I am not so sure that some improvements would be so easy to hear on a really crappy system. The fact of the matter is not all systems resolve as much information as others and we don't all have equivalent hearing. I am certainly not suggesting that I agree with most of the tweaks out there, but there are some very real differences in equipment. Changing between a mosfet and SET amp in my system made a very real and dramatic change... objectively the measured frequency response between the two amps was essentially unmeasurable using CLIO to measure the speakers... another change that some would call a tweak, using an outboard DAC instead of the one that came with my mid-fi Sony really helped there as well... would I hear these improvements through an old Advent speaker? Probably... but I bet it would be harder to hear the improvements. Could my tone deaf dad, who needs to have the TV blasting for him to hear the dialog notice the improvements? I really doubt it.
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