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

Showing 10 responses by jollytinker

I haven’t seen any reason to be suspicious of Cube Audio. I had a good experience with them and the distributor when I needed to swap out a driver shortly after receiving the Nenuphars.

 

just a couple words about that: changing the drivers is easy in principle but it can be tricky to execute. The magnets are very heavy. I found it best if you lay the speaker on its side before beginning surgery. Obviously you want to do that on a soft rug. Once you remove the bolts (ONLY the four outer hex bolts, the inner ones hold the spider together), the driver can slip from its position suddenly. If you’re close to the floor you have more leverage on the driver and a shorter way for it to fall if something bad happens.

 

Also, the magnets are so powerful that they can easily pull a hex wrench from your fingers when you loosen your grip even just a bit. The wrench will fly directly on to the edges of your whizzer cones with quite a bit of force. The simple answer is a non-magnetic hex wrench (believe its 4mm). I found one for 12 bucks on line and thought it was a small price to pay for the peace of mind.

I've been trying out a new pair of Nenuphars for about a week now and I'm mighty impressed. I'll chime in more as I find the words to describe what I'm hearing. I'll just mention for now that I'm powering the Nenuphars with a pair of Thoress EHT mono blocks. These amps are somewhat under the radar (they're pricey and don't seem to have much retail support in the US) but Ebaen reviewed them at 6moons in combination with the Nenuphars and used some striking language to describe the pairing. He rates the EHTs as a better match for the Cubes than the FW SIT1 monos.  

http://https//6moons.com/audioreview_articles/thoress2/

FWIW I can see what he's talking about. I compared the EHTs with a SIT3 and found the difference to be profound (much as I love the SIT3). For now I'm still working on getting speaker placement and room treatments dialed in (at 20 sq meters my room is at the bottom end of the range for these speakers as specified by Cube Audio). so, more to come.

Thanks to all here for a refreshingly good thread!  
@cal3713 thanks for pointing out the typo! I should've checked it. 

@stephendunn  I'll keep you posted as I make progress on the room treatment. I'm trying to be minimalist about it because the room has to double as a living room so I don't want to overwhelm the space with audio gear (though I probably lost that battle already...). The main issue is that the room has 10' ceilings and big windows so there's quite a bit of high frequency ringing in addition to the usual low/mid boominess. I put a 6' piece of homasote board on one large, empty wall which helped calm things down. Also I bought a few pieces of 4" thick rock wool insulation to experiment. Last night I put pieces of the insulation at the first reflection points and that made a noticeable and positive difference, more so than in the back corners, but it also felt a bit overdamped to me. So I can see the point of products like the Stillpoints Apertures that do a mix of absorption and diffusion.  

btw I didn't mean to sound too fanboyish in my previous post - just thought the EHTs deserve a mention and i'd love to hear from anyone else who has experience with them. They're the only Thoress amps I've heard and they're the kind of component that just has an certain "rightness" about the sound. 
I’ve got about 60 hours on the speakers now and I can report that I don’t hear any "lowther shout." The top end was pretty strident at first but it now sounds very natural. The bass at first was MIA but now it’s coming in nicely. I wonder if the youtube videos that seemed to reproduce a ’shouty’ sound were made with newer speakers that weren’t fully broken in?
@david_ten  Yes. That’s been my setup for the past five months or so. From what I remember of his account I think Ebaen described it well. Remarkable sound.

Nothing major to report since last time. I find that Ebaen is right when he says that the EHTs and Nenuphars together sound like “something cracked open.” good words for the sensation. “Benign psychotropic drug” is also good. it sounds like a quantum leap in resolution without the tipped-up feel of other similar drivers. In this regard I’m comparing the Nenuphars to a pair of Teresonic/Lowther speakers I have in an upstairs system (which are smaller btw). When everything in the system is right it can be really spectacular and if things aren’t right, you’ll know.


The EHTs are really special amps in my estimation and I’m not sure why they’re so little known. If you find yourself having to choose between warmth and detail, the EHTs just seem to leave that whole problem behind. They’re “warm” in the sense of being full in the midrange with gorgeous timbre, but also open and airy and pinpoint in the presentation of a soundstage. I’d say they’re just genuinely linear. They also sound great with both Proac tablette 50 signatures and the nenuphars, obviously very different speakers. I’m about to try them with the Lowther/Teresonics so I can update further on that pairing. 


On the Nenuphars, I’ve settled on the basic layout I started with. Slight toe-in as recommended by the manufacturer, with slabs of rock wool against the wall next to speakers to damp the first reflections. That really helps to crystallize the images lying outside the speakers, ironically. I have a tough room to work with at the moment - about 14’ square with 10 foot ceilings - and it’s our living room so I don’t want to make it look like an audio lab (any more than it already does). in the next year we’ll be doing a re-model that will give us a much larger and longer room elsewhere in the house, so at that point I should be able to dial it in much further. As for amps, I’ve been happy enough with the EHTs that I haven’t thought about trying anything else (besides the SIT3 which was very nice but not like the EHTs).


I will say on the very slightly negative side that the Nenuphars seem to have a bit of a …. not sure how to phrase it. I hear it as a certain lack of resolution in the bass as compared with the mid and high freqs. Or maybe you could say they have a dip in the lower mids or upper bass. I take this to be the crossover point between the driver and the cabinet and as such it makes a lot of sense to me that the subsequent efforts from Cube Audio appear to be concerned with bass reproduction (larger drivers and subwoofers). That said, the bass can be immensely satisfying on the right recordings (acoustic basses often sound just right), and I take this to be an inherent aspect of this kind of speaker design (if you need a car for shopping you wouldn’t pick the Lambo).  


also I found Stillpoints Ultra SS to work well in place of the OEM spikes at the front of the Nenuphars. There are adapters made by Stillpoints that work perfectly - I’ll get the name and measurements if anyone’s interested. 


@charles1dad Thank you for your comment. I had been planning to write a post on this for some time but I suppose I needed a nudge.

@stephendunn I’m not sure I can be of much help in acquiring these. I originally spoke to the US dealer about the EHTs (Audio Arts in NYC) about 2.5 years ago. At that point they were $15k retail but there was no demo pair to listen to (that might be contributing to the obscurity of these amps.) I wound up finding a pair at a more reasonable price after a very long wait but I’d rather not go into the details online (not to be secretive, just respectful of others involved). I don’t know what the situation is now with Thoress’ US representation but I expect that the price has risen. The amps have changed slightly too (since Ebaen's review) - they now go up to 50w as the Positive Feedback piece mentions (40 before) and the color is green rather than black.


@stephendunn Glad you got in touch with Reinhard and got some up to date info. I can't recommend him highly enough as a businessman, electrical engineer, aesthetic designer and builder (though maybe not as webmaster! lol. I don't think the EHTs have ever had a presence on his site).  
I’ve also found a modest but worthwhile improvement using Stillpoints in place of the factory spikes. Stillpoints makes some adaptors that work for the Nenuphars too. I think they’re for the Acoustic Zen Adagios, going from 1/4” to M6.