Operating instructions

Front Panel
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(8) High Boost/Cut - Selects the amount of cut or boost applied by the high shelving filter. The
positive and negative numbers on the front panel denote dB values (-9, -6, -4.5, -3, -1.5, 0, +1.5, +3,
+4.5, +6, +9).
(9) High Frequency – In conjunction with the High Boost/Cut switch ( see #8 above), selects the
corner frequency for the high shelving filter. Available frequencies are 4.5K (kHz), 7K (kHz), and 10K
(kHz).
(10) Low Boost/Cut - Selects the amount of cut or boost applied by the low shelving filter. The
positive and negative numbers on the front panel denote dB values (-9, -6, -4.5, -3, -1.5, 0, +1.5,
+3, +4.5, +6, +9).
(11) Low Frequency - In conjunction with the Low Boost/Cut switch ( see #10 above), selects the
corner frequency for the low shelving filter. Available frequencies are 70 Hz, 100 Hz, and 200 Hz.
(12) Peak Reduction - Determines the amount of gain reduction provided by the T4 Optical
compressor. This control essentially combines the Threshold, Ratio, and Input controls found on
other compressors. Higher settings will increase the relative amount of compression, while lower
settings reduce the amount of compression (a setting of 0, with the knob at its fully counterclockwise
position, results in no compression). Note, however, that all compression performed by the LA-610 is
program-dependent—that is, the degree of gain reduction changes as the signal varies.
( see pages 18 - 22 for more information)
(13) Gain - Once the desired amount of compression or limiting is set by adjusting the Peak
Reduction knob, the Gain knob can be used to make up for any signal attenuation (up to 20 dB of gain
can be added). Set the Meter Function switch to the COMP position in order to have the meter display
the final output level from the LA-610 when adjusting the compressor Gain knob. ( see #14 below)
(14) Meter Function - This switch determines what the LA-610’s VU meter displays: either the
PREAMP output (that is, the level of the signal which feeds the compressor section), the amount of
compressor gain reduction (GR), or the LA-610’s final output level, after compression (COMP). When
COMP is selected, a meter reading of 0 corresponds to a level of +4 dBm at the rear panel line output
jack.
 A compressor Gain setting of approximately 6 is unity gain (no signal boost or attenuation).
 When the T4 compressor is bypassed, “GR” and “COMP” settings will not show activity.