UCD250 input buffer

Seems I have made a mistake in assuming I could connect my ucd250 modules directly to my Najda dsp.
The nadja has 6v outputs and approx 2kohm impedance and the ucd250 needs 6.5v, and has 1.8k impedance.
I'm assuming I need some sort of buffer stage to go between them, any suggestions for a basic buffer kit?