Lyngdorf TacT SDAI-2175 amplifier

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 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 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.

 

Specifications

Balanced Input Connectors:  3 pin XLR, gold-plated.

Balanced Input Impedance:  10 k Ω   (AC-coupled)

Balanced Input CMRR:  40 dB (20 Hz - 20 kHz)

Unbalanced Input Connectors:  RCA (phono) jack, gold-plated

Unbalanced Input Impedance:  100 k Ω  (AC-coupled)

Tape Out Output Impedance:  75 Ω   (Gain 0  dB ref. active input)

Pre Out Output Impedance:  75 Ω   unbalanced; 100  balanced (Gain According to volume control setting. 88 dB = 0 dB with sensitivity 0 dB and rel. Volume 0 dB)

Max. Input Voltage:  ±12Vp AC, 0 - 20 V DC.

Input Sensitivity:  2 V (1V with high sens.) 200 W/8 Ω 

Voltage Gain:  26 dB

Output Connectors:  4 insulated binding posts, goldplated. (Will accept bare wire ends of up to 5 mm diameter)

Output Power (8 Ω ):   2 x 200 W (1KHz, 1% THD+N)

Output Power (4 Ω ):   2 x 375 W (1KHz, 1% THD+N)

Nominal Load Impedance:  4 Ω  - 8 Ω  (It is safe to operate the amplifier with no load)

Frequency Response:  0,3 Hz - 33 kHz (-3 dB points, 8 Ω  load)

Frequency Response:  -0 dB /+0,2 dB (20 Hz - 20 kHz, 8 Ω  load)

Frequency Response:  -0,2 dB / +0 dB (20 Hz - 20 kHz, 4 Ω  load)

Output Impedance:  0,035 Ω   (20 Hz - 1 kHz)

Output Impedance:  0,4 Ω  (20 kHz)

THD+N, (1 W/8 Ω ):   0,004% (A-wgt.)

THD+N, (1 W/4 Ω ):   0,006% (A-wgt.)

THD+N, (100 W/8 Ω:  0,01% (A-wgt.)

THD+N, (180 W/8 Ω:  0,07% (A-wgt.)

THD+N, (375 W/4 Ω:  0,07% (A-wgt.)

Signal-to-Noise Ratio:  113 dB (A-wgt. Ref. 200 W/8 Ω )

Channel separation:  84 dB (1 kHz, 200 W/8 Ω )

Peak output current:  –40 A

Output Common Mode Voltage:  35 V DC (Ref. Ground. The amplifier can not be used in bridged mono mode)

Output DC Voltage:  ±5 Mv

Output Short Circuit Current:  –40 A

Output DC Voltage:  –5 V at <0,1 Hz

Over Temperature:  All heat sinks and mains-transformer.

Mains Input Connector:  IEC 320 cold type (Mains lead supplied)

Mains Voltage Range:  100 - 120 V AC, 50/60 Hz (115 V version)

Mains Voltage Range:  200 - 240 V AC, 50/60 Hz (230 V version)

Internal Mains Fuse:  8 Amp (115 V version)

Internal Mains Fuse:  4 Amp (230 V version)

Power Consumption:  1,5 W (STANDBY mode)

Power Consumption:  35 W (OPERATE mode, no output)

Power Consumption:  116 W (2 x 37,5 W/4 Ω)

Power Consumption:  820 W (2 x 300 W/4 Ω)

Dimensions (W x H x D);  450 x 100 x 355 mm (17,72" x 3,94" x 13,98")

Weight:  13 kg (28,66 lb)

 

Lyngdorf DP-1 loudspeakers

The naked truth

The DP-1 is yet another boundary breaker from Lyngdorf. We have solved the problem of cabinet induced distortion by simply removing the cabinet!

DP-1 is an open dipolar design that radiates sound both forwards and backwards. In this way we obtain a perfect sound radiation pattern and avoid all cabinet-induced coloration of the upper bass and midrange.

Thanks to highly advanced drivers and the absence of a box the DP-1 has a remarkably airy, neutral and extremely detailed music quality. It combines pure sound as known from the very best electrostatic speakers with the power capability of dynamic speakers. The result is the very best from both worlds – a truly brilliant solution!

The stylish speaker has been designed for frequencies above 300 Hz and for cooperation with a BassDirect speaker like BW-1 or the larger W-210 from Lyngdorf. Of course it performs the best in a complete Lyngdorf system where all acoustical parameters are under full control.

 

The extraordinary drivers are specially customized for the Damping Factor-1. the ScanSpeak tweeter has a 1" textile dome which has been coated several times to achieve the exact desired combination of dynamic linearity and resonance damping. The ingenious magnet structure practically eliminates electrical phase shifts and distortion. The result is an incredibly smooth, linear, dynamic and amazingly transparent sound.

The 6,5" Seas woofer is extremely advanced; both the diaphragm and the chassis are made of magnesium. This ensures a minimum of break-up in the cone and a completely nonmagnetic chassis that concentrates the force of the magnet around the voice coil. The unit has a solid metal center plug instead of a traditional dust cap. That makes the cone lighter and faster and eliminates unwanted air pressure behind the cap. Furthermore it provides extra cooling for the voice coil which increases power handling and sonic stability at high volume levels.

The front baffle of the Damping Factor-1 is made of seven layers of MDF board glued together to shape the solid 55 mm thick profile that provides optimum acoustic properties for the drivers. It has a beautiful piano finish comprising of no less than 10 layers of lacquer, each hand polished to a deep, black, glossy shine.

 

Specifications

Loudspeaker Type:  Dipolar, no cabinet type

High Frequency Driver:  1" dome tweeter

Woofer/Midrange Driver:  6,5"

Crossover Frequency:  2,0000 Hz

Frequency Response:  300 - 22,000 Hz

Sensitivity:  89 dB (2,83 V/1 m)

Nominal Impedance:  4 Ω

Maximum SPL:  112 dB

Finish:  Black piano lacquer

Dimensions (W x H x D):  282 x 1069 x 371 (91 w/o foot) mm

Weight:  20,9 kg