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 first 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, pro- vided that the total current draw does not exceed the current safety rating of the outlet or circuit.

•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.

•Turn off all components in your system, including the subwoofer, amplifiers and the processor, 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 first enter the room, so they are making no connection to your processor, 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 fitted 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 processor until you iden- tify the problem.

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

•Ground-loop isolators are available for audio lines and video. Once you have identified which components are causing a problem, you can fit the isolators be- tween the component and the preamp.

No auto turn off

•The subwoofer should turn itself off after approximately fifteen 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.

No auto turn on

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

•Check the input connections.

•Check on surround systems to be cer- tain that a bass signal is being sent to the subwoofer.

18 User's Manual

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Sunfire HRS-8, HRS-10, HRS-12 user manual Hum, No auto turn off, No auto turn on
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HRS-12, HRS-10, HRS-8 specifications

The Sunfire HRS series offers a range of high-performance subwoofers that cater to audiophiles and home theater enthusiasts alike. Among the notable models in this series are the HRS-12, HRS-10, and HRS-8, each delivering exceptional sound quality and powerful bass response.

The HRS-12 is the flagship model, featuring a 12-inch driver and a powerful 2000-watt peak amplifier. It utilizes Sunfire's patented High Pressure Drive technology, which allows for a remarkable output-to-size ratio. This means that despite its compact design, the HRS-12 can reproduce deep, driving bass that fills any room. The subwoofer also incorporates a unique dual opposing driver configuration, which minimizes distortion and enhances sound clarity by canceling out unwanted vibrations.

Next in the lineup, the HRS-10 features a slightly smaller 10-inch driver, but it still maintains impressive performance. With a 1200-watt peak amplifier, the HRS-10 is capable of producing rich, deep bass that complements movie action sequences or music performances. This model also benefits from the same High Pressure Drive technology, ensuring that users experience minimal distortion, even at high volume levels.

The HRS-8, with its 8-inch driver, is designed for those who desire quality sound in a more compact form factor. Despite its smaller size, this subwoofer is powered by a 600-watt peak amplifier and delivers surprisingly deep bass. Ideal for smaller rooms or setups that need discreet audio solutions, the HRS-8 still excels in performance, making it a favorite for apartment dwellers or those with limited space.

All models in the Sunfire HRS series incorporate advanced features such as adjustable phase control, variable crossover frequencies, and a front-firing design that allows for flexible placement options. This means users can fine-tune their listening experience according to their room's acoustics and personal preferences.

In summary, the Sunfire HRS-12, HRS-10, and HRS-8 subwoofers exemplify the brand’s commitment to delivering powerful, high-quality bass in a variety of formats to suit different needs. Whether in a home theater setup or a music listening environment, these subwoofers ensure a deep and immersive experience, making them standout choices in the marketplace. Their combination of advanced technology, thoughtful design, and exceptional performance solidifies their reputation among audio enthusiasts.
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