I just replaced my Transparent Ref, XL (MM2) jumpers With High Fidelity New CT-1 level 2 jumpers. Use them from mid range to tweeter and WOW Very big improvement. B@W 800 Matrixs speakers, They are not coming out. Clarity and Realism Just jumped higher for the better. Very defined with out any harshness almost 3D sounding if you will. i had them on trial for a couple weeks and purchased them.