Bob,
Dr. Floyd Toole is an executive at Harmon (JBL) - I believe your speakers are designed using Toole's approach - wide even dispersion with useable signal up to 80 degrees. Most all nearfields are designed this way - and many have a waveguide so that tweeter matches the woofer in dispersion at the crossover. I'd bet your speakers are probably peerfectly flat up to at least 30 degress off axis.
Dr. Floyd Toole is an executive at Harmon (JBL) - I believe your speakers are designed using Toole's approach - wide even dispersion with useable signal up to 80 degrees. Most all nearfields are designed this way - and many have a waveguide so that tweeter matches the woofer in dispersion at the crossover. I'd bet your speakers are probably peerfectly flat up to at least 30 degress off axis.