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Introduction 

Lyngdorf SDA 2175 is a compact, high-performance analog switch-mode amplifier utilizing 
some of the circuit topologies originally developed for the Lyngdorf Millennium and M2150 
amplifiers. Due to the switch-mode topology, with an efficiency of up to 85%, the SDA 2175 
will provide its output power with minimal heat dissipation. A massive power supply with a 
650VA toroidal transformer and more than 40000 microF capacitors ensures that the SDA 
2175 can deliver the current to drive even the most demanding loudspeakers. The SDA 2175 
has 2 gold-plated XLR connectors accepting balanced input signals and 2 gold-plated phono 
connectors for unbalanced signals. The input signal is fed to the power amplifier circuit via an 
AC-coupled true instrumentation type input amplifier. Except for the input amplifier, the SDA 
2175 is fully DC coupled with no bypass capacitors or DC servos to degrade performance. 
The protection circuitry in the SDA 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 input and bypass on 3.5 mm minijack 
connectors allow the SDA 2175´s standby mode to be controlled remotely. 

Front panel 

Fig 1: SDA 2175 front panel. 

Controls 

Mains switch 
Turns the power to the unit on or off. 

Indicators 

OPERATE 
Indicates the operational status of the SDA 2175. 
Off 

The SDA 2175 is in standby mode (controlled via the TRIGGER input). 

Flashing 

The SDA 2175 is in soft-start mode or the protection circuit is engaged. 

On 

The SDA 2175 is operating normally. 

 

POWER 
Illuminates when power is applied to the SDA 2175 and the mains switch is ON. 

 

Содержание SDA 2175

Страница 1: ...SDA 2175 Compact Analog Power Amplifier Owner s Manual...

Страница 2: ...ns 5 Introduction 6 Front panel 6 Controls 6 Indicators 6 Rear panel 7 Mains Connector 7 Loudspeaker connectors 7 Input connectors 8 Balanced inputs 8 Unbalanced inputs 9 Trigger connectors 9 Cleaning...

Страница 3: ...in the literature accompanying the product Lightning symbol The lightning with arrowhead symbol within an equilateral triangle is intended to alert the user to the presence of uninsulated Dangerous Vo...

Страница 4: ...moving the cart apparatus combination to avoid injury from tip over 13 Unplug this apparatus during lightning storms or when unused for long periods of time 14 Connect only to the proper mains voltag...

Страница 5: ...he mains voltage setting for your SDA 2175 can be changed ONLY BY A QUALIFIED TECHNICIAN WARNING Connect the power input only to the AC source printed on the label The warranty will not cover any dama...

Страница 6: ...strumentation type input amplifier Except for the input amplifier the SDA 2175 is fully DC coupled with no bypass capacitors or DC servos to degrade performance The protection circuitry in the SDA 217...

Страница 7: ...ins Loudspeaker connectors The SDA 2175 loudspeaker connectors accept banana plugs spades or bare wire ends up to 5 mm in diameter Connect the wires from each loudspeaker to each channel s and termina...

Страница 8: ...nced inputs The balanced XLR inputs are wired in accordance with IEC268 Pin 1 Chassis and ground Pin 2 Hot Pin 3 Cold Shell Chassis and ground When the balanced inputs are used with a balanced source...

Страница 9: ...he TRIGGER IN socket the SDA 2175 standby mode is controlled by the voltage on the plug With no voltage applied the SDA 2175 will go into standby mode If a DC voltage of 5 24V or a 50Hz AC voltage of...

Страница 10: ...Nominal load impedance 4 8 Ohms It is safe to operate the amplifier with no load Frequency response 0 3 Hz 33 kHz 3 dB points 8 Ohms load Frequency response 0dB 0 2dB 20 Hz 20 kHz 8 Ohms load Frequen...

Страница 11: ...on 1 5 W STANDBY mode Power consumption 35 W OPERATE mode no output Power consumption 116 W 2 x 37 5 W 4 Ohms Power consumption 820 W 2 x 300 W 4 Ohms Trigger Parameter Value Note TRIGGER IN connector...

Страница 12: ...epresentative Support Please check the Lyngdorf Audio Denmark website under Support for latest version of control software newest version of this document and Questions and Answers Lyngdorf Audio Denm...

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