D-1103
The digital signal delay device shall be capable of delaying an audio input signal to each of three
independently adjustable outputs. The minimum output time setting shall be 100 microseconds,
including propagation delay, and the time delay at each output shall be adjustable in 10-
microsecond steps up to maximum delay of 655 milliseconds. The unit shall use 16-bit A-to-D
conversion with a 100k Hz sampling rate, and shall have a maximum output-to-noise ratio floor of
greater than 90 dB. The input circuitry shall be electronically balanced and shall accept either
balanced or unbalanced sources. The balanced input impedance shall be 10k ohms. Each output
circuit shall be electronically balanced and capable of driving a load of 600 ohms or greater. The
unit shall accept optional input and output transformers which shall be internally installed via
standoffs and plug-in connectors. A 7-segment LED input headroom display shall indicate 3 dB
below maximum output for the combination of input and input level control settings. Frequency
response shall be flat (±1 dB) from 20 to 20k Hz. The digital delay device shall include a digital
display that can be set to indicate the time delay of Outputs 1/2/3. A front panel Fine control shall
allow the user to set the output delay for output 1/2/3 in summed high resolution (10-microsecond
step) or low resolution (1-millisecond step) modes. A Lock mode shall be provided which disables
all front panel pushbuttons except the memory selection and Fine keys. A back panel Protect
switch shall disable all front panel pushbuttons, leaving only input and output level controls
functional. A security cover shall be provided to protect the front panel controls from being
tampered with. The delay unit shall provide four preset memories for storage of delay-time
settings. The preset memories shall be accessible via front panel pushbuttons or remotely by
means of contact closures through a rear panel terminal strip. Up to 15 delay units shall be
configurable, with a single master unit to initiate preset selection for all slave units. The unit shall
contain a relay circuit which bypasses all internal electronics in the event of power failure. lnput
and output connections shall be made via rear panel terminal strip connectors. Dimensions (W x
H x D) shall be 19.0" x 1.7" x 14.0" (483 x 44 x 357 mm) with rack-mount brackets attached and
shall occupy one standard rack space.

The digital signal delay shall be TOA model D-1103.