Cube Audio Nenuphar Single Driver Speaker (10 inch) TQWT Enclosure

@khragon Both of your amps will work. As Charles, @cal3713 and @toetapaudio mention, it will be interesting which of the two you prefer. If you bring in other amps to audition it should get very interesting. : )

I have driven the Nenuphars with the T+A PA 3100 HV and the sound is very good but not to the level of where it is with the 2A3s. Of course, my personal tastes need to be factored in. Given my system changes since, I need to audition it again and I plan to once a soon to be delivered component is fully run in.

As an example, I believe @toetapaudio is very happy with the Nenuphars and Nenuphar Minis being driven by his Bakoon amp (Dawid had the same amp on hand but doesn’t mention trying it in his review...which may have been a mistake... based on Robert’s findings).

For reference...a section from a Wikipedia Article on "Damping Factor"

"Typical modern solid-state amplifiers with negative feedback tend to have high damping factors, above 50 and sometimes above 150. High damping factors tend to reduce the extent to which a loudspeaker "rings" (undergoes unwanted short-term oscillation after an impulse of power is applied), but the extent to which damping factors higher than about 20 help in this respect is easily overstated; there will be significant effective internal resistance, as well as some resistance and reactance in cross-over networks an speaker cables.[1][2] Older amplifiers, plus modern triode and even solid-state amplifiers with low negative feedback will tend to have damping factors closer to unity, or even less than 1 (very low damping factor/high output impedance amplifiers approximate current sources).

Large amounts of damping of the loudspeaker is not necessarily better,[3] for example a mere 0.35 dB difference in real-life results between a high (100) and medium (20) Damping Factor.[4] Some engineers, including Nelson Pass claim loudspeakers can sound better with lower electrical damping.[5]

[Start Emphasis] A lower damping factor helps to enhance the bass response of the loudspeaker by several decibels (where the impedance of the speaker would be at its maximum), which is useful if only a single speaker is used for the entire audio range. [End Emphasis]

Therefore, some amplifiers, in particular vintage amplifiers from the 1950s, ’60s and ’70s, feature controls for varying the damping factor. While such bass "enhancement" may be pleasing to some enthusiasts, it nonetheless represents a distortion of the input signal."

https://en.wikipedia.org/wiki/Damping_factor

@cal3713 What brand of silver speaker cable did you purchase?

Interesting because with the SIT-3-Nenuphar combo, I prefer the WE 14ga vintage copper cable (similar I would imagine to your Dueland tinned copper).  Bunch of improvements over the silver Clear Day Double Shot Guns I had been using.  

But I'm just approaching 50 hours of break in and already things have changed since my last post.  My preference between the LTA Ultralinear and the SIT-3 has swung more towards the latter.  Something has changed, opening that amp up.  The previous owner of the SIT-3 told me it had low hours on it and I believe it is breaking in along with the Nenuphars.  More on that when I get to the 100 hour or so mark.

I wonder if anyone knows what type of wire runs from the driver to the speaker terminals inside the Nenuphar cabinet?

I will be purchasing the Nenuphar 8's or 10's very soon and I am waffling daily on Cube's cabinet or building my own.  My question is has anyone heard the Nenuphars in a open baffle design?
If I remember correctly Nelson Pass has used them in a open baffle design and lived them.

Just exchanged emails with Grzegorz.  He said they use multi conductor copper cables in their speakers and that he prefers copper speaker cables.