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.
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I acquired a Canary M90 push pull 300b amp that I’m going to try. It sounds great so far with some 85db 8ohm stand mounts that I have and that’s not an optimal pairing. Looking forward to how it sounds with the Nenuphar Mini’s. 
Charles, in my high efficiency speaker experience I consider 845s or push/pull triode to be more ideal for this efficiency level. Running low watt SET at high levels yields more distortion. Ymmv.
Hi keithr, 
If I'm correct your experience with high sensitivity and efficient speakers has been predominantly Zu Audio.i am not questioning your encounters with them and various amplifiers.  I believe that the Cube Audio Nenuphar though not as sensitive as the Zu are an easier load to drive in real life/actual use. 

People seem to have more success with  low power SET driving Nenuphars compared to these same amplifiers paired with some Zu models. I believe that Srajan Ebaen alluded to this observation in his 6 Moons review of the Nenuphar. I understand that its 92 db sensitivity may lead some to question compatibility with low power SET amplifiers.  Numerous reviews and owners feedback say otherwise. 
At many audio shows, the Zu Audio room features their models playing hard rock and metal music playing at extremely high volume.  The speakers are quite capable at delivering at high volume levels.

Full range single driver systems cannot deliver that kind of volume level (the Nenuphars delivered plenty volume for my particular taste) and actually excel at delivering a vibrant sound at quite low volume levels.  Although they are not particularly efficient, they are probably efficient enough for use with some SET amplifiers if one does not demand extreme volume output or use in a very large room.  

Use with a single-ended 300B amp?  I don't know, I never heard them used with that kind of amplifier.  But, I guess they are not well suited for smaller single-ended amps, like those running 45s, given my experience with a 99 db/w 8ohm speaker (I've run this speaker with pushpull 45s, parallel SET 2a3s and pushpull 349s; single ended 45s were okay, but marginal with certain kinds of music).