KNAC is an internet based heavy metal music

Heavy metal music

Heavy metal is a genre of rock music that developed in the late 1960s and early 1970s, largely in the Midlands of the United Kingdom and the United States...

 radio

Radio

Radio is the transmission of signals through free space by modulation of electromagnetic waves with frequencies below those of visible light. Electromagnetic radiation travels by means of oscillating electromagnetic fields that pass through the air and the vacuum of space...

 station. It was previously a Los Angeles, California

Los Angeles, California

Los Angeles , with a population at the 2010 United States Census of 3,792,621, is the most populous city in California, USA and the second most populous in the United States, after New York City. It has an area of , and is located in Southern California...

 area FM

FM broadcasting

FM broadcasting is a broadcasting technology pioneered by Edwin Howard Armstrong which uses frequency modulation to provide high-fidelity sound over broadcast radio. The term "FM band" describes the "frequency band in which FM is used for broadcasting"...

 radio station

Radio station

Radio broadcasting is a one-way wireless transmission over radio waves intended to reach a wide audience. Stations can be linked in radio networks to broadcast a common radio format, either in broadcast syndication or simulcast or both...

.
The original KNAC was an American radio station based in Long Beach, California

Long Beach, California

Long Beach is a city situated in Los Angeles County in Southern California, on the Pacific coast of the United States. The city is the 36th-largest city in the nation and the seventh-largest in California. As of 2010, its population was 462,257...

, that served Los Angeles County and Orange County, California

Orange County, California

Orange County is a county in the U.S. state of California. Its county seat is Santa Ana. As of the 2010 census, its population was 3,010,232, up from 2,846,293 at the 2000 census, making it the third most populous county in California, behind Los Angeles County and San Diego County...

, by broadcasting

Broadcasting

Broadcasting is the distribution of audio and video content to a dispersed audience via any audio visual medium. Receiving parties may include the general public or a relatively large subset of thereof...

 in FM band at a center frequency

Frequency

Frequency is the number of occurrences of a repeating event per unit time. It is also referred to as temporal frequency.The period is the duration of one cycle in a repeating event, so the period is the reciprocal of the frequency...

 of 105.5 MHz. KNAC-FM had a variety of different formats

Radio format

A radio format or programming format not to be confused with broadcast programming describes the overall content broadcast on a radio station. Radio formats are frequently employed as a marketing tool, and constantly evolve...

. With a relatively weak radio signal and a small area, KNAC never appeared in the Arbitron radio ratings

Arbitron

Arbitron is a consumer research company in the United States that collects listener data on radio audiences. It was founded as American Research Bureau by Jim Seiler in 1949 and became national by merging with L.A. based Coffin, Cooper and Clay in the early 1950s...

. Outside the Los Angeles area, the station gained a huge following from Heavy Metal fans across the United States (via marketing and selling of t-shirts, stickers, compact disc

Compact Disc

The Compact Disc is an optical disc used to store digital data. It was originally developed to store and playback sound recordings exclusively, but later expanded to encompass data storage , write-once audio and data storage , rewritable media , Video Compact Discs , Super Video Compact Discs ,...

s, etc., with ads in Heavy Metal fan magazine

Fan magazine

A fan magazine is a commercially written and published magazine intended for the amusement of fans of the popular culture subject matter which it covers. It is distinguished from a scholarly or literary magazine on the one hand, by the target audience of its contents, and from a fanzine on the...

s).