Hidden Subwoofers

Designed to be fitted into a cavity wall with 16″ spaced studs (on centre), the ALF120 is mounted using felt pads which not only hold it securely in place, but also mechanically decouple the cabinet from the structure of the property, allowing all sound energy to be effortlessly ported directly into the room and not into the rest of the structure.

It is also possible to install into a ceiling void or into furniture if this helps to further remove the slotted vent from the eye-line of the listener.

ALF120 Installation Guide

Being a passive subwoofer, the ALF120 requires external amplification, however due to the Distributed Transmission Line design using 4″ drivers, it requires DSP to maximise performance and ensure it continues to perform for a lifetime.

Either requiring a dedicated DSP amplifier or a system processor and ‘dumb’ amplifier combination, the requirement is for 3 bands of parametric EQ, 48dB/Octave bandpass filtering and absolute voltage limiting. For information on a suitable amplifier or processor, please contact your distributor.

Note: 

Failure to use adequate DSP protection may result in warranty becoming void.

ALF120 Datasheet and DSP Settings

ALF80 can be mounted directly to stud frame using the supplied metal mounting L-brackets.

Port tube can be relocated to one of 3 port-opening positions and can have it’s length adjusted to perfectly match the depth of the ceiling void (maximum adjustment 100mm).

Note:

Port tube can be adjusted, but should never be replaced, bent, extended or blocked. Doing so will impact the performance of the subwoofer.

ALF80 Installation Guide

Being a passive unit, the ALF80 requires external amplification. Given that both protection and filtering are both built in to the subwoofer itself, the unit can be powered by a 150W amplifier delivering full-bandwidth content.

The ALF80 can be powered by its own dedicated amplifier channel, alternatively it may be wired in parallel to a single Amina VPT loudspeaker panel.

Note:

Please take care to match total impedance load to the amplifier when wiring subwoofers and speakers in parallel. It is not wise to wire two subwoofers in parallel to each other, however it is possible to wire a 4 Ohm subwoofer in parallel to a 4 Ohm loudspeaker panel without affecting overall load that the amplifier will see. For example, the ALF80 can be wired in parallel to a Mobius5 and still appear as a 4 Ohm total load.

ALF40 can be mounted directly to stud frame using the supplied metal mounting L-brackets.

Port tube can be relocated to one of 2 port-opening positions and can have it’s length adjusted to perfectly match the depth of the ceiling void (maximum adjustment 80mm).

Note:

Port tube can be adjusted, but should never be replaced, bent, extended or blocked. Doing so will impact the performance of the subwoofer.

ALF40 Installation Guide

Being a passive unit, the ALF40 requires external amplification. Given that both protection and filtering are both built in to the subwoofer itself, the unit can be powered by a 60W amplifier delivering full-bandwidth content.

The ALF40 can be powered by its own dedicated amplifier channel, alternatively it may be wired in parallel to a single Amina VPT loudspeaker panel.

Note:

Please take care to match total impedance load to the amplifier when wiring subwoofers and speakers in parallel. It is not wise to wire two subwoofers in parallel to each other, however it is possible to wire an 8 Ohm subwoofer in parallel to an 8 Ohm loudspeaker panel without affecting overall load that the amplifier will see. For example, the ALF40 can be wired in parallel to an iQ3 and still appear as an 8 Ohm total load.