need advice for sound improvement


Happy New Year everyone!
I would appreciate your help to improve the sound I can get in my listening room from the following system:
- Marantz SA14s1 SE (Ken Ishiwata)
- McIntosh C2200
- McIntosh MC2102
- PMC OB1i
- Wireworld Equinox 5 balanced interconnects
- Black Rhodiun Salsa speaker cables 10 m runs
My room measures L470 x l330 x h240 cm and has one door behind the speakers and one door on the right wall (as I face the speakers). The speakers are places facing the short wall.
I encounter two issues:
1. I cannot find the proper bass sound. Or it is boomy, or it hangs over or it is very thin (good definition but lacks the oomph)
2. The vocals are placed at 1 o'clock (imagine the speakers sitting at 3 and 9 o'clock)

What can I do to improve on the above?
darafifi
Dear Helomech and dear Willemj

Thank you for your advises.
I will use them.
Currently the speakers are placed at 134 cm from the back wall and at 83 cm from the side walls. This location has improved the sound compared to earlier placements, but I feel that there should be "room" for even better.
10m speaker cable runs are very long. Try moving the speakers closer together. Put some cushions on floor near speaker ports.

Buy Jim Smith's book Get Better Sound.
Read it.
Read it again.
Follow his instructions.
Get your setup correct.
Install acoustic treatment.
Sit back and be amazed how much better your current system now sounds.

The room dictates the sound. No gear can overcome that. You have to get the setup correct. No shortcuts.

Tom
FWIW, I use and recommend acoustic panels from Primacoustic, purchased from Sweetwater Sound. Fantastic customer service, highly recommended. 
I'm not an owner, I'm just a customer. A very happy customer.

Tom