The things are simple. Let's try to clear them up. From the
pre-out of the
Marantz SR6004 you have to feed the signal to the Harman
Kardon 3385
main-amplifier inputs and from the HK3385
speakers out you have to feed the signal to the Bose speakers. If you want to use an external equalizer you can connect the cables from SR6004 to the
inputs of the equalizer and the cables from HK3385 main-amplifier inputs to the equalizer
outputs. For all these connections except the speakers one you will use RCA cables like
these. The quality - cost of these cables is up to you to decide, since the difference in audio quality between the cheap cables and the expensive ones is not very big and most of the users can't listen the difference. In the following picture I tried to create a drawing for your equipment, including the equalizer option:
If you have a particular equalizer to use, just post me model / brand to give you more connection details.
In case of a problem or clarification or further details needed, don't hesitate to post me a reply before rejecting my answer.
If you are satisfied, accept my solution. Thanks and regards
Stelios
direct
fixya link: http://www.fixya.com/users/technical114