PreSonus TubePRE - Manual (Page 14)

10
With a compressor/EQ/dynamics processor
When running the Tube Pre in conjunction with other processors it is
recommended that the TubePRE be the first unit in the chain. The
other units should be connected to the output (either XLR or 1/4”) of
the TubePRE. Most compressors require that the signal be preamplified
before they are connected. This simply means that the signal is loud
enough for the compressor to process it. In most cases (and there are
exceptions) if you were to plug a microphone/guitar directly into a
compressor the signal will be too low (essentially too quiet) for the
device to process it.
On Recording
When using the TubePRE as a front end for a recording device (such as
the Presonus FIREstation), it is important to watch your output levels.
For example, using the TubePRE for distortion (turning up the gain and
tube drive REAL HIGH) could overload the inputs of the recording
device. In this scenario it is necessary to limit the output level of the
TubePRE. This can be accomplished by using a compressor/limiter
(such as the Presonus BlueMAX).
3.6 FAQ/Troubleshooting
Can I switch the tube?
The TubePRE’s tube can be switched as long as it is a 12AX7. Proper
caution must be taken when switching the tube. Please refer to Section
3.5 of this manual for further directions on changing the tube or check
our website at www.presonus.com.