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: 

https://www.cubeaudio.eu/cube-audio-nenuphar

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

https://6moons.com/audioreview_articles/cubeaudio2/

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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.
david_ten
Wow, the grey looks great. Probably doesn't show fingerprints or dust as much as the black and not quite as flashy as the white, but still very sharp and modern looking.

Thanks everyone on the feedback earlier. I'm really excited about getting these speakers. Maybe I'll start another thread but I'm wondering what tube amp you'd recommend up to $5k with these speakers (used options totally ok).
@abd1 Can you share more about your needs and goals?

I learned there are far more options than I expected, due to the Nenuphars being easy speakers to drive. I was skeptical that my 2A3 amp would be sufficient, yet it was and is. I would even go so far as to recommend a 45 based SET, though with some caveats. The sweet spot from a power perspective, in my opinion, are the 300B amps.

Since you are looking at tube amps, consider those with zero negative feedback (or those that use low levels of NF).

I recommend reaching out to @charles1dad who is very knowledgeable in this area.
@charles1dad Thanks! I like the contrast as well. Regarding the red Solistino, when I first saw it, my reaction was, one must be pretty brave to buy a color like this. But then, looking at it a couple of times by the dealer my mind changed completely. It looks so nice when the light in the room is low or off, and the light from the tubes hits the red color.

@abd1 Thanks! You summarized very well my thoughts. Sorry, but I do have no recommendations regarding other amps. But I have seen, every now and then, a view used Vivas in that price range out there.
@david_ten I guess I'm looking for something that's going to maximize the qualities of the speakers. Sounds like SET amps with zero feedback and great matches with these speakers. I've had Primaluna and Line Magentic tube amps in the past. I liked both. The LM was the LM-508 and it was the best sounding amp I've had. 48wpc Class A SET. However, it was a beast (hot and huge), had a bit of hum that never went away. The Primaluna was the older Dialogue One and it also sounded great, was really silent and was a bargain. I currently have a Tektron EL-84 that I could use. It's a push pull at about 10wpc and sounds really good. I know Tektron shows with Cube often. I also had an LTA Ultralinear and wish I hadn't sold it. It wasn't a good match with my speakers at the time but I wasn't planning on changing speakers so I sold it. Had I known I was going to be able to get these speakers I would've kept it. However, I would still like to try their REF40 amp. I guess I'm looking for anything that has that tube magic (texture, tone, imaging, dynamics), but also good control. Since these speakers are fairly efficient I'm open to whatever is going to deliver. I've also thought about looking for an Ayon Spitfire or Crossfire. I do have a Sachs tube preamp so I could just go with an amp, but if it's an integrated that could be ok too. A couple caveats... it has to look good as it's going in my living room and my wife needs to be happy too, and it can't be a huge monster that's nuclear hot (I have limited space). Some heat is to be expected but I want to be able to use it in the summer too. Anyway, any directions to point me in would be great. Thanks!
Hi abd1,
One thing to keep in mind is you don’t require a lot of power to very effectively drive your Nenuphars. The Line Magnetic 508ia is definitely going to generate heat. The 805 is a high power DHT output tube that demands a very high voltage (1000V) power supply. 48 watts pure class A circuit is by necessity going to create some heat, that’s unavoidable.

Your current el 84 push pull amplifier should be a very good match. If interested in a SET I’d look for a really good quality 2A3, PX 25 or 3000b. The Nenuphar doesn’t require an amplifier with negative feedback (NFB) due to the very damped driver.

Compared to your current amplifier a good SET may likely provide more of the tone and texture you desire. It can possibly be more holographic and tactile in presentation as well.

These lower power DHT SETs don’t generate much heat output either. If ever there’s a good time to explore a SET amplifier you have an excellent opportunity via your Nenuphars. They are designed specifically for these SET amplifiers even though they work well with other amplifier types for certain.  
Charles