Radio Shack 85 owner manual Features, Automatic Thermal Protection

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FEATURES

Your Optimus 85 × 4 High Power 4- Channel Trunk Mount Amplifier is de- signed to produce a total of 340 watts to give added punch and power to your vehicle’s existing stereo sys- tem.

The amplifier produces up to 85 watts per channel of clean, powerful sound at all audio frequencies with minimum distortion. You can adjust the crossover frequency for both channels 3 and 4 when using only two speakers and a subwoofer, so you can emphasize the bass sounds but not lose the other sounds or pow- er. You can connect your autosound system’s line-level or speaker level outputs to the amplifier.

Its features include:

14k Gold-Plated Noise-Isolated

Line-Level Input Jacks - let you connect low-level(pre-amplifier) sig- nal inputs to match your autosound system’s output for the best high-fi- delity performance.

14k Gold-Plated Speaker Termi-

nals - designed for low impedance, high conductivity, and minimum cor- rosion to provide the highest signal transfer and lowest sound distortion.

Input Level Controls - let you adjust

the level of the audio signals that en- ter the amplifier.

Automatic Power Switching - auto-

matically turns on/off the amplifier when you turn on/off your autosound system.

Bridging Capability - lets you com- bine the amplifier’s four 85-watt channels so you can use the system with only two channels that produce a total of 170 watts from each chan- nel.

Crossover Frequency Circuit - lets

you adjust the crossover frequency from 45-400 Hz for both channels three and four when you use only two speakers.

Crossover Frequency ON/OFF

Switch - lets you set the amplifier to drive a connected subwoofer.

Automatic Thermal Protection

System (ATPS) - automatically low- ers the amplifier’s output power when the amplifier’s internal temper- ature reaches 202× F then increases the output power when the amplifier cools down.

© 1995 Tandy Corporation.

All Rights Reserved.

Optimus and Radio Shack are registered trademarks used by Tandy Corporation.

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Contents 85 × 4 High Power 4-Channel Trunk Mount Amplifier Features Automatic Thermal ProtectionMute Turn On Circuit eliminates Contents Choosing a Mounting Location Before YOU Begin the InstallationPreparation Connecting Ground and PRIMARY/SWITCHED Power Illus please add a dwg that illustrates step Connecting to Your Autosound System Low Level Input ConnectionsFm Page 9 Tuesday, July 13, 1999 1007 AM Fm Page 10 Tuesday, July 13, 1999 1007 AM High-Level Input Connections Floating Ground Connection Common Fm Page 13 Tuesday, July 13, 1999 1007 AM Connecting the Speakers Preparing the Speaker WiresConnecting Four Speakers Connecting Two Speakers Unbridged Connection Connecting Two Speakers Bridged Connection Fm Page 18 Tuesday, July 13, 1999 1007 AM Connecting Two Unbridged Speakers and One Bridged Subwoofer Testing the Connections Mounting the Amplifier Fm Page 22 Tuesday, July 13, 1999 1007 AM Turning on the Amplifier Setting the Level ControlOperation Over Freq Control Using the Frequency CrossoverOver Freq On/Off Switch Maintenance Replacing a Blade-Type Fuse Replacing the FusesReplacing the Tube-Type Fuse Specifications Radio Shack