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Features
Controls
Connections

Features

Overview: The SA1 amplifier is designed to be used with the Boston Acoustics line of installed subwoofers. One SA1 amplifier can power up to two of the same model subwoofer.

Variable Crossover: The amplifier has a built-in variable crossover that makes it easy to achieve a seamless blend with the main speakers, while the 24dB/octave low-pass filter prevents the subwoofer from being easily localized by the ear, increasing placement flexibility. The crossover point may be adjusted from 40-160 Hz.

Controls

Front Panel Controls:

• Phase Switch: switches the polarity of the two speaker outputs; the correct setting is that which yields the fullest bass
• Low-pass Knob: allows you to adjust the low-pass crossover point from 40-160 Hz
• Volume Knob: allows you to adjust the volume level up or down until the bass level of your subwoofer matches the bass level of your speakers

Rear Panel Controls:

• EQ Mode Switch: allows you to select one of the following EQ modes, depending where your subwoofer is located: Wall or Floor
• 12-volt Trigger Switch: allows you to choose one of the following settings:
  • On: amp is on whenever the front panel switch is in the On position
  • 12V: amp is in standby mode whenever the front panel switch is in the On position. The SA1 turns on when a 12-volt power supply triggers it.
    • Note: Be sure to use a power supply that is rated as, "9 to 14 volts DC @ 1.5mA max. 1/8" diameter female plug with tip positive."
  • Music: amp is in standby mode whenever the front panel switch is in the On position. The SA1 turns on when an audio input signal triggers it.

Connections

Rear Panel Connections:

• Line In: left and right RCA audio jacks; use this configuration if you wish to set the subwoofer crossover point using the SA1's low-pass control knob on the front panel or are using separate components, such as stereo preamplifier.
• LFE/Xover Bypass: single RCA audio jack; in this configuration, the SA1's internal low-pass filter and front panel low-pass control knob will be bypassed
• Speaker A/Speaker B: gold-plated binding posts; the binding posts are not 5-way because a plastic collar prevents their use with spade lugs