From the Vandy FAQ, it looks like the 1ci came out around April, 2010 and has a new tweeter and new binding posts.
--------------------------------------------
Greg (3/21/11): Richard, Can you tell me the difference between the 1C and 1Ci. I couldn't find anything on your site about it. I'm sure there are others out there with the same question. Thanks,
Answer: HELLO GREG, THE ICi HAS A NEW TWEETER, NEW CROSS-OVER WITH IMPROVED COMPONENTS AND TERMINAL INPUT CONNECTORS.
----------
Timothy (4/01/10): I'm wondering what exactly is the differences between the Model 1, 1b, and 1c thanks.
Answer: HELLO TIMOTHY, THEY ALL ARE 8 INCH 2 WAY TIME AND PHASE CORRECT SPEAKERS THAT LOOK MOSTLY THE SAME ON THE OUTSIDE. OVER THE YEARS THE INTERNALS HAVE BEEN UPGRADED WITH SUPERIOR COMPONENTS. I THIS HIGHLY COMPETITIVE INDUSTRY YOU CANT MAKE THE SAME FOR THAT MANY YEARS AND REMAIN IN BUSINESS. THERE WERE TOO MANY CHANGES TO GET INTO HERE BUT EVERY UPDATE WAS CONSIDERED A SIGNIFICANT ONE BY ALL. AS A DESIGNER IT IS IT IS A HOOT TO BE ABLE TO REFINE THE DESIGN WITHOUT HAVING TO REINVENT THE WHEEL EVERY YEAR OR SO. BUY THE WAY IT HAS JUST BEEN UPGRADED TO THE 1Ci.
--------------------------------------------
Greg (3/21/11): Richard, Can you tell me the difference between the 1C and 1Ci. I couldn't find anything on your site about it. I'm sure there are others out there with the same question. Thanks,
Answer: HELLO GREG, THE ICi HAS A NEW TWEETER, NEW CROSS-OVER WITH IMPROVED COMPONENTS AND TERMINAL INPUT CONNECTORS.
----------
Timothy (4/01/10): I'm wondering what exactly is the differences between the Model 1, 1b, and 1c thanks.
Answer: HELLO TIMOTHY, THEY ALL ARE 8 INCH 2 WAY TIME AND PHASE CORRECT SPEAKERS THAT LOOK MOSTLY THE SAME ON THE OUTSIDE. OVER THE YEARS THE INTERNALS HAVE BEEN UPGRADED WITH SUPERIOR COMPONENTS. I THIS HIGHLY COMPETITIVE INDUSTRY YOU CANT MAKE THE SAME FOR THAT MANY YEARS AND REMAIN IN BUSINESS. THERE WERE TOO MANY CHANGES TO GET INTO HERE BUT EVERY UPDATE WAS CONSIDERED A SIGNIFICANT ONE BY ALL. AS A DESIGNER IT IS IT IS A HOOT TO BE ABLE TO REFINE THE DESIGN WITHOUT HAVING TO REINVENT THE WHEEL EVERY YEAR OR SO. BUY THE WAY IT HAS JUST BEEN UPGRADED TO THE 1Ci.