emaidel was right about the Hi-Fi Tuning fuses

[Feanor]

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It is truly difficult to conduct a DBT when one such as you doesn't even know what it is exactly. I have pointed out the practical limitations in my case.
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rw

And I was quilty too of the careless use of "DBT". However, E-Stat, as you & I discussed, the particular distinction between "single" and "double" blind in this case, preventing administrator bias, is insignificant in case of relatively simple audio testing. I feel you are beating 3LB a bit too hard on the DBT definition aspect.

I've said I thought I heard a dfference using Hifi Tuning fuse a direct signal path, specifcally a tweeter fuse. However I'm not sure I could pass an SBT -- or DBT; in fact I did't even do a non-blind A-B series. I just stuck them in , thought I heard a very small improvement, and left them there.