Best of both worlds
Huge sound, deep, fast, musical, compact, yet powerful, just some of the words you'll utter once you've heard the Reference 150. The Reference 150 Active Sub Bass System has all the input and output connectivity you could ever wish for. A 150 watt amplifier powering a 250mm long throw driver, makes the Reference 150 a truly awesome performer for its size. Its beautiful cabinet finish and muscular composure, further add to its asthetic appeal. This sub has the output of larger models but in a gorgeous compact cabinet.... the best of both worlds.

Crossover
The "Reference 150" has the ultimate in sophisticated crossover circuits. A Digitally Accurate MicroProcessor controlled crossover circuit (DAMP), incorporates a digital display so that the upper response limit can be set in musically accurate variable increments between 30hz and 120hz. A "straight-through" LFE bypass facility is activated at one end of the controls travel which allows the input signal to bypass the filter circuit. The LFE bypass is used where an already filtered signal is offered to the low level input sockets. An example of this would be a sub output from a dedicated control pre-amplifier such as found in a Home Cinema system.

Controls
There are separate gain controls for high and low level inputs, a "straight-through" LFE bypass and an audibly transparent, "Automatic Speaker Protection" (A.S.P.) circuit which monitors the output stages for clipping and limits the cone movement if the amplifier is being over-driven. Professional Neutrik Speakon connectors are standard for the "Reference 150's" stereo high level input and output. Gold-plated pins inside and an approved touch proof design to cater for potentially high voltages that can be connected to it complete the high level input socketry. The "Reference 150" also offers a balanced low-level XLR input and output for use with professional mixing desks and suitably equipped domestic systems. Additionally, gold plated RCA connectors and 3.5mm stereo jacks for PC's and laptops are offered to cater for multipul input and output configurations.

There is a relay in the signal output of the amplifier which waits for 2-3 seconds before it connects the loudspeaker. This allows the power supply to settle and prevents a loud thump that would occur without it. When switched off, the relay instantly disconnects the loudspeaker and allows the power supply and output transistors to discharge without noise. The amplifier panel is constructed from high grade 4mm thick aluminium sheet and has a 0.46ºC/W Heat-sink rating. Additionally the Bi-Polar transistors are bolted to this plate to further reduce the required heat build-up as output rises. This combination enables the amplifier, even under continuous high loads to run amazingly cool during operation. As an added security measure a 90ºC thermal trip is added to the platform to prevent heat stress to components when over driven.