Overview

Introducing the new Rosette™ Acoustic DI Preamplifier for home, studio or stage.

Introducing the Rosette™ DI Preamplifier, an acoustic instrument direct interface unit that puts accurate reproduction at the top of the list, but also offers comprehensive shaping power for enhancement when you might need it. The result of 48 years of definitive amp design and a focus to deliver the most accurate reproduction of your instrument’s acoustic sound possible in amplification.

Details

Front Panel

We start with the same front end and EQ circuitry used in our Rosette™ 300 Two:Eight Combo, less the mic input. Both products’ circuit design is derived from high end recording console design. This no-compromise approach ensures the purest signal path and lowest noise specs that guarantees detailed, rich musicality and unrivaled accuracy.

As you would expect on any pro console, both input gain and phase are determined by the INPUT control and PHASE switch. A wide range of high impedance pickups are handled easily with the optimized, current source-biased FET input stage. The phase relation between pickup output and whatever speakers are being driven can be addressed by flipping the PHASE switch on the Rosette DI for easy comparison to decrease or eliminate feedback or even improve your overall tone.

We have also included two additional sweep-able filters to assist with feedback elimination in live performance environment. NOTCH filter cuts a chosen frequency in a narrow band to remove resonant frequencies that cause feedback. This filter removes those frequencies as it is rotated clockwise. The HI-PASS filter cuts frequencies in the sub-harmonic range as it is turned clock-wise. This is very helpful in eliminating unwanted low frequency feedback on stage and tightening up the low-end for specific instruments or musical styles.

A footswitchable BOOST control is incorporated for increasing the level of certain musical sections like solos or in instances whereby a level increase is needed. The BOOST level sets the amount of boost when the it is engaged. Additionally, a footswitchable MUTE control is also included. This feature mutes the signal at the rear panel outputs but does not mute the side TUNER output, enabling you to employ silent tuning between songs.

The fully professional EQ Section incorporates fixed shelving BASS and TREBLE controls plus two semi-parametric MID bands covering LOW and HIGH midrange frequencies. These can overlap for finite control over adjacent midrange frequencies or one might be used to combat feedback while the other is applied for tone shaping duties.

Rear Panel

The first thing you’ll likely notice on the Rosette™ DI Rear Panel are the two XLR Balanced Outputs flanking the others, which are ¼” phono jacks. These allow the choice of capturing the straight sound of your instrument or the sound of the preamp’s effect on the source.

Both XLR Balanced and ¼” Phono PREAMP outputs are provided to capture the sound of the entire preamp for a feed to either the Stage’s Monitor Board, a Recording Console, power amp or powered Monitors for larger Stage rig applications. The XLR PREAMP Output is Balanced while the ¼” PREAMP Output is Unbalanced. Both of these Outputs are optimized for LINE Level.

An XLR Balanced DIRECT OUTPUT is provided that allows a choice of origination points for the signal, which is determined by the SOURCE switch. PRE, which captures the signal just after the INPUT buffer stage but before the GAIN control and 4-Band EQ, and POST, which captures the signal after the preamp and EQ section. Regardless of which location the signal is derived from, the OUTPUT will be MIC Level (-30dB -10dB). This Output is optimized for MIC Level Input applications making it the obvious choice for a feed to the Front Of House Console or for Recording scenarios where you might want an unaffected source for later shaping and/or processing.

Either of these OUTPUTS may be used for the most appropriate destination or they may both be used simultaneously for different destinations, the most common of these scenarios being the DIRECT Output feeding the Front Of House Console and the PREAMP Output feeding the Monitor Console for further reinforcement of your Stage sound.

Both Balanced OUTPUTS include GROUND LIFT switches that allow the lifting of PIN 1 on the XLR to help eliminate the possibility of different Ground references causing unwanted noise or hum.

A Series Effects Loop is provided for interfacing outboard processing and this appears as two ¼” phono jacks labeled SEND, where the signal is taken at the end of the preamp, and RETURN, where it is returned, buffered and passed on to the output stage and then to the MASTER. The Loop is likely best for time-based effects such as Chorus, Flange and Delay. Since fewer effects like overdrive, compression, envelope filters and wah are used with Acoustic Instruments, the need to put devices in front of the ROSETTE DI will likely be infrequent, but should you find yourself using these types of effects, place them there in the signal path.

The internal Battery can be bypassed to run the ROSETTE on standard voltage wall power. Simply connect the Power Supply to the jack and the internal battery will be disconnected automatically. However, the DI Preamp can be easily powered from any 9VDC power supply and draws less than 45mA so it’s very pedalboard friendly.

Specifications

• Made in Petaluma, California with the World’s Finest Materials.
• Solid-State Preamp featuring Phase Switch, Input Level Control, Boost Footswitch with Variable Boost Level Control.
• Separate Preamp Output Level Control (dedicated to the Line Level Preamp Outputs).
• 1 Channel / 1/4" Pickup Input (active or passive).
• Available EQ:
• Variable Notch Filter (40Hz to 500Hz).
• Variable Hi-Pass Filter (40Hz to 200Hz).
• Fully Active 4-Band EQ Controls (+/- 12dB of Bass, Low-Mid, High-Mid & Treble) with Sweepable (variable) Low-Mid (150Hz-1800Hz) & High-Mid (300Hz-5000Hz) Frequency Controls.
• FX Loop (for external FX).
• Footswitchable Boost (Solo) with Variable Boost Level Control.
• Tuner Output with Footswitchable Mute.
• Balanced XLR Mic Level (DI) Out with Pre/Post & Ground Lift Switches, Line Level Preamp Outputs controlled by the Preamp Output Level Control - Unbalanced & Balanced with Ground Lift Switch (drives any amp).
• AC or Battery Powered, auto-switches to battery if AC fails and battery is installed.
• All Aluminum Chassis.
• Slip Cover.

Weight and Dimensions

• 2 lbs (0.9 kg).
• (HxWxD): 2.2625" (57.5 mm) x 5.5" (139.7 mm) x 8.1875" (208 mm).