Eros/CD5004>Seductor (2x Monoblocks)>FH3
Office: Modi Uber 2/Sirius>SEX2.1.1>µFonken FF85WK + DC160 subs
BR: FiiO M6>SEX3.0.1>ScanSpeak 10F + TangBand W6 (Mono)/DT770Pro
Garage: X12 streamer>Quicksand>Minimus 77


Offline Paul Birkeland

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Reply #1 on: November 21, 2019, 10:20:00 AM
The SMR-II style level control doesn't lend itself well to driving a lot of cabling, especially if there's also Miller capacitance sitting at the other end of the cables.  The Seductor won't have this issue, but the SEX will a little bit.  If your sources will support it, you could go with the 10K version of those controls with 3.3K resistors instead. 

Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man


Offline Karl5150

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Reply #2 on: November 22, 2019, 06:03:00 AM
Thanks for weighing in Paul.
Everything sits close together, so cables are 0.5 or less.
The S.E.X. will be driven from Amp 1 in the drawing, so only the 2 source switches between inputs and the outs to that amp. (It has my "QuietSex" attenuator, based on the MourQuiet, adjusted to approx. 100K)
The Bal/Vol pots will only be active in-line to AMP 2, the Seductor. Would it be prudent to put a couple of resistors in line to try and bring it up to 100K?
Thanks again,
Karl

Karl
Downstairs: Planar3>PH-16>Stereomour II>OB Betsy+
Upstairs: RP1>Eros/CD5004>Seductor (2x Monoblocks)>FH3
Office: Modi Uber 2/Sirius>SEX2.1.1>µFonken FF85WK + DC160 subs
BR: FiiO M6>SEX3.0.1>ScanSpeak 10F + TangBand W6 (Mono)/DT770Pro
Garage: X12 streamer>Quicksand>Minimus 77


Offline Paul Birkeland

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Reply #3 on: November 22, 2019, 06:12:15 AM
It's not so much about bringing the load impedance up as it is limiting the impedance that gets added as output impedance.  Perhaps splitting the difference with 50K pots and 15K resistors would be worth a shot.

Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man


Offline Karl5150

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Reply #4 on: November 23, 2019, 03:15:40 AM
Thanks for the explanation Paul. I ordered the 50k pots and will give them a try. I have the 100k set so I might even get adventurous and try both to see if I can perceive a difference.
Karl 

Karl
Downstairs: Planar3>PH-16>Stereomour II>OB Betsy+
Upstairs: RP1>Eros/CD5004>Seductor (2x Monoblocks)>FH3
Office: Modi Uber 2/Sirius>SEX2.1.1>µFonken FF85WK + DC160 subs
BR: FiiO M6>SEX3.0.1>ScanSpeak 10F + TangBand W6 (Mono)/DT770Pro
Garage: X12 streamer>Quicksand>Minimus 77