I have had the opportunity to listen to the whole range of Spendor Classic line (2/3, 1/2, 3/5, 100) and the 2/3 came out as the brighter. It was the only one of the range I didn't like. It was too bright and distracted my attention from music.
If you don't like 'bright', perhaps you should start by choosing the right speaker, as someone else suggested before in this thread.
Regards,
Chema