והמון מלחמות הוחלט סוף סוף על שינוי הכללים אשר יחיבו את היצרנים להרבה יותר נתוני ''אמת'' במוצרים
אבל עדיין נשאר פתח להתחלקות מה''אמת'' .
Executive Summary
In June of this year, the FTC revised the “Trade Regulation Rule Relating to Power Output Claims for Amplifiers Utilized in Home Entertainment Products.” Originally issued in 1974, the newly amended FTC Power Output Rating allows the consumer to more easily compare amplifiers today than the original rule did.
Required Parameters
An amplifier’s average power output must be expressed in watts-per-channel within the rated power band of 20 Hz to 20 kHz without exceeding 1.0% of total harmonic distortion plus noise (THD+N). This must be done at an impedance of 8 ohms after input signals have been continuously applied at full-rated power for not less than five minutes.
Minimum of Two Channels Driven
If the equipment is designed to amplify two or more channels simultaneously at a minimum, the left front and right front channels must both be driven.
Preconditioning
The amplifier shall be preconditioned by simultaneously operating all channels at one-eighth of the rated power output for one hour using a sinusoidal wave at a frequency of 1,000 Hz.
The disclosure of the rated power output must be clearly and conspicuously labeled “FTC Power Output Rating.”
Any other power ratings given by a manufacturer must have a type size two-thirds the size of the FTC Power Output Rating and may not be in bold print. These would also be labeled “this rating was not tested under the FTC standard.”
Other power ratings must be well-known and generally recognized by the industry. Any other disclosures that are made should neither intend nor pose the likelihood of deceiving or confusing consumers.
