Summit Audio FeQ-50 Passive Tube/Solid State EQ - Manual (Page 6)

Front Panel
6 Summit Audio, Inc.
High Pass Filter
To reduce rumble or sub-audio frequencies, you have the
option to enable this virtually transparent highpass filter. The
frequency is fixed at 30Hz with a gentle 6dB/octave relief.
Bypass Switch
This switch bypasses all the passive EQ sections, but NOT
the tube output stage which allows you to use the FeQ as a
tube enhancement device to add warmth and natural sound
to your digital recordings even when you don’t need the EQ.
The FeQ-50 can also be used to convert -10dB (consumer)
level signals into +4dB (professional) level.
Important - Please Read!
The FeQ-50 contains a vacuum tube which
generates heat.
Do not block the cooling holes on the top of the
FeQ-50 and always allow adequate ventilation when
mounting the unit in a rack enclosure.