I just updated the main thread with the following:
Update 12-5-07
> Qables iQube
Info:
i-Qube - A new dimension in portable hi-fi » home
The iQube is a very interesting amp. It's a class D amplifier topology. This is the first of its kind as far as I know - a class D portable headphone amp. Class D has at least the potential of being more battery-efficient, and I did get almost 100 hours of play on the first set of AAA alkalines I had in it (which I used up in 100 hours of break in). The iQube will charge rechargeables, but it doesn't come with them, nor does it come with a charger, although it has a fairly wide tolerance for AC adapters it would seem.
Build Quality: A+: Excellent, VERY attractive metal case. I wasn't sure at first about having the jack on the back and the volume control on the front, but I loved it in the end. There is a very slight turn-on tick. But overall, the build quality is among the very, very best, and it's the kind of thing that gives great pride of ownership.
Treble: A+: clean, clear, grain-free, extended and transparent. Great air and extension, and very natural. It wasn't too aggressive ever, but it wasn't at all soft or rolled off. I wouldn't use it with super-bright headphones. But this really isn't the iQube doing anything other than being VERY neutral.
Midrange: A: smooth, clean, and open - with amazing see-through type clarity, while being tonally very neutral. There is perhaps just a touch of reticence, but not enough to worry about.
Bass: A: Ultra-deep and powerful, with excellent definition and speed. VERY tight, but not overly generous. Again, Neutral comes to mind.
Neutrality: A+: The new king of Neutrality. Over and over again that's how I thought of it. Easily shows the difference between headphones in a flash. Only the LISA III is in the same league here. While I still love the Meier Move, it has a "sound" moreso than the iQube.
Soundstaging: A-: The soundstage was great, but it wasn't the WORLD's widest. Still, nothing to sneeze at.
Transparency: A: Nothing to take issue with here either. Try as I might to pick up some kind of issue with transparency related to the use of class D, I couldn't. I just loved it.
I have to say, I was HIGHLY impressed by the iQube. Unfortunately for those in the USA, the current dollar>Euro exchange rate makes the iQube pretty expensive -- as of today, it would cost the American buyer over $460, and January 1 it will cost about $500 (at current exchange rates). And as good as it is, I personally don't think it's enough better than the other top amps to easily justify that price here. I know there is nothing Hans at Qables can do about his costs, or the dollar to euro exchange rate, but it is a pity. If this amp could be had in the US for $335, it would be very easy to recommend as the best buy in high-end headphone amps. But it's $335 EUROS. So for everyone in Europe, this is a great amp to get. For those in the US, I think it requires a little more thought. Nonetheless, it's a superlative headphone amp.
Conclusions (12/5/07)
OK, so now it’s now 30 amps! Here is my view on how the amps stacked up. Note that the sum of the "Grades" I give does not always tell the whole story in how I rank them, since the whole is sometimes greater or lesser than the sum of the parts, and I am often forced to split hairs here, since the list has gotten so long.
1. Triad Audio Lisa III
2. Qables iQube
2. Larocco Audio Pocket Reference II mk 2
2. Meier Audio MOVE (discontinued)
3. RSA SR71
4. RSA The Hornet “M”
5. Xenos 1HA-EPC (discontinued)
6. RSA Tomahawk
7. Meier Audio Porta Corda III (discontinued)
7. Xin SuperMicro IV (discontinued)
8. Headamp AE-2
9. Go-Vibe 7
10. Leckerton Audio UHA-3
11. Portaphile V2^2
12. mSeed Spirit (discontinued)
12. Mini-Box E
13. Storm B4
14. iBasso P-1 (discontinued)
15. Visely HEA- 1
16. Microshar uAmp107
16. Practical Devices XM4
17. C&C XO
17. iBasso T2
18. Go-Vibe 6 (discontinued)
19. Xtra X-1 Pro
20. Xenos 0HA-REP (discontinued)
20. iBasso T1 (discontinued)
21. Xtra X-1 (discontinued)
22. C&C Box V2
23. Little Dot Micro+ (discontinued)