You'll never know til you hear for yourself.
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I assume we're talking about the jumpers in the pre out/main in section of an integrated amp and not the jumpers on a bi-wire speakers.
If they are designed as kind of an on/off switch to merge the amp and preamp sections together, then how does it affect the sound whether or not you have an IC or jumpers?
What about the integrated amps that work without any ic's or jumpers in their path? Are they inherently better sonically because they operate without any jumpers?
I have had countless amps and receivers with the metals jumpers I have Audioquest (made by Audio Advisor) and Pure silver ones and have tried the true Audioquest ones. I have compared them all and they do sound different from ezch other and diifferent depending on unit. Notice I did not say better That is ones onwn call.
"... My brother has NAD that originally had factory jumpers made of "U" shape steel rods. Replacing them with short Audioquest jumpers (basically short IC) opened treble..."
I replaced the rummy factory metal jumpers in a NAD C370 integrated amp used in a prior "B" system, with two aternatives:
(i) inserted the Audioquest jumpers; and then
(ii) quality VDH 6 inch length ICs
Result: in both cases, a large progressive improvement ....(i) just by going to to the Audioquest cheapos; and then
(ii) a more subtle but appreciable further improvement when I upgraded to the VDHs (still have 'em kicking around in a drawer - guess it's time to sell them cuz I don'y use them anymore)
In any case, the factory stock metal jumpers are noticeably inferior.
In fairness, I also professionally modded/upgraded the stock power cord configuration to a quality female connector that permitted a use of quality external Power Cord instead of the crap hard-wired-in power cord that came with the unit. That also made a huge improvement.