Lyngdorf Audio Stereo Amplifier SDA 2175 User Manual

SDA 2175  
Compact Analog Power Amplifier  
Owner’s Manual  
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WARNINGS  
TO REDUCE THE RISK OF FIRE OR ELECTRICAL SHOCK, DO NOT EXPOSE THIS  
APPLIANCE TO RAIN OR MOISTURE  
CAUTION: TO REDUCE THE RISK OF ELECTRICAL SHOCK,  
DO NOT REMOVE COVER. NO USER-SERVICEABLE PARTS  
INSIDE. REFER SERVICING TO QUALIFIED PERSONNEL  
.
CAUTION  
RISK OF ELECTRICAL  
SHOCK. DO NOT OPEN  
Explanation of symbols  
Exclamation symbol  
The exclamation point within an equilateral triangle is intended to alert the  
user to the presence of important operating and maintenance (service)  
instructions 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 Voltage” within  
the products’ enclosure that may be of sufficient magnitude to constitute a  
risk of electrical shock to a person.  
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Important safety instructions  
1:  
2:  
3:  
4:  
5:  
6:  
7:  
Read these instructions carefully before installing or operating this apparatus.  
Keep these instructions.  
Heed all warnings.  
Follow all instructions.  
Do not use this apparatus near water.  
Clean only with a dry cloth.  
Do not block any ventilation openings. Install in accordance with the manufacturer’s  
instructions.  
8:  
9:  
Do not install near any heat sources such as radiators, heat registers, stoves, or other  
apparatus that produce heat.  
Do not defeat the safety purpose of the grounding-type plug. A grounding-type plug has  
two pins and a third grounding prong. The third prong is provided for your safety. If the  
provided plug does not fit your outlet, consult an electrician for replacement of the  
obsolete outlet.  
10:  
Protect the power cord from being walked on or pinched, particularly at plugs,  
convenience receptacles, and the point where they exit from the apparatus. Do not use  
this unit with a damaged cord or plug.  
11:  
12:  
Only use attachments and accessories specified by the manufacturer.  
Use only with cart, stand, tripod, bracket, or table specified by the manufacturer, or sold  
with the apparatus. When a cart is used, use caution when moving the cart/apparatus  
combination to avoid injury from tip-over.  
13:  
14:  
15:  
Unplug this apparatus during lightning storms or when unused for long periods of time.  
Connect only to the proper mains voltage.  
Do not connect any output from the amplifier to any other amplifier's output or any other  
voltage source.  
15:  
17:  
To avoid electrical shock, make sure that no conductive part of the loudspeaker wiring is  
exposed while the amplifier is operating. Do not connect loudspeakers with uninsulated  
terminals to the amplifier.  
Refer all service to qualified service personnel. Service is required when the apparatus  
has been damaged in any way, such as when the power supply cord or plug are  
damaged, liquid has been spilled or objects have fallen into the apparatus, the apparatus  
has been exposed to rain or moisture, does not operate normally or has been dropped.  
Unpacking the SDA 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 shows any sign  
of damage from mishandling. All Lyngdorf Audio equipment is carefully inspected before  
leaving our factory.  
KEEP SHIPPING CARTON AND PACKING MATERIALS for future use or in  
the unlikely event that the unit needs service. If this unit is shipped without the  
original packing, damage could occur and void the warranty.  
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Accessories  
The following items are included in the accessories kit:  
1:  
2:  
3:  
One mains cord  
This manual  
Customer registration form  
Operating voltage  
The SDA 2175 is available in a version for 115V mains voltage and in a version for 230V  
mains voltage.  
Check the label on the SDA 2175 rear panel and verify that 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 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 damage caused by  
connecting to the wrong type of AC mains.  
Product Registrations  
Please record the serial number of your amplifier here for future reference. The serial number  
is printed on the label on the SDA 2175 rear panel. You will need this serial number, should  
you ever require service for your SDA 2175 power amplifier.  
SDA 2175 serial number: _____________________  
Please fill in the enclosed Customer registration form and submit it to  
Lyngdorf Audio, so that we can register you as owner of the unit and keep  
you informed of future upgrades of the product.  
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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  
Flashing  
On  
The SDA 2175 is in standby mode (controlled via the TRIGGER input).  
The SDA 2175 is in soft-start mode or the protection circuit is engaged.  
The SDA 2175 is operating normally.  
POWER  
Illuminates when power is applied to the SDA 2175 and the mains switch is ON.  
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Rear panel  
Fig 2: SDA 2175 rear panel.  
Mains Connector  
Mains voltage to the SDA 2175 is applied via an IEC320 type connector. The supplied cable  
with safety ground should be used to connect the SDA 2175 to a mains outlet.  
WARNING: 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.  
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 – terminals. Do not make any other  
connections to the output terminals. The loudspeaker cable is inserted  
into the slot in the loudspeaker terminal and the terminal is tightened  
firmly.  
WARNING: Always disconnect the SDA 2175 from the mains before  
changing any connections to its inputs or outputs.  
When the SDA 2175 is operating, there is 35V DC on its output terminals  
with reference to ground.  
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I
nput connectors  
The SDA 2175 has input sockets for both balanced and unbalanced signals, but only one may  
be used at a time. The XLR and phono sockets are internally connected in parallel, so only  
one set of the connectors should be connected externally. ALWAYS use EITHER the XLR  
inputs OR the phono inputs. NEVER use both at the same time.  
Fig 3: SDA 2175 Input configuration.  
Balanced 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, the input selector switch MUST  
be set to the BALANCED position. The switch position can be changed with a small  
screwdriver.  
If any cables are connected to the unbalanced inputs, remove these  
before the switch is put in the BALANCED position.  
We recommend the use of the balanced inputs whenever possible, as balanced signals are  
much less sensitive to noise than unbalanced signals.  
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Unbalanced inputs  
The unbalanced RCA inputs are wired in accordance with normal practice:  
Shell: Chassis and ground.  
Pin: Hot (+).  
When the unbalanced inputs are used, the input selector switch MUST be set to the  
UNBALANCED position. The switch position can be changed with a small screwdriver.  
The switch must be changed to the unbalanced position before any  
connections are made to the RCA connectors  
Trigger connectors  
The SDA 2175 is equipped with TRIGGER IN and TRIGGER BYPASS sockets. These are  
ordinary 3.5 mm mono mini jack sockets.  
When TRIGGER IN is left unconnected, the SDA 2175 will go into OPERATE mode when  
power is applied.  
If there is a plug in the 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 4-17Vrms is applied, the SDA 2175 will go into  
OPERATE mode.  
TRIGGER BYPASS is for daisy-chaining a number of SDA 2175 and controlling them via the  
same signal. Connect the control signal to TRIGGER IN on the first SDA 2175 and connect its  
TRIGGER BYPASS to TRIGGER IN on the next unit, etc.  
Cleaning and maintenance  
Always unplug the unit from the electrical outlet  
before cleaning.  
This unit does not require any regular maintenance except to keep its exterior clean. Simply  
wipe its exterior with a clean, soft cloth. A small amount of non-abrasive cleaner may be used  
on the cloth to remove any excessive dirt or fingerprints. Do not use abrasive cleaners.  
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Technical specifications  
Audio  
Parameter  
Balanced input connectors  
Value  
3-pin XLR, gold-plated  
Note  
Case=Gnd, Pin1=Gnd,  
Pin2=Hot(+), Pin3=Cold(-)  
AC-coupled  
20 Hz – 20 kHz  
Case=Gnd, Tip=Hot(+)  
AC-coupled  
Balanced input impedance  
Balanced input CMRR  
Unbalanced input connectors Phono, gold-plated.  
Unbalanced input impedance 100 KOhm  
10 KOhm  
40 dB  
Max. input voltage  
Input sensitivity  
Voltage gain  
15Vp AC, 0-20 VDC  
2 V  
26 dB  
4 insulated binding posts, gold-Will accept bare wire ends up  
200 W/8 Ohms  
Output connectors  
plated  
to 5 mm diameter.  
1 kHz, 1% THD+N  
1 kHz, 1% THD+N  
It is safe to operate the  
amplifier with no load.  
-3 dB points, 8 Ohms load.  
20 Hz - 20 kHz, 8 Ohms load  
20 Hz – 20 kHz, 4 Ohms load  
20 Hz - 1 kHz  
Output power, 8 Ohms  
Output power, 4 Ohms  
Nominal load impedance  
2 x 200 W  
2 x 375 W  
4 - 8 Ohms  
Frequency response  
Frequency response  
Frequency response  
Output impedance  
Output impedance  
THD+N, 1 W /8 Ohms  
THD+N, 1 W/4 Ohms  
THD+N, 100 W/8 Ohms  
THD+N, 180 W/8 Ohms  
THD+N, 275 W/4 Ohms  
S/N ratio  
0.3 Hz – 33 kHz  
-0dB/+0.2dB  
-0.2dB/+0dB  
0.035 Ohms  
0.4 Ohms  
0.004%  
20 kHz  
A-wgt.  
0.006%  
0.01%  
0.07%  
0.07%  
117 dB  
84 dB  
40 A  
A-wgt.  
A-wgt.  
A-wgt.  
A-wgt.  
A-wgt. ref 200 W/8 Ohms.  
1 kHz, 200 W/8 Ohms.  
Channel separation  
Peak output current  
Output common mode voltage 35 VDC  
Ref. Ground. The amplifier can  
not be used in bridged mono  
mode  
Output DC voltage  
5 mV  
All audio measurements, except frequency response, are measured with a 20KHz low-pass  
filter in accordance with AES-17.  
10  
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Protection  
Parameter  
Grounding  
Value  
Note  
Mains earth, chassis and audio  
ground are connected  
internally.  
Output short circuit current  
Output DC voltage  
Over-temperature  
40 A  
5 V @ <0.1 Hz  
All heatsinks and mains  
transformer  
Mains  
Parameter  
Value  
IEC 320 cold type  
100-120 VAC, 50–6 0Hz  
200-240V AC, 50-60Hz  
8 Amp  
4 Amp  
1.5 W  
35 W  
116 W  
820 W  
Note  
Mains input connector  
Mains voltage range  
Mains voltage range  
Internal mains fuse  
Internal mains fuse  
Power consumption  
Power consumption  
Power consumption  
Power consumption  
Mains lead supplied  
115 V version  
230 V version  
115 V version  
230 V version  
STANDBY mode  
OPERATE mode, no output.  
2 x 37.5 W/4 Ohms  
2 x 300 W/4 Ohms.  
Trigger  
Parameter  
TRIGGER IN connector  
TRIGGER BYPASS connector 3.5 mm (1/8") mono jack  
TRIGGER IN impedance  
TRIGGER IN sensitivity  
Value  
3.5 mm (1/8") mono jack  
Note  
Case=Gnd, Tip=Input  
Case=Gnd, Tip=Output  
10 Kohm  
4 VDC or 4Vp AC  
Positive DC voltage on Tip. AC  
> 50 Hz  
Max. input voltage  
25 Vp  
Mechanical  
Parameter  
Width  
Depth  
Value  
450 mm (17.72")  
340 mm (13.39")  
Note  
Excluding loudspeaker  
connectors.  
Depth  
361 mm (14.21")  
Including loudspeaker  
connectors.  
Height  
Height  
Net weight  
Shipping weight  
88.8 mm (3.5")  
100.6 mm (3.96")  
15.5 kg (34 lb.)  
17.5 kg (39 lb.)  
Excluding feet.  
Including feet.  
11  
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Technical assistance  
If you have any problems with or questions regarding your Lyngdorf Audio product, please  
contact Lyngdorf Audio or your nearest representative.  
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 Denmark  
Nordhavnsvej 12  
DK7800 Skive  
Denmark  
Phone:  
Phone:  
Fax:  
E-mail:  
Web:  
+45 46 91 10 90  
+45 86 27 75 00  
+45 86 27 45 00  
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