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GENERAL DESCRIPTION
The Heritage Audio HA-609A DUAL MONO STEREO COMPRESSOR/LIMITER is
a professional diode bridge-based dynamics processor in a convenient 2RU
format. It features Carnhill/St Ives transformer balanced inputs and outputs,
and the outputs are driven by means of ´73 type Class A amplifiers. It also
features St. Ives interstage transformers to isolate the diode bridges in a fully
floating configuration. Therefore, there is a total of no less than 6 Carnhill/St
Ives transformers per unit, 3 per channel and tone for days.
Unlike vintage diode bridge designs, the HA-609A has dual attack times both
in the compressor and limiter sections and expanded threshold and limit
level ranges that easily accommodate the hotter modern input signals. Gone
is the classic problem of the unit always compressing even at the highest limit
level and compression threshold that used to drive crazy to the mixing and
mastering engineers.
Finally, the all discrete class A construction departs from other vintage and
current diode bridge units, (which still rely on class A/B amps), and reacts so
much better to compression, in a much more musical way.
