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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
geoffkait's avatar
geoffkait
23,365 posts
 
Quick interrupt! Here are some things you can’t measure. We have a lexicon of audiophile terms that most people understand. That’s how we communicate.

Transparency
Soundstage height
Air
Wetness
Sweetness
Presence
Beauty
Grain
Congealed
golfnutz
231 posts
 

@tweak1 

By my estimate, the Icepower 1200as2 is around the $300 price per module. For the money, it's pretty good. Not so good for inefficient speakers though. All connectors on the 1200as2 are JST, using tin. I've had every single connector connected directly to the board (power/input/output), also using a high quality fuse. There was ZERO difference between direct/indirect connections. This is not a high current amplifier. My SS amp is much more dynamic and louder at a much lower volume setting. I'm afraid I agree with what Georgehifi has been trying to tell everyone (at least for lower priced class D).

mapman's avatar
mapman
22,288 posts
 
Golfnutz you are drawing conclusions based on way insubstantial evidence.

There are in fact many high current Icepower based Class D amps out there and have been for years.

I own two: the BEL Canto ref1000m and the C5i. Look em’ up. I’ve used these with great results with various power and current hungry monitors and full range floor standers including Dynaudio, KEF, and OHM.

I also own a third newer (Fosi) that is a minimal design built around a TI Class D amp chip that only cost $85 and still sounds great with a pair of limited range small monitors (refoamed vintage Boston A40s...very nice). I don’t expect anything at that price to be able to drive a very difficult load but I suspect this one is also at least very efficient and probably can at least as well as most anything else anywhere near the price and certainly anywhere near its size (about the size of a pack of cigarettes).


tweak1
3,666 posts
 
Just spoke with ric via phone, looks like mine will not be ready to ship until late next week. I told him he should let people know what his time frame is. I think he’s been preoccupied but now ready to stay focused

Hard for me to imagine zero improvement when direct soldering and using high end fuse, but then a lot of people seemingly cannot hear when polarity is out, so...
golfnutz
231 posts
 

@mapman 

I believe georgehifi mentions something about inefficient speakers, and that's what I'm referring to when paired with low-end class D amps. The Icepower 1200as2 were supposed to be the next best thing, however, that wasn't my experience.

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