Jumpers and attenuators on Magnepans.......

Hi Guys,

I have been thinking about bi-wiring my 1.6s and a few people suggest I would be better upgrading the jumpers. I would like to know if I have downgraded my jumpers by putting on the attenuators supplied as stock with the 1.6s - these look like nothing more than a paper clip with a little block of chalk attached. If upgrading jumpers makes quite a difference then I suspect these paper clips are downgrading the sound, although they have helped with the harsh highs. Is it possible to buy better quality attenuators than the ones supplied by Magnepan as standard?