As much as the Focals might appear to be the culprit may I suggest looking at a couple areas.
One: Interconnect cables. They have an across the board contribution to the system's sound. When you find an interconnect that is a good sonic match for your system it will be easy to hear. If your system is bright you may want to try some interconnects that are known for midrange. Sometimes a lack of midrange makes the system sound bright when in reality it is missing some midrange.
Two: Speaker cables. These go as a pairing with interconnects. This one is really tricky because there is a bunch of opinions out there on what speaker cables "sound good." My own experience using many of the more famous and most expensive cables is that cost has no connection with performance in YOUR system.
The biggest factor with nearly all cable designs is distortion from skin effect. This takes a toll on the highs and makes the presentation sound rough in the highs. This sounds bright to most people's ears. When you use some cables that do not have skin effect the sonic results are like a new world of sound. The highs are still present but they are clear in a way that sounds smooth and organic. They sound natural and blend with the midrange that gives the best of both worlds. Detail AND warmth.
How do I know all this? By trying a lot of cables and getting frustrated. So I made my own! They have almost zero skin effect and I love them.
Three: Some amplifiers can lean towards a bright sound. I am not an amp designer so I cannot explain the why of it. But some amps just sound strained. I know you are not looking to change amps but its worth mentioning.
Luke Zitterkopf
Aluminous Audio
One: Interconnect cables. They have an across the board contribution to the system's sound. When you find an interconnect that is a good sonic match for your system it will be easy to hear. If your system is bright you may want to try some interconnects that are known for midrange. Sometimes a lack of midrange makes the system sound bright when in reality it is missing some midrange.
Two: Speaker cables. These go as a pairing with interconnects. This one is really tricky because there is a bunch of opinions out there on what speaker cables "sound good." My own experience using many of the more famous and most expensive cables is that cost has no connection with performance in YOUR system.
The biggest factor with nearly all cable designs is distortion from skin effect. This takes a toll on the highs and makes the presentation sound rough in the highs. This sounds bright to most people's ears. When you use some cables that do not have skin effect the sonic results are like a new world of sound. The highs are still present but they are clear in a way that sounds smooth and organic. They sound natural and blend with the midrange that gives the best of both worlds. Detail AND warmth.
How do I know all this? By trying a lot of cables and getting frustrated. So I made my own! They have almost zero skin effect and I love them.
Three: Some amplifiers can lean towards a bright sound. I am not an amp designer so I cannot explain the why of it. But some amps just sound strained. I know you are not looking to change amps but its worth mentioning.
Luke Zitterkopf
Aluminous Audio