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Type-S 4"x6" 2-way car speakers
Our take on the Alpine SPS-406 by Crutchfield's Buck Pomerantz
Alpine combines outstanding materials with superior construction to create their Type-S Series speakers. Upgrade your factory speakers with these Alpines, and they'll fill your vehicle with high-fidelity sound at a reasonable cost.
The SPS-406 4"x6" speakers use strong, lightweight polypropylene-mica woofers to handle the lower frequencies. Air-injected rubber surrounds keep cone movement under tight control, eliminating distortion and enhancing bass. Stamped steel frames provide rugged support for these speakers, and their low profile allows them to fit in more factory locations.
The 3/4" silk dome tweeters play your high notes smoothly and comfortably with no hint of harshness. You can also swivel the tweeters up to 10 degrees to improve the stereo image at your listening position. These efficient Type-S speakers will sound great with a low-powered factory radio, but they're also made to handle the high power output of an external amplifier. Grilles are not included — factory grilles are appropriate for most installations.
Priced per pair
Note: Sorry, Crutchfield cannot ship Alpine products to Guam or Puerto Rico.
Good speakers, sound quality and easy install
What's in the Box:
- Two 2-way 4x6" speakers
- 2 Plastic metric-to-standard adapter rings (for top-mount applications)
- 2 Metal metric-to-standard adapter rings (for bottom-mount applications)
- 2 Plastic bottom-mount spacer rings
- 2 Strips of self-adhesive foam
- Two 12" lengths of speaker wire (each length of speaker wire has quick-slides on one end and bare wire on the other end)
- Eight 13/16" self-tapping screws
- Eight 5/8" self-tapping screws
- Eight 1/4" self-tapping screws
- 8 Machine screws
- 8 Flat washers
- 8 Speed clips
- 8 Speed nuts
- Warranty sheet
- "Important Notice!" note
- 4"x6" 2-way speakers (pair)
- polypropylene-mica woofer cone with air-injected rubber surround
- 3/4" silk dome tweeter
- power range: 2-45 watts RMS (140 watts peak power)
- frequency response: 93-22,000 Hz
- sensitivity: 87 dB
- top-mount depth: 1-3/4"
- warranty: 1 year
- Our 60-day money-back guarantee
Alpine SPS-406 Reviews
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Features and Specs
|Parts Warranty||1 Year|
|Labor Warranty||1 Year|
|Sensitivity (1W at 1 meter)||87|
|Sensitivity at 2.83 volts||N/A|
|Frequency Response||93 - 22k Hz|
|Minimum RMS Wattage||2|
|Maximum RMS Wattage||45|
|Peak Power Handling (Watts)||140|
|Top-mount Depth (Inches)||1 3/4|
|Bottom-mount Depth (Inches)||1 7/8|
|Cutout Diameter or Length (inches)||0|
Poly-Mica Cone: Each speaker features a Poly-Mica cone. Mica adds strength and heat resistance to polypropylene, resulting in reduced distortion and improved reliability.
Air-injected Rubber Surrounds: For a smoother response and improved durability, the woofers use air-injected rubber surrounds.
Silk Dome Tweeters: Each speaker has a 3/4" Wide-Range Silk Dome Tweeter for smooth high frequencies.
Highly Efficient Design: The SPS-406's high-efficiency design allows the speaker to be run off of your factory or aftermarket head unit, resulting in an easy system improvement for many vehicles requiring a 4x6" speaker.
Shallow-Design: The Alpine SPS-406 features a stamped steel shallow frame. This shallow mounting design allows for easier installation in a wide range of door panels giving you a perfect fit.
Mounting: The speakers can be mounted in a metric 4x6" opening, or, using the supplied adapter rings, the speakers can be mounted in a U.S. standard 4x6" opening. The speakers also come with bottom mount spacer rings.
No Grilles: No grilles are included with this speaker.
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.
Product reviews from the Crutchfield Labs
by Robert Ferency-Viars
We listen to Alpine Type-S, Polk Audio DXi, Infinity Reference X, and Rockford Fosgate Punch car speakers in the Crutchfield Labs.