YORKVILLE PS12s, Owner'S Manual

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PS12s, PS15s and PS18s

Congratulations on your purchase of a Parasource Series subwoofer, the best option when adding a subwoofer 

to Yorkville Sound’s Parasource Series powered speaker enclosures. The PS12s, PS15s and PS18s are premi-

um-quality subwoofers with integrated power amplifiers.

1. Input Mode Switch

The line-level position is used when the PS12s, PS15s and PS18s are fed a signal from a processor, electronic 

crossover, the output of an un-powered mixer or the loop-through of a powered speaker cabinet. When in line-

level mode, using balanced ¼-inch (Tip, Ring, Sleeve) and/or XLR cables will reduce the unit’s sensitivity to 

hum and buzz.

For speaker level operation, connect the PS12s, PS15s and PS18s just like an ordinary speaker (in parallel 

using the loop-through jacks) along with the passive full-range loudspeakers. The speaker level position should 

be used when the PS12s, PS15s and PS18s are fed with a ¼-inch speaker cable directly from the output of an 

amplifier or a powered-mixer. You can also use a speaker level signal from the parallel connection on an un-

powered speaker cabinet.

WARNING: 

•  Do not plug in two speaker level sources to a single ES Series Powered Subwoofer!
•  Increasing the Level control while in limiting will not increase the loudness and may lead to feedback 

when the operating level is reduced.

2. The PS12s, PS15s and PS18s’ Level Control

The Level control adjusts the amount of bass added to the sound system by the Parasource subwoofer. This 

control adjusts for the relative sensitivity of the companion full-range loudspeakers and the desired system fre-

quency response. This control should be set by listening with a medium-level input signal (such that the limiter 

is not firing). 

Note: It’s not recommended to set this control at high levels since the limiter will then greatly affect the 

output level. 
Note: Setting the PS12s, PS15s and PS18s Level control at the center detent is the correct starting point 

when setting up a sound system. From there, adjustments can be made for the best sound. The detent is 

the setting that will give full power when the line input is used and the input signal is at a level of +3 dBv.