DALI sub E-9 F WhitePaper
Introduction DALI SUB E-9 F With the rising interest in high quality compact speakers the demand for a potent yet compact subwoofer is growing. The DALI SUB E-9 F was developed precisely to fill this demand. Build around a compact cabinet, a powerful amplifier and a stiff yet lightweight aluminum woofer. Developing a DALI subwoofer involves the same meticulous attention to detail as you will find in the development of a DALI speaker.
ACOUSTIC BACKGROUND Frequency Response 120.0 dBSPL 110.0 100.0 90.0 80.0 70.0 LFE Maximum cut-off frequency Medium cut-off frequency Minimum cut-off frequency SUB E-9 F frequency response at different low-pass values. Unlike many subwoofers in the market the DALI SUB E-9 F has been engineered to perform equally well on both music and movies. It is important to us that a subwoofer is capable of rendering a performance true to the input signal. Therefore a DALI subwoofer is everything but a ‘boombox’.
Frequency Response 100.0 dBSPL 90.0 80.0 70.0 60.0 50.0 DALI ZENSOR 1 and DALI E-9 F DALI E-9 F DALI ZENSOR 1 The DALI SUB E-9 F clearly has its heart set on high fidelity. Properly set up it has a superior ability to integrate with the front speakers providing more than just an extension of the low frequency range.
CABINET Any risk of port noise derived from the down-firing bass vent itself is seriously reduced by its convex tapered design. Apart from the shape of the flares the vent has also undergone extensive testing, measuring and listening when it comes to dimensions and placement, in order to optimize interaction with the cabinet and woofer. Built on almost 30 years of knowledge in acoustics and cabinets, the solid MDF cabinet abides the tough DALI specifications.
Woofer The DALI SUB E-9 F incorporates an aluminium cone woofer. This stiff, yet lightweight, material was chosen to ensure a greater transient response as you would normally expect from a subwoofer in this category. Very much in line with DALI’s philosophy in building speakers, the ability to start and stop very quickly enables easy integration with the front speakers. Designed to be a closed cone you will find no dust cap. Instead it is an integrated part of the cone itself.
The woofer for the SUB E-9 F was developed from scratch by DALI’s acoustic engineers. The voice coil is 26.5 mm long, and built for long excursions. It is vented to ensure aircooling to the system, and the coil itself. Venting this 4-layer voice coil keeps the temperature down, and the benefit is a stable impedance response. Also the pole piece is vented for maximum cooling. Here the venting has another purpose too; it reduces internal compression in the motor system.
AMPLIFIER The high-efficiency amplifier needs no external heat sink. The integrated 170 Watt RMS Class D amplifier is a highly linear construction. The DALI SUB E-9 F will follow and render the required signal with an absolute minimum of bias. Designed not only for continuous power, but also for peak power, this subwoofer is able to deliver 220 Watt Peak Power. This is very relevant when it comes to both movie and music signals.
Application Placing a subwoofer is a very large part of creating the perfect audio reproduction. DALI recommends placing the SUB E-9 F in a corner or if that is not possible alongside a wall. This will maximise the bass output and the distribution around the room. The compact size of the SUB E-9 F makes placing it correctly much easier than many larger subwoofers.
TECHNICAL SPECIFICATIONS DALI A/S www.dali-speakers.
