Sunfire True Subwoofer Signature and Standard Version Overview, The Drivers, The AmpliÞer

Overview

Your SunÞre True Subwoofer EQ is designed to give you the best possible low-frequency sound quality for your Home Theater experience. It incorporates

atremendously powerful built-in ampliÞer and a pair of drivers to produce tight, ßoor-rumbling, denture-rattling bass that you can feel as well as hear.

The subwoofer is available in two ver- sions, and this manual covers both:

Signature Edition is a 13 inch cube, with an output greater than 116 dB peak SPL, 16 Hz to 100 Hz.

Standard Edition is an 11 inch cube, with an output greater than 110 dB peak SPL, 18 Hz to 100 Hz.

The subwoofer has an automatic equalization system which will tailor the subwoofer output to compensate for any room effects. It also has a manual equal- ization mode.

The subwoofer has an adjustable high cut Þlter and a choice of speaker-level or line-level inputs for easy incorporation into existing systems, or as part of a subwoofer/satellite speaker combination.

Controls for adjusting the volume, crossover frequency and phase, allow the subwoofer to be perfectly matched to any listening environment and audio components.

The Drivers

To have lots of bass requires moving lots of air. Your SunÞre Subwoofer incor- porates two drivers that can move back and forth approximately Þve times more than a normal subwoofer. This gives it a lot of air moving capacity which allows for majestic bass performance.

Two drivers share the acoustic output. Sometimes one driver appears to be moving more than the other. They both move the same amount only when op-

User's Manual

erating at the limit of their excursion and power output, or when bass requirements and music requirements demand maxi- mum output from the system. Otherwise, the power is shared between the two drivers in a way that depends on the mo- mentary amplitude and the momentary musical spectrum. It is normal for one or the other to move more or less than its mate during operation.

The AmpliÞer

The large movement range of the driv- ers creates greater air pressure inside the box than a conventional subwoofer. Therefore, the drive ampliÞer must be much more powerful than an ordinary subwoofer ampliÞer. In fact, it has to be so powerful, it is almost hard to believe.

The power ampliÞer within your SunÞre Subwoofer is capable of delivering over 2,700 watts into a 3.3 ohm resistor (the driver voice coil resistance). When the same full output is applied to the driver, however, the enormous back-electro- motive force generated as a conse- quence of its large motion and giant mag- net, causes the current ßow to be much less than if it were a 3.3 ohm resistor. It is this singular property of the driver that allows the subwoofer to be approximately ten times more efÞcient than a subwoofer this size would normally be.

A compressor circuit kicks in automati- cally if the input signal level reaches a level that would overload the driver. This maintains a ceiling on the output without clipping. If the input signal is driven even further, a ‘soft clipping’ circuit is enabled. This allows the subwoofer to put more sound into the room to satiate the power hungry user, but without distortion or damage to the subwoofer. Thus, for ex- plosive scenes in movies, this produces extremely high sound pressure levels (SPL) in your room without the drivers banging against the mechanical stops.

For more details of the subwoofer de- sign, please call us or view our website: www.sunÞre.com.

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