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
Thanks, David.

There are indeed a number of pathways to pursue with the combination of the L2i and SIT 1s. But before I get started I wanted to make sure that the high damping factor of the L2i driving the Nenuphar was a non issue. Maybe the Ray Brown bass test--which the L2i passed with flying colors--wasn’t all encompassing. So I dove into my orchestral playlist to hear more. And I quickly discovered a problem. The L2i delivered the bass drum with a whimper, no impact, no mallet on skin. The drum’s climax after a crescendo was muffled, dim. Played through the SIT-1 with the XP32 pre the drum was big, impactful, as it should be. Night and day difference. One track that made this incredibly obvious was Prelude and Aztec Dance from Reference Recording’s Fiesta!, Dallas Wind Symphony, Howard Dunn. This was a big let down for me because other aspects of the L2i’s synergy with the Nenuphars were so positive: the deeper, wider soundstage, the enhanced 3D presence, the lit-from-within tonality. How much of that is attributable to the DHT pre-amplifier part of the design and how much to the AB MOSFET amp stage? Well, running the L2i into the SIT-1s as a DHT preamp might help answer that question. (With those big Elrog 300B Polaris missiles emerging from the top of the L2i, I think we all might have a hunch.)

Still, how could the L2i play Ray Brown’s bass with depth and impact but drop the ball with the big bass drum entirely? The greater the bass dynamic the more the damping factor affects it?
Stephen
Your findings closely mirrors the listening impression/ findings of Srajan Ebaen in regard to the bass performance as it relates to the DF. It does make sense when considering the design objective of the driver as stated by Cube Audio. I expect that the DHT Rossi preamp section will be beautifully matched with the S.I,T.-1 amplifier
BTW I'm very familiar with the Elrog 300b, a superb sounding tube. 
Charles 
I've been researching dht preamps and am really looking forward to the report Stephen. Not sure it'll have enough gain to drive my F4s, but the VR preamp really looks great.
All good, thanks David. Enjoying my Cube/Bakoon system. I noticed Srajan had good results also with VR pre and Bakoon as an amp only.  It will be interesting to hear what VR/SIT 1 is like from Stephen.
Btw, I just wanted to say how exemplary this thread is. Just pure, helpful, experience sharing and education. It's really a pleasure, thanks. If only the rest of the site could follow suit...