Lyngdorf SDA 2175

[Κώστας Φ.]

The Lyngdorf SDA-2175 is a "semi digital" (more on that later) power amplifier rated at 200 watts per channel @ 8 Ohms and 375 @ 4 ohms. The retail price is $1,800.

It has fully balanced gold plated XLR inputs and regular RCA gold plated inputs as well. As you can see, there is nothing unique in the Lyngdorf's appearance, though it does come in either silver or black. The front panel sports and on/off button and two pale green lights - on that indicates power on and the other shows "operate" when the amp has finished its delayed startup/safety check routine. We normally save additional claimed specifications for the end of the review, but they are so significant that we will publisher them here:

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
Frequency response -0.2dB/+0dB 20 Hz – 20 kHz, 4 Ohms load
THD+N, 1 W /8 Ohms 0.004% A-wgt.
THD+N, 1 W/4 Ohms 0.006% A-wgt.
THD+N, 100 W/8 Ohms 0.01% A-wgt.
THD+N, 180 W/8 Ohms 0.07% A-wgt.
THD+N, 275 W/4 Ohms 0.07% A-wgt.
S/N ratio 117 dB A-wgt. ref 200 W/8 Ohms.
Channel separation 84 dB 1 kHz, 200 W/8 Ohms.

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LYNGDORF ON THE SDA 2175

"The SDA 2175 is a high-performance semi digital amplifier designed without compromise. It acts as a controllable slave amplifier in Lyngdorf Audio active speaker systems or as a power amplifier for external pre-amplifiers."



"Peter, why is the amp called "semi digital"?



"The output stage uses Pulse Width Modulation with a patented switch speed optimization technology. This ensures a low natural distortion, and an unmatchable performance is achieved by using less feedback than other Class D amplifiers. Careful and sensitive design touches can be seen throughout the amplifier: it starts at the mains input with a low-noise Holmgren Toroidal transformer with power supply feed-forward compensation, suppressing the variations in the output rather than relying on feedback-based error correction as in conventional amplifiers. This technique originates from the design of the Millennium, but can also be used in semi digital amplifiers.

The SDA 2175 employs a fully-balanced topology. If the switchable input is driven from a balanced source the signal is kept balanced all the way through the amplifier to the PWM conversion stage. This guarantees a remarkable performance with a signal-to-noise ratio superior to any other Class D amplifier in the market. In the critical output stage only the highest quality components have been used, e.g. polypropylene capacitors and linear ferrite material in the output filter. Combined with other techniques this means the SDA 2175 benefits from low and frequency-independent distortion. Consequently wideband musical instruments can be reproduced without any added harmonics – any source will be recreated to sound the way it was recorded.

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At $1,800 and featuring balanced operation, the build quality and sound quality makes the Lyngdorf an outstanding value in a true high-end quality, powerful amplifier.

Be advised that the stereo amp is not bridgeable to use as a single mono amp. Other than that, we cannot think of any reason not to make the Lyngdorf 2175 a part of your system.


Περισσότερα: stereomojo.com