yes, most of the AMP can convert ANALOG signal (INPUT - composite, component) to HDMI signal (OUTPUT - Digital) ...but cannot convert HDMI signal (INPUT - Digital) to ANALOG signal (OUTPUT - composite, component)...
If you MUST convert digital HDMI output signal back to Analog composite/component signal, you will need an extra converter...
3DTV: Panasonic P42GT20H (Nano 305)
AMP: Pioneer VSX-1020 (MAS 50A HP)
BDP: Panasonic DMP-BDT300
F: Roger CS9
C: Bose VCS10
S: AR
SB: Atlantic 153c
FH: MB Quart 460
PB: Belkin Pure AV PF-30
may be HDCP issues ???
you can't convert HDCP signal back to component/composite signal only with a cable.
more info about HDCP -> http://www.digital-cp.com/