"The X3 motor system uses double copper caps on the pole rings for high flux and low inductance. The use of copper caps trickled down from our Z range. Copper responds to flux changes to flatten the inductance curve and lower the electro-magnetic resonance. Lower inductance also means fewer spikes in the impedance curve. Both result in an easier amplifier load. Dual pole rings increase efficiency whose flux loss is compensated by a larger magnet. The tweeter has the same design as all other Børresen speakers but with a reduction in magnet/iron mass made possible due to the original 94dB efficiency which is now 88dB. The planar tweeter operates from ~2.5 kHz up with a moving mass of just 0.01 grams. High mechanical robustness handles very high transient power. The parallel crossover uses the same high-quality parts as the Z range for minimal self resonance. The cabinet is finished in black or white gloss lacquer reinforced with optical carbon fiber inserts and vented with six bass reflex ports. The tweeter vents too to compensate for air-pressure build up."

For final specs we get…

… dimensions of 129 x 34.5 x 60.7cm HxWxD; 55kg; 35Hz-50kHz bandwidth; 90dB sensitivity; 4Ω nominal impedance; and dual 4½" woofers for the 2.5-way array's 'half-way' bass section.

The cutaway cabinet drawing shows how the two woofers occupy their own chamber to separate from the top two drivers; and how their chamber is stiffened with two perforated cross braces.

€10K/pr and budget/affordable remain at odds in most people's minds. The X3 simply remains a high-performance design with custom parts and rear-slimming cabinet. It's far from affordable per se, just the current entry to Børresen whose team is allergic to me-too. When a car flies the Daimler-Benz star, one can only go so low before it must wear a lesser badge. Fence sitters could wait on an X-range 4" 2-way monitor; if such a one is even on the drawing board.

What's already here is the €20K/pr X6. But today is all about the X3…