7 Manual

Appendix A - Adjustment of tonal balance

If you feel that the tonal balance in the upper midrange and lower treble frequencies of the LS-77 is not correct

for you, you may wish to change the resistor combination fitted under the cover labelled “High Frequency Level

Adjustment”. Some of the required adjustment may be due to the differences in listening distance while others

may be a result of differences in taste and furnishings.

Remove this cover after removing the machine

screws that hold the cover in place using the 2mm

metric hex key (Allen Key) which is provided

with your speakers (or equivalent replacement if

lost). Under the cover you will in stock condition

find two resistors one marked 15Ù and one

marked 47R. You will also find a pair of optional

resistors included per speaker, one marked 100

and the other marked 220.

Respectively the resistor marked 100 will be

referred to below as 10R, the 15Ù as 15R and

the one marked 220 as 22R. Using different

combinations allows an adjustment of the upper

midrange and lower treble frequencies by +/-3dB

in steps of around 1.5dB.

15Ω

47Ω

Designed and Engineered in Great Britain

LS 77 Professional Monitor

Sensitivity:

Frequency Response:

Peak Prog Handing:.

Cont Power Handing. :

Impedance:

87dB

8Ohms

150W

600W

27Hz-40kHz

IN OUT

100 1000 10000

Frequency Hz()

100

Output dB()

Level Adjustment

High Frequency