Lyngdorf SDA 2175 stereo power amplifier


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The SDA 2175 is a high-performance power amplifier designed without compromise. It can act as a controllable amplifier in Lyngdorf systems or as a power amplifier for conventional pre-amplifiers. The SDA 2175 is not your regular class D power amplifier. The output stage uses Pulse Width Modulation with a patented switch speed optimization technology. This ensures a low and linear natural distortion, and an unmatchable performance is achieved by using less feedback compared to typical Class D amplifiers. And the fully balanced signal path all the way through the amplifier to the PWM conversion stage guarantees a remarkable performance with a signal-to-noise ratio superior to any other Class D amplifier in the market! 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 normally used. This feed-forward technique originates from the design of the Millennium - the Lyngdorf state-of-the-art true digital amplifier. 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 results in low and frequency-independent distortion. Consequently wideband musical instruments can be re-played without any added harmonics - any source will be recreated to sound the way it was recorded. Output power, 4 ohms 2 x 375 Watt 1KHz, 0.1% THD+N Output power, 8 ohms 2 x 200 Watt 1KHz, 0.1% THD+N Nominal load impedance 4 - 8 Ohms Frequency response 0.3Hz-33KHz -3dB points, 8ohms load. Frequency response 20Hz-20KHz -0dB/+0.2dB, 8ohms load Output impedance 0.035 Ohms 20Hz-1KHz Output impedance 0.4 Ohms 20KHz THD+N 0.004% @1W/8 ohms A-wgt. THD+N 0.006% @1 W/4 ohms A-wgt. THD+N 0.01% @100 W/8 ohms A-wgt. THD+N 0.07% @300 W/4 ohms A-wgt. S/N ratio 117dB A-wgt. Ref. 200 /8 ohms Dynamic range A-wgt. Ref. 200 W/8 ohms Channel separation 84 dB 1 KHz, 200 W/8 ohms Peak output current +/-40A Mains voltage range 100-120V AC, 50-60Hz 115 V version Mains voltage range 200-240V AC, 50-60Hz 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 Ohms Power consumption 820 W 2 x 300 W / 4 Ohms Width 450 mm / 17.72in Depth 355 mm / 13.98in Incl. loudspeaker connectors Height 100 mm / 3.94in Including feet Net weight 13 Kg / 28.6 lb Shipping weight 15.7 Kg / 34.5 lb


Output power: 4 ohms 2 x 375 Watt  1KHz, 0.1% THD+N

Output power: 8 ohms 2 x 200 Watt     1KHz, 0.1% THD+N  

Nominal load impedance:     4 - 8 Ohms  

Frequency response:  0.3Hz-33KHz -3dB points, 8ohms load.

Frequency response:  20Hz-20KHz -0dB/+0.2dB, 8ohms load

Output impedance:  0.035 Ohms   20Hz-1KHz

Output impedance: 0.4 Ohms 20KHz

THD+N  0.004% @1W/8 ohms    A-wgt.

THD+N 0.006% @1 W/4 ohms    A-wgt.

THD+N 0.01% @100 W/8 ohms    A-wgt.

THD+N 0.07% @300 W/4 ohms    A-wgt.

S/N ratio: 117dB A-wgt. Ref. 200 /8 ohms

Dynamic range:  A-wgt. Ref. 200 W/8 ohms

Channel separation: 84 dB 1 KHz, 200 W/8 ohms

Peak output current: +/-40A     

Mains voltage range: 100-120V AC, 50-60Hz    115 V version

Mains voltage range: 200-240V AC, 50-60Hz  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 Ohms  

Power consumption: 820 W  2 x 300 W / 4 Ohms

Width:  450 mm / 17.72in    

Depth:  355 mm / 13.98in  Incl. loudspeaker connectors  

Height:  100 mm / 3.94in  Including feet  

Net weight:  13 Kg / 28.6 lb    

Shipping weight:  15.7 Kg / 34.5 lb 

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*We ship free of charge to mainland UK addresses, excluding the Scottish Highlands or 'Out-Of-Reach' Scottish locations. Please consult the post-codes below to see if your location falls within this category. If you are still unsure, please contact us on 01432 354921. We also ship to Northern Ireland, Channel Islands, Scilly Isles, Scottish Isles and Scottish Highlands, however delivery to these locations will incur a charge and can only be sent via a 2-day service.

Shipping CostsMainland UK (Next-Day)Offshore/Out-of-reach (2-day)Northern Ireland, Channel Islands, Isle of Man, Scottish Islands, Scilly IslandsRepublic of Ireland (2-day)
Under £50 Orders £7.50 £12.50 £15.00
Over £50 Orders FREE £19.99 £29.99
Surcharge Orders £50.00 £69.99 £79.99
Saturday Delivery £12.99 N/A N/A
Sunday Delivery £12.99 N/A N/A
Saturday by 12 Delivery £35 N/A N/A


Post codes exempt from the free delivery service include:

Scottish Highlands Post Codes: AB30-38, AB41-42, AB44-56, FK17-99, G83, IV1-28, IV30-39, IV52-54, IV63, KW1-14, PA21-33, PA34-40, PH15-26, PH31-41, PH49-50
Islands Post Codes: HS1-9, IV40-51, IV55-56, KA27-28, KW15-17, PA20, PA41-49, PA60-78, PH42-44, ZE1-3
Northern Ireland: All BT postcodes
Channel Islands Post Codes: JE, GY
Scilly Isles Post Codes: TR21, TR22, TR23, TR24, TR25