Mesa Rosette Owner's Manual
Owner’s Manual
Greetings from the Home of Tone®
…You, smart player and intuitive human, have put your trust in us to be your amplier
company. is is something that we do not take lightly. By choosing this instrument to be
part of your musical voice, you have become part of the MESA® family… WELCOME!
Our goal is to never let you down. Your reward is that you are the new owner of an amp,
bred of ne heritage, benetting from the many pioneering and patented MESA circuits
as well as fresh cutting edge research and development eorts, leading to this new and
exciting model. We feel confident that this amp will inspire many hours of musical
satisfaction and lasting enjoyment. It was built with you in mind, by players who know
the value of a ne musical instrument and the commitment it takes to make great music.
e same commitment to quality, value and support we make to you… our new friend.
Table of Contents
PRECAUTIONS AND SAFETY INSTRUCTIONS
OVERVIEW _____________________________________________________________________________________ 1
TOP PANEL (CONTROLS & FEATURES)
INPUT JACK ____________________________________________________________________________________ 2
TUNER OUTPUT JACK ___________________________________________________________________________ 2
MUTE FOOTSWITCH _____________________________________________________________________________ 2
POWER LED ____________________________________________________________________________________ 2
BOOST FOOTSWITCH ____________________________________________________________________________ 2
GAIN CONTROL _________________________________________________________________________________ 2
PHASE SWITCH _________________________________________________________________________________ 2
BOOST CONTROL _______________________________________________________________________________ 3
NOTCH FILTER _________________________________________________________________________________ 3
HI-PASS FILTER _________________________________________________________________________________ 3
BASS CONTROL ________________________________________________________________________________ 3
LOW & HIGH Sweepable MID BANDS ______________________________________________________________ 3-4
TREBLE CONTROL ______________________________________________________________________________ 4
MASTER VOLUME CONTROL _____________________________________________________________________ 4
REAR PANEL (CONTROLS & FEATURES)
OPERATING POWER REQUIREMENTS & POWER JACK ______________________________________________4-5
PREAMP OUT XLR JACK _________________________________________________________________________ 5
PREAMP OUT GROUND LIFT SWITCH ______________________________________________________________ 5
PREAMP OUT ¼” (6.3mm) JACK ___________________________________________________________________ 5
EFFECTS LOOP ¼” (6.3mm) JACKS ________________________________________________________________ 5
DIRECT OUT XLR JACK __________________________________________________________________________ 5
DIRECT OUT GROUND LIFT SWITCH ______________________________________________________________ 5-6
DI OUT SOURCE SWITCH _________________________________________________________________________ 6
TROUBLESHOOTING ___________________________________________________________________________ 7-8
SPECIFICATIONS _______________________________________________________________________________ 10
BLOCK DIAGRAM _______________________________________________________________________________11
IMPORTANT SAFETY INSTRUCTIONS
• Read, keep and follow these instructions.
• Heed all warnings.
• Do not use this apparatus near water.
• Clean only with dry cloth.
• Use only with approved AC (mains) power adapters.
• Protect any power cords from being walked on or pinched, particularly at plugs, receptacles, and the point where
they exit from the apparatus.
• Unplug this apparatus during lightning storms or when unused for long periods of time.
• Refer all servicing to qualified service personnel. Servicing is required when the apparatus has been damaged in any
way, such as liquid has been spilled or objects have fallen into the apparatus, the apparatus has been exposed to
rain or moisture, does not operate normally, or has been dropped.
• No naked flame sources, such as lighted candles, should be placed on the apparatus.
• The apparatus shall not be exposed to dripping or splashing and no objects filled with liquids, such as drinks or
vases, shall be placed on the apparatus.
• WARNING: To reduce the risk of fire or electric shock, do not expose this apparatus to rain or moisture.
• To avoid damaging your speakers and other playback equipment, turn off the power of all related equipment before
making the connections.
• Do not use excessive force when handling buttons, switches and controls. Do not use solvents such as benzene or
paint thinner to clean the unit.
• Only connect to an AC power supply adapter that meets the power supply specifications listed on the rear of the unit.
Make certain grounding/earthing conforms with local standards.
Your MESA/Boogie® ROSETTE™ DI-PREAMP is a professional instrument.
Please treat it with respect and operate it properly.
Operating Instructions
Overview
Congratulations on your choice of the ROSETTE™ DI-PREAMP and welcome to the MESA/Boogie® family! First, we would like to
thank you for choosing us as your amplifier company and trusting us to help create your musical voice. This is something we never
take for granted and you’ll find that we are here and ready to assist you should you ever need help. Our goal is to help you sound your
best at all times! We feel confident that your new pre-amplifier will bring you many years of reliable service, rewarding inspiration and
create for you a newfound freedom to express your music. You have chosen an instrument bred of a fine heritage and this model is
yet another testament to our legacy of Tone.
Our goal with the Rosette Series was clear from the start and our commitment to excellence has guided us to what we feel is the
FIRST ACCURATE Acoustic DI Preamp/Pedal and, the Rosette 300 Watt 2x8 Combo Amplifier.
In Rosette, we opted for architecture straight from high-end recording console designs. We developed Input stages that were not the
typical, compromised dual-purpose circuits fed by universal XLR+1/4” combo jacks found on many acoustic amplifiers in the marketplace. Instead, we chose dedicated, time-tested designs, proven over decades of great recordings, to deliver the uncompromised,
accurate truth.
This dedicated acoustic instrument Preamp and DI platform was initially designed for acoustic guitars, but it is also a great choice
for mandolin, ukulele, violin/fiddle, dulcimer, cello, upright bass and other varied acoustic instruments. Not only does The Rosette DI
Preamp include a rich feature set suitable for the professional gigging player, but it also includes touring-grade, Line Level Balanced
Preamp Output and a studio-quality Mic Level Balanced DIRECT Output.
The ROSETTE DI Preamp and 2x8 Combo represent the new frontier in the MESA/Boogie’s amplifier bloodline. This tone-infused
powerhouse pedal is both compact and light-weight, yet built to go the distance with the features and control necessary to continue
the legacy that was started almost 50 years ago in that shack in the redwoods above Lagunitas, California. All MESA amplifiers and
products, like Rosette, are handcrafted in Petaluma, California using the Finest Materials from Around the World.
MID FREQ
1.8
300
KHZ
HZ
MID GAIN
5.0
KHZ
OUT LEVEL
PICKUP
INPUT
OUT
IN
PHASE
INPUT
TUNER
OUTPUT
ACOUSTIC DI-PREAMP
500
40
HZ
HZ
BOOST
LEVELS
MUTE BOOST
FILTERS
40
HZ
HI-PASS
200
HZ
150
HZ
BASS TREBLE PREAMP
LOW HIGHNOTCH
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TOP PANEL (CONTROLS & FEATURES)
OUT
IN
PHASE
INPUT
TUNER
OUTPUT
ACOUSTIC DI-PREAMP
40
HZ
BOOST
LEVELS
MUTE BOOST
FILTERS
500
HZ
40
HZ
HI-PASS
MID FREQ
1.8
150
KHZ
HZ
200
HZ
BASS TREBLE PREAMP
LOW HIGHNOTCH
MID GAIN
5.0
300
KHZ
HZ
OUT LEVEL
PICKUP
INPUT
INPUT JACK
This jack (located on the right side of the chassis) is the PICKUP INPUT that feeds the first stage monolithic J-FET
buffer amp of the ROSETTE™ DI-PREAMP. The input sensitivity of this input buffer amp is compatible with all common pickup levels
and impedances (input impedance is approx. 1M ohms). When a 1⁄4” (6.3mm) plug is inserted into the jack, the power is automatically
turned on, but please note that it is important for the 1⁄4” (6.3mm) plug to be of the TIP-SLEEVE type as TIP-RING-SLEEVE types
may not engage the power-on circuit properly. It is always good practice (and customary) to inform the FOH/monitor engineer that
you will be turning your DI on or off so as to prevent any pops or unexpected signal into their system(s).
TUNER OUTPUT JACK
This jack (located on the left side of the chassis) is the TUNER OUTPUT. This signal is fully
buffered and is not muted when the mute footswitch is engaged to allow for “silent” tuning without sending signal to the PA,
stage speakers or recording devices.
MUTE FOOTSWITCH
This footswitch mutes the audio signal being sent to the DIRECT OUTPUT, FX SEND and PREAMP
OUTPUT for silent tuning with a tuner connected to the TUNER OUTPUT jack, or just to mute a guitar at any time. There is a red
LED indicator that illuminates when the DI-PREAMP is in MUTE mode.
POWER LED
BOOST FOOTSWITCH
This blue LED indicates that the DI-PREAMP is connected to a power source and is switched on, operating correctly.
This footswitch engages the boost (or solo) function. The amount of boost is set by using the BOOST
control on the top of the DI-PREAMP. There is a green LED indicator that illuminates when the DI-PREAMP is in BOOST mode.
INPUT (GAIN)
This control determines the INPUT GAIN of the first gain stage in the Rosette DI Pre and, ultimately, sets the
level at which the following electronics stages operate. There is considerable headroom built into this stage to accommodate most
reasonable gain structures, though it is possible to overdrive the INPUT with some pickups by using extreme settings and/or an aggressive playing style. If this occurs, increase the MASTER volume control and decrease the INPUT control.
PHASE SWITCH
This switch sets the PHASE (or polarity) of the Rosette DI Pre to all outputs except the tuner output. Depending
on how your instrument’s pick-up/microphone is wired, it can be either in PHASE or out of PHASE (there is no way to tell by looking
at it). Under some conditions, if the signal from your instrument and the signal from the speaker are of the same polarity, feedback
can become an issue. Set this switch to the position that produces the minimum tendency for feedback before attempting to use the
HI-PASS, NOTCH FILTER or EQ for feedback issues.
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