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 Thanks for the additional information regarding resistor setup, much appreciated.

That would actually be a series connection. In parallel circuits, electricity is flowing through two independent circuits. If either is cut, the other circuit will be still be conducting electricity (think modern Christmas lights where breaks in the circuit, i.e. a burned out bulb, don't cut out the whole stand). Alternatively, in a series circuit, each component is an integral part of the circuit and if it breaks, no electricity flows (i.e, old Christmas light strands where every bulb needed to be tested to find the fault).

In this case your amp is producing electricity and the positive & negative wires complete that circuit and allow it to flow through the speaker. If the resistor were connected in parallel to that circuit, it would be connected to both the positive and negative terminals of the amp (or speaker). Cut one leg of the resistor and the full speaker circuit is still connected to both terminals, electricity flows, and the music continues.  Instead, you've got it connected in series with the speaker circuit. Cut one leg of the resistor and it breaks the circuit and there's no connection/electricity/music.
Stephen, might be worth looking at Dueland cast graphite resistors. Attach to high quality male and female banana preferably by crimped connections if possible or crimp to spade at amplifier end.
Series vs. parallel.

If the only link between the amp the speaker is through the resistor and then to the cable, then it would be in series.
If the resistor makes a looping connection in addition to the regular cable connection, then it would be in parallel.

It is still not clear to me which Vinnie suggested.
Robert
Nenuphar journey, part 3.

Now that the Nens were broken in, it was time to try different amplifiers. I had been using the LTA Z10 integrated. It sounded fine but lacked enthusiasm, a certain jump factor. Time to explore my FirstWatt collection.

First up was the J2, which actually exceeded my expectations. It sounded clearer than the Z10. The bass was fine, but the soundstage only average. Perhaps a pre would expand the soundstage. PRaT was good, restoring the jump factor. All in all, a decent match, so if you have a J2 don't throw it away. :-)

To be continued....