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

Cube Audio (Poland) designs single drivers and single driver speakers. 

Principals are Grzegorz Rulka and Marek Kostrzyński.

Link to the Cube Audio Nenuphar (with F10 Neo driver) speaker page:

Link to 6Moons review by Srajan Ebaen (August 2018):


Parameters (from Cube Audio):

Power: 40 W

Efficiency: 92 dB

Frequency response: 30Hz - 18kHz ( 6db)*

Dimensions: 30 x 50 x 105 cm

Weight: 40 Kg

* Frequency response may vary and depends on room size and accompanying electronic equipment.
Thank you for bringing this thread to my attention, and for linking my video in!
I am using the Fc8 V2 in my traditional Voigt pipe cabinet (close to Paul Voigt's original, with cabinet volume adjusted to Fostex Fe204 Vas), and have about 7 hours of break in so far.
My observations are right on with @mikeg 's observations (post above, his 75hr break in report):
*Superb center fill
*Complete lack of directionality, sweet spot opened up (after 15min break in): image stays 3D in the entire room, I can sit / stand, move to the side, move between speakers - 3D integrity stays. Ear does not get cues about the actual place where the speakers / drivers are.
*Superb low end extension. First hour of break in bass was loose (yet extended), and it started tightening up, cleaning up. Level is lower as of now than mids & highs, but getting louder (catching up to mids) noticeably as break in progresses.
*They do not seem to mind silver. Using copper IC and speaker wire, but amp is fully silver wired internally and speaker cable has silver terminals.
*They do not need a sub. They reach very deep (my Voigt pipe cabinet has the ability to convey to 30Hz in my room). Church organ rendered beautifully. The low bass is better integrated and cleaner than a sub could render it, even when the sub goes lower than 30Hz. I agree, sub takes away from FR bass quality and integrity.
*They are getting louder as they break in. I think the spider has to break in mechanically, so it can allow the cone to move freely. As the spider is quite strong (not the usual soft material), this break in is expected, and should be pronounced. In the first hour louder passages were compressed and got a little confused, but this is disappearing with break in, and they can play louder and louder. Mind it, I'm still under 10hrs of break in...
*Softer / mid volume parts are all beautiful, exquisite 3D rendering. Precise, holographic, yet NOT FORCED nor FAKE. With most hi-rez multi-way speakers I get the impression that something's not right with their hi-rez rendering. Here, I'm not getting that feeling, the presented space is natural and comfortable.
*The sound is very much energized, with excellent, very precise HF reproduction. Yet, it's not fatiguing! HF and air without distortion, which is a feat I heard only from the best compression drivers.
*Whizzer cone: whizzer cone artifacts typical to FR drivers are missing. No "Lowther shout" whatsoever.
*I was worried about the magnet material being Neo / ferrite and not Alnico. My worries are gone, the motor was implemented superbly. The tone is the opposite of Alnico drivers, but that's something I welcome. (I have a bunch of Alnicos, varietas delectat, I was actually looking for the complementary flavor!)
These are my initial impressions...


Thanks for taking the time to find this amplifier list. It is self explanatory. 

@realworldaudio Janos, you are welcome!

A double welcome: one for joining the Cube Audio family via your new Fc8 drivers and another for your posting here.

Thank you for sharing your detailed, initial impressions. If the Fc8 follows the F10 Neo drivers, expect a long (mostly enjoyable) break-in period and a positive (significant) improvement delta.

For those that are unfamiliar with Janos, he is based out of Hawaii and has a YouTube Channel dedicated to audio. His YouTube Name is Real World Audio. Here’s a link to his ’videos’ page:

Real World Audio

@david_ten The following paragraph precedes that amplifier list and this what was stated one time as referenced in the Mono & Stereo review of the Nenuphar:

Magus are dedicated for rooms of 12 - 25 square meters. They are a perfect match for a tube amp with at least 3 Watts per channel. Our personal preference is somewhere around 2A3, Px4, 45 tube-based amps.  Nonetheless, most solid-state amps (especially those working in A-class) are also an amazing match for the Bliss C.  When it comes to placement, they can be placed both forward and placed right against the back wall. They like about 5-10 degrees of toe-in.

“Our preference” is the distinction I picked up on and 300b amps were not included.

@realworldaudio That was an excellent summary and I find your speaker cable mod (single run for the positive and five runs of speak cable for the negative) very interesting.

@david_ten Thank you David for the warm welcome!

It is a pleasure to join the company of like-minded audiophiles. A little background on me: I have experimented with Voigt pipes in various forms and interpretations, drivers, rooms, and how they fare with associated electronics for over 20 years. I had the pleasure to spend my audio journey with like-minded friends, in a very strong local DIY community, and an amazing mentor (Stu Ono) who was regarded as a fountain of knowledge by a good number of the US leaders of high end audio industry.

I can say the Cube Audio has truly raised the bar! I have the version 2 of the Fc8, and currently breaking them in my Voigt pipe cabinet (which has been my most successful Voigt pipe). 

Cheers, Janos