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General Asylum General audio topics that don't fit into specific categories. |
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General Asylum General audio topics that don't fit into specific categories. |
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In Reply to: Not to rain on the parade.... posted by Beef Guinness Cutie Pie on April 15, 2015 at 09:16:15:
Here are a few additions to the review that may be of helpful given the questions raised:
The SDS-470C puts out at least 320 watts into an 8 ohm test load at 1kHz and more then 600 into 4 ohms before visible waveform clipping was seen on an oscilloscope. I don't have enough load resistors to measure both channels simultaneously at those levels, but the power supply should be able to do well enough to meet the manufacturer's specifications. The amplifier was stable driving four 8 ohm subwoofers in parallel for an effective 2 ohm load. The subwoofers are based on the Acoustic Elegance SBP-15s in 6 cubic foot sealed enclosures and reached higher levels than most sane listeners would even attempt. It is a very powerful amplifier.
Operating AM and FM tuners near the amplifier reveals no problems, so RF output seems to be reasonably low.
The Marantz SR-7009 served as the source for most of my listening and sounds great. The Audyssey MultiEQ XT-32 room correction offered by the Marantz allows the bass to be better evaluated in my particular system and is my preference for critical listening. Some auditioning using the Oppo BDP-103 and its volume control as the direct source confirmed my impressions with the Marantz. I don't routinely have a stereo preamplifier around any longer since transitioning to a combined music and home theater system. The internal amplifiers in the receiver are actually quite good with my Pi Speakers 6Pi cornerhorns, particularly when the low frequencies are handled by the four dedicated subwoofers.
Other power amplifiers that have been directly compared to the Class D Audio in my system include a Coda 4/3/2 (bridged and unbridged), Anthem PVA-7 and Emotiva XPA-200 and in a friend's system with an older Mark Levinson (? ML-22) driving Magnepan MG-1.7s. None of these were better than the SDS-470C in any substantial way and all except the Emotiva cost much more. The Mark Levinson may be for sale soon according to my friend! Strictly used as a subwoofer amplifier, the SDS-470C gives up little to even the most powerful professional and plate amplifiers that I've experienced. It is taunter, better defined, electrically quieter and makes no mechanical noise - no cooling fan and no transformer hum.
I've always taken a very hands-on technical approach with audio and video equipment and appreciate a high level of performance. The Class D Audio SDS-470C is an example of what good engineering can do and offers great value.
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Follow Ups
- RE: Not to rain on the parade.... - rkeman 18:35:56 04/15/15 (0)
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