2 SERIES EQUALIZER O PERATION M ANUAL M ODE D ’ EMPLOI B EDIENUNGSANLEITUNG M ODO DE EMPLEO
IMPORTANT SAFETY INFORMATION CAUTION RISK OF ELECTRIC SHOCK DO NOT OPEN WARNING FOR YOUR PROTECTION READ THE FOLLOWING: 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 The symbols shown above are internationally accepted symbols that warn of potential hazards with electrical products.
IMPORTANT SAFETY INFORMATION 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. NEVER UNDER ANY CIRCUMSTANCES SHOULD YOU INSERT A DAMAGED OR CUT MAINS PLUG INTO A 13 AMP POWER SOCKET. Do not use the mains plug without the fuse cover in place. Replacement fuse covers can be obtained from your local retailer. Replacement fuses are 13 amps and MUST be ASTA approved to BS1362.
12 SERIES GRAPHIC EQUALIZERS MANUAL CONTENTS MANUAL CONTENTS INTRODUCTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 INSPECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 OPERATING CONTROLS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 CONNECTING THE EQ TO YOUR SYSTEM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
OPERATION MANUAL INTRODUCTION Congratulations on your purchase of a dbx graphic equalizer. All dbx graphic equalizers are high performance multi-functional units designed to deliver all the flexibility and power that professional users demand. We recommend that you take a moment to read through this operation manual. It provides information that will assist you from system set-up to EQ applications. The 12 Series Equalizers include the following features: Hl^iX]VWaZ 7ddhi$8ji gVc\Z WZil
12 SERIES GRAPHIC EQUALIZERS OPERATION MANUAL Input Gain Control: I]^h Xdcigda hZih i]Z h^\cVa aZkZa id i]Z ZfjVa^oZg# >i ^h XVeVWaZ d[ "&'Y7 id &'Y7 d[ \V^c# >ih Z[[ZXi ^h VeeVgZci Wn k^Zl^c\ i]Z DJIEJI A:K:A 76G CEJI <6>C! dg ADL 8JI [^aiZgh# EQ Bypass LED: I]^h gZY A:9 a^\]ih l]Zc i]Z :F ^h ^c WneVhh bdYZ# CdiZ i]Vi WneVhh bdYZ dcan
OPERATION MANUAL power switch or a master equipment power switch. Since the 12 Series Equalizers consume a relatively small Vbdjci d[ edlZg! i]Z jc^ih bVn WZ aZ[i dc Xdci^cjdjhan# REAR PANEL DESCRIPTIONS Rear Panels 1231 - dual channel 31 band graphic equalizer &'&* " YjVa X]VccZa &* WVcY \gVe]^X ZfjVa^oZg Power Switch: Switches the power on and off. Always make audio connections with the power switch in the D;; position. Power Cord Receptacle: Connects AC power to the equalizer.
OPERATION MANUAL 12 SERIES GRAPHIC EQUALIZERS Wiring Connections With Ground Without Jumper in Place circuit ground With Jumper in Place chassis ground + circuit ground + chassis ground + + jumper to system ground + Output Cable + optional Input Cable + Output Cable + optional Input Cable INSTALLATION CONSIDERATIONS +RRNXSV DQG &DEOLQJ I]Z &' HZg^Zh :fjVa^oZgh VgZ YZh^\cZY [dg cdb^cVa )Y7j aZkZah# I]Z ZfjVa^oZgh XVc WZ jhZY l^i] Z^i]Zg WVaVcXZY dg jcWVaVcXZY hdjgXZh! VcY i]Z djiejih
OPERATION MANUAL TECHNICAL SUPPORT / FACTORY SERVICE The dbx 12 Series EQs are all solid-state products with components chosen for high performance and excellent reliVW^a^in# :VX] jc^i ]Vh WZZc iZhiZY VcY WjgcZY"^c Vi i]Z [VXidgn# Cd VY_jhibZci d[ Vcn ineZ h]djaY WZ gZfj^gZY throughout the life of the unit. >[ X^gXjbhiVcXZh Vg^hZ l]^X] cZXZhh^iViZ gZeV^g! lZ gZXdbbZcY i]Vi ndjg :F WZ gZijgcZY id i]Z [VXidgn# I]^h XVc dcan WZ YdcZ Wn gZXZ^k^c\ V G:IJGC 6JI=DG>O6I>DC cjbWZg [gdb YWm XjhidbZg hZgk^XZ# >[ nd
12 SERIES GRAPHIC EQUALIZERS OPERATION MANUAL SPECIFICATIONS / CARACTÉRISTIQUES TECHNIQUES / TECHNISCHE DATEN / ESPECIFICACIONES ,QSXWV (QWUpHV (LQJlQJH (QWUDGDV 8dccZXidgh/ &$) IGH! [ZbVaZ MAG e^c ' ]di ! VcY WVgg^Zg iZgb^cVa hig^e 8dccZXiZjgh / ?VX`h +!(* bb! MAG [ZbZaaZ ed^ci X]VjY 2 WgdX]Z ' Zi Wdgc^Zg 6chX]ahhZ/ +!("bb"HiZgZd`a^c`ZcWjX]hZc! MAG"7jX]hZc lZ^Wa# >ce]VhZ 2 Hi^[i ' jcY @aZbbaZ^hiZ 8dcZXidgZh/ 8aVk^_Vh _VX` ZhigZd +!( bb! MAG ]ZbWgV Zhe^\V ' 2 Zc [VhZ n gZ\aZiV
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RF Filter Input Input Gain 40Hz Range ±15dB 20Hz 20kHz .....
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-15 0 +15 -15 The dbx 12 Series were designed to meet the needs of the most demanding sound reinforcement environments, while offering the simplicity of straightforward controls. The 1231 provides standard features like dual-channels, 31 1/3 octave bands, ISO frequency centers, +/- 12 dB input gain range, and switchable 40Hz/18 dB per octave lowcut filters, but also includes other insightful features.
1231 DUAL CHANNEL 31 BAND EQUALIZER -10 0 +10 +18 10 6 3 1 +6 +15 OUTPUT LEVEL (dBu) CLIP +/-15 0 +/-6 0 -12 EQ BYPASS dB 0 +12 INPUT GAIN LOW CUT RANGE -6 -15 20 -10 0 25 31.5 40 50 63 80 100 125 160 200 250 315 400 500 630 800 1k 1.25k 1.6k 2k 2.5k 3.15k 4k 5k 6.3k 8k 10k 12.