Pre-amp XLR balanced out to MI amp effects return in - TS or TRS cable?

There's not enough level out of the unbalanced preamp out jacks?

The balanced out is usually lower if it's intended to be used as a DI as well.

If the balanced out is transformer driven, it must be a 1/4" TS connector with pin 3 tied to pin 2.

If actively driven then to generally doesn't matter.

 

@agedhorse ,
Manual indicates a switchable XLR level of -20 dB or 0 dB. Schematic indicates actively driven XLR output.

https://www.google.com/url?sa=t&source=web&rct=j&url=https://ampeg.com/support/files/Schematics/S%20Series/SVT-IIP%20Pre-Amp/SVT-IIP%20Schematics.pdf&ved=2ahUKEwj5scjAmpjqAhXVFjQIHYmUDrUQFjABegQIAhAB&usg=AOvVaw1mwMfJWqNAkOYn7o0KKO0Y&cshid=1592924671048

- John

 

The 1/4" outs appear to be about -10dB so using the XLR out in the 0dB position with either a TRS or TS connector should work fine.

Pin 3 should be connected to ring on a TRS, and pin 3 should be left open on a TS for best results, though shorting pin 3 to sleeve will still work ok.

Avoid connecting pin 2 to ring or sleeve and using pin 3 hot on this design, that will affect performance.