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

Although I know RIAA's above comment is in jest, just to be clear for future readers... If you don't follow the 1/10th ratio rule, you will not get a flat amplification of the preamp signal with frequency aberrations in the bass response.

Also, it may be possible to modify the amplifier to address this issue (depending on amplifier design). My first watt f4s (simple class A without feedback) have a 47.5k input impedance, but can be modified to have a higher I.I. simply by changing out the resistor on the input.  I was informed that I could use anything up to 250k without changing the operation/sound of the amp. Doing so enabled me to use much smaller output caps on my Don Sachs 6sn7 preamp, and allowed me to afford some top end duelund's that greatly improved the sound. No idea if this is possible on the bakoon... but hopefully useful information regardless.

Having an outstanding tube line pre driving a 10k load is possible. I fact I had Don Sachs configure one output to drive a 10K load and one to drive the normal 100k load. Sounds fantastic!  Just takes a big ass high quality cap.

EnjoyTheMusic has a short news item on Aries Cerat and their new Ianus series of electronics:
www.enjoythemusic.com/news/0720/

Aries Cerat Ianus Series amplifiers is a showcase of the company's unique TriodeFet technology. After years of developing and refining their technologies, they are proud to introduce the TriodeFet technology, and a Series of amplifiers that implements this truly innovative technology. This technology is neither a hybrid topology (in the usual sense of a tube-driving solid-state stage type), nor a solid-state driving tube kind of stage. TriodeFet is a new way of using hollow and solid-state devices. The concept is to have a low voltage / high current active device, which had the linearity of a triode, and at same time would be able to source enough current to drive low impedance loads directly.

The TriodeFet, can be seen as a three terminal active element, just like a MOSFET or a triode. The company's breakthrough is that its transfer curves are identical of a true high quality triode, with the only differentiator from a true triode is that, the Y-axis (current) is in scaled in Amperes and not mA. What this means, is that you can design circuits that were never before possible either by using tubes or transistors. This new active element can be used to develop simple, very linear circuits, which are stable down to very low impedances, while the TriodeFet's inherent linearity is making the use of the problematic negative feedback redundant. New models within the Ianus Series include the Geminae (€110,000) Class A amplifier that produces 130 Watts @ 8 Ohm. Aries Cerat's Essentia (€39,000) is the little brother that produces 40 Watts @ 8 Ohms.

The Aries Cerat website has a News section:
http://aries-cerat.eu/news

Be sure to scroll down, look at the show pictures and check out the speaker drivers....

Just received a lightly used (less than 20 hours) Cube Nenuphars 2 weeks ago. I purchased them on Agon from Salon1Audio (excellent experience). I wanted a speaker that could take full advantage of my beloved First Watt Sit-3 amp that was driving some modest bookshelves to amazing heights in my second system. My second system had taken over my main system for most listening sessions. The main system (Magnepan 3.7i speakers, Pass X250.8, LTA MZ3 pre, Antipodes EX source with Roon and Qobuz) was not shabby either. I bought the Cubes on faith. I had not heard them before buying. That is a first for me. The reviews and the forums were overwhelmingly positive and the match up with the Sit 3 seemed to work well.

Out of the box the experience was disappointing. The speakers seemed to need more power than the Sit 3 was giving them. I have a second Sit 3 and considered bi-amping. I assumed more break in was required and sat tight while it ran. After 50 hours the sound was still dry. A fellow audiopal came by with a few of his best toys and we listened for about 4 hours. He convinced me to give the X250.8 a try. Boom- the Cubes opened up. We cautiously drove them knowing the 40 watt speed limit. The sound relieved me that the speakers were getting there but the more powerful Pass was not a long term solution.

We then brought in his Zu Undertone sub. Without so much as dialing in the phase the improvement and the match with the Cubes was amazing. We rolled through a number of tracks and finally just started to listen instead of analyze. Closer yet. Closing on midnight and with work looming we called it a night. Sean Casey's sub is an absolute dream match up for the high efficiency Cubes. I'm getting a shiny gloss black Undertone to match the Cubes and would recommend it for those who are considering the hybrid Cubes now offered. You only need one Undertone. No need for 2 subs here. It is fast and blends in with the Cubes as if they were designed for one another. My neighbor is now on the search for a used Undertone to go with his Druid 5s after taking the system in yesterday. His words-this is the best system I have ever heard and better than anything we listened to at RMAF (2019).

Now after over 100 hours the Sit 3 is back in and the Cubes are receptive. This is what I was waiting for. 6 moons describes the sound very well, in my opinion. I suggest that read. Despite turning it up for a long listening session yesterday my friend and I felt absolutely no fatigue. The coherence and imaging are as advertised. The hype is very well deserved. The Sit 3 can now show off its brilliance to the fullest extent (thank you Nelson Pass!). My guess is that the break in isn't over yet, either. If I don't get more out of the break in it won't matter much at this point. I haven't heard anything come close to this for less than $100k.