LR Baggs Acoustic Reference Amplifier - Manual (Page 15)

The footswitch requires the use of a standard mono/instrument cable and a pedal designed to short the tip to the sleeve or the ring of the
cable (both will be grounded with a mono cable). When the tip is shorted to ground the signal will be muted. The signal is not actually run
down to the footswitch and back - it is a remote control. Therefore, the quality and length of the cable used is not important. unshielded
cable such as speaker cable could even be used if necessary.
Do not try to put any signals into the footswitch jack. As well, do not connect the footswitch jack to the input of any device. only use it
with a footswitch pedal.
6) DaisY-cHaininG amplifieRs (linKinG moRe tHan one amplifieR toGetHeR)
If you would like to, you may link more than one Acoustic Reference Amplifier together to allow for higher sound levels when performing
outside, in larger venues or for wider dispersion while playing in open areas such as patios. This will noT put the amplifiers in stereo (see
note at bottom about stereo). The amplifiers will be connected in a mono chain with one acting as the main control. We have added a
feature on the amplifier to help you do this. The major benefit of running the amps in this “daisy-chain” mode is that you can do all of your
gain, eq, reverb, etc. on one of the amplifiers and control the output from the second amplifier directly from the first amp.
Here is how to set it up. you will need two Acoustic Reference Amplifiers - or one and a second powered monitor. next to the line output
is a pushbutton labeled “pre/post master.” The standard setting is “pre master” in the out position so that you can take a line output
independent of the master volume. However, if you push it into the “in” position, you will be able to control the volume of the line out
directly with the volume of the speaker. now run a standard 1/4” mono guitar/instrument cable from the line out and into the “aux in”
(preferred) or a channel input of the second powered amplifier. you will now just have to balance the output of the second amplifier using
the aux lev control and the master vol control. once set, everything you do at the first amplifier will control the output of the second
amplifier. This includes muting, gain, reverb, eq, effects loops, etc.
sTeReo: If you would like to run two amps in stereo, you will have to use an effects device that takes a mono input and creates a stereo
signal out of it. or you can use a standard mixer. Run from “left” and “right” into either the inputs or “aux in” (preferred) and you have a
very good stereo PA. We have been very impressed with running these amplifiers in a stereo setup. Have fun!!
7) D.i. output featuRes
We have included two features on the D.I. output to make it more versatile for you:
First, on the right side of the D.I. output we have included a ground lift switch which may help remove a ground loop hum that could
occur if you have two powered devices connected together (such as connecting the D.I. output to a mixer). In our experience, a ground
lift switch works about half of the time. If you are having a terrible time with ground loops, you might want to look into some of the
many different types of filtering and ground lifting products on the market that claim to be able to defeat ground loops. ground loops
are ultimately an issue with the wiring in the building and/or the setup of the PA and may be beyond the scope of this ground lift device.
When “lifted” the ground is connected through a 100nF capacitor and a 150-ohm resistor. Press the button in to lift the ground.
second, on the left side of the D.I. output, we have included a pre/post switch that is designed to give you more control over what signal
you send from this output. The “pre” setting is with the pushbutton in the out position. In this position the signal is completely “dry.” It
comes directly after the input stage so that there is gain, but the eq, effects loops, reverb, notch, etc. will not affect the D.I. output signal. If
you depress the pushbutton switch, the D.I. output signal will come from after the eq, effects loops, reverb, notch, etc. The master volume
will never affect the D.I. output. Muting the input will cut that signal from the D.I. output in both pre and post modes.
8) speaKeR limiteR
The Acoustic Reference amplifier has a built-in limiter to protect the speaker. The limiter is completely transparent and will not be
noticeable during normal playing conditions. As you turn the volume up, you may notice that the volume simply stops increasing at
about 106dB. As the limiter engages the indicator leD next to the master vol control will begin to light up.
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