I went from Class D to Luxman A/AB - And most of what you think is wrong


Hi everyone,

As most of you know, I’m a fan of Class D. I have lived with ICEPower 250AS based amps for a couple of years. Before that I lived with a pair of Parasound A21s (for HT) and now I’m listening to a Luxman 507ux.


I have some thoughts after long term listening:
  • The tropes of Class D having particularly bad, noticeable Class D qualities are all wrong and have been for years.
  • No one has ever heard my Class D amps and gone: "Oh, wow, Class D, that’s why I hate it."
  • The Luxman is a better amp than my ICEPower modules, which are already pretty old.

I found the Class D a touch warm, powerful, noise free. Blindfolded I cannot tell them apart from the Parasound A21s which are completely linear, and run a touch warm due to high Class A operation, and VERY similar in power output.


The Luxman 507 beats them both, but no amp stands out as nasty sounding or lacking in the ability to be musical and involving.


What the Luxman 507 does better is in the midrange and ends of the spectrum. It is less dark, sweeter in the midrange, and sounds more powerful, almost "louder" in the sense of having more treble and bass. It IS a better amplifier than I had before. Imaging is about the same.


There was one significant operational difference, which others have confirmed. I don't know why this is true, but the Class D amps needed 2-4 days to warm up. The Luxman needs no time at all. I have no rational, engineering explanation for this. After leaving the ICEPower amps off for a weekend, they sounded pretty low fi. Took 2 days to come back. I can come home after work and turn the Luxman on and it sounds great from the first moment.


Please keep this in mind when evaluating.


Best,

E
erik_squires

Showing 4 responses by snapsc

If you have ever read the works of Nobel winning psychologist Daniel Kahneman, he devotes a lot of brainpower and ink to proving that people develop a process of thinking that usually makes it very difficult for them to accept change. Often, completely unbiased analytical data doesn't help with allowing someone to open their minds to the possibility that some process or product may be better. Therefore, we may be talking about the comparative aspects of Class D sound for a while.

Six years ago, I bought a Crown XLS 2000...a $500 Class D amp based on a TI chip.  It sounded darn good, solid and deep low end, big soundstage (width but with minimal depth), dynamic and decent but sibilant midrange and top end.

I replaced that amp with a Class A/AB Parasound Halo.  It was better in every respect...but still, pianos, trumpets and a few other things didn't seem quite right (and obviously, it could have been the speakers, dac, preamp, wires, etc.)

Then, two months ago I replaced the Halo with another Class D...which should elicit the question WHY a Class D of all things.  For exactly the reason that erik suggested...there isn't really a reason to be talking about amplifier classes so much anymore.

At any rate, I bought a 2Cherry from Digital Amplifier Company.  If you go to their website  https://www.cherryamp.com/dac-home   you will see that they are building Class D amplifiers unlike anyone else...bandwidth to 150kz...switching frequencies up to 2mghz...and they don't use modules from anyone else.  Their owner/engineer Tommy Obrien designs his own circuits and the builds his amplifiers from discrete components.  His stated goal is for his amplifiers to sound like nothing.  (Sounds a lot like the specs and statements from the well respected Class A and Class A/AB guys)


Tommy doesn't do paid advertising with anyone so one might assume that the professional reviews he is getting from the magazines might be a little more (skeptical, critical, harsh, etc.) less supportive...but in fact, they love his amplifiers.

Let me say this about the 2Cherry...in comparison to the Halo it replaced...What "shocks" you right away is the incredible level of transparency/clarity that seems to lift a fog that you didn’t know was there which brings the music alive. There is no sibilance, no brightness, no harshness, no artificially pumped up midrange and top end.  This amplifier brings you into a detailed, layered, powerful yet delicate soundstage with emotional involvement similar to a live performance.

I think we might all agree that the sound that moves us and the amplifier that brings us that sound is a personal preference...you prefer X and I prefer Y...and one of the beauties is that we have choices.  I'm with eric on this one; there is no longer a need to talk about Class D vs other classes...instead focus on what sounds best in your system and be open to the idea that it just might be a Class D amplifier.
@bigkidz

not sure if this is a reasonable price...size....or weight....but the 2Cherry with added rail capacitance...standard faceplate....standard gold binding posts....is going to be 14"w x 10" deep x4" high, weigh about 16lbs and cost you about $2700...give or take...with a 30 day trial period...easy decision for me....I didn't send it back.   

https://www.cherryamp.com/5-channel-amp

more spec info, etc. here

https://www.audiocircle.com/index.php?topic=162524.0
A couple more things about the cherry amps that I didn’t mention. 


1.  Most of their more detailed information seems to be located on their audio circle page... link at the bottom of their web page. 


2. You will find that the are willing to sacrifice some S/N for feedback and electronics changes that they perceive results in a more colorless sound. 



3.  The cherry amps have an absolutely black background.... silence through my loudspeakers with the volume turned up full. 


4.  They solved my piano, sax, trumpet and drums tone issue... they do tone beautifully 


Hope this clears a few things up.