zapco SEQ User Manual

Model SEQ

Preamp - Equalizer

A.R.P.A. OF AMERICA CORP.

MADE IN MODESTO, CA U.S.A.

Contents

Introduction 3

Features 3

Installation Instructions 4

Connecting the SEQ 5

Operation and Calibration 6

Input Gain Control 6

Mounting Method 7

SEQ Wiring Diagram-Method 1 9

SEQ Wiring Diagram-Method 2 10

Help - Technical Assistance 11

Manufacturing 12

2

Introduction

Congratulations! You have just chosen the premium in car audio
equipment. ZAPCO has well established its place as the technological
leader in the car audio industry. Because of this, you can rest assured
that you have the best car audio components in the world.

The ZAPCO SEQ Stereo preamp/equalizer provides multiple control
functions with 9 x 2 bands of graphic equalization (with separate controls
for each channel) in a compact, heavy-duty die cast package, utilizing
low noise, high slew rate amplifiers throughout.

Features

• 18 dB boost/cut range on eq bands.

• Custom slide pot taper for smooth gain change and better resolution.

• Master volume control using high-quality conductive plastic

potentiometers with superior L/R tracking and very low noise.

• Input and output LED overload indicators, accurate to within 1 dB of
clipping.

• On-off 22 dB cut switch with de-thumping circuitry.

• Variable-gain input preamplifier with 6 to 26 dB adjustable gain for

matching to low or high output level decks.

• Signal to noise >98 dB.

• Low impedance output drives long cables.

3

Installation Instructions

The cable supplied with your SEQ is comprised of seven wires. These
seven wires are terminated on one end in a connector designed to be
inserted into the back of the SEQ. The other wire ends have been left
unterminated.

The following are instructions on proper connection of the seven
unterminated wire ends and additional wiring to ensure proper system
grounding.

WIRES INSIDE SHIELDED CABLE:
Five wires are contained within the gray jacketed, shielded cable.

Signal inputs (to SEQ), outputs (from SEQ) & signal ground are all
contained within the shielded cable. Function & connection of these
wires are as follows unless otherwise indicated on a tag attached to the
cable:

Green - Right Channel Input

(to SEQ from right channel output of source unit)

White - Left Channel Input

(to SEQ from left channel output of source unit)

Red - Right Channel Output

(from SEQ to right channel input of amplifier)

Black - Left Channel Output

(from SEQ to left channel input of amplifier)

Bare - Signal Ground

(from shielded cable to case of source unit)*

WIRES EXTERNAL TO SHIELDED CABLE:
Two wires are external to the gray jacketed, shielded cable.

Power Input & Power Ground connections are external to the shielded
cable. Function & connection of these wires are as follows:

Red - Power Input to SEQ

(connect to constant, ‘unswitched’, 12V source - fused)**

Black - Power Ground

(connect to case of source unit)*

4