Mskeen,
Haven't heard the 502a and Usher combination you mention, but I would think they would sound very well together. Perhaps you might want to sent an email to Bill Baker at Respond Audio asking him this question. Bill is well known for his "mods" to Jolida amps, and until recently used to be an Usher dealer. If anybody would know how Jolidas and Ushers sound together it would be him.
Anyway, here's a link
http://www.responseaudio.com/
Haven't heard the 502a and Usher combination you mention, but I would think they would sound very well together. Perhaps you might want to sent an email to Bill Baker at Respond Audio asking him this question. Bill is well known for his "mods" to Jolida amps, and until recently used to be an Usher dealer. If anybody would know how Jolidas and Ushers sound together it would be him.
Anyway, here's a link
http://www.responseaudio.com/