The second link is dubious because one of the several blogs that linked to it mistyped? If you have a problem with the actual methodology as outlined in the test itself, by all means bring it up, but the original poster is not responsible for blogs that misreport.
As for the following three, just because you can't access the articles doesn't mean they don't exist or are thereby discredited. One of the links was done at MIT by a professor there, and involved a sample size of 24. Another was a literature review done at UCSD and discusses the carver challenge. The author is actually a believer and I don't agree with 95% of what he writes about, but the section on blind testing, specifically the carver challenge, is informative. A lot of it is warrantless, but I linked to it to provide some balance and because what is substantial is interesting. The final link is the opposite - laden with blind test analysis, but written with a more skeptical slant. It is also a literature review from Brown University.
No the second link about the monster cable is dubious...read what it says.
They had Martin Logan SL-3 speakers and hooked "them" up with 2 meter speaker cables. Acording to the artice they used "Monster Ultra Series THX 1000 Audio Interconnects" not "Monster Ultra™ Series THX® 1000 Speaker Cable"
Then they took 4 coat hangers and made a pair of 2 meter speaker wires. Every speaker wire I have seen has a positive and a negative running to each speaker "unless they are run in series". How do you get four 2 meter wires (8 meters total) out of at best 4 meters of coat hangers? Did they only hook up one speaker with coat hangers? When they twisted them into a pair of speaker wires what did they use as an insulator?
To quote this as a DBT test is flawed in every way, except if you acknowledge two of the original five (not the morphed twelve) actually were able to tell monster cable from Beldin wire not once or twice but 7 times in a row. (cynical)
In one of the three links I can not access, is "the Carver challenge" in reference to Bob Carver and amplifiers? Are these links actually DBT on cables? Could you share some info ie. brand and type (interconnect, speaker, power) of wire used. And a brief synopsis of the results.