User manual SUMMIT 2BA-221

[. . . ] Use more of this control for a cleaner, less vacuum tube sound. Adjust this control along with the Tube Output gain to get the proper output level and to get the desired sound. Signal LEDs · Green - - Signal is present at the input. · Amber - Proper input signal level. · Red - - - Signal is at the threshold of Clipping. [. . . ] Phantom power is present whenever the blue LED is illuminated. Turn the unit off to bleed off the voltage. Warning: Some microphones cannot tolerate phantom power and may be damaged. Check the microphone's specifications and requirements before using phantom power. Highpass Filter Frequency Control This control adjusts the frequency of the highpass filter from 20Hz to 200Hz. The highpass filter is used to remove low frequency rumble from the mic input. Important - Please Read! The 2BA-221 contains a vacuum tube which generates heat. Do not block the cooling holes on the top of the 2BA-221 and always allow adequate ventilation when mounting the unit in a rack enclosure. 6 Summit Audio, Inc. Rear Panel Rear Panel MODEL 2BA-221 20W MAX OUTPUTS STACK SUMMIT AUDIO INC. CARMEL, CA USA INPUTS FUSE IN SUMMITAUDIO. COM OUT +4 BAL. -10 BAL. INSERT IN MIC A. C. Receptacle The 2BA-221 is factory wired for either 100, 115 or 230 Volts AC. Before connecting AC power make sure the 2BA-221 is wired for the voltage used in your country. +4 Balanced Output This is a balanced, low impedance XLR output connection compatible with professional recording and audio equipment. Note: You can use all inputs and outputs at the same time for versatility. 1/4" TRS Balanced Line Level Output This is a -10dB, balanced 1/4" output designed to interface with your recording device, compressor or EQ. XLR Mic Level Input This is a balanced low level input designed for microphones. The gain of this channel is adjusted using the front panel Mic Gain control and the -20 dB Pad switch. 1/4" Line Level Input This is a 10K Ohm impedance, balanced line level input controlled by the front panel Line/Hi-Z Input Gain control. Model 2BA-221 Microphone Preamplifier 7 Rear Panel 2BA-221 Signal Out Signal Return Insert The insert jack allows you to insert a processing device, such as a compressor, after the highpass filter and before the vacuum tube stage. This jack can also be used as another input or output. Refer to the block diagram on page 14. Tip To Input of Processor Ring To Output of Processor Stacking Output This is an unbalanced high level output taken just before the vacuum tube input and insert. Connect the Stacking Output to the Stacking Input of another 2BA-221 to add additional input channels. This jack can also be used as an additional output (phase inverted from input). INSERT CABLE Signal is sent out on tip of plug and returned via ring of plug. When using the insert jack, a cable wired like the one shown above should be used. Stacking Input This is an unbalanced high level input which sums into the 2BA-221 just before the tube output stage and insert jack. From Stack Out of another 2BA221 2 Inputs SUMMIT AUDIO INC. CARMEL, CA USA OUTPUTS INPUTS 2BA-221 MODEL 2BA-221 20W MAX STACK The diagram at right shows one way to connect two 2BA-221 units to create a 4-input summing device. The Hi-Z input on the front panel could be used instead of the rear panel line-in jack if desired. FUSE IN SUMMITAUDIO. COM OUT +4 BAL. -10 BAL. INSERT IN MIC 2BA-221 MODEL 2BA-221 20W MAX OUTPUTS STACK SUMMIT AUDIO INC. CARMEL, CA USA INPUTS FUSE IN SUMMITAUDIO. COM OUT +4 BAL. -10 BAL. INSERT IN MIC 2 Inputs Output 8 Summit Audio, Inc. Basic Operation Basic Operation Just Plug-in & Go 1. Plug your favorite microphone into the rear panel Mic Input jack, plug your instrument into the front panel Hi-Z Input, or your line level device such as a CD player into the rear panel Line Input jack. Connect either the rear panel XLR or 1/4" Output to the input of your mixer or recorder. (Both outputs are balanced. ) Adjust the Mic and Line/Hi Z Level Gain control so that the amber LED is lit most of the time and the red LED only lights occasionally. Adjust the Tube Output Level for an optimal signal level. Adjust the front panel Mic Impedance control to match your microphone. If in doubt, set the control for 10K ohms. [. . . ] -10 UNBAL. Output Input 12 Summit Audio, Inc. Applications Using the 2BA-221 as an Instrument Preamp The 2BA-221 makes a great instrument preamp for guitars, basses, keyboards or whatever. In addition to the +4 Main Balanced Output, the Stacking Output and the -10 Main Output can be used to send the signal to the board, your amp or a headphone monitor amp. Turn up the Tube Output control for more tube sound, use the Solid State input gain for a cleaner sound. To distort the 2BA-221, turn the Tube Output up to 2-3 o'clock and adjust the solid state Hi-Z input gain to get a good level. [. . . ]