Mesa Boogie Rosette 2x8 Acoustic Combo Amp
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*Get your MESA BOOGIE Rosette Combo from Humbucker Music*
The Rosette is a dedicated acoustic instrument platform designed not just for acoustic guitars, but also for mandolin, ukulele, violin/fiddle, dulcimer, cello, upright bass and other uniquely acoustic instruments. Unlike electric guitar amplifiers that offer enhancements and/ or re-voicings, Mesa believed that there was no reason to “enhance” the sound of an acoustic instrument, but rather… simply reproduce it.
While staying true to the concept of Do No Harm, few products or companies seem to share this perspective for Acoustic Amplification. And when it comes to the electronic and mechanical components and design needed to fulfill that order, it’s easier said than done. It requires a commitment to using the absolute best components and circuit design dedicated to uncompromising accuracy, purity of sound and the lowest possible noise.
With the Rosette, Mesa has opted for architecture straight from high-end recording console designs. They 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, Mesa chose dedicated, time-tested designs, proven over decades of great recordings, to deliver the uncompromised, accurate truth.
In the MIC Input of Channel 1, a rugged, professional XLR jack uses a dual discrete transistor pair for the trans-conductance Input stage. Because microphones are low impedance transducers, the noise current specification must be at the top of the design list for the best noise performance and Tone.
Channels 1 and 2 feature duplicate ¼” mono PICKUP Inputs with input stage circuitry optimized for the impedance requirements of today’s (and yesterday’s) popular acoustic guitar pickups. A current source biased FET input stage was selected for this application as high impedance transducers require the noise voltage specification be the first consideration for optimal performance and Tone.
This purpose-built, no-compromise approach to the connection of your instrument pickup to the Input stage of the amp clearly states the mission with the Rosette Series. While it may look different from the crowded field of less sophisticated offerings in the marketplace, it is by far the proper and professional way to get the absolute best from the all-important instrument/pickup/amp input connection. Tone begins, and can end, at the Input Stage.
MUTE and PHASE switches accompany each channel’s Input features. Channel 1’s Input options are selected by the MIC/LINE switch, which determines the Input architecture.
GAIN adjusts the input gain level for each channel and the FX SEND determines the amount of that signal to be routed to the internal Effects Processor or the SEND of the EXTERNAL EFFECTS LOOP.
The HI-PASS Filter reduces or eliminates low-end feedback and tone issues before they can arise or be exacerbated with unintentional overuse of the EQ section. HI-PASS allows you to dial out the over-resonant, tubby frequencies that often create unwanted feedback, especially in bigger, more resonant guitars and acoustic instruments.
The fully professional 4-Band EQ Section provides the same degree of shaping power found in upscale recording or live sound consoles and together with the optimized INPUT circuitry, creates two impressive Channel Strips for amplifying acoustic instruments. The separate LOW and HIGH semi-parametric MID Bands allow specific control over a wide range of frequencies and can easily overlap if needed. This professional level Tone and Frequency control places the Rosette in a category beyond standard acoustic amps and in with the best of high-end Pro Audio gear.
Mini LED Indicators in the upper right corner of the Front Panel alert you to: 1) clipping the power section and the LIMIT circuit is being activated (YELLOW). 2) the amp overheating due to excessive Output or settings for prolonged periods (RED). 3) the amp’s Pilot light indicating the AC MAINS Power has been switched on (BLUE).
The on-board Effects Suite includes three effects choices: ROOM REVERB, HALL REVERB and REVERB AND CHORUS. These effects programs create many ways to add spatial enhancement to the sound of your instrument while the PARAMETER Controls provide unique adjustment of specific effect functions in each of the three modes. The FX MASTER control determines the overall mix of the effects to the dry signal to achieve the desired dry/wet blend.
Finally, The MASTER control at the far right bottom of the Front Panel provides volume adjustment of the amplifier and controls the overall output from the 300 watt power section that drives the Rosette’s two 8” custom neodymium speakers.
The Rosette 2x8 Combo utilizes a single SPEAKER OUTPUT to ensure the maximum 300 watt output power is provided via the optimized internal 4 Ohm speaker load..
A Headphone Output is provided for personal monitoring, with or without the combo speakers connected. If you wish to play with headphones ONLY (not using the Rosette’s internal speakers), simply unplug the Speaker Cord from the SPEAKER OUTPUT jack. Operating the Rosette’s Class D amplifier without its speakers connected is 100% safe and allows you to play through and/or record silently with the amp with headphones (or the amp’s DI Outputs – or both). The HEADPHONE OUTPUT will efficiently drive any headphones with an impedance between 8 to 32 Ohms. We suggest researching and auditioning headphones before you buy as the performance can vary substantially between manufacturers and impedances.
A Channel MUTE FTSW Jack is provided to allow remotely controlled muting of the Channels. The MUTE FTSW Input is fitted with a stereo (Tip / Ring / Sleeve) jack with the Tip controlling Channel 1 MUTE and the Ring controlling Channel 2 MUTE. MESA sells Rosette specific Mute footswitches separately through our Authorized Dealers and Distributors, our Parts & Accessories Online Store, or by contacting our Customer Service department.
Next up are the FX LOOP SEND & RETURN Jacks. These mono jacks are provided as a Parallel Loop interface for connecting external effects processors and pedal effects between the amp’s preamp and power section. Both the SEND (Output) and RETURN (Input) are optimized for a Line Level signal, so external processors should have their Input and Output configured for the same signal level whenever possible. The FX SEND level is controlled by each channel’s Front Panel FX SEND control. The FX SEND can also be used as an additional ¼” Line Level Output when nothing is connected to the FX RETURN Jack.
The AUX INPUT is provided to allow connection of external music sources through your Rosette amplifier such as a CD player, mobile device, drum machine, and computers or DAWs used for audio playback and accompaniment. Use the device’s volume control to achieve its desired listening level in balance with your instrument as all controls except the MASTER are inactive in this signal path.
Finally, the Rosette features a comprehensive, studio-quality DIRECT OUTPUT Section. Channel 1 & 2 have dedicated XLR Outputs with PRE/POST EQ, MIC or LINE LEVEL and GROUND or PIN 1 LIFT switches. Additionally, a third XLR Jack, with Ground or Pin 1 Lift Switch, delivers a properly summed output of both channels preset to POST EQ & POST FX and switchable between MIC & LINE level.
Weight & Dimensions: 12.25" H, 18" W, 13.25" D 30lbs