L-1102
The device shall be dual channel with each channel able to function independently as a noise
gate and as a signal leveler or limiter. Nominal output level shall be +4 dB into 600 ohms
(maximum +20 dB), electronically balanced, at less than 0.1% THD at 1k Hz. Distortion with 30
dB compression shall be less than 0.2% THD at 1k Hz. Hum and noise shall be more than 92dB
(IHF A-weighted) below 0 dB. Frequency response shall be ±1 dB (ref. 1k Hz) from 20 to 20k Hz.
Nominal input level shall be +4 dB (maximum +20 dB); input impedance 10k ohms, electronically
balanced. Gain below the gain reduction threshold shall be unity in LIMITER mode and adjustable
from 0 dB to +20 dB in LEVELER mode. The limiter sense input impedance shall be 100k ohms
with a maximum input of 160 V (limiter off). The unit shall accept optional line input and output
isolation transformers. The transformers shall mount easily and securely inside the unit with the
machine screws provided. Electrical connection to the unit shall be easily accomplished by
means of flexible wires with locking connectors. Front panel switches shall select the mode of
operation for each channel: LEVELER or LIMITER select, NOISE GATE in/out, BYPASS in/out
and LINK on/off. In LEVELER mode the threshold for leveling shall be adjustable from 0 dB to -40
dB. In this mode the output gain of the unit shall be adjustable from 0 dB to +20 dB. In LIMITER
mode the sense signal shall be from the output of an external device such as a power amplifier.
The limiting threshold shall be adjustable from 1.0 V to 100 V (+2 dB to +42 dB). The gain
reduction method for both modes shall be a 10:1 ratio with a soft knee threshold. Attack and
release times shall be signal dependent with a nominal attack time of 1 msec (±) and release time
of 500 msec (±) at 10 dB gain reduction. With the NOISE GATE in, the unit shall reduce its gain
by 20 dB when the input signal is below a threshold adjustable from -40 dB to -80 dB. In LINK
mode the VCA circuits shall be linked such that the leveling/limiting threshold for both channels is
controlled by the channel 1 threshold setting with the channel 2 threshold control being inactive.
However, the highest sense signal from either channel shall control both VCA circuits so that the
gain for both channels is always the same. In LINK mode all functions, except the limiting/leveling
threshold, shall operate independently for each channel. In BYPASS mode the channel shall be
electrically bypassed from the input/output transformers. Front panel indicators for each channel
shall include: noise gate in; noise gate threshold (input signal is below threshold); leveler or limiter
mode; bypass on; signal presence (above -30 dB input signal); gain reduction m (0 dB to -30 dB
VU scale). A link in and power on indicator shall also be provided. The rear panel shall have the
following: barrier strip type screw terminals for signal input and output and sense connections; a
jumper to separate the signal ground from the chassis and a fuse holder with a replaceable 1/4
amp fuse with 1 spare fuse provided. Power consumption shall be 14 W at 120 V AC. The unit
shall be enclosed in a durable, painted, black 1.0 mm (0.04 in.) steel enclosure mechanically
reinforced by a 2.0 mm (0.08 in.) thick, black anodized, aluminum front panel. Dimensions (W x H
x D) shall be 19” x 1.73” x 12.47” (482.6 x 44.0 x 316.8 mm). Weight shall be 8.8 lbs. (4.0kg).
Standard equipment rack-mounting and a smoked plexiglass security cover shall be included.

The leveler/limiter shall be TOA model L-1102.