Lyngdorf Audio SDAI 2175 Manuale utente

Owner´s manual

SDAI 2175

Semi Digital Ampliﬁer Integrated

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 Speciﬁcations 16

- Audio 16

- Protection 17

- Mains 17

- Trigger 17

- Mechanical 17

Technical Assistance 18

Manual version 10-05-07

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 ampliﬁer 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 ampliﬁer.

SDAI 2175 serial number: _____________________

Introduction

Lyngdorf SDAI 2175 is a compact, high performance semi digital integrated switch-mode ampliﬁer utilizing

some of the circuit topologies originally developed for the Lyngdorf Millennium ampliﬁer. Due to the

switch-mode topology, with an efﬁciency 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 demand-

ing 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 connec-

tors.

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

ampliﬁer. 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 ampliﬁer 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.

Accessories

You should ﬁnd the following accessories included:

Mains cord This manual

12 3

456

digital info

analog

A/B random repeat

AMP

channel

ENTER

volume

RCS CD TUNER

Programming cable

Remote control

Front Panel

Controls

The buttons/controls on the front panel of the SDAI 2175 can all be used either with direct presses on

the front or by operating the similar keys on the included remote control. All keys on the front except for

the Mains switch (1) can be found on the remote control as well.

1. Mains switch

Turns the power to the unit On or Off.

2. Power

Changes the SDAI 2175 mode between Standby and Active.

3. Menu

Toggles Menu mode on/off.

4. Enter

Activates sub menus for active changes.

5-11. Input selectors

Selects active input, or in menu system select input to change.

12. Volume

-/+ indicates decrease and increase in volume control or in menu mode toggles sub menus, or in menu

active mode toggles parameters.

13. Mute

Toggles mute for SDAI 2175.

Display

12 3 4 5 6 7

1. OPERATE

Indicates the operational status of the SDAI 2175.

Off:• The SDAI 2175 is in standby mode.

Flashing:• The SDAI 2175 is in the soft-start phase or the

protection circuit is engaged.

On:• The SDAI 2175 is operating normally.

2. POWER

Illuminated whenever the power is applied to the SDAI 2175 and the mains switch is ON.

3. MENU

Indicates the Menu system is operative of the SDAI 2175.

Off:• The SDAI 2175 is in normal mode.

Flashing:• The SDAI 2175 is in menu active mode.

On:• The SDAI 2175 is in menu select mode.

Menu active mode indicates the menu button (3) have been pressed and the different menus can be

either toggled by pressing -/+ (12) or selected for changes with enter (4).

4. 1-7

Illuminates active input

5. 14 Segment display

Main menu system information 6*14 segment display.

6. VOLUME

3 digits indicating Volume control setting from 00.0 to 99.9 – in dB’s

7. MUTE

Illuminated when Mute is active

Rear Panel

1-6. Input

RCA unbalanced input channel 1-6.

7. Input

Balanced stereo input channel 7.

8. Tape Out

Line output of selected input.

9. Pre Out

Regulated output after volume control of selected input.

10. Pre Out Bal

Balanced regulated output after volume control of selected input.

11. Trigger Out

DC Trigger out for remote start of SDA 2175 power ampliﬁers or similar equipment.

12-13. Input

RS232 communication connectors for communication with PC.

14. Loudspeaker Connectors

Stereo Loudspeaker output

15. Mains socket

Menu system

The Menu system of the SDAI 2175 can be used for setting up the amplifer for nearly all everyday situations.

The only feature which can not be changed from the menu system is custom naming of the input texts

which can only be performed from the SDAI Pack PC setup program available for download from www.

lyngdorf.com.

The menu system of the SDAI2175 can be entered by pressing the Menu key (3) where after the menu

indicator will be illuminated. The volume control keys (12) now changes status from being volume control

keys to be sub menu selectors for the menu system. Pressing the keys changes between the different

menus seen in ﬁg.1.

When the wanted menu system is found, it can be activated with the Enter key (4). When active the

menu LED starts blinking and the parameters for the active setting can be changed with the volume

control keys (12). The changes can be conﬁrmed and stored by pressing the Enter key (4) or the changes

can be skipped by pressing menu which exit’s the menu system again.

The menu system is shown on Fig. 1, and the different sub menus will be explained in the following.

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