Yamaha MX-D1 digital power amplifier Associated Equipment

Sidebar 2: Associated Equipment

Analog Sources: Simon Yorke S7, Brinkmann Balance turntables; Immedia RPM, Graham 2.2, Brinkmann 10.5 tonearms; Lyra Titan, Lyra Helikon, Dorian mono, van den Hul Condor cartridges.
Digital Sources: Musical Fidelity Tri-Vista SACD player, Alesis MasterLink CD recorder.
Preamplification: Manley Steelhead, Whest PhonoStage .20 phono preamplifiers; Musical Fidelity kWP preamplifier.
Power Amplifiers: Musical Fidelity kW monoblocks.
Loudspeakers: Verity Audio Sarastro, Wilson Audio WATT/Puppy 7.
Cables: Interconnect: AudioQuest Cheetah & Sky, Harmonic Technology CyberLight LAM Photon Transducer. Speaker: Harmonic Technology Magic Woofer & Tweeter. AC: Shunyata Research, JPS.
Accessories: Sounds of Silence Vibraplane active & Gingko Audio isolation platforms, Symposium Acoustics Ultra platform, Finite Elemente Pagode equipment stands; Shun Mook Audio LP Record Clamp, Locus DampClamp, Hagerman Audio UFO clamp/strobe; Audiodharma Cable Cooker; Walker Audio Precision Isolated Power Motor Drive; Shunyata Research Hydra 2 & Hydra 8 AC conditioners; ASC Tube Traps, RPG BAD & Abffusor panels.—Michael Fremer

6600 Orangethorpe Avenue
Buena Park, CA 90620
(714) 228-3343

georgehifi's picture

"so to examine the MX-D1's performance at low signal levels, I used an active sixth-order low-pass filter with a 20kHz bandwidth and a floating input."

Wow, with this almost brick wall filter territory at 20khz on it's output and you can still see the switching noise embedded in the square wave. https://www.electronics-tutorials.ws/filter/fil57.gif
Would have been eye popping to see it au naturel, an unrecognizable square wave most likely

"so I caution readers (and Yamaha) not to take the specific graphs as representing anything more than broad-brush pictures of the amplifier's behavior."

Pretty useless having these graph shots if they don't represent what coming out of the output of these Class-D's for readers to see what being fed to their speakers.
There never used to be a problem measuring with the AP gear showing the results without filter when Class-D was first being measured, like with the Anthem M1 Class-D

Cheers George