dbx 120A User Manual Download Page 9

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120A User Manual

1

Front and rear Descriptions

Section 1

120A

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 

, and typical maximum output level is +22dBu into 600 

.  This output is an imped-

ance-balanced output. 

C- Crossover Selector Switch

This switch is used to engage the crossover function.

D- Output Connectors

The output section of the 120A offers impedance balanced/unbalanced 1/4” connections with a
nominal output signal level at +4dBu into 600 

, and typical maximum output level is +22dBu

into 600 

.  

E- Input Connectors

The 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 connectors with a nominal input level of -10dBV and clipping at +8dBV.

F- Power LED

This red LED indicates that power has been applied to the 120A.

G- Synthesis Bypass 

Pressing the SYNTHESIS BYPASS will engage (when lit) or bypass the Synthesis effect of the
120A.

H- Crossover Select 

This button is used to the select the desired crossover frequency of the 120A.  When pressed
and lit, the 120Hz crossover frequency is engaged.  Otherwise, the 80Hz frequency is used.

I- Crossover LED

This green LED (when lit) indicates that the active crossover has been selected. In this case, the
mains outputs (channel 1 and channel 2) contain only the high-frequency portion of the signal,
while the low-frequency portion appears at the mono Subwoofer output. 

Subharmonic

Synthesizer

F

G H

I

J

K

L

M

1.2 Front Panel Controls

A

B

C

D

E

1.1 Rear Panel Connections

Summary of Contents for 120A

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

Page 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...

Page 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...

Page 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...

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

Page 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...

Page 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...

Page 8: ...120A...

Page 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...

Page 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...

Page 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...

Page 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...

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

Page 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...

Page 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...

Page 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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