http://news.bbc.co.uk/2/hi/uk_news/scotland/8368895.stm

[quote user="DrWho"] Btw, a CD source can contain at best only 96dB of dynamic range and it's usually going to be closer to 90dB. So in this example, if you're using a CD player for the playback source, the amplifier isn't going to be the limiting factor in loudest versus softest signal. It also doesn't help that digital noise floors tend to sound relatively nasty. Vinyl is going to be even worse, but it has the advantage of a much more pleasing sound to its noisefloor.

[quote user="DrWho"]Btw, what was the distortion of the Hypex at higher frequencies, like say 8kHz? [/quote] Here is the AP plot of the Hypex/UcD showing the low THD trial I mentioned earlier. Not a very clear image..... At 8 kHz it is 0.004% THD. Keep in mind--this is not the model now in production--just a sort of 'look how low it can go' version. The sound quality is better with the production version--even though THD is not reportable as quite so low.

[quote user="DrWho"]And for those looking to make your ears bleed, we've got some plans in the making for a 10,000W version as well... [/quote] These guys do some high power Class D: http://www.d-amp.com/serie_hvi.htm I have no idea how good they are...... Mark

[quote user="DrWho"]Btw, what was the distortion of the Hypex at higher frequencies, like say 8kHz? I just got finished digging through all my measurements and couldn't find the Hypex plots...which means they're on the computer in the lab at school (and I've since graduated...). We also inadvertantly shorted the output of the Hypex we had on hand, which makes it kinda hard to measure now... The final implementation of our amp was measuring under 0.03% distortion at all frequencies

[quote user="DrWho"] The distortion in the output inductor comes from the fact that your inductor is dissipating the high frequency switching noise and becomes partially saturated....once this happens, it affects all frequencies. Without the output inductor, a good class D amp could easily be pushing under 0.001% THD. Though as a consequence of the output filter saturation, you can actually reduce the distortion through the inductor by simply turning down the power rails. The other nice

[quote user="mdeneen"]"They just don't sound good." — Bob Carver, speaking in this month's TAS. Check it out. He's a guy that does know a think or two about amps. [/quote] There are good and bad amps in any class. I would be cautious of The Absolute Sound--they gave a poor quality Class D amp (Nuforce) "Amp of the Year" in 2005.....? Why would you trust their judgement? Good Class D amps (Hypex, CIAudio, Kharma, maybe Halcro, a few others) are competitive

[quote user="DrWho"]The only problem with Class D done correctly is the distortion introduced by the inductor in the output filter. Though nobody ever complains about the inductors in their passive crossovers... [/quote] Mike, Your reported Hypex output filter/frequency problem indicates a problem with that amp....or the measurement set-up. I know you mentioned it last October but never saw the promised measurements. I assume this is the same? The output impedance of the Hypex is about

The MR-1s slightly bigger brother, the MR-1000, has been voluminously discussed in pro recording forums since hitting US shores c. April 2007. Mainly quite favorably. There was a question in the other recent Korg thread about burning an SACD from the MR-1 DSD file: you can not, must create a Scarlet Book file and have it pressed--really not feasible. But.....see here: http://www.ps3sacd.com/dsddiscguide.html here: http://taperssection.com/index.php/topic,89333.0.html and here: http://www.ps3sacd

[quote user="colterphoto1"] PWK had a pilots license and used to fly around the country to sell his products. It would not have been terribly unusual for him to 'set up' a set of Klipschorns for a customer.[/quote] In 1958 Bill Bell (owner of the Wellesley Music Box) and Don Davis (then--I believe--V.P. of Klipsch) took a pair of Klipschorns and Marantz amps to the World's Fair in Brussels to demonstrate.....Stereo. Bell knew PWK. So the basic story of PWK helping him with an