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REVIEW: Class D Audio SDS-470C Amplifier (SS)


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Model: SDS-470C
Category: Amplifier (SS)
Suggested Retail Price: $695
Description: Stereo Power Amplifier
Manufacturer URL: Class D Audio

Review by rkeman on April 14, 2015 at 19:28:34
IP Address: 67.8.25.5
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for the SDS-470C


The Class D Audio SDS-470C is a stereo power amplifier offering a potent 300 watts per channel into 8 ohm loads and twice that into 4 ohms. Read that again and be reminded that that precious few power amplifiers can manage this feat and those cost much much more. All this in a trim form factor that operates without producing significant heat, noise or fuss. How can it be?

It's a class D amp! That alone will send many audiophiles running - and it should not. Class D amplifiers have been around for quite some time now and a significant number of good quality examples have appeared. The SDS-470C is made by Class D Audio, a relatively new small manufacturer offering a variety of power amplifiers available fully assembled, as complete kits and as discrete modules and components, all at very attractive price points. The company appears to have had limited exposure in the audio community and their relatively simple website certainly lacks any glossy audiophile trappings or wild claims. Communications with the proprietor are uncomplicated and very informative. The products are produced right here in the USA.

The top-of-the-line SDS series is a half bridge self oscillating design based on International Rectifier output devices and backed by beefy linear power supplies. Facillities on the amplifier are basic - two red pilot lights on the front panel, a small rocker power switch on the side of the chassis, balanced (XLR) and single-ended inputs with selector toggles, volume pots and an IEC power socket in the rear. The build quality and appearance are reminicent of more expensive components. The steel casework has reasonable heft and the silk-screened front panel is attractive in an austere fashion. Not overbuilt, just well engineered. The electronic components are of high quality and the assembly appears to be first-rate.

So how does the SDS-470C perform? The sound is very effortless, a trait often associated with powerful amplifiers. The noise floor is very low and results in a "black" background that preserves musical detail. Part of this certainly results from the inclusion of volume controls. Amplifier gain can be set to match the preamplifier optimizing system noise performance. There is very little tonal coloration. Midrange and high frequency performance is comparable to high quality conventional class A/B amplifiers and bass is taugnt and controlled. Other have described Class D Audio amplifiers as having a "tube-like" sound, and if that means grain-free and transparent then the SDS-470C certainly shares that quality. Imaging and soundstage reproduction are limited only by the source material, loudspeakers and listening room. These characteristics seem independent of the loudspeaker driven, unlike some other class D designs.

In th final analysis, the Class D Audio SDS-470C provides excellent sound and blistering power in a relatively compact, cool running, and cost effective package. Highly recommended.


Product Weakness: None.
Product Strengths: Excellent sound and value.


Associated Equipment for this Review:

Amplifier: Marantz SR-7009 AVR
Preamplifier (or None if Integrated): As above and Oppo BDP-103
Sources (CDP/Turntable): Oppo BDP-103, Technics SL1200 Mk II
Speakers: Pi Speakers 6Pi, DIYSG Alpha 8a, Custom Subwoofers
Cables/Interconnects: Various Belden and Canare
Music Used (Genre/Selections): Classical and Pop
Room Size (LxWxH): 24 x 18 x 12
Room Comments/Treatments: Extensive including corner bass bins.
Time Period/Length of Audition: One month.
Other (Power Conditioner etc.): Brick Wall Surge protector
Type of Audition/Review: Product Owner



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