Should I adjust my NAD M51 DAC volume north of 0 dB with this setup?

In the warmer months, I am running a Schitt Freya tube preamp with an NAD M22 power amp and an NAD M51 DAC. [This replaces a tube integrated in the chain with the NAD M51 from my winter system.]

My question for the technical gurus is by looking at my Schitt preamp specifications and the NAD M51 specifications, can you make a recommendation as to where I should set the volume output level on the M51? Here are the specs:

Preamp/Schitt Freya:
Tube GainGain: 5 (14dB)Frequency Response: 20Hz-20Khz, -0.2db, 3Hz-200KHz, -3dB THD: <0.01%, 20Hz-20KHz, at 2V RMS IMD: <0.01%, CCIR SNR: >95db, A-weighted, referenced to 1V RMS Output Impedance: 210 ohms Topology: differential input/output, pure triode, with low impedance followers Input Impedance: 10K ohms
Crosstalk: >75dB, 20-20kHzInputs: 2 XLR pairs plus 3 RCA pairs, selectable via front switch or remoteOutputs: 1 XLR pair plus 2 RCA pairs, selectable via front switch or remote Volume Control: relay-switched stepped attenuator with discrete thin-film resistors, 128 0.625dB steps

DAC/NAD M51:

• Rated Distortion (THD+N with AES 17 filter)
• <0.0005% (0dBFS)
  <0.002% (ref. 1kHz-60dBFS)
• IMD Distortion
• 0.0001%
• Signal/Noise Ratio
• <-123dB (ref. 0dBFS 2V out)
• Channel Separation
• >-115dB (ref. 0dBFS Volume -1dB)
• Sample Rate
• 32kHz to 192kHz (USB and digital S/PDIF)
• Frequency Response
• ±0.5dB (ref. 20Hz-96kHz @ 192kHz sample rate)
• Output Level
• 2V (ref. input 0dBFS)

• Balanced 110 Ohms

Specs are available here: http://www.schiit.com/products/freya https://nadelectronics.com/product/m51-direct-digital-dac/