5.3.2 Headroom, sensitivity and VPL / Gain settings
If you use the level potentiometer in the signal chain to
reduce the level by an amount greater than the headroom
relative to input sensitivity, AND you drive the amplier to clip
level, you are in danger of clipping the input stage before the
current or voltage peak limiters are activated.
When bridging two channels, you must add +6 dB to
the input sensitivity to achieve maximum output voltage
due to the automatic -6 dB gain compensation inserted
by the amplier.