I would cuggest the cardas golden cross, not the golden reference, the cross version is built to add a little warmth
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Here are a few different suggestions based on my experiences with Maggie 2.7QRs and from a close friend who has the 20.1s. Just to warn you, one or more of the suggestions you may make think are a little crazy but there was considerable time spent in tweaking to see what works and what doesnt.
With my 2.7QRs I kept the tweaks to a minimum. I was also looking to warm it up a bit with some cables but when a pair of Warner Imaging 300 mono amps became available I bought that to help. It really worked well in adding bass and providing an overall balance of bass with the mids and highs, while adding a good amount of amperage to the speaker to improve the overall effect. I will describe a little bit about what it did to the 20.1s a little later.
My friend has the 20.1s, which have been tweaked each month for at least the last year. Everything imaginable has been altered, some multiple times, to get them to where they are now. I originally thought the problem of lack of warmth and body was that a Classe amp with Nordost Vahalla speaker wires was utilized. I did not think that it could be accomplished with these pieces of the puzzle. As usual, my thinking was wrong again. But the most important question to ask youself is how far do you want to take it. Without a combination of changes I am not sure if the ultimate goal can be obtained but here are some changes that did make significant improvements in their own right:
(1) Changing from Nordost Vahalla wires to Jena Labs provided some of the impact you are looking for. It did provide more body to each note which made it fuller. It was not as extended in the top as the Valhalla cables but if you just want to change the cables only then this certainly should be considered.
(2) Have the speakers modified. A couple of people in Audiogon have changed the wires from the crossovers to the panels as well as changing the capacitors and other parts within the crossover itself. This also has made a tremendous improvement and the best thing is you can tweak the speaker to your listening taste.
After the capacitors were changed I brought over my Warner amps to try them again. They did not work as well this time as the Classe amp provided much better impact.
(3) The most unusual but significant impact was putting a Promethean stand from Machina Dynamica under the amp. I would have never thought just a stand by itself could add the warmth, add layers to each note providing weight to the instruments themselves, and providing a level of realism to the music. I never thought that a solid state amp with very detailed speaker cables could ever produce the warmth and body that made listening so enjoyable. It was amazing! Since this was the last tweak I am not sure what the impact would be by itself but I am certainly going to add them to my system.
I hope this helps in some way. It would be great if within Audiogon that lessons learned could be captured so that thoughts like these could be filed and obtained for interested parties.