User manual BIAMP SPM412E

[. . . ] SPM412e Stereo Preamp/Mixer Operation Manual Biamp Systems | 9300 S. W. Gemini Drive | Beaverton, OR | 97008 | USA | +1. 503. 641. 7287 | www. biamp. com TABLE OF CONTENTS bla Front Panel Features Rear Panel Features Modifications Remote Control Applications Block Diagram Specifications Warranty pg. 11 nk Aug 09 SPM412e INTRODUCTION The SPM412e Stereo Preamp/Mixer provides four stereo line inputs, one mic/line input, and two independent outputs. With input source selection, automatic page-over muting, and remote control functions, the SPM412e is ideally suited for applications such as restaurants, bars, meeting rooms, aerobics studios, and school gymnasiums. [. . . ] (10) Pad: When depressed, this switch reduces the Mic/Line Input signal level by 30dB (see Mic/Line Input above). Use this switch when Mic/Line Input signal levels exceed the normal operating range of the Trim control, or whenever a line-level input signal is connected. (11) Trim: This screwdriver adjustable control sets gain at the Mic/Line Input (see Mic/Line Input above). For best performance, adjust Trim so the adjacent +10 indicator flashes only on occasional peaks in signal level. (12) Phantom Power: When depressed, this switch provides +24 Volt Phantom Power to the Mic/Line Input (see Mic/Line Input above). CAUTION: Never turn Phantom Power on when line-level signal devices are connected to the Mic/Line Input. Always turn power off and Mic Level down before switching Phantom Power or making connections to the Mic/Line Input. 3 MODIFICATIONS To access internal modifications, first disconnect power to the unit. Then lay the unit on a flat surface with the front panel facing forward and the top panel facing up. Remove the top panel (eight screws along the sides and rear; one screw centered behind the front panel). MUTE ASSIGN: Internal jumpers are provided to assign muting of Stereo Line Input signals at the Main Output and the Zone Output, independently. From the factory, muting is assigned to both the Main Output and the Zone Output. To un-assign muting from the Main Output, move jumpers P5 & P7 (`LEFT INPUT MUTING' & `RIGHT INPUT MUTING') forward one pin to the `OFF' position, using needlenose pliers. If desired, muting may be un-assigned from left & right Main Outputs independently. To un-assign muting from the Zone Output, move jumper P9 (`STEREO TO ZONE MUTING') forward one pin to the `OFF' position, using needle-nose pliers. If desired, muting may be un-assigned from both the Main Output and the Zone Output. NOTE: Mic/Line Assign, Stereo Input Assign, and Mute Assign are totally independent of each other. Therefore, Mic/Line Input signal may be un-assigned from either output, without un-assigning the muting function from that output. Likewise, the muting function may be unassigned from either output, without un-assigning Mic/Line Input signal from that output. To un-assign both Mic/Line Input signal and the muting function from a given output, both jumpers must be moved. Also, Mic/Line Input signal may be un-assigned from the Main Output and Stereo Line Input signal may be un-assigned from the Zone Output, creating separate outputs for Stereo Line Input and mono Mic/Line Input signals. This is useful when separate high-fidelity (music) and distributed (speech) speaker systems are desired. MUTE ADJUST: Internal screwdriver adjustable controls are provided to adjust the amount of muting applied to Stereo Line Input signals. [. . . ] Connect a wire across the `Mute' & `Signal Present' terminals for voice-activated muting. 4) Connect the stereo line-level program sources to Inputs 1~4, and adjust Level 1~4 (reduce level only on inputs which are higher than the others). 5) Adjust Main Level, Zone Level, and Limit Threshold for desired maximum levels. Set Trim & Pad so the +10 indicator flashes only on occasional peaks. Mount the Controller in a suitable location. 8 BLOCK DIAGRAM Zone Level L 1 R Mute Mute Mic Tone Defeat Mono/ Stereo Mic Treble & Bass Mic VCA VCA Mic Bal + t ZONE OUTPUT L 2 R STEREO LINE INPUTS 1~4 3 R Switch Matrix L + t L MAIN OUTPUT R + t L 4 R Limit Threshold IR3 / low REMOTE IR2 / high GND translator +24V Phantom Power +10 1 Channel Select Logic Level Control Logic down mute 2 3 4 Min Main Level Reference Meter up Max Trim MIC/LINE INPUT + t 30dB Pad Mic/Line Preamp Mic Level Signal Present Mute Logic signal present t mute SPM412e Block Diagram 9 SPECIFICATIONS Frequency Response (20Hz-20kHz @ +4dBu): Total Harmonic Distortion (20Hz-20kHz @ +4dBu): Output Noise (20Hz-20kHz @ nominal levels): Equivalent Input Noise (20Hz-20kHz, 150 termination @ Mic/Line Input): Maximum Gain (Mic/Line Input to Main Output): Input Trim Gain Range: Mic/Line Input (30dB Pad out) Stereo Line Inputs 1~4 Input Impedance: Mic/Line Input (balanced) Stereo Line Inputs 1~4 (unbalanced) Maximum Input: Mic/Line Input (balanced) Stereo Line Inputs 1~4 (unbalanced) Output Impedance: Main Output (balanced) Zone Output (balanced) Maximum Output: Main Output (balanced) Zone Output (balanced) Phantom Power (Mic/Line Input only): Power Consumption: Power Requirements: Dimensions: Height (1 rack space) Width Depth Weight: +0/-0. 5dB < 0. 1% < -85dBu < -125dBu 80dB +60dB to +20dB +10dB to -50dB 1. 7k ohms 7k ohms +27dBu +27dBu 200 ohms 200 ohms +24dBu +24dBu +24 Volts DC < 13 watts 115/230VAC 50/60Hz 1. 75 inches (44mm) 19 inches (483mm) 7. 25 inches (178mm) 6 lbs. 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