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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
rwpollock's avatar
rwpollock
89 posts
 
Just to complicate things, I was reading back through the thread and came across toetapaudio's comment from a year ago (6/20/19):

"We are getting great results driving the Cubes with Mola Mola Makua/Kaluga’s and look forward to trying Bakoon amplification soon with the Cubes."

The Kaluga's output impedance is listed as <0.003 ohm with a damping factor >4000.
www.mola-mola.nl/kaluga.php
Go figure.
david_ten OP
5,480 posts
 
@rwpollock  Good question(s).  Since Srajan Ebaen is very familiar with Nelson's First Watt efforts, perhaps an email to Mr. Ebaen (via his website) would shed light?

Regarding the Kaluga, perhaps @toetapaudio can comment? I believe his current favorite is Bakoon. 
toetapaudio
474 posts
 
Bakoon 13R is my preference with the Cubes. I’m using it with the Bakoon DAC21 which is out of production but I’m looking forward to a new dac from Bakoon in the imminent future. Physically the new dac will match the 13R. I’m expecting it not to cost more than the amp.

I’m over joyed with the sound I’m getting with the Cube/Bakoon pairing and I have had great comments from customers. The Bakoon very small, which proves bigger is not always better. I’m finding increasingly people want a simple and uncluttered system.
rwpollock's avatar
rwpollock
89 posts
 
Any thoughts on the output impedance question? IIRC, the 13R prides itself on low output impedance which should translate in a high damping factor

Robert
charles1dad's avatar
charles1dad
10,239 posts
 

The Nenuphar driver was very specifically designed to mate well with high output impedance amplifiers. It utilizes a "powerful" magnet to control the driver.  Srajan Ebaen  certainly confirmed this with his review where he used multiple amplifiers. the higher the output impedance (lower damping factor) the better the sound.


It is quite interesting how some listeners/owners of the speaker are reporting very good sound with amplifiers that don’t meet the desired criteria. It really seems that a high DF amplifier would deaden the sound of the Nenuphar as the driver would be markedly ’over damped’. I realize you have to trust what you hear but this seems very counter intuitive. I wonder what additional factors are involved here.

Charles

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