Abbingdon Music Research Reference Class Proffessional Monitor LS-77 - Manual (Page 27)

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Listening Distance around 5m (farfield listening or monitoring)
HF Level R1 R2 Placement
+3 dB 15 R 22 R not recommended
+1.5dB 15 R 47 R Placement of speaker on a bookshelf or very close to walls (factory fit.)
0 dB 15 R not fitted Placement within around 1m of rear wall
- 1.5dB not Fitted 22 R Placement of speaker 2m or more from rear wall
If you feel that the tonal balance in the low frequencies of the LS-77 is not correct for you or your room, you may
need to change the positioning of the LS-77. Some of the required adjustment may be due to the differences in
placement or the room’s low frequency behaviour, while others may be a result of differences in taste and
furnishings.
If the low frequencies are percieved as too prominent you may wish to fit the large cell foam inserts to either
reduce the output of the port or you can completely seal the port using the insert made from dense foam.
Typically, the closer you place your speaker to the wall, the more the port output needs to be attenuated.