 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.
 "Semi Digital" is in Lyngdorf Audio terms a "digital" switching amplifier driven by an analog input.
In principle, the output stage of most switching amplifiers has the same working principle.
PWM = Pulse Width Modulation is simply a matter of variable open/close time of the transistors.
Simplified, you can compare the transistors in the output stage to two switches.
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The amplifier is fully balanced from input to output if driven with a balanced source, and if not driven with a balanced source, the signal is immediately transformed to a balanced signal.
The fully balanced design gives clear advantages regarding hum and noise suppression - also from other sources.
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| PARAMETER |
VALUE |
NOTE
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| 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 |
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| 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 |
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A-wgt. Ref. 200 W/8 ohms |
| Channel separation |
84 dB |
1 KHz, 200 W/8 ohms |
| Peak output current |
+/-40A |
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| 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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May 2008
Complete Lyngdorf System – CD-1, TDAI-2200 w. RoomPerfect, SDA-2175, DP-1, BW-1
Lyd & Bilde (Sound & Picture), Norway
“Lyngdorf gives you a taste of the sound of the future with the RoomPerfect system – a music system that really plays in tune with the listening room and, under optimum conditions, can match twice as expensive systems.”
“The dipole loudspeakers DP-1 have a quite special ability to disappear within the sound stage and leave a crystal clear midrange that brings out even minute details in the sound mix. The tweeter belongs to the fine-grained variety that does not stand out too much, unless required to, and it never becomes unpleasant to listen to.”
“Never before have I experienced such a light and fast, but still utterly solid and powerful bass in my living room as with the room corrected BW-1 subwoofers. The bass range is totally free of booms, resonances and other undesired effects that can mask the tones from a double bass and other instruments. And they go deep enough to reproduce the lowest tones from a church organ without problems.”
Read article:
http://www.lydogbilde.no/index.php?cat=79291&kategori=&testid=3933
Download article:
Lyd & Bilde (English) |
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2007
SDA-2175
http://www.stereomojo.com/, US
“Can the Lyngdorf rock? Absolutely! Led Zep, Stevie Ray, The Who and AC/DC were all well served with slamming snares and kickin' kickdrums. Electric as well as acoustic guitars were rendered with all attendant guts and gore or unamplified zing when necessary.”
“It is true that a picture says a thousand words - it's just that some say them so much better than others. The Lyngdorf is one of those.“ |
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September 2007
System test: DPA-1 / SDA-2175 / CD-1
STEROPLAY, Germany
STEREOPLAY of Germany had an almost complete Lyngdorf system: DPA-1, SDA-2175 and CD-1 for review, issued in October 2007. In the test team's own words the result was nothing less than “sensational”.
“The SDA-2175 revealed itself as an enormously powerful amplifier, easily capable of pushing the reference speakers to the limits of their dynamic range.”
“It is as made in heaven for powering passive subwoofers in a RoomPerfect controlled Lyngdorf system.” |
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May 2007
SDA 2175
Hifi & Musik, Sweden
The Lyngdorf SDA-2175 is being compared to four other Scandinavian amplifiers and outperforms up to three times more expensive competitors, like Densen B330 and Primare A30.2!
“Using the Lyngdorf is like connecting the loudspeakers directly to the wall outlet! The sound is crystal clear and pure, with an immaculate transient power and precision in details. It never sounds edgy or “digital” as we have so often experienced with other digital amplifiers. Instead the presentation of music is soft and lively in a most remarkable and so to say very self-assured fashion that makes other amplifiers sound diffuse and dull.
Conclusion of the group test:
“A really happy surprise – especially price wise – was the Lyngdorf SDA-2175. A more dynamic, crystal clear and finely chiselled sound quality will be difficult to find! The bass power and precision alone will be worth the full price of the amplifier!” |
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June 2006
SDA-2175
HI-FI WORLD, UK
“It didn’t take long to realise the SDA-2175 was masterful with classical music, an absolute first choice for anyone upset by the unhappy coupling of violin and transistor. Kettle drums sounded convincingly large and sonorous, if not thunderous. There was a nice push from the brass section of the Philharmonia, and I noticed the same as massed violins of the London Symphony Orchestra reached a crescendo with Rachmaninov’s Piano Concerto No2.The amplifier has real midband shove; it’s very lively and say: I felt it was smooth, truthfully dynamic and possessed an evenness that was both unusual yet also very relaxing.” |
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May 2004
SDA 2175
Audiophile.no, Norway
Link to article:
Audiophile.no
Audiophile.no - translation |
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