"Did you do a before/after assessment when adding the CRD to the LM4562?"
This is pretty hard science and not a subjective thing at all. No need for in depth listening sessions (which I'd done in the past just to prove it to myself anyway), it's one of those plug and go tweaks, like I was saying in the first post, a no brainer.
"What was the x7r mod? Is this the resistor in the power supply lines to the opamp that helps decouple the power supply with a RC filter?"
No, something unique to the older 180 modules I had at the time. What you're talking about though is something else I looked after when modifying my 400AD modules.
"I'm not sure I want to invest more time/$$ in the 1820m, it does fine for my surrounds, but has an annoying problem with switching off when warm, especially after a reboot, probably a bad joint but I can't find it. If I get this problem I put the audiodock in the freezer for 5 minutes and we are up and going again."
That's not at all good for condensation. Yeah I really wouldnt' recommend investing a cent or a second into the audiodock if you can replace it with something better. Their newer card, 1616M, might not suck so very bad, but I couldn't say from experience. I declined a big discount on one from them after I told them about my issues with this thing... still paying off this junk, dont' want another.
"I am comfortable modding the audiodock, it is a good platform for modding (eg. can add auxillary supply) and is something I might do over the Xmas break if I don't get the Lynx."
Not really... not really. Not if you can't help what's broken by design very easily.
"I agree Red Hot Chilli Peppers has awful mastering, mastered for FM radio and sounds flat"
Flat? OK, if flat is the point where they hard clipped it. My ears will ring listening to that at even a low volume.
"Do you listen to all your music with MP3, even with higher bitrate encodes? Lossless would be a better option especially as a medium for archiving & transcoding. I can tell the difference on my system between lossless & 320Kb MP3, so you may have a bottleneck there, and with all the effort on the DAC/amp/speaker/room, its best to use as pristine a source as possible - heck disk space is cheap now. I have 400 odd CDs on a 200Gb disk with lossless storage, well worth it."
No not all, I would say the 99.8%, yeah. The ~16 songs I like that are mastered good enough to make it worth my while I'll have in lossless, they are very, very few. I can easily tell the difference between MP3 and lossless as well, it's just not worth the effort to me, for a more pristine copy of junk is still junk. At this high a level of sound reproduction, most would be throwing their CD's in the trash in the first place, not archiving them in lossless format.
When typical mastering quality of what I like to listen to is pristine, I will typically acquire the pristine copy. For the very rare higher quality masterings, much of said higher quality is still conveyed by the MP3, even though lossless will convey more info still. What MP3 misses though, isn't greatly missed, certainly not enough for me to want to apply lossless format to everything just for those very few rare occasions of a very good mastering. So you see? It's not that I don't miss out on any sound using higher quality Mp3, I just dont' miss what I'm missing much, and with the usual garbage quality of masterings, it's no loss at all
"Last night I was listening to the new Santana HD-DVD which has the new DTS-HD codec (2Mbps bit rate and efficient encoding) and it was amazing, the first time I have heard a concert DVD (HD-DVD actually) that could rival a well mastered stereo CD, so I do listen to lossy sources"
Doesn't sound like you missed that loss much then
"I don't think the problem with my setup is with the soundstage, I have listened to a number of digital amps
and have noted that the two characteristics of them is better bass control (less sloppy) and better soundstage."
Could be all you heard there was a switching power supply, which are characteristics I expect their regulation would improve on, even though the 'net consensus on that seems to be they have worse bass control, or just power.... makes no sense but that's the rumor. You can't really attribute those characteristics universally to the topology itself though without implying some for of distortion unique to the classification as a whole. However I find with subpar electrolytics in the power stage the level of microphony in them agitated by the high frequency switching ripple messes with the microdynamics enough to create a kind of distrubed ambience, one that's different from the source. It can be more minor or severe enough to start dropping macro detail. My nutty theory.
"I suspect that I like stronger bass and as the Hypex amp and Dunlavy speakers are very accurate, which sounds thin to me, and the subwoofer boosts the bass which I can confirm with room measurements, but I like it like that. The sub moves so much air it also shakes the chair which adds bass realism and weight, because you can feel each hit on a drum, an effect that I only ever felt when previously listening to live music, and of course is a great effect for home theater."
Shakes the chair?? I can shake the cement floor a good 12 M away, and it's right in step with the tunes. There should be nothing but good old canadian shield under that. Feels like a minor earth quake, I'm not sure if it adds to realism or not. I like it. The problem starts when you have that happening at low volumes though, it's not realistic. More like car audio, where fronts are powered by say "25" watts and the subs by few 1000 watts.
As far as feeling every beat HG delivers it all and in perfect time with what you hear. Hell I feel each string too, like a kick in the chest, but its' from the midrange now. Felt your jaw rattle yet? That's fun too.
"In another thread in this forum there is talk about weak midrange for class D and I don't hear that. I do agree with you that if the room & speakers are right and you have good sources, then the deficiencies in the DAC and amplifier become more important."
mmmm I think they're more important to start with. As they improve further, the deficiencies in room and speakers will take over and tip the bottleneck scale into their favor, but I think, even though it's all one system in the end, that the electronics have to be very good to get to that point.
My point really is, most people don't have a choice what they can do with their room besides where to hang the odd picture, or throw a rug, and things are so non ideal that I'd have to be dreaming if I heard any difference doing that here. There's a lot I can do with the amps and what not though that will improve things more, and more, and more aaaaaaaaaand more, without the room or speakers ever changing.
How much of a bottleneck is that then? It hurts focus, and perhaps the truest illusion of ambience, etc... does not ruin enjoyment. For example, let's see if I dont' get more focus with further improved regulation (auxiliary supplies implemented) and going full monoblock for a very first, in this very same room with these very same speakers. Do you think the room and speakers will hold those little tweaks back from being very audible? Sure they'll hold it back a little bit, but they're going to blow the walls down that much more anyway. Just like adding the CRD's did, I sure heard that.
BTW, my favorite "room treatment"... closing the windows. Unless it's -30C outside, where it would then be opening the windows. Both are kind of hard not to notice a difference.. and that's all the treatment this particular room will ever get.