I suppose if you really like the sound from 1 brand, and you like the physical look no reason not to go with one brand. Generally, there is no sonic benefit.
In practice individual brands will do some things better than others. For example their amps might be good, but their CD players not so much. Most people like to mix and match to take advantage of individual brand strengths. Synergy becomes more of an issue with speaker/amp matching - particularly as it relates to amp power/quality and speaker impedance/efficiency.
In practice individual brands will do some things better than others. For example their amps might be good, but their CD players not so much. Most people like to mix and match to take advantage of individual brand strengths. Synergy becomes more of an issue with speaker/amp matching - particularly as it relates to amp power/quality and speaker impedance/efficiency.