PRESONUS TUBEPRE User Manual download pdf (Page 12)

3.1 OPERATION

3.2 Dynamic Microphones

Lower output levels characterize dynamic microphones, so more gain

is needed to achieve sufficient operating levels. Occasionally it is

necessary to add the -20dB pad to the microphone to avoid distortion

(e.g. when recording percussion). Do not use phantom power when

using dynamic microphones.

3.3 Phantom Powered Microphones

Phantom powered microphones such as condenser and some ribbon

microphones require external power to preamplify the microphone.

These microphones typically have much higher output than dynamic

microphones. Therefore the -20dB pad is almost always necessary

when close mic-ing to avoid clipping (overdriving) the preamplifier.

3.4 Instrument Input

The instrument input is designed to handle 1/4” plugs from

instruments such as guitars and basses. This instrument input is an

ultra high impedance amplifier designed to allow the full audio

potential of an acoustic or electric instrument pickup. Plugging a

preamplified signal (line level) into the TubePRE is not recommended.

3.5 Some Thoughts on Vacuum Tubes

The TubePRE comes supplied with a 12AX7 vacuum tube that meets or

exceeds the stated performance criteria for the unit. We expect some

owners of the TubePRE will try different tubes to investigate the

various performance possibilities they might provide. Remember, tube

life and performance are affected by how often a tube is used and by

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PRESONUS TUBEPRE User Manual Page 12