Hum

Adding any component such as a sub- woofer to an existing system will often give rise to a hum which wasn’t there before. Your Þrst thought may be that the subwoofer has a problem, but this is more than likely caused by a “ground- loop” in your system.

Follow these steps to isolate the main cause of the ground-loop hum (there may even be more than one cause).

•Try to have all of your equipment on the same electrical outlet or circuit, see page 10 for more details.

•If your subwoofer is a fair distance away from your other equipment, you may use a 15 amp extension cord as long as it has a ground connection.

NOTE: Never remove the ground pin from any power cords. This is very dangerous.

•Turn off all components in your system, including the subwoofer, ampliÞers and the preampliÞer, before disconnecting or connecting cables.

•First remove every connection from the subwoofer to the rest of your system. Plug the subwoofer power cord back in and check for the hum. If it is still there, try plugging it into a different outlet in case it is picking up interference on the AC line.

•If you have followed the above guide- lines for the power connections and a hum is still present, then there is one very common problem to consider: a “ground-loop” introduced by connecting a cable TV line to a VCR or TV, which is then connected to the preamp. This can be addressed as follows:

•Disconnect all cables which come from outside the room, such as cable TV, satellite TV, or roof top antennas. Make sure that they are disconnected where they Þrst enter the room, so they are making no connection to your preampli- Þer, TV, or any other component. If the

hum is caused by the cable TV line, then you will need a “ground-loop isolator.” This is an inexpensive device Þtted in line with the coaxial cable feed.

•If the hum persists, disconnect all the source components one at a time from the back of the preampliÞer until you identify the problem.

•If you are using the subwoofer’s line level inputs and there is a excessive amount of noise or hum present, using the speaker level inputs may yield a lower background noise level.

•Ground-loop isolators are available for audio lines and video. Once you have identiÞed which components are causing a problem, you can Þt the isolators be- tween the component and the preampli- Þer.

The subwoofer won’t turn off

•The subwoofer should turn itself off after approximately Þfteen minutes with no audio signal present. If not, check there is no background hum. The subwoofer may sense hum as a small signal and stay on. See the above hints to eliminate the hum.

The subwoofer won’t turn on automatically

The subwoofer should turn on when an audio signal is applied, or 12 VDC is ap- plied to the Trigger inputs, or if the Start button is pressed. If it does not turn on, check the following:

•The subwoofer’s volume control may be turned down, or no signal is received from your preampliÞer.

•Check the input connections.

•Check the Mode switch or menu on sur- round systems to be certain that a bass signal is being sent to the subwoofer.

•Use the 12V Trigger for the most reliable on/off operation.

22 User's Manual

Page 21 Page 23
Page 22
Image 22
Sunfire 12 user manual Hum, Subwoofer won’t turn off, Subwoofer won’t turn on automatically
Page 21 Page 23

12 specifications

The Sunfire 12 is a state-of-the-art subwoofer designed to deliver unparalleled audio performance for both music lovers and home theater enthusiasts. Known for its deep, powerful bass response, the Sunfire 12 has become a popular choice among audio engineers and consumers alike. This subwoofer embodies a blend of innovative technology and practical design, making it a standout option in the competitive subwoofer market.

One of the hallmark features of the Sunfire 12 is its impressive 12-inch high-excursion driver. This driver is engineered to move more air than typical subwoofers, resulting in profound low-frequency output. The driver is complemented by a unique Dual Voice Coil design, which allows for greater control and improved linearity during operation, ensuring that dynamic audio passages are reproduced with precision.

The subwoofer also incorporates Sunfire’s patented "Tracking Downconverter" technology. This advanced power supply design ensures that the Sunfire 12 can deliver consistent power output, even during the most demanding audio peaks. The result is a dramatic increase in efficiency, which translates to powerful bass without distortion, even at high volumes.

Another notable characteristic of the Sunfire 12 is its compact size. While it delivers deep, resonant bass, the subwoofer's enclosure is significantly smaller than traditional models. This compact design allows for flexible placement in a variety of home environments, making it an ideal choice for those with limited space. The elegant aesthetic of the enclosure ensures that it can blend seamlessly into any room décor.

The Sunfire 12 also features a sophisticated set of adjustable controls. These allow users to fine-tune the subwoofer’s performance to match the acoustics of their space, ensuring optimal sound quality regardless of the room’s dimensions. The built-in crossover and phase control further enhance the ability to integrate the subwoofer with existing sound systems, allowing for a customized listening experience.

With its robust construction and cutting-edge technologies, the Sunfire 12 sets a high standard for compact subwoofers. Whether for music playback or home theater applications, the Sunfire 12 delivers an immersive audio experience, making it a top choice for discerning audiophiles seeking powerful bass without compromise.
Top Page Image Contents