Hi -
Herb Reichert reviewed the Golden Ear BRX speakers a few years back. In the measurements section, there was a mention about speaker height. I have attached it below.
Rich
Fig.4 shows the GoldenEar’s horizontal dispersion, normalized to the response without the grille on the tweeter axis, which thus appears as a straight line. The apparent peak at 3.5kHz to the speaker’s sides is likely due to the small peak between 3kHz and 4kHz increasing in amplitude off-axis. The BRX’s radiation pattern narrows a little at the top of the woofer’s passband. Similarly, the tweeter becomes more directional above the cursor position in this graph of 14kHz. Other than those issues, the contour lines in this graph are relatively evenly spaced, this correlating with the stable stereo imaging I noted in my auditioning. In the vertical plane (fig.5), again with the off-axis response normalized to the tweeter-axis response, the small peak in the presence region flattens out 5–10° below the tweeter axis, which presumably is why GoldenEar recommends using a stand with the BRX that is sufficiently high to place the listener’s ear just below the tweeter axis.