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The Boston Acoustics CR57 came up in the What budget speakers you like to see reviewed? thread. I took some measurements of these speakers in 2015.
These measurements are certainly not the equivalent of a Klippel scan, but may be nonetheless of interest. I do not remember anything about the measurement conditions, though it must have been indoors and the measurement equipment would have been Cross Spectrum calibrated Dayton microphone and Focusrite 2i2 with loopback correction.
I think I played with these speakers with an eye to making an active 3-way with a DSP by the German company Reckhorn. I did not go forward for a variety of reasons
Here is the on axis response:
Listening Window Frequency Response (CEA-2034)
Horizontal Polar Map
Horizontal Polar Map (Normalized to the on axis response)
Raw responses of Midwoofer and Tweeter
Tweeter Raw Polar Map
These measurements are certainly not the equivalent of a Klippel scan, but may be nonetheless of interest. I do not remember anything about the measurement conditions, though it must have been indoors and the measurement equipment would have been Cross Spectrum calibrated Dayton microphone and Focusrite 2i2 with loopback correction.
I think I played with these speakers with an eye to making an active 3-way with a DSP by the German company Reckhorn. I did not go forward for a variety of reasons
Here is the on axis response:
Listening Window Frequency Response (CEA-2034)
Horizontal Polar Map
Horizontal Polar Map (Normalized to the on axis response)
Raw responses of Midwoofer and Tweeter
Tweeter Raw Polar Map