Rotel RSX-1057 Brochure

RSX-1057

Surround Sound Receiver

An important note about power specifications:

When is 75 watts really 75 watts? In the days of two-chan-

nel audio, it was pretty easy to determine the power of an

amplifier because everyone had to play by the same rules. All

manufacturers were forced to use the following criteria to de-

termine power as mandated by the FTC. All of the amplifier’s

channels must be driven at 8 ohms with a frequency response

of 20 Hz to 20 kHz. The FTC does not have a rule enforcing

the measurement of multi-channel amplifiers.

This test produced a result called RMS (Root Mean Square),

or the continuous average output of the amplifier. This is still

the only proper way to test an amplifier’s capabilities. Today’s

multi-channel receivers and power amplifiers are often having

their power rated (watts per channel) by driving one channel at

1 kHz. This formula will never tell you how that amplifier will

perform under a real-world load because the sound humans

can hear is located across the entire bandwidth of 20 Hz to

20 kHz.

Rotel is an audiophile company and is proud to display the

actual power rating of all channels driven at 8 ohms with a fre-

quency response of 20 Hz to 20 kHz. This is the only way to

show what actual power will be available during real-world use.

Be careful of what appears to be exceptional power ratings for

a given price range and read the specifications carefully. For

more information on amplifier design and power supply per for-

mance, read pages four and five in our 2005 - 2006 Product

Catalog or go to www.rotel.com to download a copy.