How to get balanced inputs working

Yes the audio horizon dac was working in balanced no problem ,can't get the mbl 5011 to work , in xlr , when dac switch on xlr with mbl hooked to balance no sound , as soon as I switch ,from xlr to RCA while still hooked to balance inputs ,music plays , I therefore assume mbl not true balanced input, or it has to be activated by mbl dac

that bogus xlr input is probably in need of service. for the price you've paid for that unit it should be working.

You might try to "reset" the 5011 back to factory settings.

8.1 Resetting to factory settings

Follow the steps below to reset your preamp to the factory settings:

1. Switch the preamp off.

2. Press and keep pressed the fourth button on the right side of the display.

3. Holding the button pressed, switch the preamp on. The display will remain dark.

4. Release the button.

5. Switch the preamp off.

6. Wait five seconds.

7. Switch the preamp on.

Factory settings: Out1 and out2 on, CD1, maximal display brightness

What is the model number of the Audio Horizons DAC?

And am I correct in understanding that the switch you have been referring to as the "switch on DAC" and as the "DAC switch" is located on the DAC, not on the preamp? Or are you referring to a switch on the preamp, which acts on the input of the preamp that is connected to the DAC?

Regards,
-- Al

Tried the resetting The 5011 as per mofs instructions (thanks mof ) still no audio, front of audio horizon dac setting is xlr ,balanced lit on front display on the mbl no audio ,switch dac knob to RCA now have audio