TL Audio 5001 - Manual (Page 14)

unless you are using multiple mics through the 5001 and some phase
cancellation is occurring.
7. Try backing off the input gain and then steadily bringing its level up so that
the Drive LED glows brighter - you should notice an audible change in sound
character as the valve stage is driven harder. This variation in tone is one of
the great strengths of the 5001 - you have the option of running it very clean,
or nice and warm as you increase the valve drive.
6. SPECIFICATIONS
Mic Gain Range:
+16dB to +60dB
(-14dB to +30dB with pad).
Input Noise (EIN):
-127dB (20Hz to 22KHz, maximum
gain, 150 ohm termination).
Maximum Mic Input Level:
+4dBu (+30dBu with pad).
Mic Frequency Response:
20Hz to 40KHz, +0, -2dB (40dB
gain).
Instrument Gain Range: +10dB
to +40dB.
Maximum Instrument Input Level: +10dBu.
Instrument Input Impedance: 1Mohm.
Instrument Input Frequency Response: 20Hz to 40KHz, +0, -2dB.