Instruction Manual

ULTRA BOOKSHELF

Frequency Response and Electro-Acoustic Data:

• Rated bandwidth: 45 Hz-32 kHz (± 3 dB).

• Nominal impedance: 8 ohms.

• Sensitivity: 87 dB (2.83V @ 1 meter full-space, 300-3kHz).

• Recommended ampliﬁer power: 20-150 watts

Loudspeaker Physical Description:

• Dimensions (HxWxD): 14.9" x 8.5" x 10", 37.8 x 21.6 x 25.4 cm.

• Weight: 19 lbs., 8.6 kgs.

• Dual gold-plated 5-way binding posts.

• 1.7” rear-ﬁring port.

• Cloth grille with pin/cup retention system.

Driver Array and Technical Highlights:

• 1" tweeter features FEA-optimized diffuser and aluminum dome.

• 6.5" woofer features composite glass-ﬁber cone, aluminum shorting ring, cast aluminum

basket and vented voice coil former.

SoundMatch Crossover Network:

• 2-way crossover with premium-grade capacitors, air-core inductors and heavy-trace

printed circuit boards.

• Crossover frequency and slopes optimized for excellent off-axis polar response, outstand-

ing phase coherency, and total radiated sound power.

• Tweeter-to-woofer crossover: 2 kHz.

Cabinet Construction Technical Highlights:

• Precision CNC-manufactured cabinet with extensive internal blocking and bracing,

resulting in no resonances and excellent rigidity.

• Acoustically transparent and FEA optimized grilles, wedge-shaped front bafﬂe and

ﬂush-mounted drivers all contribute to reduced edge diffraction and improved on-axis high

frequency response.

ULTRA SPEAKER FEATURES & SPECIFICATIONS