PSB 6919217 Owner's Manual - R’

These two factors causing distortion in bass drivers are practically 

eliminated by the combination of an aluminum shorting ring within the 

magnet structure, the aluminum phase plug on the pole piece, and a 

shorted copper turn on top of the pole piece.  The aluminum phase plug 

smoothes response and also contributes as a heat sink for the voice coil, 

reducing power compression. Long voice coils for all woofers (in a 

narrow gap) ensure high and uniform BL vs. excursion, to maintain 

dynamic linearity. The result is unbelievable clean bass/midrange 

reproduction.

Laminated Sandwich Cone

The cones are constructed from a fine weave fiberglass cone material 

along with a laminate of compressed, felted fiber laminate. This creates a 

stiff but still dampened cone that will remain stable even under very large 

sound pressures.   In addition, a central dustcap gives a second 

connection between the cone and voice coil.  This triangulation provides 

an incredibly rigid assembly for clean response to high level inputs.

CROSSOVER DESIGN

Great components and construction alone will not guarantee a good 

sounding system.  More than anything, the crossover is what defines the 

sound of a speaker.  The crossover determines the band of operation of 

each driver and determines how seamlessly the units transition from one 

range to the next.  It sets the octave-to-octave balance that defines the 

personality of the system.  At PSB, years of design experience, highly 

tuned sets of ears, and the unsurpassed facilities of the National 

Research Council in Ottawa, lead to superior crossover design.

With the Synchrony One and Two Towers a unique driver/crossover 

arrangement minimizes the unwanted effects of floor bounce induced 

early reflections. These reflections interfere with the direct sound and 

contribute peaks and dips to the response. 

For the entire Synchrony series the crossover slopes are acoustical 

fourth order Linkwitz-Riley type with attention paid to the direction of the 

“in phase lobe”.   The lobe, an inevitable effect of transitioning from driver 

to driver, is optimally aimed. Whether seated or standing, the frequency 

response of the system does not vary. 

Crossover components are chosen to be the best quality possible.  

Heavy multi-lamination iron cores are used for large value inductors.  

High gauge wire air cored inductors are used medium and small value 

inductors.  All capacitors are especially low loss.  Film capacitors are 

used for mid and treble sections.  Tight component tolerances and 

exhaustive testing in manufacturing ensure that each system is a match 

to the engineering references, giving you the sound quality that PSB 

designed in.

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