Crossover and cabinet design
The output of the drive units is carefully combined by a thoroughly researched crossover developed using Wharfedale’s Advanced Software and Listening Iteration system. Each crossover is carefully evaluated using a wide range of music, with the emphasis being on the lifelike reproduction of voices and instruments in addition to the dynamics of the musical performance. Crossover components feature low-loss polypropylene capacitors and laminated core inductors for optimum transfer of the music signal.
The acoustically profiled cabinets feature 28mm-thick front baffles – a luxury, engineering touch to such low-cost speakers – profiled at the edges to reduce diffraction edge reflections at mid to high frequencies. Critical bracing of the cabinet panels contributes to the eradication of audible resonance and, combined with the rounded cabinet edges, yields a rigid base on which to mount the drive units. In addition, the cabinet walls are lined with a specially developed internal fibre, chosen for its outstanding absorbent qualities across a wide bandwidth.
The result is that the listener hears the drive unit output unsullied by unwanted colourations caused by panel vibration or internal resonances, revealing more of the detail of the musical performance.
Developed from the Slot-Loaded Distributed Port found in the Diamond 11 Series, the D300 Series’ P-EQ (Pressure Equalisation) port system is critical to the speakers’ deep and controlled bass performance.
Low bass frequencies emitted from the rear surface of the bass driver travel through a downward-firing port in the base of the speaker, with precisely curved openings to smooth airflow. These frequencies exit into the room omnidirectionally through a gap between the cabinet and the surface on which it rests (or, in the case of the D330, between cabinet and plinth), formed by four ‘feet’ attached to the speaker’s base. This reduces the pressure differential between the high pressure in the port and the low pressure in the room, thus eradicating the turbulence and audible ‘chuffing’ suffered by conventional ported systems whilst aiding bass reflex efficiency.
The result is a natural recreation of the fundamental notes of bass instruments, matching the realistic sound of the midrange and treble characteristics. It also allows the listener to position D300 Series speakers closer to a rear wall than would be possible with conventional rear-ported speakers, helping to make them less obtrusive in a room setting.