Bosch PRM-4P600 - Set the Loudspeaker Parameters (SPEAKER EQ)

Power amplifier Installation | en 19
Bosch Security Systems B.V.
Installation manual
2023-01 | V02 | F.01U.402.247
5.1.3 Set the loudspeaker parameters (SPEAKER EQ)
The amplifier’s SPEAKER EQ enables the output audio to be optimized to suit particular types
of speakers (e.g. subwoofers) or particular environments, allowing some optimization for
voice/speech by reducing the low frequency feedback.
APD
AMP MODE
CH 1
CH 2
CH 1
CH 2
OFF
ON
100 V
4 Ω
8 Ω
70 V
LP
FLAT
HP 1
HP 2
DUAL PARALLEL CH 1/2
SPEAKER EQ
CH3
CH4
CH3
CH4
100 V
4 Ω
8 Ω
70 V
LP
FLAT
HP 1
HP 2
IN1 to ALL
OFF
ON
DUAL PARALLEL CH 3/4
AMP MODE SPEAKER EQ
Mode CH 1 - 4 switches Description
HP1 Up Up High Pass filter 100Hz @ 24dB/Oct.
HP2 Up Down High Pass filter 150Hz @ 24dB/Oct.
LP Down Up Low Pass filter 150Hz @ 24dB/Oct.
FLAT Down Down Full range operation
– HP1 is optimized for speech and voice announcements as a way to reduce low frequency
feedback and microphone handling noise.
– HP2 is useful for use with Mid‑High loudspeakers in 2‑way speaker systems that contain
subwoofers or to further reduce low frequency content from the loudspeakers.
– LP is useful when connected to subwoofers and can be used in combination with HP2.
– FLAT is designed for full range operation and contains a 30Hz 24dB/Oct high‑pass filter
for both 4Ω and 8Ω operation or the 50Hz 24dB/Oct high pass filter when used in
70/100V operation.
Refer to
– Indicators, controls and settings, page 16