Abbingdon Music Research LS-77 Reference Class - Manual (Page 17)

17
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
(Default)
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
A.2 Low Frequencies Adjustment
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 differ-
ences 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.