Operation | Behringer T1953 manual

TUBE ULTRAGAIN T1953

SERIAL NUMBER. Please complete and return the warranty card within 14 days of the date of purchase. Otherwise, you will lose your right to the extended warranty. Alternatively, you can register online at our website under www.behringer.com.

FUSE HOLDER / VOLTAGE SELECTION. Before connecting the T1953, confirm that the voltage display matches your local mains voltage. When replacing the fuse, you must always use the same type. In many units the fuse holder can be installed in one of two positions, allowing you to switch between 230 V and 120 V. If you wish to operate a unit outside Europe at 120 V, then a stronger fuse must be used (see chapter 6 “SPECIFICATIONS”). The mains connection is made via the IEC receptacle. An appropriate mains cable is included.

AUDIO IN. These are the audio inputs of your TUBE ULTRAGAIN, available both as balanced 1/4" TRS and XLR connectors. The XLR connector is the common mic/line input. Both the XLR and the jack connector accept unbalanced as well as balanced signals. See chapter 5 “INSTALLATION” when wiring unbalanced.

AUDIO OUT. These are the audio outputs of your TUBE ULTRAGAIN. Matching 1/4" TRS and XLR connectors are wired in parallel. The nominal level is +4 dBu. The maximum output level is +16 dBu.

2. OPERATION

Before you can use the BEHRINGER TUBE ULTRAGAIN as a preamp, we recommend that you study the various functions of the device. The high gain factors provided by the microphone preamp can produce extreme levels on the output side, which may damage subsequent devices. So, you should start with the following basic setting:

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+48 V switch	OFF
MIC TRIM control	10 dB
MICROPHONE/LINE switch	LINE
PHASE REVERSE switch	OFF
HIGH PASS switch	OFF
LEVEL control	0 dB

Tab. 2.1: Basic setup of the TUBE ULTRAGAIN

Reduce the volume level of the subsequent audio system to a minimum, and connect a microphone to the XLR input connector on the BEHRINGER TUBE ULTRAGAIN. Use either the 1/4" TRS or XLR output connectors to connect the audio system. Owing to its output-side servo-balancing circuit, the TUBE ULTRAGAIN detects whether you use a balanced or unbalanced configuration and adjusts the level internally.

Now, power up the entire equipment and press the MIC/LINE switch upwards to activate the microphone preamp. If you wish to use a condenser mic requiring +48 V phantom power, please press the +48 V switch.

+Please make sure that you are using an appropriate microphone before you switch on the +48 V supply. Read the operating instructions accompanying the microphone. Some condenser mics might need another type of power supply, older dynamic microphones could be damaged by the +48 V voltage, and unbalanced microphones should never be operated in combination with a +48 V power supply.

Configure the equipment according to the application on hand, speak into the microphone and turn the GAIN control clockwise until the 0 dB LED lights up. If your DAT recorder, mixing console or other subsequent devices have high-precision level meters, you can use these to verify the correct level setting.

The maximum output level depends on the device that follows next in the audio chain, and must therefore be set specifically. The high-precision level meter on the TUBE ULTRAGAIN indicates the current operating level. The CLIP LED lights up at a level of +18 dBu signaling that you have an additional headroom of 5 dB available, before the microphone preamp starts overloading. If distortion/overloading occurs at high volume levels, you should reduce the gain with the MIC TRIM control.

10	2. OPERATION