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  4. Acoustic Reference Amplifier
  5. User Manual

L.R. Baggs Acoustic Reference Amplifier User Manual

Summary of Acoustic Reference Amplifier

  • Page 1

    Acoustic reference amplifier r e l e n t l e s s i n n o v a t i o n i n a c o u s t i c a m p l i f i c a t i o n user’s guide.

  • Page 2

    As an owner of this acoustic reference amplifier, you now own a piece of audio history! This is the first acoustic guitar amplifier to use a flat-panel balanced mode radiator speaker. This single groundbreaking loudspeaker covers the entire audio spectrum for breathtaking fidelity and outstanding cl...

  • Page 3

    Important safety instructions 1 quick start 2 about reference amplifier 3 balanced mode radiator (bmr) loudspeaker 3 industrial design 3 class-d amplifier module 4 all-discrete preamplifier 4 spring reverb 4 positioning the amplifier 4 the cover 4 front panel 5-6 back panel 7-8 power modules 9 trick...

  • Page 4: W A R N I N G

    • read these instructions. • keep these instructions. • heed all warnings. • follow all instructions. • do not use this apparatus near water. • clean only with dry cloth. • do not block any ventilation openings. Install in accordance with the manufacturer’s instructions. • do not install near any he...

  • Page 5

    1) make sure power switch is off - the “o” indicator on the switch is pushed in. 2) if needed, select 230vac setting - the amplifier is preset to the 115vac setting (usa standard). If needed, select the 230vac (europe) on the voltage selector using a coin or screwdriver. 3) plug in the amplifier - p...

  • Page 6

    T his section contains information about the design and construction of your a coustic r eference a mplifier . Reference amplifier when designing this product, we felt that the name “guitar amp” did not fully capture the capabilities of this product. In fact, we found that we enjoyed listening to al...

  • Page 7

    Class-d power amplifier although digital amplifiers are not new, they have developed by leaps and bounds over the last couple of years. One of the major benefits of digital amps is that they are very efficient. Due to this, they do not need large power supply components that make amplifiers very hea...

  • Page 8

    The indicator led lights to show that phantom power is “on.” it is generally good practice to keep phantom power off when it is not in use. The button is recessed to ensure that the power does not become accidentally activated. You may use a guitar pick, pen, or long fingernail to press in the pushb...

  • Page 9

    6) notch this amplifier incorporates the garrett null anti-feedback notch filter found on many of our preamps. Sonically it is virtually invisible and it can be used to sweep the primary feedback range of the guitar (60hz - 320hz) to cut out a frequency that is causing feedback or ringing. This cont...

  • Page 10

    1) d.I. Pre/post switch this pushbutton switch allows you to add the eq and internal reverb to the d.I. Output or to send a “dry” signal straight from the channel input stage. When playing live or recording in a venue where you have an audio engineer that will set a mix for you in the house, you wil...

  • Page 11

    7) ch1 send the output for a series effects loop on channel 1. Connect an unbalanced 1/4” cable from this jack to the input of an effects pedal or rack device. If only the send is connected, the signal is not interrupted so you could use this as an independent 1/4” output as well. 8) ch1 return conn...

  • Page 12

    1) voltage selector switch you must correctly select the appropriate voltage for the location in which you will be using the amplifier. The markings are for 115v 60hz and 230v 50hz because these are the most common. However, the power supply is able to handle a wider range of power options shown in ...

  • Page 13

    1) setting the gain with the vu meters the knob labeled as “gain” next to the amplifier inputs is a control that combines three different functions. This knob gives you control over the input gain of the 1/4” input (guitar cable), the input gain of the xlr input (microphone cable) and also sets the ...

  • Page 14

    3) using the efx loops the efx loops on the back of the amplifier are individual channel effects loops. These loops allow you to plug in external effects devices such as rack effects units, footpedals, in-line tuners, etc. In line with each channel. A standard mono guitar or instrument cable should ...

  • 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 footswitc...

  • Page 16

    Please note: the bmr loudspeaker is not warrantied against damage. Even though we provide a limiter to help protect the speaker, it is up to you to not abuse the loudspeaker. This device is designed as an acoustic guitar amplifier and it is not recommended to play electric or bass guitars at loud vo...

  • Page 17

    1/4” input input impedance 10 megohms preamp gain - ∞ to + 40db input level - 40dbv to +20dbv (.01vrms to 3.53vrms) xlr input input impedance 6.8k ohms (each leg of balanced) preamp gain - ∞ to + 50db input level -50dbv to +12dbv (.003vrms to 4.2vrms) aux input input impedance (1/4” mono) 6.6k ohms ...

  • Page 18

    B l o c k d i a g r a m 15 16.

  • Page 19

    Lr baggs corporation warrants that the lr baggs acoustic amplifier you have purchased shall be free from defects in parts and workmanship if used under normal operating conditions for a period of one (1) year from the date of purchase, except the speaker components which are warranted for a period o...

  • Page 20

    483 n. Frontage rd., nipomo, ca 93444 · p 805.929.3545 · f 805.929.2043 · www.Lrbaggs.Com.