Mesa/Boogie 2:90 manual Back Panel, Inputs B/A, Voicing Switches, Speakers

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.

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