Most transparent amp you've heard?

the most transparent amp i've heard is the darTZeel NHB-108 using the darTZeel NHB-18NS battery powered preamp and connected with the 'zeel' BNC cables.

the dart is a solid state design but it's sound is like music. no solid state sterility, grityness or upper mid-range glare, that wonderful solid state high frequency extension but with a sweetness instead of hardness. the dart also has that 'breath of life' of tubes without the darkness or roundness. with a very short signal path, minimum number of output devices and no global negative feedback you have a 'see-thru' quality, delicate nuance, naturalness, and an extremely low noise floor yet excellent micro-dynamic energy.

the dart does not impose a character on the music; instead it gets out of the way and achieves an amazing level of transparency and it's sound is the sound of real music.

the closest thing to a darTZeel in transparency in my experience would be the very best OTL tube amps; my favorite of which is the Tenor OTL and then the Atmasphere.

i have not heard everything out there.....

Atmosphere puts it well......"Ultimately transparency turned out to be "a lack of audible distortion, which would otherwise mask detail".
I have the Halcro DM58 Monoblocks which have ultra low-distortion as their main aim. I also have the Halcro DM10 Preamp. The reduction in distortion with the insertion of these amps was certainly beneficial to the overall 'transparency' of the total system, but it wasn't until I reduced those remaining distortions by inserting the ZYX Universe cartridge, the Raven AC-3 turntable, the Continuum Copperhead arm and most importantly.......the Duelund VSF capacitors in the speaker cross-over, that a blissful purity of effortless sound could project from the system's speakers.
To listen to most other systems now, I am painfully aware of the low-level distortions which are present. Atmasphere knows his 'onions'!

Thanks for the replies.

I'm going to RMAF this year. Here is a list of amps I want to audition.

ASR Emitter 2 exclusive
Atmasphere MA2 mk3
Audio Research
Bolder 2060
CAT JL2
FM Acoustics
Halcro
Parasound JC1
Pass XA.5 and X.5
Rogue Zeus or Apollo
Spectron
Wolcott not sure if they will be there

Is there anything else I should look out for that will work with my Innersounds?

I know audio shows are not the best way to audition gear but most of the stuff I'm interested in is not represented here in Seattle.

Just remember that they have a decreasing impedance with frequency and (to quote soundstage review);
"These speakers can get by with amplifiers of modest power ratings just as long as the amplifier is stable into capacitive low-impedance loads."