Напольная акустика — YG Acoustics SONJA 3.3

The Sonja 3.3 is a passive three-way floor-standing loudspeaker in the Reference range of YG Acoustics, and it follows the Sonja 3.2 in the same family. Its cabinet is designed, fabricated and assembled at the company's facility in Arvada, Colorado. In the United States the Sonja 3.3 is priced at USD 146,800 per pair, with silver and black as the two standard finishes and other colours offered to special order.

Key specs that matter

Each tower carries five drivers. A 26 mm Lattice hybrid tweeter sits on what YG calls an advanced airframe, two 15 cm aluminium cone BilletCore midrange units run on neodymium magnets, and two 26 cm aluminium cone BilletCore woofers use motors with ultra-high field strength. YG states usable output from below 20 Hz up to 40 kHz. Sensitivity is 88 dB, average impedance is 4 ohm and the lowest point of the curve falls to 2.8 ohm. Each enclosure measures 179 cm high, 43 cm wide and 72 cm deep, and the weight is 225 kg per speaker.

Engineering and use context

Two layers of aerospace aluminium form the enclosure, with constrained layer damping sandwiched between them, a method that turns panel vibration into heat instead of letting the walls radiate it. The passive network belongs to YG's Ultracoherent family and splits the band at 90 Hz and 1.85 kHz. Across the region where neighbouring drivers are within 20 dB of each other in output, their relative phase is held to plus or minus 5 degrees, so the units add together as one source through each transition. Parts inside the crossover include custom capacitors, among them pure metal foil types, several kinds of foil resistor and inductors damped against resonance. YG laid out the boards with computer optimisation to reduce interaction between neighbouring components. Setting the lower split as low as 90 Hz leaves the pair of woofers to handle only the deepest octaves, while the twin midrange cones carry everything up to the tweeter.

Pairing

The low minimum impedance means the amplifier has to supply real current into a low load, so solid-state stereo amplifiers or monoblocks that are specified into 2 ohm are the safer choice over low-powered valve designs. With its sensitivity the speaker does not need extreme power, but the low impedance sets the demand. Given the mass per cabinet, the floor under each tower and the path into the room also need checking before delivery.

Alternatives

The YG Acoustics Titan is a larger five-way tower in the same brand portfolio, standing more than two metres tall with a 32 cm sub-bass driver.