SPM412e Stereo Preamp/Mixer Operation Manual Biamp Systems | 9300 S.W. Gemini Drive | Beaverton, OR | 97008 | USA | +1.503.641.7287 | www.biamp.
TABLE OF CONTENTS bla Front Panel Features pg. 2 Rear Panel Features pg. 3 Modifications pgs. 4 & 5 Remote Control pg. 6 Applications pgs. 7 & 8 Block Diagram pg. 9 Specifications pg. 10 Warranty pg.
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. The SPM412e is extremely versatile, yet cost-effective, and is easy to install and operate.
FRONT PANEL FEATURES (1) (2) (3) (4) (1) Mic Level: This rotary control adjusts the level of the Mic Input signal sent to the Main Output and Zone Output sections. Mic Input signal can be assigned to the Main and/or Zone Outputs individually, plus it can be assigned to the Main Output as pre/post Tone and pre/post Main Level (see Modifications on pgs. 4 & 5).
REAR PANEL FEATURES (1) (2) (3) (4) (5) (6) (7) (8) (1) DC Power Supply: The included power supply module provides 24 Volt DC power to the mixer. It is connected to the DC Power Jack on the rear side of the mixer. To ensure compatibility, only use a Biamp Systems’ supplied power supply. (9) (10) (11) (12) (8) Inputs 1~4: These RCA connectors provide the unbalanced Stereo Line Inputs for line-level signals (-10dBu or +4dBu).
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 An optional wall-mount push-button Controller with status indicators (see diagram below) is available 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. Remote control of the SPM412e is also possible via third-party controllers, which utilize a carrier-stripped serial bit-stream (see Translator on next page).
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 + - VCA Mic Treble & Bass Mic Bal t Σ 3 R Limit 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 +24V Phantom Power +10 Trim MIC/LINE INPUT + - 30dB Pad Mic/Line Preamp Mic Level t signal present Signal Present SPM412e Block Diagram t mute t + - VCA L L Mute Logic 9 ZONE OUTPUT
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.
DoC SPM201003 EC Declaration of Conformity Biamp Systems Corporation, as manufacturer having sole responsibility, hereby declares that the following described product complies with the applicable provisions of the DIRECTIVES below except as noted herein. Any alterations to the product not agreed upon and directed by Biamp Systems Corporation will invalidate this declaration.
