User manual BEHRINGER T1953

[. . . ] T1953 Users Manual Version 1. 2 December 2002 TUBE ULTRAGAIN ENGLISH TUBE ULTRAGAIN T1953 SAFETY INSTRUCTIONS CAUTION: To reduce the risk of electric shock, do not remove the cover (or back). No user serviceable parts inside; refer servicing to qualified personnel. WARNING: To reduce the risk of fire or electric shock, do not expose this appliance to rain or moisture. This symbol, wherever it appears, alerts you to the presence of uninsulated dangerous voltage inside the enclosurevoltage that may be sufficient to constitute a risk of shock. This symbol, wherever it appears, alerts you to important operating and maintenance instructions in the accompanying literature. [. . . ] Vocal sounds gain in presence and volume, without masking other instruments. Thus, voices become a more integral part of the overall mix. Synthetic sounds, especially MIDI guitar sounds become more real and natural than without the TUBE ULTRAGAIN. So, with the TUBE ULTRAGAIN you can adopt a more active approach during the mixdown process and work out subtleties, while focusing particularly on the musical aspects of your recordings. When the TUBE ULTRAGAIN is used as a microphone preamp or as line driver, this effect can be obtained at the recording stage. But tracks that are already laid can benefit from processing by the TUBE ULTRAGAIN. Make sure that the unit is switched to line, and that the PHASE REVERSE and HIGH PASS switches are not engaged. You can insert the TUBE ULTRAGAIN in the channel or subgroup inserts of your console. The TUBE ULTRAGAIN can also easily be used on the entire mix, when inserted in the main mix bus or as a serial devices between the desk and for instance a DAT recorder the whole mix can benefit from the warm tube sound. 4. TECHNICAL BACKGROUND The steady development of modern sound reinforcement systems has made it possible to produce almost any level of loudness. Yet, the increase in loudness goes in line with a need for optimized audio quality. Today, audiences expect to hear a powerful and transparent sound. To fully understand how the BEHRINGER TUBE ULTRAGAIN works you will need to know the meaning of a decibel and how audio dynamics work. With the TUBE ULTRAGAIN, as with any other type dynamics processor the amount of boost/attenuation applied is expressed in decibels (dB). The abbreviation dB is not a unit (although often used as one), but describes a logarithmic proportion. The entire dynamic range of human hearing (from the threshold of audibility to a jet-airplane, see fig. 4. 1) starts with about 0. 00002 Pa (threshold of audibility) and goes up to 130 Pa (threshold of pain). This also means that 0 dB is not silence, minus infinity dB will mean absolute silence. TECHNICAL BACKGROUND TUBE ULTRAGAIN T1953 160 Jet Engine 140 Threshold Of Pain Sound-Pressure Level (dB SPL) 120 Power Drill 100 Machinery Hall "Loud" Office Normal Conversation Quiet Apartment Recording Studio 80 60 40 20 Falling Leaves 0 Threshold Of Audibility Fig. 4. 1: Dynamic range of human hearing The range of sound pressure levels or the dynamic range of human hearing encompasses a factor of 10, 000, 000. This enormous range of values is difficult to handle and additionally does not represent the subjective perception of sound, since human hearing tends to use a logarithmic curve. When an increase in loudness by the factor two is perceived as one step, four times the loudness level equals two steps. [. . . ] Damages/defects caused by the following conditions are not covered by this warranty: s improper handling, neglect or failure to operate the unit in compliance with the instructions given in BEHRINGER user or service manuals. s connection or operation of the unit in any way that does not comply with the technical or safety regulations applicable in the country where the product is used. s damages/defects caused by force majeure or any other condition that is beyond the control of BEHRINGER. Any repair or opening of the unit carried out by unauthorized personnel (user included) will void the warranty. [. . . ]