LSP-2 Speaker Processor
Owner's Manual v 2.2 CE ©2000 ARX®
LSP-2 Speaker Processor
Owner's Manual v 2.2 CE ©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
These controls let you adjust the input level to the unit. During normal operation it
is set at the maximum (10) position.
Note: this is an attenuator only, not a gain control. Setting this level too low may
reduce the headroom in the preceding equipment.
All remaining controls are recessed behind an acrylic security cover to prevent
unauthorized access. Unscrew the knurled nut at each end of the cover and lift off
to make adjustments. Replace security cover afterwards.
Band 1 (the Lower filter) control
This control determines the Low Frequency output of your system. During normal
operation it is set at the 0dB (unity) 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
Band 1 Signal/ISC LEDs
The Signal LED shows you that some signal is running through the LSP-1. The ISC
LED indicates that the ISC protection circuitry is operating on the Low (Band 1)
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 should not be taken as
an indication 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.
Band 2 (the Higher filter) control and Signal/ISC LEDs
Same as for Band 1(Lower) but applicable to the Higher filter
VHF level trim control
This control determines the Very High Frequency energy output of your system. It
provides control from -12 dB (Hard LEFT) through to 0 dB/unity (Hard RIGHT). It
should be set in the 0 dB position for a flat response, but for a more musical response
you can rotate it anti-clockwise until the desired roll off is achieved.
Channel B controls are identical in operation
Rear Panel Connections
Input A:
Connect signal feed from the Console here
Output Band 1 (LF) A:
Connect the signal feed to the Lower Frequency Power Amp
here
Output Band 2 (HF) A:
Connect the signal feed to the Higher Frequency Power
Amp here.
Channel B connections identical
Connecting the ISC leads (Important!)
The White and Blue ISC leads, on 6 pin XLR connectors, plug into the correspond-
ing sockets on the rear of the Control Unit.
These leads allow the LSP-2 to monitor the output of the amplifiers, and to activate
the protection circuits if the power exceeds the maximum safe operating area of the
speaker.
The unit won’t turn on until you make these connections!
• The WHITE leads connect to the OUTPUTS of the LOW amplifiers, in parallel
with the leads going to the LOW speakers. The BLUE leads connect to the Outputs
of theHIGH amplifier, in parallel with the leads going to the HIGH speakers.
•
Don’t
get these mixed up as you will end up with the LOW ISC controlling the
HIGHs, and vice versa, which can cause major speaker damage to the HIGH
drivers.
• Make sure that the
Channel A
ISC leads are connected to the
Channel A
amplifi-
Front Panel controls
Channel A Input from
console (or LSP-1 Loop
outputs)
Channel A Band 1
(Low) and Band 2
(High) Outputs
6 pin ISC
connector for
Channel A
To Low and High
amplifier inputs
Channel A
To Low speaker
To High speaker
Channel A Low and
High ISC return leads
back to LSP-2
Only Channel A connections shown
in diagram. Channel B connections
identical but omitted for clarity