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Price: $595.00
Product ID : SDS-250C
Manufacturer: Class D Audio USA
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Complete custom built SDS-250C audio amplifier featuring our SDS-250 Class D Audio amplifier. 125W RMS X 2 into 8 Ohm and 250W RMS X 2 into 4 Ohm, also can be bridged into a single channel amp providing 500W RMS X 1 into 8 ohm. Single ended inputs, balanced inputs, rear mounted gain controls and more.. Our newly designed case with mini-textured powder-coat finish and brushed anodize front in either black or silver. This amplifier features one of the finest balanced XLR input stages available and also single ended RCA jacks. Either of these inputs can be selected by a switch on the back of the amplifier. You will also see it has adjustable gain control for each channel that are also rear mounted. These can be used to adjust the amp to match output of your other equipment such as matching to the sweet spot of your preamp. They can also be used to setup and balance your room for best performance. Size is12" X 12" X 3.5". Shipping weight 18 pounds.

Model SDS-250C
Number Of Channels 2
RMS Power Per Channel 8 Ohms 125W RMS X 2
RMS Power Per Channel 4 Ohms 250W RMS X 2
RMS Power in Bridge Mode 500W Into 8 Ohm Only
Input Sensitivity 2V
Total Harmonic Distortion (THD) Better than .02% (normal listening is about .003%)
Frequency Response 10hZ to 35KHz
Input Impedance RCA 10K
Input Impedance XLR 45K
Voltage Gain for RCA Input Adjustable
Voltage Gain for XLR Input Adjustable
Power Requirements 110VAC or 230VAC
Dimensions (W x H x D) Inches 12" X 3.5" X 13"
Dimensions (W x H x D) Millimeters 304.8 X 89 X 331.5
Product Weight (lbs/kg) 18
Shipping Weight (lbs/kg) 20
Manufacturer Class D Audio

Product Reviews

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Reviewed by customer
08/15/2016 - 11:29:02 AM
A Bargain At Ten Times The Price!
I've been listening to my SDS-250C for little over a month now but held off writing this review until I got around to hooking up the SDS-250C to my PRE/DAC with balanced interconnects.

You may have already read plenty of reviews out there praising the amazing sound quality of Tom's Class D amplifiers and it’s all true but let me be clear, if the reviewer(s) did not bother to listen to this amp with balanced interconnects you are not getting the full picture

The balanced input stage that Tom has chosen for the SDS series is simply AMAZING and truly highlights what these little wonders are capable of. The sound stage expands to EPIC proportions and the presence is well, just indescribable. Simply put, you are probably not going to find a better Class D amplifier for any amount of money anywhere that will put such a BIG smile on your face and impress your Audiophile friends as much as the SDS series amps.

The SDS-250C can drive demanding speakers without breaking a sweat and pairs beautifully with my Maggie’s and have plenty of power to spare!

Thanks Tom, keep up the great work!

Ajax, Ontario Canada
Reviewed by customer
08/15/2016 - 11:28:13 AM
A fine amp for audio recording!
Recently I purchased a pair of second hand Merlin TSM MMi speakers. Like the PMC TB2’s I had 6 years ago these speakers are similar in that imaging, sound stage, and clarity are top notch for bookshelf speakers, but bass response can be somewhat limited depending on room size and bad recorded or compressed music…well can sound bright and bad. I guess matching an amp with speakers can be tricky but also fun sometimes.
For me I have tried a few amps (Yamaha, Onkyo, Brio, Cambridge, and Nad). Hands down the most accurate amp was the class D Audio SDS-250C. Tons of power, accurate sound stage, great imaging, warm, and good amount of air in the upper range. In terms of accuracy this amp is top notch, unfortunately in my set up the amp is tad bright (revealing would probably be a more accurate term). This amp paired with the Merlin speakers sounds fantastic for well recorded music, but for content that is MP3 or TV shows (a lot of times compressed), and electronic music (techno and ambient chill out) the amp reveals to many flaws. I guess that is not a bad thing. In terms of audio recording and studio monitoring I think this amp would be fantastic (especially with PMC or Dynaudio). Over the years I have learned that I actually enjoy a somewhat recessed midrange, with big sound stage, lots of bass (even at low listening volumes), and great imaging. The NAD while not as transparent as your amp actually better serves all of those qualities. The big issue with my listening environment and my Merlins is that I really do need a bass tone control and my girlfriend has to have a remote. I guess if I was still into audio recording this amp would be my choice. For my casual listening preferences this amp is bright for my preference, actually its probably neutral, but I do like my sound a little darker…maybe masked in way.
I highly recommend this amp if you are into audio recording and want to hear exactly how your music was recorded. If you have larger floor standing speakers that have alot of low end extension I also recommend this amp. PMC monitors use to use Bryston monoblocks amps, then switched to flying mole amps (digital), but flying mole went out of business. I think the Class D SDS 250C is a fine replacement.