Summary of Contents for L.R. Baggs Acoustic Reference Amplifier
- Page 1 R e l e n t l e s s i n n o v a t i o n a c o u s t i c a m p l i f i c a t i o n...
- Page 2 C o n g R A T u l A T I o n s ! 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.
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Page 3: Table Of Contents
T A B l e o F C o n T e n T s IMPoRTAnT sAFeTy InsTRuCTIons QuICk sTART ABouT Reference Amplifier Balanced Mode Radiator (BMR) loudspeaker Industrial Design Class-D Amplifier Module All-Discrete Preamplifier spring Reverb Positioning the Amplifier The Cover FRonT PAnel BACk PAnel... -
Page 4: Important Safety Instructions
I M P o R TA n T s A F e T y I n s T R u C T I o n s • Read these instructions. Wherever this symbol appears, it alerts you to the presence of un- •... -
Page 5: Quick Start
Q u I C k s T A R T WARnIng: PleAse ReAD THe sAFeTy InsTRuCTIons BeFoRe usIng THe AMPlIFIeR. 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. -
Page 6: About
At the heart of the amplifier is a patented Balanced Mode Radiator. The BMR is a new type of loudspeaker that has its world debut in the Acoustic Reference Amplifier. It creates and radiates sound in a fundamentally different and better way. This groundbreaking innovation is the brainchild of the eminent speaker designer Dr. -
Page 7: Class-D Amplifier Module
Due to this, they do not need large power supply components that make amplifiers very heavy (think of an original Fender Twin). This is one of the ways that we have kept the weight of the Acoustic Reference Amplifier to a mere 28 lbs. -
Page 8: Front Panel
F R o n T P A n e l 1) pHantom poWeR anD inDicatoR leD impoRtant note: You should always have the channel muted, the gain turned down or the master volume down when activating or deactivating the phantom power button. This control supplies both +48V phantom power on the XlR input and +9V “pull-up”... - 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.
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Page 10: Back Panel
B A C k P A n e l 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 will usually want to send them a “dry”... - 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 Connect the return from the output of an effects pedal or rack device to complete the effects “loop.”...
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Page 12: Power Modules
P o W e R M o D u l e s 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 the sPeCIFICATIons section towards the end of the user Manual. -
Page 13: Tricks, Tips And How-To's
T R I C k s , T I P s A n D H o W T o ’ s 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”... -
Page 14: Using The Fx Loops
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 be used to go from the “send”... -
Page 15: Daisy-Chaining Amplifiers (Linking More Than One Together)
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). -
Page 16: Power Amplifier
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 VoluMes THRougH THIs sPeAkeR As DAMAge MAy oCCuR. -
Page 17: Specifications
s P e C I F I C A T I o n s 1/4” input Input Impedance 10 megohms - ∞ to + 40dB Preamp gain Input level - 40dBv to +20dBv (.01Vrms to 3.53Vrms) XlR input Input Impedance 6.8k ohms (each leg of balanced) - ∞... -
Page 18: Block Diagram
B l o C k D I A g R A M... -
Page 19: Warranty
1 - y e A R l I M I T e D W A R R A n T y 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 of ninety (90) days from the date of purchase. - Page 20 483 n. Frontage Rd., nipomo, CA 93444 · p 805.929.3545 · f 805.929.2043 · www.lrbaggs.com...