SHO dual output wiring (noob questions inside)

[poppyman]

So, I've got this "kit" version of a SHO but it comes only with a single output.

I never really bothered about the second output before but  I went to a gig last night and a guy was feeding 2 amps with a SHO and it sounded great and looked very practical.

It saves a bit of pedalboard real-estate (no more ABY box needed?).


So here are my noob questions:

Does this wiring diagram (below) would work? (seems almost too simple to be working)
Would I lose any output volume  if I plug just one output?
Is the volume splitted equally between the 2 outputs?
Would this wiring work with  other super gainy effects (BSIAB, Red Llama...)?



Thanks in advance

[PRR]

It gives two identical outputs. Loss may be insignificant.

You could instead just use a Y-cord.

Is that what you want? On "some" effects it is possible to tap two *different* sounds. Or in a phase-shifter, two points that sound the same individually but mix in a complicated way. But yes, sometimes the same sound through two amps in two places is much richer than one.

[armdnrdy]

Here's the schematic. It "SHO" looks easy to add the other output.

http://analogguru.an.ohost.de/193/schematics/Zvex_SHO.gif

[poppyman]

Thanks for the link!!! 

I have to give it a go.

For the volume, my noob brain tells me that if I plug one output I get 100% of the signal coming from the SHO, if I plug the 2 output,s then the volume is splitted equally between the 2 outputs/amps. That would be the best situation. For whatever reason, if it's not the case, the difference could be fine tuned with the amps setting...

[armdnrdy]

You got it!

[Jazznoise]

There should be no volume drop, the output impedance should simply halve. In our V=I.R equation, we can consider this an example where V is fairly fixed and plugging it into something simply varies the I and the R, making the transistor run hotter or cooler as it increases its current output. The variation in this example is tiny, maybe the difference of 2-3mA to 6mA, so don't be alarmed by that.

Think of a 4x12 cab. 1 speaker plugged in by itself doesn't sound 4 times louder than any one of the others wired up in parallel. The difference largely comes from how much power you're drawing from the power amp.

[PRR]

> brain tells me that if I plug one output I get 100% of the signal coming from the SHO, if I plug the 2 output,s then the volume is splitted equally between the 2 outputs/amps.

It is almost the same as your home lights. You have 120V (or 230V) at the wall. You plug in one, two, ten lamps. You still have very-nearly 120V at the wall. Every lamp runs "full" brightness.

That's ideal. There are always losses. House power wiring is normally designed for less than 2% loss at MAXimum load. 120V can sag to 117V. 117V is close-enough to 120V for practical purpose.

The "loss" in that pedal is equivalent to a 5K resistor. A typical guitar-amp input is 500K, 100 times higher. Signal sag is about 1%. You can't hear 1% difference. With two 500K amps connected, sag is another 1%. You won't hear that either. You need near 10% sag to hear a for-sure drop in level. You can connect ten typical 500K g-amp inputs for a "slight" drop in level, easily corrected by tapping the volume a half-twitch. (Actually if all ten amps are singing in the same room, it should be ten times louder, or 9X louder counting 10% sag.)