Would a rug make any difference to sound quality?

From what you describe, yes it would.  There are quite a few threads on here about room acoustics.  Worth doing a search.

Suggest you take it as far as you can live with. I suspect 'just a rug' will not have a huge effect but experiment maybe with old blankets & quilts ?? Sounds a bit naff but it may give you the answer - Is spending £XXXX worth it.

Pix & details may help as always

Thank very much for your thoughts.

I tried uploading a photo but could not work it out.

I will try a few blankets to start with but I think I will give the rug a shot. Even if it only makes an ounce of difference I will be pleased.

Anything that you can do to make the room less reflective and "live", the better.

Carpets, curtains, soft furnishings, plants, bookcases, canvas paintings, linen type rugs/tapistries on the wall etc.

If you clap your hands in the room, you don't want to hear an echo or reverb.

Leather Couches reflect sound as well you will be dismayed to know  - sorry about that ....

Material all the way for sofas

Your best bet is to try a rug and try and sit as close to the speakers as you can and off the back wall, with a good amount of toe in, then hopefully the reflecting walls will be far enough away not to effect too much.  But high reverb in that room is inevitable especially with bass - some eq for the bass will definately help

The rug has just arrived. It has definitely made a difference, especially with the bass 

Even my wife noticed the difference so it shouldn't just be my imagination playing games.

I think my next step will be to change my thin curtains for something a bit thicker. 

Thanks for everyones' suggestions 

A wife also makes a good acoustic absorber. Get her to lie on the rug and adjust crossover frequency accordingly.  ;) 

have a look at these Genelec guides. Tehy will give you some background knowledge and also help underrstand what to do and where to do it e.g. where to hang some artwork serving as absorbing surfaces - which is another thing you can do.

before you buy anyhting you can try hanging some blankets in those locations to see what the likely effect will be.

http://www.genelec.com/learning-center/presentations-tutorials/placingloudspeakers/

http://www.genelec.com/documents/catalogues/Genelec_Monitor_Setup_Guide_2011.pdf 

AlmaaaaaKTz ? Hya. Good links for basic starting point explained well. Seen much before but nicely consice. Thanks

Marble floors - ooooh, get some carpet down....

I live in Hong Kong and it is too hot and humid for a carpet. A rug is really as far as I can go.

my other house has hardwood floors, i put a rug down, and it made a dramatic difference. 

my new house is fully carpeted, and the room is bigger, it has taken months for me to get used to the sound.

i'm using exactly the same components as before and the sound is completely different.

Not surprised bigfish. The system sound is 60% kit & 40% room I'd say.

+1

Invest into some bespoke art acoustic panels. With nice pictures on them these panels won't spoile your large room, and also will  help to control sound reflections.

What size of rug ?