RIAA Equalized noise measurements.
1 kHz gain = 68 dB.
DL-103 Rterm is 100Ω.
"5 cm/sec lateral" reference level (actually 3.54 cm/s RMS left or right-only) is +2.0 dBu.
(Checked with an STR-100; DL-103 channel balance was about 0.5 dB.)
There is a 0.7 dB approx insertion loss for the FFT A/D.
The induced magnetic hum field can be physically nulled on both channels to better than -70 dBu.
S/N ratio relative to 5 cm/s is approximately 72 dB unweighted and 78 dB A-weighted.
As can be seen most of the remaining noise is hum contamination which could be improved by a better enclosure.
Some may also be normal mode differential hum from the cart itself.
Relative to disc surface noise its incredibly quiet.
ZTX851 Moving Coil Balanced Phono Preamp Noise Measurements With Denon DL-103 On Armrest.
ZTX851 Moving Coil Balanced Phono Preamp Noise Measurements With Denon DL-103 On Armrest, A-Weighted.