BSS Audio AR-133 Owner's Manual - Manual (Page 2)

Functions and Facilities
The Link Connector
Normally, the 1/4" LINK socket carries a parallel-wired direct feed from the input. Optionally,
an internal link passes this signal through an active isolating buffer amplifier. This link must
be changed by an Authorised Technician only. Please consult your Distributor/Dealer for
details.
The On/Off Switch
The On/Off switch is used for both phantom power and battery. To avoid battery drain when
the unit is not in use, ensure that this switch is set to the upper OFF position when storing or
packing the AR-133. Optionally, an internal link can allow phantom power to activate the
AR-133 regardless of the On/Off switch setting. This link must be changed by an Authorised
Technician only. Please refer to your Dealer/Distributor for details.
Phantom Power
The AR-133 can work reliably on a wide range of phantom power voltages, although of
course the typical supply provided by modern consoles is +48 volts. The AR-133 accepts
supply voltages of +48 volts down to +20 volts without loss in performance.
While the AR-133 is receiving good phantom power, the power LED is lit continuously.
Should the supply fail for any reason, the AR-133 will switch over automatically to run from
the internal battery (as long as one is fitted!). Under these conditions, the power LED flashes
approximately every 2 seconds.
Installing a battery
To install or replace the internal battery, first undo the knurled screw on the battery compart-
ment - DO NOT undo the flush panel screws. The battery cover should now fold back
towards the edge of the unit, revealing the compartment. Attach the flying lead battery
terminals to your battery, and slide the battery into the compartment, with the connector
towards the outside of the AR-133. For best reliability and long life, we recommend you use
only high quality alkaline batteries in your AR-133.
Cable Management
To keep cables tidy on stage and in the studio, both input and output cables can be arranged
to run in the same direction by bringing one cable back under the AR-133.
The most widespread use of DI boxes is with guitar
pick-ups or keyboards. The optimal setting for this is most
likely with the pad switch set to 0dB, although with some
high-output pick-ups the performance of the AR-133 may
be improved if the pad switch is set to 20dB to prevent
possible clipping of the input. The instrument is
connected to the 1/4” jack socket, and a parallel feed taken
from the other jack socket to the instruments' own
amplifier.
Where 2 or 3 keyboards are used by a
single performer, it is possible to reduce the
number of DI’s needed if a mixer/amplifier
is used by the performer for his or her
personal monitoring. A single AR-133 can
be fed either from a line-level output from
the head (pad set to 20dB) or from the
amplifier power output (speaker output)
(pad set to 40dB).
Using the amplifier's output means that the
signal being fed to the console is post any
effects units and the power stage of the
amplifier, and so will be more
representative of the signal being fed to the
speaker, including any deliberately
introduced overdrive etc. Use the 40dB
setting for this application.
Interfacing additional equipment such as DJ
mixers with the house console and PA may
cause level and connector difficulties. Connect
the DJ mixer to either the jack or XLR input of
the AR-133 (this will depend on the interface
cables to hand which match the output of the DJ
mixer) and then the AR-133's output XLR to the
house console.
Typical Applications