Alpha B1 Bookshelf

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Meet PSB’s most acclaimed compact, budget-friendly speaker.

For decades, the Alpha B1 has been trusted by audio experts as the reference model for monitor speakers, making it one of the most reviewed bookshelf speakers ever. Starting from scratch at Canada’s national acoustic labs, the Alpha B1 is a true two-way design that uses a 5¼” (133mm) woofer made of metalized polypropylene, paired with a ¾” (19mm) aluminium dome tweeter to deliver crisp full-range sound with accurate and detailed bass. It uses the Alpha Series’ patented bass reflex design that utilizes the rear-firing port tube to improve efficiency and bring the bass response down below 60Hz.

  • ¾” (19mm) Ferrofluid cooled aluminium dome tweeter with front waveguide
  • 5¼” (133mm) Textured polypropylene mid/bass woofer with rubber surround
  • Bass reflex cabinet design with a rear-firing port
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Brand

ALPHA

Region

CA, EU, GB, US

Enhanced tweeter for better dispersion
The Alpha B1 is equipped with a ¾” (19mm) aluminium dome tweeter that utilizes ferrofluid cooling to enhance high frequencies and deliver a layer of accurate sound with crisp detail. Coupled with a neodymium magnet for high sensitivity, a ferrofluid cooled tweeter also prevents dynamic compression and limits distortion when the volume starts to climb. The tweeter’s front waveguide is uniquely placed to smooth the response at the crossover for improved on and off-axis performance.

Cleanest, most natural bass possible
The B1’s all-new custom 5¼” (133mm) woofer is constructed from an injection-moulded polypropylene cone and has been redesigned to reduce breakup modes and lower distortion at full excursion. Hand-assembled and finished with an attractive metalized look, the innovative midbass woofer is supported with a dual-layer voice coil to deliver excellent midrange detail and distinct bass. The B1 is also a bass reflex design that utilizes the rear-firing port tube to control low frequencies with pinpoint accuracy.

Purpose-engineered for the ultimate system
Designed and engineered in Canada, PSB built the B1 with high-quality MDF to strengthen the cabinet and minimize unwanted vibrations that can compromise sound quality. Its plastic moulded front and rear baffles are internally ribbed and connected together to add rigidity to the speaker’s solid enclosure. Plus, the cabinet’s subtle curvature and high-quality woodgrain vinyl finish the speaker with class and elegance, while their compact size makes it easy to tuck the speakers into any room.

  • ¾” (19mm) Ferrofluid cooled aluminium dome tweeter with front waveguide
  • 5¼” (133mm) Textured polypropylene mid/bass woofer with rubber surround
  • Patent bass reflex cabinet design with a rear-firing port
  • Aluminium detachable grilles perforated for acoustical transparency
  • Five-way gold-plated speaker binding posts speakers
  • High-quality woodgrain vinyl finish in Black Ash
Brand

ALPHA

Region

CA, EU, GB, US

Frequency Response

On Axis @ 0° ±3dB

65-21,000Hz

Off Axis @ 30° ±1 1/2dB

65-10,000Hz

LF Cutoff -10dB

55Hz

Sensitivity

Anechoic Chamber

89dB

Listening Room

91dB

Impedance

Nominal

8 Ohms

Minimum

4 Ohms

Input Power

Recommended

10 – 90 Watts

Program

60 Watts

Acoustic Design

Tweeter (Nominal)

3/4” (19mm) Aluminium Dome with Ferrofluid

Woofer (Nominal)

5 1/4” (133mm) Metalized Polypropylene Cone Rubber Surround

Crossover

3,000Hz, B3

Internal Volume

0.29 cu ft (8.3L)

Design Type

Bass Reflex, 1 1/2” (70mm) Rear Port

Dimensions / Weights / Finish

Size (W x H x D)

7 1/8 x 11 7/8 x 9 3/4”*
(178 x 299 x 247mm)

Weight

10.2lb (4.6kg)/each
22.4lb (10.2kg)/pair

Finish**

Black Ash
Sienna
or Dark Cherry

Notes

* Non-metric measurements are approximate.
** Some finishes may not be available in all models and/or all countries.
All specifications are subject to change without notice.

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