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Introduction

®

120A User Manual

i

120A

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 night-
club and dance DJ mixing, theatre and film sound, music recording, live music performance and
broadcasting.

The 120A’s two separate bands of subharmonic synthesis provide the best combination of
smoothness and control, and the independent low frequency boost circuit is designed to get the
most out of high-performance low frequency speaker systems.  Flexible system interfacing is
achieved by providing main outputs which can be full range (including synthesis) or high-fre-
quency ONLY, along with a separate subwoofer output with its own level control.

This manual will be your guide to understanding the full functionality of the powerful 120A.
After you have become familiar with the unit, we encourage you to experiment and find cre-
ative ways that the 120A can help you optimize your specific application.

The 120A’s patented modeled Waveform Synthesis™ process builds a synthesized waveform
using the wave shapes of the original bass material, producing a new Waveform Modeled™ bass
note, exactly one octave below the bass in the original audio signal path.  Unlike other attempts
at bass synthesis, the dbx Professional Products 120A process produces smooth, musical low
frequencies that do not interfere with mid and high-band information even when the maximum
synthesis and boost are applied.  The result is a low-end punch that people really feel, even at
system levels that won’t destroy sound equipment or damage hearing.  The 120A offers the fol-

lowing features:

•  Patented Modeled Waveform Synthesis™ Circuitry insures that mid and

high frequencies are not affected

•  Individual Controls for Two Separate ranges of Subharmonic Frequencies,

plus Master Synthesis Level Control

•  Separate Low Frequency Boost Circuit

•  Separate Subwoofer Output

•  1/4” Balanced Inputs and 1/4” Impedance-Balanced Outputs

•  RCA Inputs

•  LF Synthesis LED Indicators

•  Selectable Crossover with 80Hz and 120Hz crossover points

INTRODUCTION

Содержание 120A

Страница 1: ...120A Subharmonic Synthesizer with Modeled Waveform Synthesis User Manual...

Страница 2: ...or equiv alent This Equipment is intended for rack mount use only SAFETY INSTRUCTIONS NOTICE FOR CUSTOMERS IF YOUR UNIT IS EQUIPPED WITH A POWER CORD WARNING THIS APPLIANCE MUST BE EARTHED The cores...

Страница 3: ...osionsfara vid felaktigt batteribyte Anv nd samma batteri typ eller en ekvivalent typ som rekommenderas av apparattil lverkaren Kassera anv nt batteri enligt fabrikantens instruk tion IMPORTANT SAFETY...

Страница 4: ...ntact 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 4 Appendix A 1 Block Diagram 5 A 2...

Страница 5: ...INTRO CUSTOMER SERVICE INFO 120A DEFINED WARRANTY INFO INTRODUCTION 120A...

Страница 6: ...ge you to experiment and find cre ative ways that the 120A can help you optimize your specific application The 120A s patented modeled Waveform Synthesis process builds a synthesized waveform using th...

Страница 7: ...d not collect Do not ship parcel post This warranty is valid only for the original purchaser and only in the United States 1 The warranty registration card that accompanies this product must be mailed...

Страница 8: ...120A...

Страница 9: ...input section of the 120A offers electronically balanced unbalanced 1 4 connections with a nominal input level of 4dBu and clipping level is at 22dBu into 600 The 120A also offers RCA input connector...

Страница 10: ...s are bottoming out making a ticking popping sound or fuses are blowing or your amp is clipping try turning down the 24Hz 36Hz level You may find that a setting produces fine results in one room but p...

Страница 11: ...them maximally different If you do reposition your speakers you should also reset any output level controls on the back of the speaker cabinet Many speakers offer a slight HF or MF boost with these c...

Страница 12: ...he ampli fication for the main speakers to Channel 1 and Channel 2 Output Jacks Operation without a Subwoofer Set the OUTPUT switch to FULL RANGE and connect the amplification for the main speakers to...

Страница 13: ...Block Diagram Appendix 120A Appendix 24 36Hz 36 56Hz A 1 Block diagram 5...

Страница 14: ...26 36Hz and 36 56Hz Band Synthesis Level Subharmonics Low Frequency Boost Subwoofer Output Crossover Frequency Select Crossover in out Indicators Power Crossover Bypass Metering Synthesis activity 3 L...

Страница 15: ...20A s input and output The best start ing point is to ground the shield of the input cable at the source device leaving it unconnected at the 120A Output Cable Configurations The 120A will drive eithe...

Страница 16: ...andy 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 com A Harman International Com...

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