Zu Audio Dirty Weekend Loading Resistors Upgrade

So, an engineering ponder from a non-engineer:

The Zu Dirty Weekend speakers offer an upgrade during the purchase process- 25 OHM SPEAKER LOADING RESISTORS for $20, or 10 OHM SPEAKER LOADING RESISTORS for $22.  I plan on attaching the DWs  to my PowerNode 2i.  Tony at BlueSound assures me the PowerNode 2i will do fine driving the 12 ohm DWs  (at 40 Watts, I might have to turn up the volume a little).  I am not familiar with resistors use with speakers.

1- Do resistors really make a noticeable improvement with speakers?

2- If so, should I get the 25 ohm or 10 ohm resistor?

Anyone out there have experience hooking up DWs to a BlueSound product?
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Thank you, whoopycat, I’m leaning that way.  Definitely getting the capacitor upgrade. 
I went ahead and ordered the Zu DWs with the Clarity Cap upgrade, and passed on the resistors. They arrive around November 13.  Thanks for your input. 
Right on, enjoy!  Post back with your impressions.