• • • • • • • Eliminate Long Mic Level Runs and Splitters Eliminate Loading Effects on Microphones Audiophile Quality Preamplifiers MicLim™ - Mic Level Limiter Prevents Mic Preamp Overload Two Analog Outputs per channel Three Simultaneous Digital Outputs - Up to 96kHz Sampling Rate Up to 16 Units (128 channels) can be controlled via one control line T HE A PHEX R EMOTE C ONTROLLED M ICROPHONE P REAMPLIFIER SYSTEM Why Place the Preamps Near the Mic? THE PROBLEM THE SOLUTION Long mic level lines, mic splitters, and multiple inputs reduce the sensitivity of the microphone and change its frequency, phase and transient response. This performance degradation is the result of shifts in impedance, capacitance, and inductance values and is quite audible. • By placing the 1788A close to the mics and controlling it • • remotely the need for long mic level runs is eliminated. The noise picked up by long cable runs is no longer boosted at the end of the lines since the preamp gain has already been taken at the input of the line. By providing 5 outputs (3 digital & 2 analog) that are usable simultaneously the need for mic splitter boxes is eliminated. Typical set-up for the 1788A in a Live Sound Application STAGE AREA Monitor Mix AUX OUT AUDIENCE FOH MIX CONTROL/METERING SNAKE MAIN OUT 1788RC Remote Controller MIDI Controller PC Model 1788A Front of House Mixer Up to 16 1788As via one control line MICS To Recording Truck, Broadcast Feed, etc. TASCAM Format ADAT Format AES/EBU Format KEY Digital Outs Line Level Mic Level Control Line Why Remote Control? Almost all live applications require the monitoring of mic preamp gain. If there isn’t an engineer sitting next to the preamps on stage, there must be a way to control them from a remote position. All parameters of the 1788A are remotely or locally controllable. Also, setup, snapshots and recall of presets are quickly and easily available. The remote control protocol for the 1788A is MIDI and up to 16 units (128 channels) can be controlled with only one control line. 1788RC Power Supply & I/O Box There are three ways to control the 1788A remotely: 1) Via the 1788RC - hardware remote controller 2) Via PC or Mac running the 1788SW controller software (Win 95/98/2000/XP® or Mac OS X® compatible) 3) Via any device that generates MIDI, such as a MIDI controller, mixer, sequencer or show control system Audio Quality The 1788A provides 8 balanced Jensen® transformer-coupled microphone preamplifier inputs which offer audiophile sound quality far in excess of the mic preamps used in most mixing consoles. It also provides two separately trimmable analog outputs for each channel. The optional digital output module allows simultaneous output of 24 bit AES/EBU, T/DIF® and ADAT® Optical. 1788RC Remote Controller These A/D converters are selectable up to 96kHz and are Aphex proprietary “Drift Stabilized” (patented) which eliminate the need for high pass filtering in the digital domain. Because the inputs to the A/D converters are trimmed exactly to the outputs of the preamp, digital resolution can be maximized without fear of crashing. This makes the 1788A the perfect front end to any DAW, fiber system or digital console. Aphex Proprietary Technologies MicLim™ is a patented limiter circuit on the mic output a mic level limiter that speeds setup and makes the 1788A virtually crash-proof. MicLim allows you to set gain for maximum noise performance without having to back off for headroom, and eliminates the need for constant gain riding. Plus fiber or digital systems can be driven at levels that yield maximum resolution without fear of overload. LeNA™, the digitally controlled Low Noise Amplifier, allows the 1788A’s input gain to be adjusted remotely without noise or glitches. This patented Aphex circuit changes level in 1/4dB steps with 1dB stops. Other remote controlled preamps use relay switching with step sizes as high as 10dB. Even a step size of 1/4dB without LeNA will cause an audible click or pop that at high gains could be explosive! 1788SW Software for PCs 1788A Rear Panel Specifications Audio Specifications Frequency response: + .2dB 19Hz-20kHz Noise: -125dBu EIN THD + N: .003% @ +4dBu Out SMPTE IMD: <.02% DIM: <.005% Crosstalk: <-96dB Microphone Inputs Connector: 8 x 3-pin XLR female Type: Jensen® transformer coupled Impedance: Balanced, 1.6KΩΩ Max. input level: +27dBu (with 26dB pad engaged) CMRR: Better than -99dB @ 60Hz, -72dB @10kHz Phantom power: 48VDC on pins 2 & 3 Analog Outputs Connector: Main: 8 x XLR, Aux: DB-25 (TASCAM) Type: Main: Servo-balanced, Aux: Balanced Impedance: Balanced, 65ΩΩ Max. output level: +27dBu Digital Outputs (optional) Connector: AES/EBU: DB-15 male ADAT Optical: TOSLINK T/DIF: DB-25 Type: Drift stabilized 24 bit Impedance: 110ΩΩ (AES/EBU) Clock: 44.1, 48 or 96kHz Internal (or External) Clock connector: BNC Test tone: 700Hz 0dBfs, -20dBfs Headphones Connector: TRS jack Impedance: 8-600ΩΩ recommended load impedance Remote Control 1788RC Hardware Remote: Full remote control functions, Full metering and preamp status, Select one of 16 units, Create, Save,Edit, Recall up to 60 presets 1788SW Software: (For Windows 95/98/2000/XP® & Mac OS X®) Full remote control functions, Full metering and preamp status, Select one of 16 units, Create, Save,Edit, Recall up to 60 presets, Assignable up to 20 scenes MIDI Controller: MIDI command protocol available for full remote control, metering and status Connection: Remote to 1788: Ethernet, MIDI Unit to Unit Linking: Ethernet Hub Remote functions: Input Gain, Main Out Gain, Aux Out Gain, Polarity, Mute, Low Cut Filter, Mute, Pad, Phantom Power, Sample Clock, Test Tone, Group Assign, Snapshot, Recall Presets Mechanical Power: 90 to 260V, 60 watts Net weight: 17lbs. Dimensions: 3 1/2” x 19” x 13 5/8” All specifications are subject to change without written notice. Model 148- Digital Audio Splitter - 8 x 32 AES3 Splitter for 1788A Up to 192kHz Sampling Rates • 1 DB15 Input Connector • 4 DB15 Output Connectors Meets Full AES/EBU Input and Output Specification • Adds No Jitter No Setup Required • Low Cost • High Reliability • Transformer Isolated Internal Power Supply • 1/2 Rack Package • Available as 110ΩΩ Balanced or 75ΩΩ UnBalanced Model 148 - Front panel Model 148 - Rear panel I M P R O V I N G T H E W A Y T H E W O R L D S O U N D s SM 11068 Randall Street, Sun Valley, CA 91352 U.S.A. 818-767-2929 • Fax: 818-767-2641 • www.aphex.com Aphex, MicLim and LeNA are trademarks of Aphex Systems Ltd. Windows 95,98, 2000 & XP are trademarks of Microsoft Corporation. Mac OS X is a trademark of Apple Corporation. ADAT is a registered trademark of Alesis Corporation. Jensen is a registered trademark of Jensen Laboratories. T/DIF is a registered trademark of TASCAM Corporation.
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