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Message: <blockquote data-quote="Mr. C" data-source="post: 5769592" data-attributes="member: 574198">They started the different numbering scheme with a handful of the blue heatsink opti's.  The "2" designates 2-channel amplifier.  There was a 4100 and a 4200 later on also.  "4" meaning 4-channel amplifier.Same amplifiers, same internals, just slightly different naming.  Then the heatsinks went to the powdercoated black heatsinks with the same style of lettering and numbering, but in gold colored graphics.  When the lettering and numbering graphics changed, that was when Pyramid bought the company.Used to have a few of the old OptiDrive amps and I loved them.  Very clean sounding amp.  Pretty much does it's rated power and not too much more, but at low distortion levels with an excellent s/n ratio.</blockquote>

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