Cable upgrade

Thanks for your feedback
Just wondering why you changed over from your dynaudios to Tannoy?
Did you find the Synergistic cables warm sounding with no loss of details?
Thanks

I think for me I'm looking for a more open sound when watching movies.
When I have action and dialogue in a movie sometimes I find it hard to hear what the actors are saying.
I'm not sure if it's just my room or cables that I'm using for the 3 fronts?
I use Audioquest Cv4.2.
The room is 5 meters x 4 meters have a large rug in the middle of it.
Big wooden coffee table in the middle.
Timber blinds on one side of the room and half opened on the other side which gose into the dinning room.
Also have a large L shaped couch.
What do you think my dialogue issue is?

Center speaker is only 2 months old and has been rated to be quite a good center speaker.
I am using the Bryston bbs2 for my contour 5.4 fronts and am using the Arcam avr 600 to drive my rears and center.
I'm not to sure where I'm going wrong?
If it's the Arcams preamplifier section then what would you recommend?
I have tried different cables such as Tara labs vector 2 and chord signature and did hear a difference but these were only minor differences.

I just tried some nordost Valhalla cables for front three speakers and it made a huge difference to the sound.
The clear opened sound that I was looking for these cables gave me.

I had tried to up the level of the center speaker but found that these cables made the biggest difference.
The sound for movies is so opened I can understand everything that is going on.