® 120A Subharmonic Synthesizer with Modeled Waveform Synthesis™ User Manual
IMPORTANT SAFETY INSTRUCTIONS WARNING FOR YOUR PROTECTION PLEASE READ THE FOLLOWING: CAUTION RISK OF ELECTRIC SHOCK DO NOT OPEN KEEP THESE INSTRUCTIONS A T T E N T I O N : RISQUE DE CHOC ELECTRIQUE - NE PAS OUVRIR W A R N I N G : TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK DO NOT EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE HEED ALL WARNINGS FOLLOW ALL INSTRUCTIONS DO NOT USE THIS APPARATUS NEAR WATER The symbols shown above are internationally accepted symbols that warn of potential hazards with electri
IMPORTANT SAFETY INSTRUCTIONS LITHIUM BATTERY WARNING CAUTION! This product may contain a lithium battery.There is danger of explosion if the battery is incorrectly replaced. Replace only with an Eveready CR 2032 or equivalent. Make sure the battery is installed with the correct polarity. Discard used batteries according to manufacturer’s instructions. U.K. MAINS PLUG WARNING A molded mains plug that has been cut off from the cord is unsafe. Discard the mains plug at a suitable disposal facility.
120A Table of Contents Introduction 0.1 Defining the 120A .............................................i 0.2 Service Contact Info.........................................ii 0.3 Warranty............................................................ii Section 1 - Operation and Appendix 1.1 Rear Panel Connections ...................................1 1.2 Front Panel Connections..................................1 1.3 Operating Notes ...............................................2 1.4 Basic Connection..........
120A INTRODUCTION INTRO CUSTOMER SERVICE INFO 120A DEFINED WARRANTY INFO ®
120A Introduction INTRODUCTION Congratulations on your purchase of the dbx® Professional Products 120A Subharmonic Synthesizer with Modeled Waveform Synthesis™. The 120A has been specifically optimized to enhance Bass audio material for use in a variety of professional applications, including nightclub and dance DJ mixing, theatre and film sound, music recording, live music performance and broadcasting.
120A Introduction 0.2 Service Contact Info If you require technical support, contact dbx Customer Service. Be prepared to accurately describe the problem. Know the serial number of your unit. This is printed on a sticker attached to the rear panel. If you have not already taken the time to fill out your warranty registration card and send it in, please do so now. Before you return a product to the factory for service, we recommend you refer to the manual.
120A ®
120A Front and rear Descriptions Section 1 1.1 Rear Panel Connections A B C D E A- IEC Power Cord Receptacle This is the power cord receptacle of the 120A. An IEC cord is included with the shipped product. B- Subwoofer Output Connector This output connector sends signal to your subwoofer amplifier, the low bass signal which ranges from 20 Hz up to the crossover frequency (80Hz to 120Hz). Nominal output signal level is +4dBu into 600 Ω, and typical maximum output level is +22dBu into 600 Ω.
Section 1 120A Front and Rear Panel Descriptions J- Subwoofer Level Control This control sets the level of the low frequency crossover signal (original program plus synthesized harmonics) coming out of the SUBWOOFER jack. K- LF Boost Control This control is used to even out the total apparent Bass output of the 120A.
120A Operating Notes Section 1 Avoiding Transients Any sharp noises from your sound system can be hard on your system, and since the 120A amplifies and augments all low-frequency information, extra caution is called for at all times. To be safe, turn the power amp on last, and off first. and always keep the main volume control low or off when turning the system or any of its components on. To further reduce the chance of dangerous transients, make sure your system is operating at its optimum performance.
Section 1 120A Connecting to Your System 1.4 Connecting the 120A to Your System Basic Connection The 120A can be used with any line-level device. For more specific cabling information, refer to the Cable diagram on page 7. 1. Turn off all equipment before making any connections. 2. Mount the 120A in a 1U Rack Space (optional) The 120A requires one rack space. It can be mounted above or below anything that doesn’t generate excessive heat, since it requires no special ventilation.
120A Block Diagram Appendix Appendix 24-36Hz 36-56Hz A.
Appendix 120A Specifications A.2 Specifications Frequency Response: 20Hz-20kHz ±0.5dB, (no synthesis, full-range mode) 15Hz-90kHz +0, -3dB Input Impedance: ≥40kΩ Balanced or 20kΩ unbalanced (1/4”) 20kΩ (RCA) Maximum Input Level: +22dBu (1/4”) +8.5dBV (RCA) Output Impedance: 100Ω, Impedance balanced Maximum Output Level: +22dBu into 600Ω Connector Type: 1/4" TRS Jacks (Inputs and Outputs) RCA (Inputs) THD: 0.05% (no synthesis, either output) Output noise: -88dBu, controls@max.
120A Wiring Diagrams Appendix A.3 Installation Considerations and Wiring Diagrams The 120A has 1/4”, balanced/unbalanced inputs and is designed for nominal +4dBu levels. The 120A also offers RCA connectors, and is designed for nominal -10dBV levels. Input Cable Configurations The 120A will accept either balanced or unbalanced sources as long as cables are wired according to the following diagrams. In an emergency, 1/4” mono cables will work. Connect the sleeve to the cable’s shield.
® A Harman International Company 8760 South Sandy Pkwy. Sandy, Utah 84070 Phone: (801) 568-7660 Fax: (801) 568-7662 Questions or comments? E•mail us at: customer@dbxpro.com or visit our World Wide Web home page at: www.dbxpro.
