To legally install cable TV or a DSS system, there must be a ground conductor from the dish or cable tied to the earth outside of the building. This guarantees that if struck by lightening, the current will flow to ground (earth) outside of the building, never endangering someone’s life inside or damaging any equipment. Removing the ground from the DSS or cable system is not a legal or moral option. We use a grounded power cord on our powered subwoofers and amplifiers to ensure that the customer is always safe. If there is ever any internal short in the subwoofer amplifier between the power sup- ply and the chassis, the current will be shunted to ground (earth) through the power cord and the fuse will blow. The customer will never be in any danger of electric shock.
The proper way to break the ground loop in the system is to do it at the signal level. This should be done at the output of the device that is causing the ground loop. In this case it is the DSS or cable system. The best way to do this is with a ground loop isolator. A good one is avail- able from Jensen Transformers.
Jensen Transformers, Inc., 7135 Hayvenhurst Ave. Van Nuys, CA 91406
Voice: (818)
Part#
If these steps don't restore the Ten or Twelve to operation, contact your local Authorized NHT Dealer or NHT for assistance.
Satisfaction
Your satisfaction with your new NHT Ten or Twelve Subwoofer is important to us. Please note the matched products and accessories we provide for them, and your warranty, printed on the back of this manual. If you have any questions regarding your speakers' use, feel free to call NHT at
Glossary
Active: Uses electrical power.
Amplifier: An electronic device that increases the cur- rent and/or voltage of a signal, providing power to the loudspeakers (i.e. power amplifier, integrated amplifier, receiver).
Bass: The range of audio frequencies below 180Hz, characterized by low pitch.
Crossover: An electronic circuit that divides an audio signal into different frequency ranges.
Distortion: Any deviation from the original signal.
Driver: The moving part of a loudspeaker, which radiates sound energy.
Dynamics: Variations in loudness of sound.
Frequency: A rate of vibration, which corresponds to musical pitch, expressed in Hertz (Hz).
Full Range: A signal encompassing the entire audible frequency spectrum.
Hertz (Hz): A unit equal to one cycle per second, used to measure the frequency of a signal or sound.
Impedance: A measure of the total opposition to current flow in an alternating current circuit, measured in ohms. In Phase: The polarity of an audio signal when connect- ed as follows: (+) to (+) and
Integrated Amplifier: A preamplifier and amplifier built into one chassis.
Interconnect Cable: A length of shielded wire with plugs at both ends for feeding signals from one electronic device to another.
L.F.E.: "Low Frequency Effects"; The .1 channel of infor- mation recorded on most multichannel digital sound for- mats.
Load: A term used to describe the impedance that a speaker presents to an amplifier.
Main Speakers: Front L & R channel speakers, some- times referred to as satellites.
