Owner`s manual

LSP-1 Speaker Processor Owner's Manual v 2.2 ©2000 ARX® LSP-1 Speaker Processor Owner's Manual v 2.2 ©2000 ARX®4
5
Model LEDs
One of this group of LEDs light up to show which Plug-in card is installed in
Channel A, and that the unit is connected to AC power.
Channel A level trim
This control lets you adjust the input level to the Channel A circuitry. During
normal operation it is set at the maximum (10) position. However, in applications
such as array systems, monitors, etc, it may be reduced as required.
Note: this is an attenuator only, not a gain control. Setting this level too low may
reduce the headroom in the preceding equipment.
Level control
This control determines the Low Frequency output of your system. During normal
operation it is set at UNITY,the 0 dB nominal operating position (12 o’clock). It also
provides up to +6 dB of gain past unity. This can be used for 2 purposes:
1. To achieve an increase in Low frequencies in relation to the Highs
2. Level compensation for amplifiers with differing input sensitivities
SIGNAL/ISC LEDs
The Signal LED shows you that some signal is running through the LSP-1. The ISC
LED indicates that the Interactive System Control protection circuitry is operating
on the Channel A output. During normal operation this LED will light up on
transients or peaks if the system is being used to achieve high SPL. This is normal,
and doesn’t indicate that the system is being overdriven.
However, if this LED is on for the majority of the time, then the Low level is too
high and should be reduced accordingly.Channel Active/Mute Switch and LEDs
When pressed IN, this switch mutes the Output of Channel A
Phase Reverse switch and LEDs
This switch changes the Low Frequency output phase of the LSP-1 by 180
o
Channel B controls identical to Channel A
Push In for MONO switch
This switch sums the two Low Frequency outputs and delivers two identical mono
outputs
Rear Panel Connections
Input A: Connect signal feed from Console here
Output A: Connect signal feed to the Power Amp here
Loop Out to System A: Connect signal feed to the rest of the system here
LSP-1 Front Panel controls
6 pin ISC Connector
The White and Blue Interactive System Control leads, on 6 pin XLR connectors,
plug in here. The WHITE leads connect to the OUTPUTS of the LOWamplifier
Channel A, in parallel with the leads going to the speakers. The BLUE leads connect
to the Outputs of the LOW amplifier Channel B, in parallel with the leads going to
the speakers.
These leads allow the LSP-1 to monitor the output of the amplifiers, and to activate
the speaker protection circuits if the power exceeds the maximum safe operating
area of the speaker. The LSP-1 won’t turn on until you make these connections.
• Make sure you don’t get these mixed up - make sure that the Channel A ISC
leads are connected to the Channel A amplifiers, and Channel B leads to the
Channel B amplifiers, or you will end up with the Channel A ISC controlling
Channel B and vice versa, which can give very strange results.
• Work slowly and carefully, and take the time to get it right. It’s a good idea to
mark all leads as you go, so you can visually check all connections before powering
up.
Channel A &
B Inputs
from console
Loop Output to
LSP-2 Input B
6 pin ISC
connector
To amplifier
Inputs A and B
to LF speakers A
to LF speakers B
Channel A and B
ISC return leads
back to LSP-1
Loop Output to
LSP-2 Input A