My amp works great but I only wound up connecting the XLR balanced inputs. I now want to connect the RCA (single ended) with toggle between so I can try it with an unbalanced preamp. In looking at the schematic on 6 moons, why does it show two switches/toggles in the -VE pathway? Or am I not reading it correctly?
the impedances on the two signal poles must remain identical for the balanced impedance connection to remain fully effective.
If you add a switch to one pole to bring in an unbalanced connector, then that may add just a tiny bit more capacitance. This would unbalance the HF impedance when switched out. Switching both poles may just balance the added capacitance.
If you add a switch to one pole to bring in an unbalanced connector, then that may add just a tiny bit more capacitance. This would unbalance the HF impedance when switched out. Switching both poles may just balance the added capacitance.
Hypex UcD-series unbalanced/balanced wiring diagram can be found here -
https://www.hypex.nl/img/upload/doc/an_wp/AN_Amplifier_signal_wiring.pdf
The answer is to wire RCA active to XLR pin 2, RCA shield to pin 1, then RCA shield via a switch to XLR pin 3 ...
but pay attention to earthing, especially the Hypex note:
Alternatively you could leave your amplifier chassis with XLR inputs only, then make up suitable RCA-to-XLR cables.
https://www.hypex.nl/img/upload/doc/an_wp/AN_Amplifier_signal_wiring.pdf
The answer is to wire RCA active to XLR pin 2, RCA shield to pin 1, then RCA shield via a switch to XLR pin 3 ...
but pay attention to earthing, especially the Hypex note:
Alternatively you could leave your amplifier chassis with XLR inputs only, then make up suitable RCA-to-XLR cables.
I can confirm this one as a flawless working solution. I own a Hypex ucd700 amp which I drive with a B1 with Korg Nutube and I connect them with a rca to xlr cable without any problem.
