Hourglass duct

The pressure that pushes the air inside the reflex duct is extremely high. Consider the analogy of hydraulic lines that push water upward. As the high increase loses fluid pressure, the jets lose speed and weaken. Hence the goal must be to retain the optimal pressure within the reflex duct to ensure a consistent strength in the acoustic wave, while avoiding the audible noise when pressure speeds over 130km/h. The photograph aside demonstrates the reflex duct section with the Hourglass hyper-exponential, in a Serendipity.

General Specifications:

Configuration: 5-way Reversed Vertical Alignment Free-Standing

Drivers

1 Tweeter 32 mm SILVERSOFT™ dome NdFeB motor

1 Midrange 130 mm ROHACELL® Poly-Ring NdFeB motor

1 Woofer 130 mm ROHACELL® Full-Apex™ Poly-Ring NdFeB motor

1 Woofer 170 mm ROHACELL® Full-Apex™ Poly-Ring NdFeB motor

2 Sub 320 mm Natural Fibres – 2 Waves Surround HF motor

Sensitivity: 93 dB SPL normalized to 1 m / 2.83 Vrms / decollated L/R pink noise in ITU-R BS 1116-1 compliant listening room

Low frequency cut off: 23 Hz @ -3dB referred to C4 WETS

Crossovers: 240 / 500 / 1250 / 1850 Hz

Rated impedance: Modulus 4 Ω ( min 3.0 ) Argument ±36°

Low frequency load: NRS 2π sr Vented Isobaric Compound

Vent geometry: Bidimensional Hyper-Exponential Hourglass Type

Finishing: Solid Walnut  & HDF

Size: 1610 mm x 400 mm x 580 mm ( H x W x D )

Weight: 100 Kg / 220 pounds ( each speaker )

Speaker orientation: Speakers should be tilted inward facing the listener

Listening distance & layout:

Optimum speaker-listener distance > 3.5 meter
A carpeted floor in front of the speakers is recommended

Distance to side and back walls 

Should be at least 1 meter away from the speaker front baffle

Suggested amplifiers in normal amping: 400 watt @ 4 Ohm

Run the cable from the power amplifier to the lower terminals of the
subwoofer binding post, then connect upper terminals to the mid-high unit
binding post by means of the short cable with banana plug provided with the
speakers.

Suggested amplifiers in bi-amping: 200 watts @ 4 Ohm

Run the cable from the power amplifier to the lower terminals of the
subwoofer binding post leaving upper ones idle. Repeat to connect the power
amplifier to the mid-high unit binding post ( two terminals only )

Warranty: 5 years Worldwide

Spare parts availability: All the spare parts will be available for 15 years after the
model will be discontinued.