Cube Audio Nenuphar Single Driver Speaker (10 inch) TQWT Enclosure

If not returnable, you could cut the threaded section. If it is an insert, you can remove it and use the adhesive disc (which will cover the insert hole).

This is an amber alert regarding using resistors between positive side of speaker cables and the VR L2iSE output terminals.  I just removed my Dueland 1ohm resistors--put in place to lower dampen factor--and realized a big jump in sound quality, specifically in the highs which improved imaging, depth and detail. This was not a subtle change. When I originally installed the resistors I was using Synergistic Foundation speaker cables and the improvements the resistors made was tangible, easy to hear.  But when I replaced those cables with Shunyata Alpha NR2 cables I simply installed them with the resistors assuming the same benefits would apply.  I was very wrong.  For whatever reason, the Alpha's increased resistance, the different technology Shunyata uses, whatever, the resistors actually hurt the SQ.  So vinpic and others who might be considering using resistors in this manner, please be aware that the improvement may heavily depend on the type of speaker cable you are using.  When I installed the Alpha speaker cables at first with the resistors I heard so many changes/improvements that I didn't think to try them without the resistors.  I only removed them now out of simple curiosity to be able to talk about their benefits.     

Stephen,
What you discovered makes sense. Your two different speaker cables could have relative meaningful differences in their gauge, resistance and capacitance. These variables could definitely affect/ impact the total amount of the damping factor (DF). The final DF value factors in speaker impedance and speaker cable contributions (And obviously amplifier output impedance) . Just goes to show how valuable our ears are. You clearly heard a change.
Charles

And most critically for the objectivist "it's all in your head" crowd, the change was contrary to the previously developed preferences and expectations. 

Sure, you could also blame a bad mood at the time of testing, but in line with Charles' sentiment, it's clear that our ears are meant for hearing and they do a wonderful job. (Despite the constant biasing influence of extra-auditory factors) 

Additional info on the Valvet E2SE

Please give the SE version PLENTY of time to break in. Several hundred hours or more, at least. This is from experience.

I had already listed mine for sale and made a deal when that magical moment arrived. I did not want to break my promise but will consider replacing it when the time is right.

I don't know how it will pair on the Core Audio speakers but it is an absolutely wonderful and amazing amp.

The new owner is ecstatic.