2. amps-preamps
  3. 129071-76532

Class D = Trash?

So, I'm on my second class D amp. The first one, a Teac AI-301DA which claimed to use an ICE module, was unlistenable trash. I burned it in for a few weeks, it just couldn't perform, so I sent it back. Following that, I tried the new Emotiva A-300 (class A/B). It was significantly better, but lacking in too many ways for my tastes. So I changed gears, got an 845 SET from China -- and it was an immediate and massive improvement.

So, before I went further down the SET road, I wanted to try a better class D product using a modern class D module. I settled on the D-Sonic M3-800S with the Pascal module and custom input stage. I read from reviews that these things like to have big cables, so I picked up an eBay 8 gauge power cable (Maze Audio, el-cheapo Oyaide copy plugs, braided 4-wire cable) to go along with it.

Mid-range GONE.
Soundstage depth CRUSHED.
Euphonics DISAPPEARED.

Yes, resolution went up. Driver control went up, allowing me to play compressed rock/pop and orchestra with the speakers being able to render it all. But enjoyment in the sound is basically gone. Using my best power cable (LessLoss Original) improved performance, but didn't fundamentally change the amp's nature. I ran back to my headphones (Focal Utopias) to detox my ear canals.

So, how long does a class D need to burn-in? I want to give it a fair shake before writing the technology off forever. 
madavid0
audioman58's avatar
audioman58
4,188 posts
 
Look at Merrill Audio .they make Excellent amplifiers, and use Very good parts quality.I owned Mcintosh very dissapointmrnt wima caps donot belong in a $6k  amplifier I put Mundorf  supreme a Big improvement as well as resistors,wiring.
Class D  has nany variations, and   have their own implementations of class D.
Can compete with class A AB amplifier without exception. And a money back option I believe .I have them several times .I am going to purchase one myself.
I do recommend like myself a Very good custom Vacuum tube preamp 
Myself DHT  preamps are superior in Several ways 1 stage vs several in a conventional preamp.  The Russian 4P1L a fantastic most linear tube out there
As long as you have a veteran over 20 years in Vacuum tube design such 
as Radu Tarta, and the buyer chooses the quality of the parts choices. Far better 
Then most commercial average at best parts. 
phd
1,320 posts
 
I don't think there is a specified time for Class D to break-in. If there is and it would vary from one manufacturer to another should be mentioned in the manual. What we do know is that the longer they are powered up, the better they sound. The most important thing to keep in mind as they do require a lot of experimentation with different interconnects and power cables to sound their best and patience will prevail.
toddverrone's avatar
toddverrone
840 posts
 
@phd that's interesting you find class D weak in the bass without an analog power supply. I've found class D to absolutely kick booty in the bass department with the normal switching power supplies. 

Is there anything consistent in audio?!
timlub
2,040 posts
 
One of the amps that I own, I made from Abletec mono modules, put 2 in a single chassis..... It took and initial 400 or so hours to break in and still continued to improve beyond 1000 hours.  I don't listen to this amp much, but none the less, it is no slouch.  Good bass, smooth midrange through the top end,  good detail... I like a few others better, but this is an amp does nothing objectionable and most could easily live with. 
phd
1,320 posts
 
Toddverrone, ah yes you could be right but somehow wyred4sound has managed to engineer the bass out of their amps. What I can say with confidence is that an analog power supply in class D does give you that full sound that class a/b amps posses.
More to discover