I can't speak to how the Supra 4.0 would sound but I have the 3.4W and the 2.5 and the 3.4W is a big step up in sound quality. I don't use either anymore, which is not a knock on Supra.
Supra is fairly inexpensive so if you like the Supra house sound (which is very pleasant and easy on the ears) then going for the 3.4 might be what you're looking for.
All the best,
Nonoise
Supra is fairly inexpensive so if you like the Supra house sound (which is very pleasant and easy on the ears) then going for the 3.4 might be what you're looking for.
All the best,
Nonoise