Monitor 45B

2-Way Bookshelf Loudspeaker

  • Impressive performance, even when driven by modestly-powered amplifiers or receivers
  • Solid, highly efficient design with Dynamic Balance® tweeter and drivers
  • Stylish, modern speakers with Titanium faces come in black or cherry wood grain finishes
  • Free ground shipping on all orders

Classic Performance

High performance audio comes in a high efficiency design with the Monitor 45B. Whether mounted on the wall or on a stand, this dual-driver bookshelf loudspeaker supplies medium to large rooms with open, spacious and clear sound. Setting the standard for elite home audio, the Monitor 45B delivers the finest in Polk Audio sound quality.

  • Tech Specs
  • Reviews
  • Q & A
Tech Specs


  • Total Pieces


  • Drivers Warranty
    5 years
  • Original Purchaser Only

Bookshelf Speaker

  • Qty Included
  • Availability
  • Height
    15.75" (40.01 cm)
  • Width
    7" (17.78 cm)
  • Depth
    12" (30.48 cm)
  • Weight
    16 lbs (7.26 kg)
  • Driver Complement
    • (2)  5.25" (13.34 cm) d (Round) Midrange - Tweeter
    • (1)  1" (2.54 cm) d (Round) Tweeter - Tweeter
Q & A

Dynamic Balance® Tweeter

1” (25mm) silk/polymer composite dome tweeter with neodymium magnet structure delivers realistic vocals and instrumentals.

Dynamic Balance® Drivers

Dual 5.25” composite drivers are lightweight and stiff with better damping for lower distortion, excellent midrange clarity and high efficiency bass.

Critically-Tuned Port

Flared port minimizes “chuffing” to reduce distortion for rich, natural sound and deep, full-bodied bass.

Superior Materials

Crossovers with Mylar bypass capacitors provide detailed high frequencies, while 5-way binding post connectors offer secure connections.

Solid Construction

Non-resonant, all-MDF enclosure with 0.75” thick baffles ensures cleaner, clearer, more lifelike sound quality.

Efficient Design

Small-diameter drivers deliver wide dispersion, better mid-range and detailed bass response for open, three-dimensional sound.

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