Protection Circuitry; Amplifiers And 2-Ohm Operation; Electrical Wiring - Boss Audio Systems AVA-250 Owner's Manual

Ill A FEW WORDS ABOUT PROTECTION CIRCUITRY III
The protection circuitry will disable the amplifier if it senses an input overload, speaker short circuit
or extreme high temperature conditions. When the protection circuit Is in operation the LED
Indicator on the panel of the unit will light Indicating that the amplifier has gone Into a self
preservation mode. At this time please check your system to see what Is causing the protection
circuit to fire. The amplifier can be reset by turning the remote power off and then on again. If the
system shutdown because of a thermal overload condition, allow the amplifier to cool down before
restarting. If the amplifier shutdown because of an input overload or speaker short circuit please
be sure to correct these conditions before restarting the amplifier.
Ill AMPLIFIERS & 2-OHM OPERATION lll
AVA-250/450/550/650/700/750/800 All BOSS amplifiers were designed to operate efficiently at
loads down to 2 ohms. What this means Is that you can do an installation of FOUR-8 ohm
speakers per channel using parallel wiring or TWO-8 ohm speakers per channel in parallel.
Increasing the number of woofers per channel at low frequencies up to 100 Hz produces
an acoustic coupling effect. This acoustic coupling increases your power output by 3 dB per
speaker. This might not sound like a lot but to produce an additional 3 dB of music power should
be the equivalent of adding an additional 10 watts to each speakeri
When operating at 2 ohms, the amplifiers increase their power output by approximately 50
percent. The current draw of the amplifiers will also increase by about the same amount. Be sure
that you have enough current to run the amplifiers Into a 2 ohm load otherwise distorted music will
be reproduced.
PLEASE NOTE:
The gain control of any car audio amplifier should not be mistaken for a volume control. It is a
sophisticated device designed to match the output level of your source unit to the input level of the
amplifier. Do not adjust the level to maximum unless your input level requires it. Not following this
instruction will result in an input overload to the amplifier and high levels of distorted musical
reproduction,
For speaker level Input. Simply wire the speaker output leads from your source to the Input of the
amplifier. Make sure to wire the positive leads to the positive Inputs and the negative leads to the
negative inputs.
Ill ELECTRICAL WIRING III
All BOSS amplifiers are equipped with easy top access screw terminals. These terminals are 14 K
Gold Plated to insure excellent electrical contact and to resist corrosion. See FIGURE I for
electrical Installation of all amplifiers. We suggest using at least 8 gauge wire for the power and
ground connections. Wire the amplifier directly to the car battery. For the ground connection use
the shortest possible wire to a good chassis ground point. Wire the Remote connection to auto
start lead of your equalizer or power antenna.
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