Terms Glossary

Audio Unity Gain

This unity gain configuration reproduces the input signal and actively drives all of the output signals using a single driver. This configuration acts as an active "splitter", and the unit operates using a 600 Ohm load.

Audio Unity Gain with Individual Drivers
This unity gain configuration uses individual drivers for every output signal. The units operate using a 600 Ohm load for unbalanced audio, and a 300 Ohm load for balanced audio (per line).

Audio Variable Global Gain
This gain configuration reproduces the input signal and actively drives all of the output signals using a single driver with adjustable gain. The unit gain range is specified by a 600 Ohm load for unbalanced audio, and a 300 Ohm load for balanced audio (per line).

Audio Variable Individual Gain
This gain configuration reproduces the input signal and actively drives all of the output signals using a separate drivers with adjustable gain for each channel. The unit gain range is specified by a 600 Ohm load for unbalanced audio, and a 300 Ohm load for balanced audio (per line).

Balanced Audio Input
This type of audio is usually found on professional grade audio equipment. Signals are transmitted by three conductor transmission lines. The input termination for each signal conductor to ground exceeds 10K Ohms. Balanced audio may be stereo of mono signals.

Brick
VAC refers to their products as bricks because when the production process is complete they resemble that shape quite well. Plus, they are very hard and durable, as you would expect rock bricks to be.

Differential Video Input
Differential input is used when the user requires the input ground or shield to be isolated from the output ground or shield. This input is used to provide limited ground isolation (<5K Ohms) and helps break ground loops through the cable shield conductors. Unlike the standard and loop-thru inputs that look at the input signal with respect to ground, this input looks at the signal difference between the input signal and the input ground shield.

Loop-Thru Balanced Audio Input
The loop-thru option operates with the same signal type and characteristics as the standard balanced audio input, but with a low impedance pass through path at the input to facilitate daisy-chaining of multiple units. This input configuration is also useful when a passive output is required in the event of power failure.

Loop-Thru Unbalanced Audio Input
This loop-thru option operates with the same signal type and characteristics as the standard unbalanced audio input, but with a low impedance pass through path at the input to facilitate daisy-chaining of multiple units. This input configuration is also useful when a passive output is required in the event of power failure.

Loop-Thru Video Input
This input allows the signal to be routed through the video distribution amplifier and out to another device. The loop-thru output must be terminated by a connected device or with a 75 Ohm terminator. The advantage of the loop-thru configuration is the signal will pass through the video distribution amplifier to the loop-thru output even if the video distribution amplifier has no power. These Bricks ship with a 75 Ohm terminator, and additional terminators are available for purchase.

Standard 75 Ohm Video Input
Our most common video input, this input is used for short cable rue and local signal distribution. Input impedance is 75 Ohms to common ground.

Unbalanced Audio Input
Our most common audio input for non-professional applications, this type of audio is also often found on commercial grade audio equipment. Signals are transmitted by two conductor transmission lines. The input termination exceeds 10K Ohms. Unbalanced audio may be stereo of mono signals.

Video Unity Gain
This unity gain configuration sets the signal level at the distribution amplifier outputs (into a 75 Ohm load) so they equal the input signal level. A unity gain distribution amplifier acts as an active "splitter" in which each output is an identical copy of the input signal. VAC video distribution amplifier designs utilize a separate driver for each output. This configuration provides the maximum isolation between outputs.

Video Variable Global Gain
This distribution amplifier configuration provides a single gain control for each group of two or four outputs (one control per Brick "layer"). The normal gain range is 75% to 175% of the input signal. A single output driver connects to the four outputs.

Video Variable Individual Gain
This gain configuration reproduces the input and actively drives all of the outputs using individual drivers. The gain level of each output is individually controlled, with a range of 75% to 175% of the input signal. The individual gain configuration provides the user with the most flexibility to adjust and optimize output signal levels.