So, one of many knowledgeable guys here (he had an amp for sale recently) helped me realize what it is I really want: I won't be happy without a bit of the warmth and spaciousness offered by tubes, and (heaven forbid) I'm willing to give up a bit of accuracy to have it.
I don't prefer to have a separate amp and preamp but it could be done. There is no more room on the rack; but I could just put an amp like the AHB2 (not too large, not too heavy) on a wood platform on the floor leaving room on my rack for everything else (Power conditioner, modem, EtherREGEN, Streamer/DAC, preamp, Raal interface box, CD player). Rack is two shelves, 45" x 18"...
Another option is a tube hybrid integrated amp. Suggestions? And, are there any truly high-end hybrid integrated amps that will (should) work with the Raals, which weigh closer to 40 lbs than 100 lbs.
I was reading a bit - I already have a Cary DMS-500 Streamer/DAC - and I ran across a review of the tube-based Cary SLI-100, which does output 100wpc into 8 ohms and (for those of us with Ether 2s or Utopias, etc.). However, with this tube-based design it also outputs 100 wpc into 6 ohms and 4 ohms (and 5.6 ohms). Raal suggests 100 wpc into 8 ohms minimum, but are they really "requiring" 150 wpc minimum into 6 ohms?
Aside: The SLI-100 is supposed to be a superior headphone amp also (both off the taps and from the 1/4" jack on the front); the signal from the 1/4" jack utilizes the entire circuit path of the SLI-100.
It seems the Raals respond to current; how do I know if the fully tube-based Cary supplies enough? And, maybe tubes aren't "quick" enough to bring out the best in the Raals? Are there specs in particular I should look at to determine suitability?
NOTE: If I go the SLI-100 route I would add the Hexfred rectifier option:
"Hexfreds are high speed low noise rectifiers and replace your existing standard rectifiers in the power supply. You will notice more speed, air, detail, imaging and tighter bass, yet a cleaner clearer sound quality. The Hexfreds help to provide a cleaner, faster DC voltage which shows up very noticeably in the sound quality. There is one more layer of hash and hardness (noise) that is removed so that you can just enjoy the music! Bass is faster with more details and the midrange and highs are cleaner and clearer. You will hear more detail with less bite."
With the Raals, this seems like an extreme no-brainer? And, I believe the SLI-100 already utilizes Mundorf caps...
Summing up: For the Cary SLI-100 (and for other enthusiasts considering the Raal headphones, relating to most any other amp they might consider to go with them), what does any of the following mean to me in practical terms?
100Wpc into 8 ohms (20dBW).
Maximum gain: 34dB.
Frequency response: 19Hz–23kHz, ±0.5dB.
Input impedance: 100k ohms.
Sensitivity: 450mV RMS.
slew rate?
Damping factor?
Input Sensitivity?