I would definitely recommend replacing those stock jumpers. I had fatwyre.com make a pair of jumpers for my Spendor 1/2Es and my results were very good (and not too expensive). I am using Tara Labs Space & Time Phase II speaker cables, which are rather modest in price, and I had Fatwyre make jumpers out of the same cable.
The new jumpers made a major improvement in upper frequency reproduction. I should mention that it took many hours for the jumpers to settle - so don't expect great result right out of the gate. IMHO, spending $150 on jumpers to match your speaker cables will be money well spent.
The new jumpers made a major improvement in upper frequency reproduction. I should mention that it took many hours for the jumpers to settle - so don't expect great result right out of the gate. IMHO, spending $150 on jumpers to match your speaker cables will be money well spent.