Are There Improvements that Can Be Easily and Quickly Made Without Buying More Stuff?


I appreciate that there are many people on this forum who have put a great deal of thought and effort into how to improve their audio systems.  Most of the discussion relates to upgrading equipment.  This is natural as most people here want to improve their music experience, and better equipment is a way to do that.  I’ve taken advantage of this and made 5 or 6 upgrades over the last year!  The result has been great!  But are there some simple steps that can be taken that can be overlooked by someone who is newer to audio?

As examples I’ve read that facing a sub towards something like the back of a couch will improve its sound.  And for rooms with bad effects that can’t be fixed, move the listening position closer to the speakers.

‘What is your best tip for improving sound quality without buying anything?

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As others have stated, it appears you have a very live and reflective room that needs taming. All of those reflections are smearing the sound from your speakers and creating a mess. 
 

I would look at adding a large rug as well as some decorative, acoustic panels to the ceiling, first. Like you, I would try to avoid blocking my view of the sea with window coverings.  On the other walls, I’d try adding more decorative panels in different sizes, wherever they could fit. 
 

That could be a good start. 

Yeah clean ears to start with for sure.
 

Understand what you are hearing and why. Then tweak tweak tweak the setup within the room accordingly. Set up the speakers just right for your listening position. Maybe add absorption at primary reflection points on side walls. Keep physical space between components and between components and any nearby sources of noise like power transformers, digital devices etc. That helps keep noise levels minimal.