Samson D1800 User Manual

A speaker reproduces sound by converting electrical signal into physical vibration. 

This physical vibration, in turn, pushes air to create sound waves. When setting up your 

speaker system, the goal is to have all speakers moving in phase, with the in and out 

movement of the speakers synchronized. 

This produces an even sound across all 

audible frequencies. If the subwoofer is 

out of phase with the full range front of 

house speakers, you may notice decreased 

bass response, or even bass frequency 

cancellation where satellite and subwoofer 

frequency responses overlap. Many times 

this phenomenon is very subtle, but it can 

produce the effect of “holes” in the music, 

and diminished bass frequencies.

Ideally, your Auro D1800 subwoofer should be positioned on the same plane as your 

satellite speakers. In reality, we know this is difficult, as there are restrictions when 

setting up a PA system due to space limitations, speaker stand configuration, or even 

speaker cabinet shape. To compensate for these obstacles, the Auro D1800 features 

a Phase switch, which allows you to reverse the polarity of the subwoofer relative to 

the source signal. This enables you to put the D1800 in phase with the rest of your PA 

system, or 180° out of phase. 

To determine if the audio produced by your D1800 is in phase with the rest of your PA 

system, play an audio track containing a lot of bass frequencies through your speaker 

system. Stand at a good listening distance, where you can clearly hear the audio from 

the subwoofer(s) and mains speaker(s), and listen until you believe you have a good 

gauge of the level of bass frequencies. Press the Phase switch on the D1800 to reverse 

the phase by 180°, and move back to your original listening position (if possible, have 

someone else press the Phase switch so that you can stand in the exact same loca-

tion). Compare the overall level of the bass frequencies between the two settings. The 

correct setting will result in more bass frequencies. If the situation allows, you can fine-

tune the phase of your D1800 to your satellite speakers by moving the relative position 

of the subwoofer closer or further away from the listening position. 

0°

90°

180°

270°

360°

Phase SW = NORMAL

Phase SW = INVERT

Auro D1800

Owner's Manual