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44 PDX3000 Quick Start Guide 45

7. Installation

7.1 Rack mounting

Your PDX ampli er  ts into a 19” rack and requires two rack units. Install into the rack using

four attaching screws and washers for the front panel. Consider reinforcing the back panel

using rack accessories (supplied with rack), especially if you will be taking

the PDX on the road.

Make sure enough cool air reaches the rack, especially when other rack equipment emanates

a lot of heat. The PDX ampli ers circulate heat from the front to the rear vents to relieve heat

inside the rack enclosure.

If you are installing multiple power ampli ers into a 19" rack, add  lled panels in the empty

rack spaces to avoid circulation of hot air.

Fan speed adjusts automatically to assure safe operation. Never block ventilation openings.

Should internal temperature reach extreme values, the unit will shut down automatically, and

resume operation when cooled down.

7.2 Connections

Audio inputs

Each channel input uses either XLR or ¼ ” jacks. The XLR jacks can accept balanced XLR connections, while the ¼” jacks can accept both balanced ¼” TRS connectors

and unbalanced ¼” TS connectors. To deploy XLR connectors for unbalanced signals, bridge pins 1 and 3; mono ¼” TS connectors do not require any alteration to carry

unbalanced signals.

When working with balanced signals, please make sure to exclusively use balanced cables. One unbalanced cable in the signal chain can change a balanced signal into

an unbalanced signal.

Outputs

Your PDX ampli er requires speakON twist-locking professional speaker connectors. These professional speaker connectors were developed specially for driving

high-powered speakers. The connectors snap in securely, prevent electric shock, and ensure correct polarity.

The CHANNEL A output contains output pins for both CHANNEL A (1+/1-) and CHANNEL B (2+/2-), so that both channels, if desired, can be sent out simultaneously on a

single 4-pole speaker cable.

The CHANNEL B output, on the other hand, has pin outs for CHANNEL B only (1+/1-).

strain relief clamp

sleeve

tip

sleeve

(ground/shield)

Unbalanced ¼" TS connector

tip

(signal)

output

For unbalanced use, pin 1 and pin 3

have to be bridged

1 = ground/shield

2 = hot (+ve)

3 = cold (-ve)

input

Balanced use with XLR connectors

◊ ◊ Whenever possible, use thick and short speaker cables to minimize power loss.

7.3 Connecting to mains

Always connect your PDX ampli er to the voltage speci ed on the rear of the device. Connecting the amp to an incorrect voltage can permanently damage your amp.