Dali Sub K-14F Black Subwoofer

RIGID CONE STRUCTURE

The rigid cone structure based on either aluminium or cone fiber eliminates the need for a dust-cap and helps ensure a piston-like behaviour of the woofer.

HIGH-YIELD AMPLIFIER

All amplifiers in DALI subwoofers have the stamina to keep a high-yield performance and the headroom to draw out that little extra when needed.

FLEXIBLE CONNECTIVITY

All DALI subwoofers are compatible with almost any amplifier, receiver or processor due to the choice of LFE or LINE inputs.

ELEGANT AND SIMPLE DESIGN

The cabinet is designed to fit perfectly to the size of the woofer, but without forgoing the inner volume that is needed to produce a powerful bass performance.

AMPLIFIER

Making sure there is enough power to move the large woofer, the 450 watts RMS integrated amplifier has the stamina to keep pushing and the headroom to draw out that little extra when needed. Constructed for lasting effect, it is powered by a switch mode power supply (SWPS) that helps keep the module at a low working temperature. For that reason there is no external heat sink on the SUB K-14 F.

Knowing that the SUB K-14 F will find itself working for hours on end, we wanted to secure the amplifier against overheating. The built in PTC ensures that even if the SUB K-14 F should become overheated, it will automatically shut down until the temperature is back at operating level and then turn back on.

The Class-D amplifier takes an analogue signal, and with an eye on performance and to keep the signal clear and undistorted, an analogue filter is applied. This filter is tuned to maximize the use of the woofer and thereby the output from the SUB K-14 F. To improve sound reproduction and to avoid excessive distortion at extreme output sound pressure levels, a power limiter has been incorporated in the amplifier signal path.

The integrated limiter works by constantly comparing the incoming audio signal to a threshold defining the maximum amplifier output power. If the incoming signal, at a certain volume setting, is about to exceed the maximum amplifier output power the level is automatically limited without introducing audible level differences or pumping artefacts. This is done to avoid clipping of the audio signal that will cause distortion and to prevent the amplifier from being damaged. The limiter is only functional at extreme sound pressure levels.

Fitted with controls for gain, cut-off frequency, and phase, the DALI SUB K-14 F will adapt to most front speaker and room acoustics. And, with a choice of LFE and LINE level inputs, it can be connected to almost any amplifier, receiver or processor.

WOOFER

The SUB K-14 F incorporates a 14” woofer with a deep black coloured aluminium cone. Chosen for its stiff, yet lightweight properties, the aluminium cone ensures a greater transient response than 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. This is also a contributing factor in ensuring a piston-like behaviour. Consequently, distortion is kept to an absolute minimum – especially in the low frequency area which is where the subwoofer operates.

The motor of the woofer is built around an ‘oversized’ ferrite magnet, and optimised for maximum flux within the voice coil gap. This carefully designed magnet system enabled the project team to reach a high B/L product to enable the SUB K-14 F to render the finer low frequency details of music, but also at a higher sound pressure level. The measured BxL value of 17 N/A is a good indication of the level of control and precision that was reached, and rarely to be found in this category at all. Numerous listening sessions has truly convinced us that this was indeed the right way to go.

The 30 mm long, 4 layer voice coil is built for long excursions. It is vented to ensure air cooling to the system and to the coil itself, keeping the temperature down, which creates a stable bass response.

Also, the pole piece is vented for maximum cooling. The venting here has another purpose though; it reduces internal compression in the motor system, which ensures free movement of the cone without any over-/underpressure affecting the performance.

Adhering to the low-loss sound design principle, the surround of the woofer is built to allow long and linear excursion. The oversized suspension is designed to allow both weak and strong transients to turn into undistorted acoustic signals.

DALI SUB K-14 F SPECS

Product series SUBWOOFERS

Frequency Range (+/-3 dB) [Hz]         29 - 160

Maximum SPL [dB]      115

Crossover Frequency [Hz]       40 - 120

Low frequency driver, Quantity            1 x 14" long stroke

Low frequency driver, Diaphragm type            Aluminium

Enclosure type Bass Reflex

Bass Reflex Tuning Frequency [Hz]    34

Max. Amplifier Power Output [RMS watt]         500

Continous IEC Power Output [RMS watt]        450

Input Impedance [ohms]          10k

Connection Input         Mono (LFE)

RCA

Stereo (low-pass filtered)

Magnetic Shielding      No

Recommended Placement      Floor

Functions         Crossover Frequency

Phase Switch

Standby (Auto Power) On/Off Switch

Volume (Gain)

Max. Power Consumption [W] 650

Dimensions With Base (HxWxD) [mm]            429 x 396 x 428

Accessories Included   Manual

Spikes M8

Weight [kg]      26.4