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DESIGN FEATURES 

Hand-crafted in the U.S.A.  with mil-spec glass epoxy circuit boards, low-
loss connections, gold-plated input connectors, and metal film resistors. 

Darlington High Current Output Topology - Soundstream's 
"overbuilding" of the output section incorporates Darlington output devices 
sandwiched between the circuit board and the heatsink in a design called 
Chassisink™ to ensure cool, efficient amplifier operation. 

    

Mixed Mono Capable so you can simultaneously drive a stereo and mono 
load (satellites and subwoofer).   

2 Ohm Drive Ability - The satellite channels of the USA•305 amplifier are 
designed to drive loads down to 2 Ohms stereo (5 channel mode) and 4 
Ohms bridged (3 channel mode).  The subwoofer channel of the USA•305 
is designed to drive loads down to 2 Ohms. 

           

Built-in Staggered Crossover - Built in 2-way electronic crossover is 
designed to send either high or low pass information to the amplifier. 

Bass EQ - Adjustable bass equalization circuit allows you to boost bass by 
as much as +9 dB at 45 Hz.  A built-in subsonic filter helps to protect 
speakers. 

Drive Delay™ Muted Turn-on/off Circuit - A unique circuit which 
completely eliminates any amplifier-related turn-on/off noises. 

Flexible Input Sensitivity - Accepts input voltages from 100 mV to 2.5 V, 
which permits maximum output from amplifier with virtually any source 
unit. 

Differential Balanced Input Topology for added immunity to ground 
loops caused by component and vehicle electrical system interaction. 

 

 

Power 

4 ohms

 

Power 

2 ohms

 

Bridged Power 

4 ohms

 

USA•305

 

35w x 4 + 

100W X 1

 

60w x 4 +  

160w x 1

 

120w x 2 

15 

USA•305 

System Configuration #2: 
 

One pair of stereo inputs 

Four channels driving satellites in high pass 

Internal inputs to channels 3 & 4 

Subwoofer channel driving two subwoofers in low pass 

Internal inputs to the subwoofer channel 

Internal crossovers used 

Summary of Contents for USA 305

Page 1: ...Road Folsom California 95630 USA ph 916 351 1288 fax 916 351 0414 ver 1 17 96a two 4 ohm woofers in parallel 2 ohms two 4 ohm woofers in series 8 ohms PARALLEL SERIES WIRING DIAGRAMS 1 USA 305 Power Amplifier OWNERS MANUAL AND INSTALLATION GUIDE ...

Page 2: ...______________________________________ Installation Shop ___________________________________________ Installation Date ____________________________________________ CAUTION Prolonged listening at high levels may result in hearing loss Even though your new Soundstream amplifier sounds better than anything you ve ever heard exercise caution to prevent hearing damage 19 SPECIFICATIONS POWER OUTPUT CRO...

Page 3: ... No sound and LED is not lit no power or ground at amp no remote turn on signal blown fuse near battery blown amp power supply fuse Repeatedly blown amp fuse fre quent activation of Thermal Pro tection Circuit check speaker configuration impedance may be less than 2 ohms stereo or 4 ohms mono speaker or leads may be shorted verify adequate amplifier ventila tion 3 TABLE OF CONTENTS USA 305 Diagram...

Page 4: ...17 System Configuration 4 One pair of stereo inputs Two bridged channels of high pass stereo operation driving satellites Subwoofer channel driving one subwoofer Bass EQ bypassed Internal crossovers used USA 305 ...

Page 5: ...ker Output Connections Channels 3 4 13 Input Level Variable from 100mV to 2 5V Channels 3 4 14 Inputs Right and left channel inputs only right channel input used in Mono mode Channels 3 4 15 underside Main Fuse Main power supply fuse Replace only with same fuse value 16 underside Xover S I P Crossover frequency setting for subwoofer channel 17 underside Bass EQ Switch On Off switch for bass equali...

Page 6: ...y electronic crossover is designed to send either high or low pass information to the amplifier Bass EQ Adjustable bass equalization circuit allows you to boost bass by as much as 9 dB at 45 Hz A built in subsonic filter helps to protect speakers Drive Delay Muted Turn on off Circuit A unique circuit which completely eliminates any amplifier related turn on off noises Flexible Input Sensitivity Ac...

Page 7: ... the switches on the bottom are set to the correct positions LOW PASS The low pass crossover is used for sending only low frequency information to subwoofers The low pass crossover is always activated If you wish to bypass the internal low pass filter in order to use your own external crossover an 800 Hz S I P has been included with your amplifier Using an 800 Hz crossover point will effectively t...

Page 8: ...amplifier In the ideal situation all components in the audio system reach maximum undistorted output at the same time The reason is because an amplifier will only make what comes into it bigger So if you send it a distorted signal from the head unit it is going to amplify distorted information The same thing holds true if an outboard processor or crossover begins to distort before you have maximum...

Page 9: ...es of the battery c Then connect the fuse or circuit breaker to the battery Leave the circuit breaker off or the fuse out until everything is bolted down d Secure the ground cable to a solid chassis ground on the vehicle It may be necessary to sand paint down to raw metal for a good connection e Double check each and every connection f Re connect the fuse or circuit breaker 5 POWER UP Power up the...

Page 10: ...ternally with automotive type fuses The fuses are accessible via a plastic plug on the bottom of the amplifier Never replace the fuses with a higher value than what is supplied This may result in amplifier damage and will void the warranty Continued on page 11 up to 10 up to 20 USA 305 Soundstream Power80 or Power100 Soundstream Power80 8 ga INSTALLATION STEP 3 Model Amplifier Fuses Battery Fuse C...

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