REF1000M Monoblock Amplifier Features. As I have explained in the past, removing this noise with the filter allows me to see overshoot and ringing, which I regard as significant. According to John Stronczer, “There was a 10dB drop in noise going from Tripath to ICEPower. Do the Hypex based amps use output filters at all before the speaker output terminals? I still occasionally show class-D amplifier squarewaves with and without the low-pass filter. And by expressing that opinion, all you are doing is revealing your own lack of insight, I am afraid. JA you never used to use this bench test filtering with Class D's, and in the past we got to see just what was coming out of these Class D speaker outputs.

But in 1998, John Stronczer, Bel Canto’s chief designer, began to investigate switching amplifiers. Bel Canto uses proprietary low-noise amplifiers with precision film resistors and capacitors to filter out high-frequency noise and prevent its aliasing within the audio band. I was interested to note that Bel Canto has chosen not to include their own power supply, as they did with the ICEpower-based REF1000M—which probably accounts for the REF600M's lighter weight. This is not to say that the REF600Ms lacked subtlety. Note that I always note the level and center frequency of a class-D amplifier's switching noise. But without the filter, all you see is a wave with a large amount of RF noise on the tops and bottoms. These differences must affect the sound quality, but to link them with what I heard will take testing procedures that control more variables than I can. The REF600M is also DC-coupled to avoid any dynamic degradation brought by coupling capacitors. I couldn't help noticing that the power-output specs of the REF600M monoblock—300W into 8 ohms, 600W into 4 ohms—are identical to those of the MPS1, suggesting that they share similar NCore and power-supply components. I don't know, but the amplifier boards aside, I could see physical differences inside these three amps. Once this happens, our treasured big, hot, heavy, inefficient linear amps, will become door stops or boat anchors.
It never ran out of steam with any sort of music at any listening level, and remained absolutely consistent in tonal balance and clarity. "Some linear amps have HF output filters if they're subject to oscillating, but I have found that if the linear amp is unconditionally stable there is no need for themAnd yes all Class D's I know have a gentle (so it won't burn out) passive high wattage output filter, if not they would fry your speakers in a micro second.But this filter can't filter out all the switching noise without totally effecting the audio band, this is why you'll see the remminance of that noise as the dreaded sawtooth ringing noise all across the top of a test square wave, some much more than others.The Audio Precision's auxiliary AUX-0025 passive low-pass filter that JA uses goes between the class d amp speaker outputs and the measurement device, which eliminates most all of the switching noise, so you don't see it or measure it anymore. "Do most none Class D Amps use output filters in general? A version of this NCore technology was chosen for application in Bel Canto’s current flagship Black power amplifiers, which were introduced in 2015—essentially a custom version of the NC1200 amplifier with the gain stage removed, replaced by a Bel Canto discrete gain stage.The Bel Canto REF600M is the first amplifier in the REF series to use the NCore technology.

Stronczer designed and implemented external power filters and low-noise rectifiers as well as proprietary input stages in a compact, rigid chassis to improve the basic performance of the core ICEPower device. Note, too, that while the power specs of the REF600M and Black are similar, the earlier REF1000M has a bit more oomph , at least on paper. Of three recent amps of my experience, the REF600M was the warmest, the NAD Masters Series M22 the most detailed, and the Theta Dreadnaught D somewhere in between. Last year, Michael Fremer reviewed Bel Canto's nearly all-digital In Gerald Finzi's "Come Away, Death," Marianne Beate Kielland's mezzo-soprano was nicely balanced and of appropriate depth, while the sound of Sergei Osadchuk's piano was full but a bit lacking in Why should various amps based on circuit boards of the same technology (NCore) and made by the same company (Hypex) sound different? The REF600M is also DC-coupled to avoid any dynamic degradation brought by coupling capacitors.


The Bel Canto Orfeo SE2 power amplifier was a two-stage amplifier that used a triode input stage and one 845 triode output stage with local degenerative feedback and no global feedback.

So, even taking into account the fact that a basic power amp such as the REF600M has no need for the MPS1's digital inputs and DAC, the new amp's price is eye-openingly low. The balanced input impedance was 77k ohms. Has it really been more than seven years since I reviewed Bel Canto's Our initial choice was from a company called Tripath.”In 2000, Bel Canto introduced its first switching amplifier, as part of the Evo line that included both stereo and multichannel models. Theta and NAD use the input circuit on the NCore amp board, while Bel Canto supplements it with a proprietary circuit. The REF600M’s output impedance, including 6’ of cable, was low, at 0.1 ohm from 20Hz to 20kHz.

Made in Minnesota, the cool-running and wide-bandwidth Bel Canto e.One REF600M monoblock amplifier outputs serious power (300Wpc into eight ohms, 600Wpc into four ohms) and operates with such quiet that it can easily drive even the most sensitive speakers without any issue. I’ve measured at least a 10dB drop in distortion, especially at high frequencies, going from ICEPower to NCore. Well JA I still like to see what's trying to ultrasonically fry my tweeters/ears.

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