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
@stephendunn There are certainly posters out there who's ears I trust that use and enjoy digital correction.

Unfortunately my only experience was *not* good. I had a Lyngdorf tdai-3400 for some time and turning on room perfect kind of made me sick to my stomach... the music sounded "blended" for lack of a better term. Definitely less natural than without.  I had the amp for about 6 months, so I knew it well and had obviously done RP setup many, many times. Just couldn't get it to sound right with my Coincident PREs. Every time I turned off any form of digital processing it got better actually, but never quite right.

Very curious to hear about your experience and add another data point.
Bob, you will probably need longer spikes if the carpet is thick, in order that one maintains the gap as intended. Or arrange for them to stand on something solid.
Since many people in here are considering the bakoon 13r, I thought I'd quote a post from @almarg on the input impedance:

"Re the Bakoon 13R, be aware that the input impedance of its RCA input is only 10K, which will not be a good match for many and perhaps most tube-based components.

I believe the other input choice provided by the 13R, a "Satri Link," would only be usable if driven by a Bakoon component providing that kind of output.

Regards,
-- Al"
Not sure that's going to effect too many people. Multiply by 10 to get your number.  REF 10 by Audio Research comes in about 60% of the Input Limit.  The Luxman C900 comes in at 10%. I'd love to see a list of how many amps would go over that 10K figure....maybe some Boutique stuff.

You wouldn’t want your preamp output impedance to be more than 1/10 (preferably 1/20th) of the amplifier’s input impedance. Al’s correctly points out that some tube preamps have output impedances that can exceed that level (particularly at certain frequencies). Good warning from Al. Not an issue with nearly all solid state preamps. To be clear divide the amp input impedance by the preamp output impedance.

Charles