Phase Technology PC-8.5 speakers sound flat


Hello,
I recently purchased a pair of PC-8.5 speakers and recently hooked them up to my recapped Pioneer SX-850.  They sound completely flat with no high end.  Has anyone had experience with them?  Could it just be tweeters, or somethin I am missing?  Any direction very much appreciated.
What is the purpose of the gold clips between the two positive and two negative speaker connections?
Thank you.
jack5j
Thank you!  I reversed the connections and ran the speaker wire to the tweeter connections instead of the woofers.  HUGE difference.  I also ordered some new jumpers to replace the clips.  They sound MUCH better!
The gold clips are jumpers for the woofers and tweeters.  The2 positives and 2 negatives need to be connected.  If not, no highs.