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7 REFERENCE AMPLIFIER A500 User Manual
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CHANNEL INPUT 1 (MONO)[6] . Connect the signal source whose output needs
to be amplified.
Please use only one of the three input connectors per channel at any ◊
one time!
Here you will connect an output of your mixing console, your HiFi preamp or
another signal source.
Our rack mixing console EURORACK PRO RX1602, with its eight mono-usable
balanced stereo channels, is an ideal choice for signal processing and
source selection.
The connections for both channels are laid out as RCA, XLR and ¼" TRS stereo
connectors. The cinch inputs are intended for use with outputs laid out as
unbalanced signals with a -10 dBV line signal level. Because these inputs
are more sensitive than others, you can directly connect a CD player or a
DAT recorder. Of course this input can also be used for connecting mixing
consoles and similar equipment.
The XLR and ¼" TRS stereo connectors are laid out balanced, but they too can
of course be used to connect unbalanced signals. Their sensitivity is +4 dBu
(also see ch. 4).
Generally speaking, you should choose balanced over unbalanced signals in
order to guarantee the highest noise protection.
Due to safety considerations, the inputs can not be used in parallel.
However, if you are using cinch and XLR or ¼" TRS connectors
simultaneously, the cinch input is given preference, and the other signal
is muted.
If you wish to use the A500 in mono-bridged mode, ◊
please only use one of the channel 1 inputs!
CHANNEL INPUT 2[7] . These are the inputs for channel 2.
The [8] STEREO/BRIDGED MONO switch is used to toggle between the two
operating modes of your A500.
Please power the A500 down using the POWER switch each time you ◊
change the operating mode. Similarly, only connect/disconnect speaker
connectors if the A500 has first been powered off!
OUTPUT 1, OUTPUT 2[9] and BRIDGED MONO: These are the speaker
connectors of your A500 laid out as ¼" TS mono connectors. When in
mono-bridged mode, only use the BRIDGED MONO output.
Keep in mind the minimum power impedance of 4 Ohms per channel ◊
in stereo mode. When in mono-bridged mode, a loudspeaker whose
impedance is at least 8 Ohms must be used.
In addition to XLR or ¼" TRS connectors, you can also use binding posts for [10]
connecting speaker cables. When in mono-bridged mode, make sure to
connect your cables to both middle connectors–as shown on the unit itself.
FUSE SWITCH/VOLTAGE SELECTION[11] . Before connecting the unit to the
mains, please check if the voltage selector corresponds to your local voltage.
When replacing fuses, you should only use fuses of the same type and rating.
With some units, the fuse switch can be put into two different positions in
order to select between 230 V and 120 V operation. Please bear in mind:
If you wish to use your equipment outside of Europe running on 120 V,
you will have to use a fuse with a higher Ampere value.
The mains connection is made via a standard [12] IEC RECEPTACLE. A matching
cable is enclosed.
SERIAL NUMBER[13] .
Application Examples3.
Stereo mode3.1
In this mode, both channels run independently with a separate input signal.
Connect passive loudspeakers, preferably high-quality studio monitors, such
as the BEHRINGER TRUTH B2031P. Set the STEREO/BRIDGED MONO switch [8] to
“STEREO” to enable stereo mode.
Please use the POWER switch to power down your A500 before making ◊
any changes to the operating mode settings.
Keep in mind the minimum load impedance of 4 Ohms per channel in ◊
stereo mode.
Fig. 3.1: A500 in stereo operation
Additional examples:
Two independent mono signals, e.g. instrument signal and monitor mix•
Bi-amp operation, with the bass signal on channel 1 and the treble signal •
on channel 2
Mono-bridged mode3.2
In this mode, the voltages of both channels are added up and routed to just
one loudspeaker. This results in a doubling of voltage, quadrupling of the peak
power value and roughly trippling of the continuous power output on a single
channel. The input and the gain control on channel 1 are used in mono-bridged
mode. Thechannel 2 control elements are not used. ATTENTION: To avoid
cancellations due to internal phase inversion, the GAIN control on
channel 2 must be turned all the way to the left!
Use this operating mode to feed the output of both channels into a single 4-Ohm
load. Set the STEREO/BRIDGED MONO switch [8] to “BRIDGED MONO.”
XENYX 2222FX
Ctrl. Room out
Input
Channel 1
REFERENCE AMPLIFIER A500
Input
Channel 2
TRUTH B2031P
R
L