Glensound GS1U-044 - Twin Headphone Limiter - Used

Glensound GS1U-044 - Twin Headphone Limiter - Used

The Glensound GS1U-044 is a headphone limiter that enables higher levels of audio to be used for short periods in a controlled way. 

The unit contains a compressor with a large compression ratio controlled by side chains that contain A weighting filters and special rectifiers. This effectively limits the maximum voltage level. In addition to the compressors there are also circuits designed to monitor the level to the headphones.

In its normal usage the compressors will keep the noise levels below critical. However a key type switch is provided that allows the user to increase the maximum level. Information that this switch is operated is available on the rear panel D connector, thus allowing management to log and control the correct usage of the limiters.

Different makes & types of headphones have different sensitivity levels, therefore the  GS1U-044 needs to be calibrated for individual types of headphones. To ensure that the correct output audio levels are emitted depending on the headphone type connected a calibration resistor (of a specific value for a specific type of headphones) is used mounted in a 5 pin XLR connector used as the headphones connector. 

The maximum output levels that the limiters allow the headphones to emit are +85dB(A) with the user operated key switch turned off or +90dB(A) with this keyswitch in the 'on' position. If a loop is made on the units rear panel D connector then these levels both increase by 5dB.

As an indication for the user, of the audio level to the headphones yellow & red large LEDs are provided on the front panels of the units. Open collector outputs are also provided on the rear panel D connector for external indication of this level. Without the D connectors loop made the yellow LED indicates a level of 85dB(A) and the red LED indicates a level of 90dB(A), with the loop made and the key switch in the on position then the yellow LED indicates a level of 90dB(A) and the red LED indicates a level of 95dB(A).

Headphone connections, remote key switch operation, the loop to increase overall levels, remote LED indication and increased level selected information is all available on a rear panel 15 way D connector.

Features

• Twin headphone limiter
• 2 x GS-XH2 in a 19" subrack
• Headphone connections on 5 pin XLR
• 85dB limit
• Secure key allows override to 90 dB