This shift of compression load allows {HEAD ~ the load} on {TAIL ~ the compression drivers} on both cycles to be balanced 
on
This shift of compression load allows { HEAD ~ the load } on { TAIL ~ the compression drivers } on both cycles to be balanced
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH