Going linear - The Luxman 507ux

Also, you're experiencing the law of diminishing returns. Of course your Luxman will sound a 7 times better than your class D amp. Just today my kid wanted to watch a show. Anthem 1120 driving the center vs Parasound A31 (there is a switch in the system, I normally keep on A to keep it simple for wife and kids, have the receiver drive all the speakers). Took me a while to realize it was being driven by the internal amp, but didn't take too long. The dialogue just wasn't as clear. Like the last 2% was missing. Last 2%.

Glad you like I it. I have a few of them around my houses, I did pick one up from Mike about a year ago, same as yours. I also have the Mark II version. Not much of a difference unless in a DAC feeding it and speakers can show it, then it's just a bit more lower bass definition and better connection between bass and midrange. I wouldn't get a Rogue. Not same class as Luxman. If you like the Luxman, you ought to try Audio Research VSI75, probably the best bang for the buck in high end audio. Listening off side, like I do when I work, there is zero difference between Luxman L507uX and AR VSI75. But when you sit in the sweet spot, the depth of the imaging is day and hight. Literally day and night. This is why I generally keep Luxmans in my living rooms, kitchens, etc and I always keep Pass or AR gear in my main systems. I really want to try the c/m900 combo just to see if it compares to PASS/AR, but simply can't blow that kind of money right now. But the 507uX is a GEM. But seriously, if you want tubes, go for the AR VSI75. They can be had used for around $4000. And yes, the KT150s are a much better tube that the KT120s. It's the only new tube I feel blows Gold Lion KT88s and Amperex EL34s totally of out the water.

I meant will not sound 7 times better. But listen to the depth. I have always found Class D fails there. I have a NAD M27 and in two channel mode I always feel it fails there, in the depth aspect.

@jetter I don't think you're going to get that day and night difference with any amps over a certain price point. In my living room setup, with a click of a remote (a high end Luxman speaker switch wired in reverse), I can currently switch between Primare A30.7, Audio Research LS28/VT80 and a Luxman L507uX. AR combo is my preferred combo, but I cannot simply articulate why, my foot just taps more and the soundstage is just better/wider/deeper but many times, when I work from my chair, I'll just start playing some music via the Primare A30.7 left on from movie watching the night before and even thought it's a Class D amp, it sounds wonderful as well. It's neither ICE or nCore, it's their own technology and sounds great. 

As to class D, my movie system downstairs is powered by NAD M27 (nCore) and to me, it's about as good as amps get. Hard to justify the expense of tube amps or for that matter my Luxman/Yamaha collection when the NAD just signs and throws a giant/deep soundstage when fed by a proper preamp instead of AVM60 even though AVM60 ain't too shabby either.

@jzzmusican Only tube amps I have ever found to control bass about as good as solid state are from Audio Research, especially with the KT150s. Primalunas are nice, but not in the same league as AR gear. Luxman imaging is great, like you said, tad better than Primaluna. AR VT80/REF75SE take it to holographic levels.

Loudness is a great feature. I use it a lot in the evening. I wish someone would create a perfect amp for me. I would have a Luxman in my main living room TV system but my wife would kill me as it would require her to turn it on and hit SEPARATE button. With the Yamaha, it has trigger in that automatically switches over to the MAIN IN from the processor. And the processor comes on when you turn the TV on. I need a Luxman with the same feature.