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It can be true, because if you solder wires to a speaker, the solder can go by capillaries in the wire between post and voice coil to stiffen it. Again, good soldering can be learned.
So subjective and may be limited to our few testers. Meaning I might well hear it differently. Meaning, well....there is no meaning to your post. It is devoid of information.
Think about how many soldered junctions exist in an amplifier and a passive speaker (crossover, driver itself) and how much influence another properly soldered junction can have.
We found that crimp speakers exhibited a more natural, bright and transparent sound.
Soldered speakers, on the other hand, sound harsh and lack penetration.
It's funny how people also "find" the exact same things when they put silly magical stickers, "dots" or stones on their gear
Sorry to be blunt, but if you don't do this "experiment" double-blind and repeated enough times to account for dumb luck, you'll have no chance of being taken seriously.
Basic knowledge about conductivity and electricity tells us that your odds of proving the claims are slim to say the least.
Crimping and soldering are two different ways of creating a cable connection. Soldering creates a connection by using a heated metal to connect two wires. Crimping creates a connection by using a special tool, known as a crimping tool. Typically the easier and more efficent way of creating a...
We found that crimp speakers exhibited a more natural, bright and transparent sound.
Soldered speakers, on the other hand, sound harsh and lack penetration.
For OP, I suggest you look into some of the basics of using controls during subjective testing, then if you decide to try it again you can let us know how it goes.