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These AN’s are small full range drivers, and as with most are limited to downside hence employing them for the 300+ range. I have their 6.5’s and have posted actual freq measurements cleanly through 20K Hz. I’m giving these a go looking to see how they comp at voice and high range. But heck, not many of us beyond 40 somethings can hear 20K Hz, or 18K Hz, or…. (ouch the truth hurts).
I’ll admit, I prefer to avoid placing crossovers into the ear’s highest sensitivity range (!-5K Hz) for having to manage all sorts of nasty reasons; phase, timing, playing same signal over two separated sources beyond ½ wavelength… while a first-order can cleanly address the first couple of issues, the later is unavoidable (but generally of minimal affect)