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manual abstract
Figure 1 shows the layout of the front and rear panels. Input channels 1-10 are designed to either be used as low-Z balance microphone or line level inputs. The combination connector on inputs 1-10 permits use of either XLR or .” input connectors. The block diagram shown in Figure 2 outlines the signal flow for the MA-1206. A signal appearing at either input 1 will automatically mute the other channels unless the mute function is defeated via a switch on the rear panel. Inputs 11 and 12 are for auxiliary line-level sources such as tape or CD players. Mono or stereo signals may be applied to inputs 11 or 12. The left and right components of a stereo signal can be applied to the dual RCA phono jacks of these inputs and mixed together to drive the built- in monaural power amplifier. A rear panel paging input with gain control is provided for the paging output of a telephone system. An audio signal appearing at this input automatically mutes all other inputs. A preamplifier output jack and power amplifier input jack permit the mixed output to be fed to an external signal processor (graphic EQ or compressor), and then returned to the built-in amplifier. The preamp output may be used to drive an additional power amp with its own set of speakers without interrupting the function of the built-in amplifier. There is also a 24v dc power option to operate the unit off of a 24v emergency power source. The speaker output is available at a barrier strip, which includes terminals for driving low impedance loudspeaker loads, as well as 25, 70.7 or 100 volt distributed systems. Architects’ and Engineers’ Specifications: The mixer amplifier shall have twelve input channels, with individual mix gain controls. Input channels 1 through 10 shall be configured for either low-Z balanced microphone operation or hi-Z line level signals via switches on the rear panel. A signal present channel 1 shall trigger the muting of channels 2-12. The mute circuit shall be defeatable using a switch on the rear panel. Inputs 1 - 10 shall be available via combination female XLR / .” connectors. Inputs 11 and 12 shall accept either monaural or stereo sources. If a stereo source is connected, it shall be properly mixed to mono via a resistor network mounted on the input plate. There shall be a paging input that accepts a 600-ohm line- level feed from a phone system. When a signal is present at the paging input, it shall automatically mute other input sources. The paging input shall be equipped with its own gain control. There shall be a master level control. Separate bass and treble equalization controls shall be provided. The mixer amplifier shall meet the following performance criteria: output power shall be 60 watts; total harmonic distortion shall be less than 1% at 1 kHz; frequency response shall be within ±3 dB from 50 Hz to 15 kHz; input impedance shall be 600ohms (balanced inputs) or 47 kW (unbalanced inputs); nominal load impedance shall be 4-, 8- or 16-ohms for voicecoil- connected loudspeakers, 25, 70.7 or 100-volt nominal transformer windings for the constant-voltage output. In addition to a preamplifier output/power amplifier input link, there shall also be a line-level balanced XLR output. The mixer amplifier shall operate from either a standard 120 V ac 50/60 Hz or a 24V dc power source , and measure 13.3 cm (5.2 in.) high x 48.0 cm (18.9 in.) wide x 32.0 cm (12.6 in.) deep. The net weight shall be 9.0 kg (19.8 lb). The mixer amplifier shall be the Electro-Voice ® Model MA-1206. Technical Specifications: Power Output (at 1 kHz): 60 Watts Frequency Response: 50 Hz -15 kHz, ±3 dB Input Sensitivity/Impedance, Inputs 1-10 Mic setting: 0.3 mV/600 ohm (balanced) Inputs 1-10 Line setting: 75 mV/47kohm (balanced) Paging: -20 dBm/600 ohm (transformer isolated) Power Amp In: 1 V/10 kohm (unbalanced) Aux: 100 mV to 1V/ (unbalanced) THD (at rated output): <1% at 1 kHz Signal-to-Noise Ratio, Mic : >52 dB Aux: > 65 dB Paging: > 65 dB Power Amp In: >90 dB Line Output Level/Impedance, Preamp Output: 1 V/1 kohm (unbalanced) Balanced Line Output: 500 mV/47 kohm (unbalanced) Speaker Outputs: 4, 8, 16 ohm, 25, 70.7 and 100-Volt Tone Controls, Bass: +-10 dB at 100 Hz Treble: +-10 dB at 10 kHz Muting: 40 dB attenuation Protection : 3 independent Slo-Blo ® fuses, primary ac and dc Power Dissipation: 250 watts Power Supply: 108-132 V ac, 50/60 Hz Dimensions, Height: 13.3 cm (5.2 in.) Width: 48.0 cm (18.9 in.) Depth: 32.0 cm (12.6 in.) Net Weight: 9.0 kg (19.8 lb) Shipping Weight: 9.7 kg (20.4 lb) Rear View 12000 Portland Avenue South, Burnsville, MN 55337 Phone:952/884-4051, Fax:952/884-0043 © Telex Communications, Inc. 4/2002 Part Number 38110-137 Rev A U.S.A. and Canada only. For customer orders, contact Customer Service at: 800/392-3497 Fax: 800/955-6831 Europe, Africa, and Middle East only. For customer orders, contact Customer Service at: + 49 9421-706 0 Fax: + 49 9421-706 265 Other International locations. For customer orders, con...