Maybe they mean, normal for the 975? I never used headphones when I had the 975 in my system. Same for the 976 now. I never thought to use it with headphones as it sits in my main listening area, and way in the corner away from any seating.
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Main HT <> 976 <> 7200 <> Ultra-X12 <> sapphire ST2 mkII RF/LF <> sapphire SC center
sapphire ST2 mkII SBR/SBL <> sapphire SS SR/SL <> Verizon/DVR <> Vizio M70Q7 <> Oppo UDP-203 <> Amazon 4k Fire TV