X3 / USER GUIDE 5
The tweeter
The tweeter chosen for the Børresen X3 has the same design used in all other
Børresen loudspeaker series. However, there is a reduction in magnet and iron
mass. This is possible due to the extremely high eciency of the original tweeter
design. As a result, the eciency has dropped only slightly from the exceptional 94
dB to 88 dB, but this is still an amazing eciency for a tweeter.
The tweeter operates from about 2.5 kHz upwards. The moving mass is extremely
low at 0.01 grams. The fully concealed tweeter can operate at an impressive
speed. The high robustness of this tweeter allows it to handle very high transients
without causing any deafening dips.
Crossover
The Børresen X3 is equipped with a parallel crossover built with the same high-
quality components from the Z Series. This makes for a very mechanically stable
crossover that minimizes its self-resonance.
The cabinet
The surface of the cabinet is nished in black or white piano lacquer and
reinforced with optical carbon ber inserts. The cabinet is made of a heavily
braced wood composite material that has the property of eliminating sound
distortion. The material used for the cabinet also reduces mechanical inuences,
especially hysteresis. The sonic result is clearly audible. The Børresen X3 cabinet
has six bass reex ports. The tweeter is vented to compensate for the air pressure
that builds up. The bass section consists of tuned ports calibrated for musically
relevant frequencies.
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