Superb sound and sturdy construction! Alpine S-Series speakers deliver high-quality, reliable performance in a durable package. The hybrid pearl-mica injection poly woofer cone is strong and lightweight for extended low frequency reproduction — it's geared to handle the bass-rich output of Alpine's Bass Engine®-equipped receivers. The I-Drive low distortion circuitry improves the woofer's response, increasing low-end output while limiting distortion.

The woofer cone on the SPS-1629S 6-1/2" speaker adds hefty bass hits to the 3/8" tweeter's sparkling highs. An air-injected rubber surround resists harsh environmental conditions. Luminous high frequencies flow from the titanium-coated balanced dome PEI tweeter.

  • hybrid pearl-mica injection poly woofer cone
  • 3/8" titanium-coated balanced dome PEI (polyetherimide) tweeter
  • air-injected rubber surround
  • I-Drive low distortion circuitry (woofer)
  • frequency response 40-25,000 Hz
  • recommended power range 2-30 watts RMS
  • peak power 120 watts
  • sensitivity 91 dB
  • top-mount depth 1-13/16"
  • 1-year warranty

Priced per pair

Why replace your car's original speakers?

The speakers that originally came in your car were made from inexpensive materials, designed to create acceptable sound at the lowest possible cost to the manufacturer. If you love music, you deserve better. Name-brand aftermarket speakers deliver fuller, richer sound with considerably more detail and nuance, and they're capable of playing louder and cleaner than factory speakers. Connect new speakers to your factory radio and you'll get the best possible sound from your dealer-equipped system. Pair them up with a new car stereo for a level of enjoyment that can rival a high-fidelity home audio experience.

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Hands-on research

What's in the box?

Download owner's manual

  • Two 2-way speakers
  • 2 Grilles
  • 2 Grille frames
  • Two 14.5' lengths of speaker wire (each length of speaker wire has quick-slides on one end and bare wire on the other end)
  • 6 Self-tapping screws
  • 6 Speed clips
  • Warranty sheet

Features and Specs

Design 2-way
Tweeter Design 3/8" Balanced-dome
Tweeter Composition PEI/Titanium
Woofer Composition Pearl mica injection poly
Woofer Surround Rubber
Parts Warranty 1 Year
Labor Warranty 1 Year
Sensitivity 91 dB at 1 watt
Frequency Response 40 - 25k Hz
RMS Power Range (Watts) 2-30
Peak Power Handling (Watts) 120
Impedance (Ohms) 4
Top-mount Depth (Inches) 1 13/16
Bottom-mount Depth (Inches) N/A
Cutout Diameter or Length (inches) 5

Product Research


Woofers: Each speaker features a hybrid pearl mica injection polypropylene woofer cone. Mica adds strength and heat resistance to polypropylene, resulting in reduced distortion and improved reliability.

Surrounds: For a smoother response and improved durability, the woofers use air-injected rubber surrounds.

Tweeters: Each speaker has a 3/8" PEI and titanium balanced-dome tweeter. PEI (Polyetherimide) is a polymer that offers high resistance against harsh environmental extremes, superior rigidity, and sonic purity. When combined with titanium, the result is a tweeter that delivers crisp, clear highs.

I-Drive Design: The low distortion magnetic design provides better woofer control and smoother bass and midrange.

Bass Engine Ready: These speakers are Bass Engine Ready, meaning they can be paired with Bass Engine Equipped head units and Bass Engine Ready subwoofers to create a complete sound system that can be totally personalized.

Our Product Research Team

At Crutchfield, you'll get detailed, accurate information that's hard to find elsewhere. That's because we have our own in-house Product Research team. They verify what’s in the box, check the owner's manual, and record dimensions, features and specs. We stay on top of new products and technologies to help people make informed choices.