Ultra Bookshelf (Black Oak)
THB
72700

Frequency Response / 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.

Speaker Specs:

  • Bookshelf Loudspeaker
  • Real black oak veneer and piano gloss black finish options
  • Dual gold-plated 5-way binding posts
  • 1.7” wide-flared rear-firing port
  • Cloth grille with pin/cup retention system
  • Elastomer stick-on bumper feet (adds 3mm to height)
  • Cabinet Dimensions: 15” (H) x 8.5” (W) x 10.6” (D) (without grille)
  • Overall Dimensions: 15” (H) x 8.5” W x 10.9” (D) (with grille)
  • Shipped Dimensions: 24" (H) x 20" (W) x 14" (D)
  • Weight: 19 pounds
  • Shipped Weight: 42 pounds

Driver Specs:

1” Aluminum Dome Tweeter:

  • FEA-optimized diffuser for airy and unveiled presentation
  • Aluminum dome delivers exceptional transient response and exceptional stiffness/mass ratio

6.5” Woofers:

  • Composite glass-fiber cone with excellent stiffness/mass ratio for high sensitivity and pistonic behavior beyond pass band.
  • Aluminum shorting rings to reduce gap inductance and lower distortion
  • Long stroke motor and suspension for high output
  • Vented voice coil formers to minimize air compression artifacts at high drive levels

Crossover & Cabinet Specs:

Crossover:

  • 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, outstanding phase coherency, and total radiated sound power
  • Tweeter-to-woofer crossover: 2 kHz

Cabinet:

  • 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
  • FEA-optimized bracing reduces cabinet resonances

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