The flat DF target fails listening tests mainly due to insufficient bass

Evidence

These target curves have all produced high preference ratings in controlled listening tests reported in the previous sections and fall within the preference bounds. The exception here is the DF target (dashed line at 0 dB). It does not receive high preference ratings in listening tests and below 100 Hz falls outside the bounds indicating insufficient bass. Above 100 Hz it sits just on the edge of the upper bounds. The DF target with a −1 dB/octave downward tilt lies in the middle of the bounds and is a good match to the PIR of a well-designed loudspeaker like the Revel F208. — Toole, Floyd E, Sound reproduction- the acoustics and…, 1854

Categorization

• XREF: Connects to the book’s earlier chapters on the PIR and loudspeaker target responses; the Revel F208 reference frames headphone against speaker voicing. — connects to: Bass level errors cause perceived treble excess and vice versa — Toole, Floyd E, Sound reproduction- the acoustics and…, 1557; Diffuse-field targets are least preferred, but adding bass improves them — Toole, Floyd E, Sound reproduction- the acoustics and…, 1819; Pure diffuse-field calibration yields inadequate bass and low preference ratings
• yield-rescued: below the book’s yield-target cutoff, included anyway for connecting to: Bass level errors cause perceived treble excess and vice versa — Toole, Floyd E, Sound reproduction- the acoustics and…, 1557; Diffuse-field targets are least preferred, but adding bass improves them — Toole, Floyd E, Sound reproduction- the acoustics and…, 1819; Pure diffuse-field calibration yields inadequate bass and low preference ratings

Broader Connections

• Pure diffuse-field calibration yields inadequate bass and low preference ratings #corroborates (0.95)