Alto VERB II Service Manual

Service Manual

Model: αVERB II

40-BIT DIGITAL EFFECTS MODULE

www.altoproaudio.com

CONTENTS

1. INTRODUCTION

2. SPECIFICATION

3. BLOCK DIAGRAM

4. SCHEMATIC DIAGRAM

5. PCB LAYOUT

6. TEST PROCEDURE

7. BOM

8. EXPLODED VIEWS & MECHANICAL PARTS LIST

Robust and Compact Design

1. INTRODUCTION

- 1 -

40-bit Digital Audio Processor

16 Great Sounding Programs

Variation adjust knob (16 positions)

256 presets in total

Analog Mix (Dry/Wet) control

User adjustable Input and Output Gain

Stereo/Mono Jack Inputs

LED control for digital overdrive

Easy to operate Front Panel controls

SMT Design for greater reliability

Short Signal Path and no internal cabling to provide superior sound

Manufactured under QS9000, VDA6.1 Quality System

Electrical

2. SPECIFICATION

- 2 -

Frequency Response +0.5 / -1.5 dB from 20 Hz to 20 kHz
S/N Ratio (process) 80 dB "A" wtg, 20 Hz-22 kHz
S/N Ratio (bypass) >90 dB "A" wtg, 20 Hz-22 kHz
THD+Noise <0.008% @ 1 kHz (0 dBv, bypass)

Input

Number of Channels 2
Format 1/4" unbalanced
Maximum Level (bypass) +9 dBu
Impedance >500 kOhms

A/D - D/A Conversions

A/D converter 1 bit Sigma -Delta
D/A converter 1 bit Sigma -Delta

Output

Number of Channels 2
Format 1/4" unbalanced
Maximum Level (bypass) +9 dBu
Output Impedance <500 Ohms

Front Panel

Controls IN/OUT levels (ANALOG)

PROGRAM selections (2 knobs)

Indicators Power, Signal clip LED

Rear Panel

Input (LEFT/MONO, RIGHT) 1/4" 2-conductor (mono)
Output (LEFT, RIGHT) 1/4" 2-conductor (mono)
BYPASS 1/4" 2-conductor (auto-sense pedal type) for

momentary footswitches

Power 9 Volt AC Power Adaptor

Processing and Memory

Processor Speed 12 MIPs (million instructions per second)
Internal DSP resolution 52-bit MPY accumulator
Main Preset Programs 16
Preset Total Combinations 256
Internal digital audio memory 3000 milliseconds

Physical

Net Weight 0.76 kg (1.26 lb)
Dimension 197(W)×131(D)×44(H)mm (7.76" × 5.12"× 1.73")

OUTPUT GAIN

3. BLOCK DIAGRAM

- 3 -

L OUTPUT

MIX

R OUTPUT

OUTPUT GAIN

Singal LED

BYPASS

LOUT

MUTE

LIN

Input gain

L IN

ROUT

CHEE

RIN

MIX

If only LIN Input :

1.LIN MONO

2.RIN OPEN

Distortion detect

Input gain

R IN

4-14-1

4. SCHEMATIC DIAGRAM

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