Alpine SPS-400

4" 2-way Type-S Series Coaxial Car Speakers

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4" Type S Series Car Speakers • 140W Max • 45W Rms • Poly-Mica Cone Woofer • Rubber Surround • 3/4" Silk Dome Tweeter • Optimized Air-Flow Design • Affordable Premium Quality Upgrade To Your Factory Audio System

Learn more about the sps400

Good news and a little bad...

This item has been discontinued

But you may be interested in the newest model that's available.

s2s40 thumbnail

Alpine S2-S40

OUR PRICE: $71.95

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Authorized dealer

  • 4" Type S Series Car Speakers
  • Power Handling:
    • Peak: 280 watts per set / 140 watts each side
    • RMS: 90 watts per set / 45 watts each side
  • Poly-mica cone woofer
  • Rubber surround
  • 3/4" Silk dome tweeter
  • Optimized air-flow design
  • Stamped steel basket frame
  • Affordable premium quality upgrade to your factory audio system
  • Great power-efficient speakers
  • Swivel-mount tweeter
  • 4 ohms impedance
  • Square-wire short voice coil
  • Low distortion strontium magnet
  • Top-mount depth: 2"
  • 1-year warranty

Alpine products are warranted solely by Sonic Electronix, Inc. under the same period and terms as the original Alpine warranty. Sonic Electronix is not an Authorized Alpine Dealer and Alpine requires all merchandise purchased by Sonic Electronix customers to be returned solely to Sonic Electronix. Alpine products are also covered by our Standard Return Policy for returns on exchanges or refunds within 30 days from the date of purchase.

Priced Per Pair

Product history:

Alpine S2-S40 thumbnail
(newest, current model)
Alpine S-S40 thumbnail
(previous model, replaced by Alpine S2-S40)
Alpine SPS-410 thumbnail
(previous model, replaced by Alpine S-S40)
Alpine SPS-400 thumbnail
(previous model, replaced by Alpine Type-S SPS-410)
Alpine SPS-10C2 thumbnail
(previous model, replaced by Alpine SPS-400)

Specifications & Details

Speaker Specifications
Speaker Size
2-way Coaxial
Tweeter Design
Tweeter Composition
Woofer Composition
Polymer/Mica Composite
Woofer Surround
Peak Power Handling
140 watts
RMS Power Handling
45 watts
87 dB
Frequency Response
80 - 22000 Hz
Impedance (Per Voice Coil)
4 ohms
Shallow Mount Installation
Top-Mount Depth (Mounting Depth)
Cutout Dimensions
5-1/16" x 5-1/16" 
General specifications
Speaker Grilles
Warranty and Return Policy
Parts Warranty Duration
1 year
Labor Warranty Duration
1 year
Warranty Provider
Sonic Electronix

Item Details


Model Number:




Internal SKU:


Internal Product ID:


Customer Ratings & Reviews

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Customer Reviews

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Alpine SPS-400

Bought these as rear, or "fill" speakers in my '35 Ford Pickup that is a Street Rod. Needed the small size, but also they needed to be able to handle the power from the Alpine amp. I had to run the amp because the exhaust and engine on the street rod is pretty loud. We mounted these behind the headliner, and the slim fit worked great! For the application I'm using them on, they work excellent. Not a lot of bass, but they're mounted only about 12 inches from your head, and I'm not running a lot of power to them. If you need a small speaker that will handle a medium amount of power, I would recommend these. Sound is smooth and full.

By Darrell on March 11, 2009


found this helpful.


Wow these speakers blew me away! I installed them on a 96 Toyota Avalon and they are excellent ! For their size they deliver CLEAR highs and great sound!! and then of course i have the 15's to take care of the bass!! GREAT PRODUCT

By Clifford on February 9, 2009


found this helpful.

Very clean sound!!!!

I have 4 of them in my car and I can say that they're very good!!!

You can hear sounds that you never heard in your favorite songs!!!

Super quality, nice soft design and for the price SONIC is the best!!!!

By Dave on February 13, 2009


found this helpful.

Great Speaker

it has nice clean highs and it hits, i have it hooked up to a 50watt 4-channel amp and the bass that comes out of it makes you think its a 6x9. great price and great overall speaker a great buy

By DJ on January 12, 2010


found this helpful.

They're great

I installed these in an 87' Toyota pickup as well as an Alpine deck.
Just 4" speakers but man they pack a bit of a punch. My old ones used to crackle and pop at over volume 5 on the alpine, these ones don't crackle or cut out at all.
I managed to break a connector pin for one of the wires off the speaker itself, so i ended up soldering the wire to the speaker. I suppose it was just manhandling, and was more human error.

By Bryan on December 19, 2008


found this helpful.

Nice speakers, great price

Ok they are 4" speakers so they aren't going to pump out a lot of bass, but they are great on the mid and high range. The price seals the deal. If you are looking for small speakers, these are the way to go.

By phyn on August 19, 2009


found this helpful.

Great speakers for the price

I've had these for about 6 months now and they perform well, especially for the price. They produce nice clear sound and decent bass. I am currently running an external subwoofer so don't have deep bass running through them, but they've handled everything else without distortion. I'd recommend them for anyone looking for a nice set of replacement speakers. I plan on hooking them up to an amplifier soon and think they will sound even better then. The only thing I wish is the tweeter was more powerful, but I think I am just used to my previous component tweeters which were a little more powerful.

By David on March 18, 2010


found this helpful.

great value

great value for the price.

By polo on March 13, 2009


found this helpful.

Good value

Good buy for your buck!They can handle a good amount of power without distortion,can get pretty good mid bass for such a small speaker and have very strong and clear highs,sometimes too strong!The only weak point is the way they reproduce the mids - around 500hz the response is not that good,may be cause they are too soft . . . Any way,good overall!

By Vladimir on December 6, 2008


found this helpful.

good price good speaker

the highs and mids are amazing. Lows are pretty week but its a 4" speaker so wat can u expect. Overall awesome price for a really good speaker.

By Billy on May 22, 2009


found this helpful.


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