Lyngdorf Audio SDAI 2175 User Manual

Owner´s manual

SDAI 2175

Semi Digital Amplifi er Integrated

2

Table of Contents

Operating Voltage 4

Unpacking the SDAI 2175 4

Serial Number Registration 4

Introduction 5

Accessories 6

Front Panel 7

- Controls 7

- Display 8

Rear Panel 9

Menu system 10

Menu Tree 11

- RELVOL - Relative Volume 11

- SENSIT - Sensitivity 11

- BRIGHT - Brightness 11

- IR RMT - IR Remote 11

- INPTXT - Select Input Text 11

- LNKID - Link Address 12

- LNKSP - Link Comm. Speed 12

- BAL LR - Balance Left Right 12

- DEFVOL - Default Volume 12

- MAXVOL - Maximum Volume 12

Software 13

Connectors 14

- Mains Connector 14

- Loudspeaker connectors 14

- Input connectors 14

- Balanced inputs 14

- Unbalanced inputs 14

- Trigger connectors 15

Cleaning and Maintenance 15

Technical Specifi cations 16

- Audio 16

- Protection 17

- Mains 17

- Trigger 17

- Mechanical 17

Technical Assistance 18

Manual version 10-05-07

3

Operating Voltage

The SDAI 2175 is available in a version for 115V mains voltage and in a version for 230V mains voltage.

Check the label on the SDAI 2175 rear panel and verify you have the version with the proper voltage for
your area.
The 115V version requires a mains voltage of 100V-120V at 50-60Hz with a current rating of 8A.
The 230V version requires a mains voltage of 200V-240V at 50-60Hz with a current rating of 4A.

The mains voltage setting for your SDAI 2175 can be changed ONLY BY A QUALIFIED ENGINEER.

Connect the power input only to the AC source printed on the label. The warranty
will not cover any damage caused by connecting to the wrong type of AC mains.

Unpacking the SDAI 2175

Carefully remove the unit and accessory kit from the carton, visually check for shipping damage. Contact
both the shipper and Lyngdorf Audio immediately if the unit bears any sign of damage from mishandling.
All Lyngdorf Audio equipment is carefully inspected before leaving our factory.

Keep shipping carton and packing material for future use or in the unlikely event that
the unit needs servicing. If this unit is shipped without the original packing, damage
could occur and void the warranty.

Serial Number Registration

Please record the serial number of your amplifi er here for future reference. The serial number is printed
on the label on the SDAI 2175 rear panel. You will need this serial number, should you ever require
service for your SDAI 2175 power amplifi er.

SDAI 2175 serial number: _____________________

4

Introduction

Lyngdorf SDAI 2175 is a compact, high performance semi digital integrated switch-mode amplifi er utilizing
some of the circuit topologies originally developed for the Lyngdorf Millennium amplifi er. Due to the
switch-mode topology, with an effi ciency of up to 85%, the SDAI 2175 will provide its output power
with minimal heat dissipation. A massive power supply with a 650VA toroid transformer and more than
40000uF capacitors ensures that the SDAI 2175 can deliver the current to drive even the most demand­ing loudspeakers.

The SDAI 2175 has 2 gold-plated XLR connectors accepting balanced input signals and 6 stereo inputs
with 2 gold-plated RCA connectors for unbalanced signals. The SDAI 2175 has a stereo tape out of the
selected line level input signal and pre out of the selected input signal after the volume control as either
balanced signal from the gold-plated XLR connectors or unbalanced from the gold-plated RCA connec­tors.

The volume control is implemented as a high precision digital controlled analog attenuation in 0.1 dB
steps over a 100 dB range. Input selection is performed via precision relays with double gold plated
construction of the contact set. These kind of relays are normally only used in expensive measurement
equipment for high linearity and low losses.

All controls can be operated from the front panel via the logical user interface or by use of the remote
control. Or as an option the setup and operation can be performed via a PC interface.

The input signal is fed to the volume control circuit via an AC coupled true instrumentation type input
amplifi er. Except for this AC coupling, the SDAI 2175 is fully DC coupled with no bypass capacitors or DC
servos to degrade the performance. The protection circuitry in the SDAI 2175 shuts down the unit in case
of over-temperature, DC voltage on the outputs and too high output current. The amplifi er will resume
normal operation when the fault condition is no longer present.

A trigger output on a 3.5mm jack connector allows the SDAI 2175 to control one or more SDA2175’s
power condition.

5

Accessories

You should fi nd the following accessories included:

Mains cord This manual

2 3

1

456

7

809

digital

info

analog

menu

RCS CD

TUNER

AMP

channel

volume

ENTER

A/B

repeat

random

Remote control

Programming cable

6