Heritage Audio HA609A User manual

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HA-609A QUICK START GUIDE

This is a quick start guide on using the HA-609A dual compressor/limiter unit.
For more info on it or more tips on how to use the unit, please check

www.heritageaudio.net often, and make sure to follow Heritage Audio on

Facebook, Instagram and You Tube.

Dec 2nd, 2019

Rev. 1.0.

INSTALLING THE HA-609A

Thanks for purchasing the HA-609A stereo dual mono compressor/limiter.
Please make sure the following items are in the box when you open it.

• This manual.

• HA-609A main unit.

• 48v Power Supply.

• IEC Cable.

Depending on your system requirements, you will need four XLR cables to
hook up your system. Please check your input sources and output
destinations and purchase the correct cables.

The power supply is of the auto switching type so it works worldwide without
adjusting anything. In case your country uses a different mains cable other
than the one provided in the box, just get the correct one and you are done.

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Basic audio connections are just balanced left and right input and output
connections by means of XLR connectors. Should you require to connect the
unit to unbalanced equipment, please do so by connecting pin 3 to ground.

The HA-609A is able to accept input levels in excess of those that any
interface can provide, so the chance that its input is overloaded is rare.

However, it is able to provide output levels in excess of those that most
interfaces can accept, so please keep this in mind.

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.

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