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Surround Design: A Synchrony S speaker is two 2-way speakers
built into one triangular shaped cabinet; each having its own woofer, tweeter,
and crossover. The drivers are mounted on baffles facing in different
directions, approximately 120° apart. Because the two speaker sections are wired
to discrete terminals there are multiple ways to connect the drivers; as a
dipole speaker (out of phase using the included jumper wires), as a bipole
speaker (in phase using the factory installed jumpers), or as two separate
channels. If you're mounting the speakers on the side walls in line with your
listening position, the dipole mode will create a diffuse, ambient soundfield.
If you're placing them behind your listening position, the bipole mode fires the
drivers in phase to flood the area with surround sound. It's also possible to
use one pair of Synchrony S speakers for both surround and surround back
channels, wiring the forward firing baffles to the surround channels and the
rear firing baffles to the surround back channels.
Cone Design: The woofer cones are a laminated sandwich
design; each has a fine weave fiberglass layer along with a compressed, felted
natural fiber laminate. The result is a rigid cone with added damping
properties. The central dustcap offers a second connection to the voice coil to
improve bass and midrange control. The inherent distortion resulting from the
magnetic field generated by the input signal reacting with the field in the
magnetic structure's air gap and the self-induction and impedance that varies
with cone movement are addressed using an aluminum shorting ring within the
magnet structure, an aluminum phase plug on the pole piece, and a shorted copper
turn on top of the pole piece. The aluminum phase plug also mechanically
smoothes the response and acts as a heat sink for the voice coil, reducing power
compression. The drivers use cast aluminum baskets and rubber surrounds.
Tweeters: The 1" titanium, Ferrofluid cooled dome tweeters
have a neodymium motor structure and an aluminum heat sink. The mass (low) and
stiffness (high) are optimized for the required wide frequency response.
Crossover Network: The crossovers (two networks per speaker)
are 2-way acoustical fourth order Linkwitz-Riley type with a 24 dB/octave slope.
Tight tolerances were used when choosing the crossover components; heavy
multi-laminated iron cores are used for large value inductors, high gauge wire
air core inductors are used for medium and small values, all the capacitors are
low loss and film capacitors are used for the midrange and treble frequencies.
Cabinet: The cabinet is an integral part of speaker design
and has a dramatic effect on the overall sound of a speaker. PSB uses a
combination of aluminum and wood in the construction of the Synchrony S. Both
speaker baffles are made of double wall aluminum extrusions. The aluminum panels
are very rigid and precisely machined with contours to preserve the sonic
characteristics of the drivers. The front, top, and bottom panels are seven
layers of 3mm MDF, curved for added stiffness, with a wood veneer exterior.
While rigid, MDF also has inherent damping properties to absorb energy that
might otherwise color the music.
Dual Binding Posts: The dual 5-way binding post input terminals are
located on the lower rear of the speaker cabinet. Out of the box the two sets of
binding posts are shorted together (in phase) by gold-plated jumpers. With the
jumpers removed the two sections of the speaker can be wired out of phase
(dipole) using the included jumper wires, or wired to separate channels. The
binding posts will accept spade connectors, single or dual banana plugs, pin
connectors, and bare wire up to 8 gauge.
Mounting: The Synchrony S can be wall mounted using the
included brackets. The bracket adds approximately 3/16" to the depth of the
- On Axis @ 0°: 62-23,000 Hz (+/-3 dB)
- On Axis @ 0°: 65-20,000 Hz (+/-1.5 dB)
- Off Axis @ 30°: 65-10,000 Hz (+/-1.5 dB)
- Low Frequency Cutoff -10 dB: 55 Hz
- Anechoic Chamber: 86 dB
- Typical Listening Room: 88 dB