I think most of these comments are well wide of the mark.
The OP has spent a four figure sum with a dealer who clearly did not listen to him, produced a sound that was unimpressive.
Why the OP actually bought the system I do not know but it is clearly not what he wanted or what he expected. What the OP needs is guidance as to what he can and can not expect for his money and help in putting a setup together that actually addresses his requirements.
This is best done with a dealer who will listen to you, demonstrate what can and can not be done, explain the futility of trying to get decent sound out of old cassettes and address all the rest of the issues the OP has. Do not take the dealers word on how highly rated the product he wants to sell you is, get him to prove what he says by demonstration.
As for this thread, just recommending that he swap one bit of gear for another, quite possibly equally as unsatisfactory, is not the way to go.
Go and get your money back....!