Operational Overview - Universal Audio Ampex ATR-102 Manual

Operational Overview

Unique Band Interactions & Distinct Cut-Filter Combinations
The unique inductor-based EQ section of the board is what the Trident
A-Range sound is all about. A series of three high pass filters and three low
pass filters are arranged at the ends of the EQ section (see
are unique in that the switches can be pushed in simultaneously, offering dis-
tinct cut filter combinations with unusual filter curves.
The rest of the EQ section contains four bands: low shelf, low-mid bell,
high-mid bell, and high shelf (see
fixed frequencies and ±15 dB of gain. These were the good old days before
sweepable frequencies and bandwidth controls, but the results are wonder-
fully warm and musical. The controls complement is rounded out with phase,
output level, and bypass.
There is band interaction between the high and low shelving filters, and also
between the low-mid and high-mid bell filters. The midband interactions can
be significant if the center frequencies are near each other.
Each of the four main EQ bands have similar controls. The band frequency is
Band Layout
controlled by its knob, and the band gain is controlled by its slider.
low pass
filters
Figure 131. Trident A-Range band control layout
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high shelf
band
high-mid
band
Figure 131). Each band has four selectable
low-mid
band
low shelf
band
- 406 -
Figure 131). These
high pass
filters
Chapter 46: Trident A-Range EQ