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7. Your PS301 is capable of distributing Program Audio to any combination of the 3 circuits. It can control
the level being sent to each, independently, and monitor the level of each visually. The LED display for each
circuit can be set to be a true VU meter, but most users prefer it to be a relative reading, with the levels set
by agreement with the listeners on each circuit.
8. The program input on the rear panel can be either mic level or line level, chosen by the assigned DIP
switch. In either case it is unbalanced, so your source must be made unbalanced at some point. The most
common program audio is a feed from the front of house console. This allows the entire technical crew to
follow the 'run of the show', no matter where they are located and to anticipate cues, synchronize videos,
effects, etc.
9. To operate properly, Pro Intercom audio circuits must all terminate in 200W. This makes it possible to add
and remove stations without a change in the overall level of the system, and extends the distance over which
you can send a noiseless signal. Each of the 3 circuits in the PS301 has it's own 200W termination point
so that it can be used independently of the other 2 circuits. When you use the front panel "Link" switch to
combine A+B or A+B+C, the PS301 automatically adjusts the termination impedance so that the total always
remains 200W.
10. There may be circumstances where you want to use one or all of the PS301 circuits to boost the power of
a system which already has a termination circuit, such as an underpowered Master Station. For this reason
you can "lift" the termination of each of the PS301's circuits using a rear panel DIP switch marked for this
purpose.
11. Your PS301 should live comfortably with other audio and lighting gear in the same rack. The power
supply is "linear" or "analog", with a toroidal transformer, a huge rectifier and a separate regulator for
each circuit. Strayfield radiation is minimal as compared to a switch-mode power supply. Temperature is
monitored and well regulated. The components likely to generate heat are mounted on a massive heat sink.
In the event of an unusual rise in temperature, a side-mounted cooling fan will come on automatically.
The PS300
The PS300 is essentially identical to the PS301 except that it does not have a program input or program
distribution capabilities. All of the above paragraphs except 7 and 8 apply equally to the PS300.
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