monitor 70 series II

31VOLDOG

I'VE HAD THESE SPEAKERS FOR SIX WEEKS USING AN ONKYO TX-NR509. i WAS VERY PLEASED WITH THE SPEAKERS AND HAD NO PROBLEMS UNTILL LAST EVENING. I THINK THE SPEAKERS MAY HAVE 'BLOWN', BUT NOT SURE. VOLUME SUDDENLY IS APPROX 25% OF WHAT IS WAS OUT OF THE BOX, AND SEEMS TO HAVE NO TWEETER WORKING. ANYONE TELL ME IF THEY'RE BLOWN?
THANKS,
JI