Back Panel, Inputs B/A, Voicing Switches | Mesa/Boogie 2:90 instruction

BACK PANEL

Now that we've mastered the Front Panel and found its simple layout easily digested let's move aft for some jacks and tubes. Let's take the connections first and start with the jack panel.

INPUTS B/A:

Here in the upper left corner of the jack panel you'll find two 1/4” insulated jacks. These are the inputs for pre-amps and/or effects, depending on how you wire your system. You may drive the 2:90 with your pre-amp directly or choose to come from the last effect in a chain and drive the power amp this way. Either way is fine and up to your preference.

We have also provided an input sensitivity switch that toggles you between instrument level and the less sensitive line level position. If you have too much signal in your system by the time you get to the 2:90, use Line Level. This tends to be the more common position. If your Pre-amp doesn't have enough send level or you want to plug a guitar straight into the 2:90 use Instrument Level. Yes... you did hear right, you can plug right into the 2:90 with a good guitar and get a sweet clean rhythm sound. Crank the level all the way up and check out a vintage solo sound. Use the voicing features in this setup and you just may find yourself wondering what you need a pre-amp for! Seriously though, the 2:90 all by itself could and has been used as a stand alone guitar amp. Try that with your standard solid state power amp!

VOICING SWITCHES

As mentioned in the Front Panel section; these are the 1/4” jacks that trigger the 2:90's three voicing features. They are described earlier under Deep, Half-Drive and Modern. Again, they are activated with a "tip to ground" or "collector to ground" type switch. TriAxis owners find these jacks especially useful, as they can trigger any or all of these features with the on board function switches and store these settings under a program number. If you don't own a TriAxis... order one... now, or use any "tip to ground" on/off switch. Shielded cable need not be used.

SPEAKERS

These six jacks deliver the 2:90's incredible tone to your favorite speaker cabinets. One eight ohm and two four ohm jacks per channel are provided. Use one eight ohm cabinet in the eight ohm jack. Use two eight ohm cabinets into the two four ohm jacks. Use one four ohm cabinet into one four ohm jack. Use one sixteen ohm cabinet into the eight ohm jack. Two sixteen ohm cabinets into a "y" cable works even better in the eight ohm jack. This should cover most all the popular speaker configurations. Don't forget: Duplicate the proper load for both channels: Turn it’s Level control to zero and its Presence control all the way up. It's also best not to send signal to the unused channel input.

2:90 specifications

The Mesa/Boogie 2:90 power amplifier is a revered piece of equipment in the world of guitar amplification, known for its exceptional sound quality, robust construction, and versatile features. This powerhouse is designed with a distinct capability to enhance both studio recordings and live performances, making it a popular choice among professional musicians and tone enthusiasts alike.

One of the defining characteristics of the Mesa/Boogie 2:90 is its Class A/B power design, which affords a unique blend of power, warmth, and clarity. The amplifier delivers 90 watts per channel, providing ample headroom while maintaining exceptional tonal fidelity. This robust output allows it to handle high volume levels without sacrificing sound quality, making it ideal for both small venues and large stages.

The 2:90 features dual EL84 power tubes that impart a rich harmonic character, ensuring that players receive a full-bodied sound with impressive dynamic range. The use of these tubes is instrumental in producing the warm, vintage-like tones that musicians crave, while the overall design ensures that the amplifier reacts responsively to the guitarist’s playing style.

Another key feature of the Mesa/Boogie 2:90 is its dual-channel architecture, which allows for a wide range of tonal possibilities. Each channel can be tailored to different musical styles, offering controls for gain, treble, midrange, and bass, which provide users with the ability to sculpt their sound precisely. Additionally, the amp includes a “presence” knob that further enhances the high frequencies, adding clarity and sparkle to the tone.

The reliability of the amplifier is bolstered by its rugged construction. Built into a durable chassis, the 2:90 is designed to withstand the rigors of touring and frequent use. The internal cooling system ensures optimal performance, preventing overheating even under the most demanding conditions.

In conclusion, the Mesa/Boogie 2:90 power amplifier stands out as a versatile and powerful option for guitarists seeking top-notch sound quality and reliability. With its Class A/B design, dynamic tube-driven character, dual-channel flexibility, and rugged build, it remains an enduring favorite in the music industry. Whether in the studio or on stage, the 2:90 is capable of delivering a rich and dynamic audio experience that meets the demanding needs of today’s musicians.