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PARALLEL/SERIES WIRING DIAGRAMS
USA•204
two 4 ohm woofers
two 4 ohm woofers
&
in parallel = 2 ohms
in series = 8 ohms
USA•364
Power Amplifiers
OWNERS MANUAL AND
SOUNDSTREAM TECHNOLOGIES
INSTALLATION GUIDE
120 Blue Ravine Road
Folsom
California 95630 USA
ph 916.351.1288
fax 916.351.0414
ver. 1.17.96a
28
1
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Summary of Contents for Soundstream USA-204
- Page 1 4 ohm woofers two 4 ohm woofers & in parallel = 2 ohms in series = 8 ohms USA•364 Power Amplifiers OWNERS MANUAL AND SOUNDSTREAM TECHNOLOGIES INSTALLATION GUIDE 120 Blue Ravine Road Folsom California 95630 USA ph 916.351.1288 fax 916.351.0414 ver. 1.17.96a...
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Page 2: Features
CONGRATULATIONS! You now own a Soundstream Amplifier, the result of a unique design and engineering philosophy. To maximize the performance of your system, we recommend that you thoroughly acquaint yourself with its capabilities and features. Please retain this manual and your sales and installation receipts for future reference. -
Page 3: Table Of Contents
PROTECTION CIRCUITRY Your USA amplifier is protected against both overheating and short circuits by means of the following circuits: Main power supply fuses. Speaker output circuit breakers. A fail-safe thermal protection circuit activating at 95°C. NOTE: If you experience blown main power supply fuses, DO NOT increase values beyond the original values! Doing so will void your warranty and may damage your amplifier. - Page 4 USA•364 USA•204...
- Page 5 USA•364 System Configuration #4: One pair of stereo inputs Two bridged channels of low pass operation driving subwoofers Bass EQ engaged High pass RCA output to an external amplifier driving satellites Internal crossovers used Key to Callouts 1. + 12V - Connected to fuse or circuit breaker, then battery’s positive post. Ground - Main ground connection.
- Page 6 USA•364 USA•364...
- Page 7 USA•364 System Configuration #3: Two pairs of stereo inputs Four channels driving satellites in high pass Low pass RCA outputs to an external amplifier driving a subwoofer Internal crossovers used HINT: from the USA•364 plus 12 dB/Oct 75 Hz low pass internal crossover on the USA•180 sums to 24 dB/Oct 75 Hz low pass filter! 10.
- Page 8 Mixed Mono Capable so you can simultaneously drive a stereo and mono load (satellites and subwoofer). 2 Ohm Drive Ability - Soundstream USA amplifiers are designed to drive loads down to 2 Ohms stereo (4 channel mode) and 4 Ohms bridged.
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Page 9: Crossover Modes
Internal crossovers used INSTALLATION STEP 1 SETTING THE CROSSOVER MODES The Soundstream USA•204 & 364 incorporate a defeatable electronic crossover for each pair of channels. The USA•364 amplifier includes crossover outputs that can drive a complete system without need of an outboard electronic crossover. -
Page 10: Crossover Adjustments
CROSSOVER ADJUSTMENTS In most car audio installations, there is a tendency for a “midbass boom.” Because of their interior dimensions, most cars will resonate or ring at these midbass frequencies. If we design the system so there is less musical information in this region, the final response is very smooth and natural sounding. -
Page 11: Selecting Input Modes
INSTALLATION STEP 2 SELECTING INPUT MODES On Soundstream amplifiers, a pair of channels may be bridged for mono operation. To do so, simply put the stereo switch into the “mono” position and follow the mono wiring (Right Positive goes to speaker’s positive; Left Negative goes to speaker negative). - Page 12 CIRCUIT BREAKERS/FUSES EXTERNAL Like all audio components, the Soundstream amplifiers must be fused near the battery. A fuse or circuit breaker must be located within 18” of the battery. This will prevent a fire in the event of a shorted cable. See the chart below to determine the value of your battery fuse/circuit breaker.
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Page 13: Wiring & Wiring Diagram
SIGNAL CABLE To guarantee optimum performance, use a high-quality cable that will be easy to install and has minimal signal loss such as Soundstream’s DL1 or SL1. SPEAKER CABLE Use a high quality, flexible, multi-strand cable for best performance and WIRING DIAGRAM USA•364 wiring shown... -
Page 14: Installation And Mounting
NOTE: Even though the S/N ratio with low output sources is better with the Soundstream amplifiers than others, your best combination of output level and Signal to Noise ratio will be achieved when the input levels are set between 500 mV and 2.5 V...