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Alpine SPS-406

Type-S 4"x6" 2-way car speakers

Item #: 500SPS406

In Stock

48 Reviews

Installation gear for most cars

Your price: $79.99 pair Earn up to 80 Rewards points

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Alpine hi-fi

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.

Product Highlights:

  • 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

Average Customer Review:

48 reviews
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Great speakers

Written By Bill, Wisconsin on Thursday, October 01, 2015

Crutchfield Customer Review (What's this?)

Good speakers, sound quality and easy install

Pros: Work well, ease of installation and good sound quality

Cons: None

Alpine SPS-406

Written By Trucker dude, Anchorage, Ak on Saturday, August 08, 2015

Crutchfield Customer Review (What's this?)

These work great with and sound fantastic with the rest of the alpine gear in my sons truck

1984 Porsche 911 rear deck shelf

Written By Barney, Washington on Friday, July 10, 2015

Crutchfield Customer Review (What's this?)

I wanted to retain the original speaker grilles in order to maintain the stock appearance. With the help of my Crutchfield advisor these were chosen and they fit perfectly in the existing space and with the stock grilles and they sound great! thank you.

Pros: exact fit with the factory grilles

Cons: none come to mind

Perfect fit

Written By Mike T, Alabama on Sunday, June 14, 2015

Crutchfield Customer Review (What's this?)

Installed in 1998 GMC Sierra Z71 extended cab and the speakers fit perfectly with no adapter necessary. They sound good and I'm pleased with the quality.

Pros: Easy to install (once you get the truck depaneled) and speakers sound good.

Cons: I can't think of any cons with these speakers. The only con was having to remove so many panels and my rear bench seat to install the new speakers.

Great Speakers

Written By B, Mechanicsburg, PA on Sunday, May 17, 2015

Crutchfield Customer Review (What's this?)

The sound is loud and amazing!!!!

Pros: U can crank it loud and ant going to hurt them

Cons: Not a lot of bass

Great quality, great sound

Written By Alex, Maine on Saturday, April 11, 2015

Crutchfield Customer Review (What's this?)

Alpine deserves an a+ on this one, great quality on the build. Fantastic sound for a 4x6 speaker, remember these are 4x6 speakers, bass will barely exist. The best bang for the buck in 4x6 speakers and definitely one of the best sounding 4x6 speakers on the market. I put these in a Porsche 944, for the front doors you have to use a grille assembly for the rears they fit perfectly. I have used many 4x6 speakers and these are better than excellent in my book. Make sure you use a quality headunit with a true equalizer because these definitely tend to be bright.

Pros: A+++++ build quality, A+++++++ sound

Cons: A bit bright but with the right headunit there are excellent.

Alpine SPS 406

Written By Marc, Florida on Tuesday, March 17, 2015

Crutchfield Customer Review (What's this?)

These speakers really made the difference when installed with the Alpine SPS 610C in the front doors of my Silverado. These were the last speakers installed and really helped balance the sound throughout the vehicle. Great value on a good quality speaker.

Pros: Ease of installation Great build quality Reasonable price

1997 Chevy c1500 exstened cab sound great lots highs and mids from sma

Written By Txwoodpecker, Texarkana, TX on Thursday, February 26, 2015

Crutchfield Customer Review (What's this?)

installed on 1997 Chevy exstened cab 3rd door. Lots highs and great mids

Pros: Awesome sound

Cons: Didn't fit factory location proper, had use washers to hold speaker in place

Great Speakers

Written By JarvisK, Arizona on Monday, February 02, 2015

Crutchfield Customer Review (What's this?)

Just replaced my front door speakers with these. They are excellent they fit perfectly and sound is amazing. Have been putting off replacing my front speakers. A great choice with these speakers.


Written By Anonymous, Hortense, Ga on Tuesday, January 13, 2015

Crutchfield Customer Review (What's this?)

These are great value and sound.


Written By Anonymous, Texas on Sunday, November 30, 2014

Awesome speakers. Not a ton of bass but i mean they are 4x6. Clear sound is the goal with these anyways. Best speaker available in this size class. Fits perfect in a 99-06 silver ado.

Pros: sound quality, price, high quality

Cons: none

car speakers

Written By kevin c, buena vista co. on Sunday, September 28, 2014

Crutchfield Customer Review (What's this?)

good price and sounds good

Pros: easy install

Cons: none

Alpine SPS-406

Written By Tom, Middletown, CT on Sunday, June 22, 2014

Crutchfield Customer Review (What's this?)

These speakers worked great in my buddy's jeep wrangler. We used them to replace the factory front dash speakers and they make a world of difference. Even un-amped these speakers are loud enough to hear clean, crisp sound with the doors removed and top down. Lacking base but the sound quality is stunning. The only downside was having to make custom brackets to replace the stock mounting brackets but it wasn't too bad. Overall great product, as usual great stuff from alpine and great easy buying experience from crutchfield. Fast free shipping too.

Pros: Great sound, loud, clear and crisp highs

Cons: Lacking base, custom mounting brackets for certain applications

Alpine SPS-406

Written By Anonymous, Palmer, AK on Wednesday, June 18, 2014

Crutchfield Customer Review (What's this?)

Excellent sound quality. They sound great in the back doors of my 01 GMC Sierra combined with an Alpine CDE-143BT. HUGE improvement over stock.

Pros: Great sound quality

Cons: None

alpine sps-406

Written By Nick P., glenford ohio on Saturday, June 07, 2014

They were alot better than the factory speakers that were in my 1995 s10 on a cheap Sony head unit they sounded great low bass but excellent for the size good clean crisp highs I would get another pair again any day easy install for not supposedly fitting speakers

Alpine SPS-406

Written By Anonymous, Carmichael, CA on Saturday, April 26, 2014

Crutchfield Customer Review (What's this?)

Speakers sound so much better than my stock 1999 GMC speakers did. I am just running them with an aftermarket Sony deck. Think I want to get an amp to help power them.

Pros: Clear sound. Fit fine in my stock 1999 GMC crew cab(old body style) speaker locations

Cons: None

Much better than I expected

Written By Metalman, Mount Morris MI on Monday, March 31, 2014

Crutchfield Customer Review (What's this?)

For being small speakers, they sure do kick well in my 2000 Silverado.

Pros: Moderate to difficult install in my particular application, but great sound after installation.

Cons: None so far

Excellent speakers!

Written By Anonymous, Alabama on Wednesday, March 12, 2014

Crutchfield Customer Review (What's this?)

I purchased these speakers to replace the 25 year old stock speakers in my 89 GMC Sierra and they sound great. The crystal clear highs are very nice.

Pros: Clear sound

Cons: None

2000 Silverado Happy

Written By MikeM, Houston, TX on Thursday, February 06, 2014

Crutchfield Customer Review (What's this?)

This speaker was an excellent match for my Alpine MRP-F240 amplifier and Alpine SPS-610C in front. The bass was better than I expected and the tweeters are awesome! Installation was a easy, my only minor challenge was determining which adapters to use. Over all I am very satisfied with sound quality and installation.

Pros: Great sound and installation

Cons: none

Alpine SPS-406

Written By Aloha808, Hawaii on Tuesday, February 04, 2014

Crutchfield Customer Review (What's this?)

Cherry set of coaxial speakers, got this hooked up in the rear doors of a Chevy extra cab pick up and they scream and sound very clear...

Alpine SPS-406

Written By Happy customer, Fort Hood Texas on Monday, December 23, 2013

Crutchfield Customer Review (What's this?)

I recently purchased a 2003 Jeep Wrangler that had more blown and aged speakers than working. I have ordered through Crutchfield in the past and enjoyed the ease of both finding the right set up and install equipment, so they were my only choice. The speakers and deck arrived all well packaged and a few days later. Text book install and the sound quality cant be described.

Pros: great mids and highs

Cons: none

Alpine SPS-406

Written By Anonymous, Zion Crossroads, VA on Monday, November 18, 2013

Crutchfield Customer Review (What's this?)

The sound quality is great.

Pros: Installed in my 2001 S10 Chevy with ease.

Cons: Made some adjustments but nothing major.

Alpine Speakers

Written By Anonymous, Corpus Christi, TX on Tuesday, August 27, 2013

Crutchfield Customer Review (What's this?)

I have these speakers in the rear doors of my Chevy Silverado Ext. Cab. They are running off an Alpine Reciever and the Alpine Power Pack. Have had them installed little over a week now. They sound great, but I have to have the fade set up higher on front speakers to avoid these speakers from popping. Not a big deal. Doing this makes for clean, clear sound that meets my listening needs and expectations. Install was easy. They arrived when expected. Speaker harness makes it a clean installation with no wire splicing. Very happy with my purchase. Can't beat the price. Would recommend to a friend.

Great speakers

Written By ButchE, Mount Olive, AL on Saturday, August 03, 2013

Crutchfield Customer Review (What's this?)

Installed these in my GMC Sierra 1500 ext cab 4 door. These were a breeze to install with the provided mounting brackets and wiring adapters. These provide a nice full range sound for there size. Much better than the factory ones.

Pros: Great sound and ease of installation.

Cons: None

Alpin SPS-406

Written By Dale, Nelson, NE on Wednesday, July 10, 2013

Crutchfield Customer Review (What's this?)

Great sound quality even with a stock head unit, but had to drill holes to make it fit

Pros: Great clear crisp sound

Cons: Had to drill holes to install in 1999 Chevy Silverado 3-door

Worked great for the dash of my Wrangler TJ

Written By Tom s, Huntington, WV on Monday, June 17, 2013

Crutchfield Customer Review (What's this?)

Got these speakers to replace the ones in front dash of my TJ. It is a 1998 so really had some age on the speakers. Replaced rear a while ago and fronts sounded so bad, I had "faded" my stereo to the rear. These speakers were larger and move more air to give me a full sound all the way around the vehicle now. Very happy with them and EASY to install. Crutchfield always gives you the directions and parts needed so no worries. I had this done in 30 minutes. Wife couldn't believe how fast it was finished.

Pros: Great full sound. Fit my vehicle thanks to website directions. Good price for sound.

Cons: None.


Written By kdak, columbus, oh on Monday, June 03, 2013

Crutchfield Customer Review (What's this?)

Good stuff. Produces great sound at all levels. Easy fit. I would recommend them to anyone

Alpine sps-406

Written By Anonymous, Honeoye, ny on Thursday, February 28, 2013

Crutchfield Customer Review (What's this?)

Haven't had in my vehicle long but so far sounds good and install was easy

Pros: Easy install and directions helped alot

Cons: A lot of hardware to sort through to find the right screws to use

Good speakers

Written By Ashley, North Augusta, SC on Monday, December 24, 2012

Crutchfield Customer Review (What's this?)

Good speakers, but had to modify vehicle to get them to fit properly.

Pros: Good speakers for the price and very fast shipping!

Cons: Had to make some modifications to get them to fit properly

great sound quality

Written By JarvisR, Whitewater WI on Monday, July 02, 2012

Crutchfield Customer Review (What's this?)

Sound quality is great and they pair well with my Alpine receiver.

Pros: sound

Sps-406 speakers

Written By Rick, Iowa on Thursday, June 07, 2012

These speakers are Awsome ! There is a guy on here said they only had high end tones. If they are wired wrong meaning positive and negative switched they will sound like this do to bass moves inward and not outward.

A little too bright

Written By clayr, wilmington, nc on Saturday, February 04, 2012

Crutchfield Customer Review (What's this?)

OK - as far as installation, no one beats Crutchfield - great directions, fast deliver, they rock.

Speakers - i bought because i trust the Alpine brand, but i was disappointed, if only from a perspective of how these speakers are presented for use. I bought them (along with a set of Kickers) to replace the stock speakers in my 2003 Silverado, set up with a Kenwood Excelon KDC-395. They were listed as replacements for the rear door 4x6 speakers. After the install they sound very clean, and very bright - but TOO BRIGHT. no matter how i adjusted the head unit, i could not get any low end from the speakers. So i decided i really needed 6x9's, even if i have to cut the door panel. I felt a little bad returning them, until i re-installed the stock speakers to hold me over, and they stock speakers have more low end - sounded BETTER - than these. I think they are good speakers, but better suited for a front door setup, not the rear where you need some bottom end. (I put the same head unit in my daughters car with 6x9's in the back and there is PLENTY of bottom end - even without an amp and subs).

so that's my comments - might work well in some setup, but not as the rear speakers. Get out your metal cutter and put those 6x9's in.

Pros: good sound - bright and clean

Cons: TOO bright


Written By Chris, Danbury, CT on Monday, August 29, 2011

Crutchfield Customer Review (What's this?)

I installed this myself in the dash of my 2001 s-10 Zr2. Everything said they won't fit in stock spots without modifications. I plugged them in to my factory wiring with the wiring adapter that was included n with no modifications they fit tightly . They sound awesome along with the alpine cda-105 headunit, and the alpine SPS-600C Type-S 6-3/4" component speakers n tweeters Rock out clear n great. Cannot wait to add my jvc arsenal 10" sub! These speakers way surpassed my expectations for $79.99!!!!!!!!!

porsche 944

Written By mike, Totowa nj on Saturday, August 20, 2011

Crutchfield Customer Review (What's this?)

First of all I want to say that I love dealing with Crutchfield! They're always very helpful when you have problems! I really like these speakers a lot! They sound great with my JVC BonJiovi powered stereo! Crisp and clear! Especially for only being a two way speaker! There might be better speakers out there than these but they wouldn't fit in the front doors of my car. Trust me.. The price of these is very very low for the quality of the sound! Not a ton of bass but there's no way of getting that from a 4by6!

The front speakers just barely fit in and the grill is bulging out just a little bit. But in the rear I could have gone with something a little bigger magnet wise... but still stay with a 4 by 6. The hardest part of the rear install was pulling the vinyl apart without tearing it! (fingertip strength) The rest is really not that hard! I built up the rear footwell with a lot of layers of foam so that I could sit back there and work!

Alpine SPS-406

Written By Adam, Tulsa Ok on Saturday, November 20, 2010

Crutchfield Customer Review (What's this?)

Replaced my stock 4x6 speakers in my 03 ext cab silverado. Huge improvement,
clarity and range of music are the biggest changes. Install was easy although
the speaker installation instructions are lacking. Crutchfield instructions
included helped out with proper and simple door removal. Overall very
satisfied. Still running them on the stock stereo, power handling dictates
turning the volume up a little more than before with stock speakers. Love the
sound, very good alpine speakers.

2002 cavalier

Written By Tyler, Abington Pa on Saturday, August 21, 2010

To start off i just bought a 2002 cavalier, and i wanted to upgrade my audio system. So I got a full system. I got a Kenwood Excelon KDC-X494 headunit, these 4x6 sps alpine speakers for the doors, 6x9 sps speakers for the rear, Kenwood KAC-6404 4 chan amp for the speakers, a jh600 mtx mono block amp, and a JL Audio 12W3v3-4 subwoofer.

I also put bass blockers to these speakers because thats what my subwoofer is for. I did test the bass before adding the blockers, and it was fine for a 4x6, but not great. I will say however the mids and highs sounded great with my amp. I would suggest these to anyone building a system. They make my music sound full and lively.

Adapter brackets did the trick

Written By Rod, Raleigh, NC on Wednesday, June 09, 2010

Crutchfield Customer Review (What's this?)

These speakers fit perfectly in my '91 Corvette. The OEM's have a rectangular frame and these came with two different adapter plates to choose from to create a perfect fit.

Alpine SPS-406

Written By joey, clifton, nj on Sunday, January 31, 2010

just installed these in a 04 chevy cavalier. it says they dont fit but it was a perfect fit. they sound great! it and it was a perfect install no mod required to get them to fit into the factory brackets!

Improvement over Wrangler Stock Speakers

Written By Anonymous, Mt. Pleasant on Wednesday, January 06, 2010

Crutchfield Customer Review (What's this?)

I paired the SPS-406 with Alpine SPS-500s in the roll bar and a Kenwood KDC-X493 head unit. A noticeable improvement over the cheap paper stock speakers on the 2005 Wrangler. A little more bass comes out and the mids and highs are clean & crisp. Don't make the same mistake I made and expect miracles from these speakers. A woofer and tweeter of this size can only do so much. Crutchfield provided prompt service as always and their technical support is awesome. The installation instructions on the speaker box made pairing up the speakers to the adapter plates a real chore.
[Editor's Note: The adapter needed to install 4x6" speakers in the wrangler dash is no longer available. We now recommend 4" speakers for this location.]

Great Speakers!

Written By Daniel, Fort Knox, KY on Wednesday, October 14, 2009

Crutchfield Customer Review (What's this?)

First- If you are buying these for the rear panels of an 88-93 Chevy Truck, these are NOT direct fit!!! The opening needs to be slightly modified to accept the metal spacer, or the trim will have to be modified if you use the plastic spacer (which works a little better IMO). As for the speakers, they sound absolutely terrific. Clarity even at very loud volumes is excellent. If you expect a lot of low end, you're looking at the wrong size speaker. These work best with bass blockers and a subwoofer installed for low-end frequencies. They can handle plenty of power, so match them up with a strong enough head unit to maximize results. Great mid and high tones, and as i mentioned before, clarity is awesome. Instructions in the box are terrible. It took me about 30 minutes to figure out what the diagram (no written instructions) were showing, but maybe that was just me. As always, Crutchfield is great and gives you everything you need to do the install except for the trim removing tool (you'll need it). Overall, very pleased with these speakers!

Cant beat the price

Written By Rafael, Santa Clara, Ca on Thursday, June 18, 2009

Crutchfield Customer Review (What's this?)

Let's face it, for the price you pay for these speakers you can't go wrong.
Try hooking these speakers up to an amp, you'll love the way they sound
for the price you pay. I would buy these speakers again.

Great Buy!!!

Written By John, North Dakota on Friday, May 22, 2009

I bought these speakers wanting a crystal clear sound. I got just that, I am only putting 18 watts into each of the 4 speakers in my 1993 extended cab silvarado and these are loud. They dont have much bass but thats what a sub is for. I would definatelly suggest these speakers to anyone looking for a good sounding system. Good shipping Crutchfield!

These do not fit 3d generation Firebirds

Written By sam, huntsville al on Sunday, March 22, 2009

Crutchfield Customer Review (What's this?)

purchased these for my 83 Firebird as the web site indicated they would fit... Web site is incorrect.. these do not fit 3d generation firebirds not sure about camaros...but since they share the same body I suspect they will not

Contacted crutchfield and servce tech indicated his reference showed these speakers are not a fit...I pointed out the incorrect info on the web site and he gave me a return lable and shipped me some kenwood's that should fit.

I did plug the speakers in to give a listen...they sounded great...too bad hey do not fit

Alpine SPS-406

Written By raul, San Antonio, Tx. on Sunday, January 18, 2009

Crutchfield Customer Review (What's this?)

Good quality sound.

Great sound, 01 Silverado

Written By Christopher, Siler City, NC on Monday, November 17, 2008

Crutchfield Customer Review (What's this?)

These speakers sound great. I have them in the back doors of my 01 Silverado extended cab. They fit perfectly, I only had to drill holes for the mounting bracket, but that was pretty easy. I am extremely satisfied with the way these sound. They are paired up with a set of Alpine SPS-600's in the front doors and a CDA-9884 head unit. I am not running an amplifier or sub, but this combo still sounds great.

Alpine SPS-406

Written By tpchallenger, Chicago Il. on Thursday, October 23, 2008

Crutchfield Customer Review (What's this?)

Put these speakers in my Buick Skylark doors. All kinds of highs and lows. Sounds great!


Written By Ryan, Apple Valley, Ca on Wednesday, September 10, 2008

Well I started by removing the factory speakers (which were a very poor quality) then soldered the new harness and connectors to the factory wire.

The negative and only reason I didnt give 5 stars was because I had to re-drill 2 new mounting holes per speaker because of the backing on the speaker.

Other than that excellent product, somewhat easy install, beginners should seek help of a knowledgeable person to oversee the process.

Saves you time and money.

Crisp, Clean, Brilliant.

Written By Michael, Succasunna, NJ on Thursday, May 08, 2008

Crutchfield Customer Review (What's this?)

You cant ask for
anything more in a
4x6 speaker. The
highs are great and
they can still
handle a little
bass. These can get
very loud and still
sound enjoyable.
The distortion at
high volumes is
minimal. They sound
way better then the
$100 speakers I
switched them with.
I have these amped
and hooked to an
after marked head
unit, which I would
recommend. I am
very satisfied.

Hands-on research

What's in the box?

Download owner's manual

  • 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

Product Research


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.

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