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Not sure when the 406 was originated, but it might be basically a design from the tube era, that is, higher impedance amp output.

Also your expectations for the Bolero to be a rock monitor may be...

The midrange is supposed to be one of the high points of that speaker. If you are hearing muddled midrange and no bass, it might be worthwhile checking to make sure the woofers are not connected out...

I remember reading a particular person writing with such fervor about his experience with the Bolero I was sure he must have been weeping with gratitude as he typed. I believe that in the same time...