SPM412e Stereo Preamp/Mixer Operation Manual Biamp Systems, 10074 S.W. Arctic Drive, Beaverton, Oregon 97005 U.S.A. (503) 641-7287 www.biamp.
blank 19Mar07
SPM412e INTRODUCTION TABLE OF CONTENTS Front Panel Features pg. 2 Rear Panel Features pg. 3 Modifications pg. 4 & 5 Remote Control pg. 6 & 7 Applications pgs. 8 & 9 Block Diagram pg. 10 Specifications pg. 11 Warranty The SPM412e Stereo Preamp/Mixer provides four stereo line inputs, one mic/line input, and two independent outputs.
FRONT PANEL FEATURES channel select down mute up min main level max SPM412e mic level (1) 1 3 2 (2) 4 bass treble balance zone level (3) (4) (5) (6) (7) (7) Main Level: These three momentary push-buttons adjust the overall level of signals sent to the Main Output (see Main Output on pg. 3). The Down push-button decreases level and the Up push-button increases level.
REAR PANEL FEATURES BIAMP SYSTEMS designed and assembled in the USA www.biamp.
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). Modifications are at the center of the circuit board, starting from the left side (see diagrams below). Modifications require no soldering.
MODIFICATIONS MIC PRE/POST VCA: Internal jumpers are provided to assign Mic/Line Input signal to the Main Output pre or post VCA (Main Level). From the factory, Mic/Line Input signal is assigned pre-VCA (affected by Main Level). To assign Mic/Line Input signal post-VCA (not affected by Main Level), move jumpers P10 & P11 (‘L’ & ‘R’) backward one pin to the ‘POST’ position, using needle-nose pliers. These jumpers are totally independent of each other.
REMOTE CONTROL Infrared and wall-mount remote control is optional for the SPM412e. Remote control affects Channel Select and Main Level (plus mute). Remote control may be added at any time, and does not require the SPM412e to be modified, opened, or removed from a rack. There are two remote control devices: a hand-held Infrared Transmitter and a wall-mount push-button Controller with status indicators & infrared detector (see diagrams below).
REMOTE CONTROL Translator: When the adjacent switch is depressed, the ‘hi’, ‘lo’, & ‘gnd’ terminals on the SPM412e rear panel Remote connector provide a ‘Translator’ input, which allows third-party controllers (such as AMX®, CRESTRON®, and RANGERTM) to directly interface to, and control, the SPM412e.
APPLICATIONS Restaurant/Lounge SPM412e main BIAMP SYSTEMS designed and assembled in the USA www.biamp.
APPLICATIONS Boardroom SPM412e main BIAMP SYSTEMS designed and assembled in the USA www.biamp.
BLOCK DIAGRAM Zone Level L Σ 1 Mute R Tone Defeat 2 Mute Mic Σ R Switch Matrix ▼ Mono/ Stereo Σ L STEREO LINE INPUTS 1~4 + - Mic + - VCA Mic Treble & Bass Mic Bal + - VCA ▼ L Σ 3 R Limit L 4 R Threshold Level Control Logic 1 2 3 4 up GND translator mute IR2 / high down Channel Select Logic IR3 / low REMOTE Min Main Level Reference Meter Max +24V Phantom Power +10 Trim MIC/LINE INPUT + - 30dB Pad Mic/Line Preamp ▼ signal present ▼ mute ▼ Mic Level Signal
SPECIFICATIONS Frequency Response (20Hz-20kHz @ +4dBu): +0/-0.5dB Total Harmonic Distortion (20Hz-20kHz @ +4dBu): < 0.1% Output Noise (20Hz-20kHz @ nominal levels): < -85dBu Equivalent Input Noise (20Hz-20kHz, 150Ω termination @ Mic/Line Input): Maximum Gain (Mic/Line Input to Main Output): < -125dBu 80dB Input Trim Gain Range: Mic/Line Input (30dB Pad out) +60dB to +20dB Stereo Line Inputs 1~4 +10dB to -50dB Input Impedance: Mic/Line Input (balanced) 1.
WARRANTY BIAMP SYSTEMS IS PLEASED TO EXTEND THE FOLLOWING 5-YEAR LIMITED WARRANTY TO THE ORIGINAL PURCHASER OF THE PROFESSIONAL SOUND EQUIPMENT DESCRIBED IN THIS MANUAL 1. BIAMP Systems warrants to the original purchaser of new products that the product will be free from defects in material and workmanship for a period of 5 YEARS from the date of purchase from an authorized BIAMP Systems dealer, subject to the terms and conditions set forth below. 2.
