QSC Audio HPR122i - Manual (Page 11)

11
GAIN Control
The GAIN control is marked in dB of attenuation. There are
21 detents for repeatable adjustments. Turn the GAIN con-
trol clockwise to increase gain and counter clockwise to
decrease gain.
The upper 14 steps are about 1 dB each and settings
should normally be made within this range. When operat-
ing with the GAIN set below -15 dB, it may be possible to
exceed input headroom. If this is the case, reduce the input
signal strength and increase the gain of the loudspeaker
amplifier.
Subwoofer Gain Notes
Scenario: One input signal only to the subwoofer,
one full-range loudspeaker for each subwoofer- The
HPR loudspeakers are designed to be used as a system,
typically using one subwoofer for each full-range loud-
speaker. If the subwoofer and the full-range loudspeaker
have their Gain controls set identically, the tonal balance
will be correct (or very close to correct).
Scenario: Two input (L+R) signals to the subwoofer,
and two full-range loudspeakers per subwoofer-
When two inputs (L+R) are applied to the subwoofer, an
additional gain of 6dB is automatically applied to the sub-
woofer. The additional gain is added to the subwoofer to
keep the tonal balance correct for use with two full-range
loudspeakers.
100 Hertz Low-Cut Filter Switch:
HPR122i, HPR152i, and HPR153i
Below the LED indicators is a small recessed slide-switch
that enables or disables a 100 Hertz low-cut filter.
Filter OFF (Full Range)
Turn the filter OFF when using without subwoofers or dedi-
cated low-frequency enclosures.
Filter ON (100 Hz Low-Cut)
Turn the filter ON when using with optional subwoofers or
low-frequency systems. This results in proper subwoofer
operation and allows the top box to provide improved clar-
ity in the middle and high frequencies. HPR122i: If using
as a floor monitor, turn the filter ON for improved vocal
range clarity and to reduce low frequency build-up on
stage.
Gain control.
HPR152i and HPR153i 100 Hertz low-cut filter switch.
HPR122i 100 Hertz low-cut filter switch.