yes you are right the specs that i fund its from Bn&H and not from the meanifacter but what about the audient id4 MKii i found this in their website
MAXIMUM LEVEL @ 30R:2.59V Peak, 1.827V RMS, 223mW
MAXIMUM LEVEL @ 62R:4.18V Peak, 2.95V RMS, 280mW
MAXIMUM LEVEL @ 600R:7.72V Peak, 5.46V RMS...