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Infinity Alpha 20

Bookshelf speakers (Black ash)

Item # 108A20B

The Alpha 20 bookshelf speakers are aces when it comes to combining great sound, good looks, and compact size.

The Alpha 20 bookshelf speakers are aces when it comes to combining great sound, good looks, and compact size.

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Discontinued item

Item # 108A20B

About the Infinity Alpha 20

The Alpha 20 bookshelf speakers are aces when it comes to combining great sound, good looks, and compact size. Looks like Infinity did it again! They've been designing fantastic speakers for years, and it's their innovation, research and understanding of customers' needs that brought the Alpha 20 to life.

The Alpha 20 bookshelf speakers are aces when it comes to combining great sound, good looks, and compact size. Looks like Infinity did it again! They've been designing fantastic speakers for years, and it's their innovation, research and understanding of customers' needs that brought the Alpha 20 to life.

Let's start with unique Infinity technology. The Alpha 20 boasts a 1" C.M.M.D. tweeter and a 6-1/2" C.M.M.D. woofer. C.M.M.D., or Ceramic Metal Matrix Diaphragm, is a material designed by Infinity to produce exceptionally stiff, light drivers — ideal when it comes to accurate, responsive reproduction of sound. This technology exists already in expensive, high-end Infinity lines, so it was ready to be reapplied in the more affordable Alpha line.

Another area of Infinity expertise is detailed, natural sound. Thanks to their high-tech research facility, Infinity knows just about everything there is to know about audio. The Alpha 20s use those C.M.M.D. drivers to meet Infinity's exacting standards for great sound. You get clean, true-to-life highs that float through the air, and astoundingly rich, full mid/bass delivery.

Use four Alpha 20s, the Alpha Center and a sub for exciting home theater in a medium-sized room; they also make great home theater surrounds to pair with larger Alpha speakers. Or set them up as admirable stereo speakers on their own. Plus, these elegant little bookshelf speakers boast black ash or cherry vinyl finishes, and attractive silver details under the grille — they're at home in just about any setting.

Recommended center: Alpha Center.
Recommended surrounds: Alpha 10 or Alpha 20.

Read a hands-on review of an Infinity Alpha speaker system at CrutchfieldAdvisor.com

Priced per pair

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Product highlights:

  • video-shielded
  • bass-reflex
  • frequency response 55-22,000 Hz (±3dB)
  • 8-ohm impedance
  • sensitivity 89 dB
  • handles up to 100 watts
  • black ash or cherry vinyl finish
  • 5-way binding posts
  • 8-7/8"W x 15-1/8"H x 11-3/8"D
  • warranty: 5 years
  • Our 60-day money-back guarantee
  • MFR # ALPHA20BK

What's in the box:

  • 2 Alpha 20 bookshelf speakers
  • 2 Grilles
  • Instruction Manual
  • Warranty sheet
  • Card with caution on speaker handling

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More details on the Infinity Alpha 20

Stacey B.

Features & specs

Enclosure Bass Reflex
Finish Vinyl
Color Black
Video Shielded Yes
Tweeter Type Dome
Tweeter Size (inches) 1
Midrange Size (inches) ---
Woofer Size (inches) 6.5
Woofer Composition C.M.M.D.
Woofer Surround Rubber
Power Range 10-100
Sensitivity 89 dB
Impedance (Ohms) 8
Frequency Response 55-22k Hz
Connector Type 5-way posts
Bi-amp Inputs Yes
Height (inches) 15-1/8
Width (inches) 8-3/4
Depth (inches) 11-3/8
Weight (pounds) ---
Mounting Bracket Included No
Recommended Stand Height (inches) 26-31
Parts Warranty 5 Years
Labor Warranty 5 Years

Product Research

Features

Ceramic Metal Matrix Diaphragm (C.M.M.D.): Infinity's C.M.M.D. technology delivers accurate performance with dramatically reduced distortion for incredibly lifelike sound. Additionally, the C.M.M.D. drivers can withstand extreme temperatures, moisture, humidity and sunlight.

Woofers: The 6-1/2" C.M.M.D. cone woofer virtually eliminates coloration due to cone flexing, resulting in less distortion and superior accuracy. For a smoother response and improved durability, the woofer uses a rubber surround.

Tweeters: Each speaker has a 1" C.M.M.D. dome tweeter, which offers superior stiffness and damping compared to traditional metal domes.

Bass Reflex: There is a single port tube opening on the front of each speaker for increased and extended bass response.

Dual 5-Way Binding Posts: The speaker has two sets of gold-plated 5-way binding posts connected by gold-plated jumpers. By removing the jumpers, you can separately use the two sets of binding posts to bi-amp or bi-wire the speakers. Bi-wiring will improve resolution and dynamics. For even greater improvement, you can use two amplifiers (bi-amping).

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