Boston Acoustic's S series speakers let you enjoy clear, natural sound, even with a low-powered system. And with a wide variety of sizes, you'll find a set for most commonly-sized speaker openings.

The Boston S35 3-1/2" speaker features a 3/4" tweeter with a built-in cooling system for long term reliability and excellent power handling. A contoured tweeter plane guides high-frequency output to create a larger listening "sweet spot," while Boston's Amplitude Modification Device (AMD™) reduces harshness in the upper mids for clear, detailed sound.

The sturdy woofer cone teams up with a durable butyl rubber surround to produce tight, clean upper bass with minimal distortion. And you'll hear a smooth blend between the woofer and tweeter, thanks to the built-in crossover.


Priced per pair

Product Highlights:

  • 2-way 3-1/2" speakers (pair)
  • copolymer woofer cone with rubber surround
  • 3/4" Type-S3 soft dome tweeter
  • power range: 2-30 watts RMS (60 watts peak power)
  • frequency response: 100-20,000 Hz
  • sensitivity: 92 dB
  • top-mount depth: 1-11/16"
  • warranty: 2 years
  • Our 60-day money-back guarantee

Hands-on research

What's in the box?

Download owner's manual

  • Two 2-way speakers
  • Two 8" Lengths of speaker wire (each length of speaker wire has quick-slides on one end and bare wire on the other)
  • Eight 1" Hex head screws
  • Allen wrench driver attachment
  • 8 Speed clips
  • 8 Butt connectors
  • Specification sheet
  • Warranty card
  • Product registration card

Product Research

Features

Tweeter: The type-S3 3⁄4-inch tweeter's soft dome is Ferro fluid cooled for excellent power handling and reliability. The AMD (Amplitude Modification Device) located on the tweeter plane provides acoustical tuning for the midrange response while the shape of the tweeter plane improves off-axis response.

Woofer: The copolymer woofer cone with durable butyl rubber surround stands up to the harsh automotive environment.

Crossover: Each speaker in Boston's S line features a specifically tuned crossover to deliver the best transition between the woofer and tweeter.

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 open the box, verify contents, 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.

Boston Acoustics S35 Reviews

Average Customer Review:

24 reviews
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Boston Acoustics S35

Written By Dan, Henderson, MN on Thursday, September 29, 2011

Crutchfield Customer Review (What's this?)

Sound great and fit my 1981 Mercedes 300D even thought it said it wouldnt. Just had to moung from below to clear the factory speaker cover. Was easy to mount only one extra mounting hole was needed.

92 C1500

Written By Anonymous, St Louis on Sunday, February 27, 2011

Crutchfield Customer Review (What's this?)

Nice sound. They don't quite fit in the dash of 92 C1500, so if you are looking
for a perfect fit you don't want these. They fit well except the stock covers
touch.

Great 3.5 dashes

Written By T class, baltimore, MD on Monday, February 14, 2011

Crutchfield Customer Review (What's this?)

going in with 2006 Grand cherokee limited with boston acoustics system,

and I came out with two BA S35's that were louder and crisper then the older speakers.


I recommend this for anyone who is looking for an easy fit in a 2005-2010 grand cherokee.

Perfect fit in a 2003 Saab 9-3 Arc

Written By PECo, Avon, CT on Tuesday, January 25, 2011

Crutchfield Customer Review (What's this?)

The sound from the dash speakers on my 2003 Saab 9-3 Arc has always been a little
muddy, so I finally swapped out the OEM Pioneer speakers for Boston Acoustics S35s.
The Pioneers are two piece units with separate tweeters, but the S35s fit perfectly in
place of the mids. The only difficulty I had with the installation was finding a torx driver
that was short enough to clear the windshield when removing and reinstalling the
screws. This was an easy, inexpensive, "I wish had done it years ago" mod.

The S35s are much brighter and louder than the Pioneers ever were. I've had to turn the
bass on the system all the way up to balance them out, but the overall sound is much
more clean, clear and crisp than it ever was before. The muddiness is gone. The Saab's
OEM amp setup limits what you can do to the sound of the system without replacing or
bypassing them. This is definitely the "biggest bang for the buck" improvement you can
make to it.

dosnt fit 2005 Jetta

Written By david, Leominster Ma on Saturday, January 15, 2011

Crutchfield Customer Review (What's this?)

the speakers ar too deep and cause the gril to bow out making almost impossible to put the window switch assembly back in place very disappointed

nice sounding speakers

Written By tiger, fremont ohio on Saturday, November 13, 2010

Crutchfield Customer Review (What's this?)

i installed these in a 86 chevy truck. fit in the dash perfect. came with everything i
needed. great item and sounds great.. along with great service...

Boston Acoustics S35

Written By Doc Russ, Griffin, GA on Saturday, October 16, 2010

Crutchfield Customer Review (What's this?)

Hey, what is there to say? They are Boston Acoustics!

Great Sounding Speakers for the Price

Written By Alex L, Fort Wayne, IN on Wednesday, October 13, 2010

Crutchfield Customer Review (What's this?)

I purchased these speakers recently and they sound great. I have them hooked up in my 84 Buick Grand National. The crutchfield car selector thing said that these speakers wouldn't fit without modification to the car. The speakers fit perfectly with NO modification and sound great with both the stock radio and an aftermarket head unit. I am very pleased with the clarity of the sound. I would recommend these speakers to a friend.

Excellent clarity and sound

Written By Chris, Indiana on Tuesday, March 09, 2010

Crutchfield Customer Review (What's this?)

Bought these for a 2008 altima sedan (non-Bose) dash install. Replaced stock speakers with these and it made a big difference. I have an Alpine CDE-102 with the in-line amp KTP-445 installed. I added a bass blocker in-line to filter out some lower frequencies (< 800 Hz).

These were a definite improvement and brought my soundstage forward with increased clarity. Snares, drums and vocals are much clearer now and I even had to adjust my treble ranges down a bit (they are brighter than stock). They aren't shrill at all though, just clean. Better than my Infinity's I've had (which always sounded bright bordering on harsh). Highly recommended.

Boston Acoustics S35

Written By JEFF, Asheville, NC on Thursday, February 04, 2010

Crutchfield Customer Review (What's this?)

I bought these speakers for the dash of my 1983 Chevy truck. They fit, but modification to the supplied brackets will be required if you are using a new replacement dash pad. The speakers are thicker than the factory units, which causes interference with the dash pad making it not fit properly. I modified the brackets to make the speakers fit under them instead of on top. Problem solved. My dash pad fit like it was supposed to. The sound out of these little speakers is incredible, much better than I expected. Great buy.

Boston Acoustics S35

Written By Carl, Youngstown,ohio on Saturday, May 16, 2009

Crutchfield Customer Review (What's this?)

Put these in the dash of an 2006 Grand Cherokee best 31/2 out there for the price sound great and very clear

Boston Acoustics S35

Written By Benjamin, USA on Thursday, April 23, 2009

Crutchfield Customer Review (What's this?)

Great sounding speakers worth the money

Boston Acoustics S35

Written By bobby, fincastlle va on Saturday, March 28, 2009

Crutchfield Customer Review (What's this?)

Speakers make music sound live,,have great highs. very good speakers here

Great Sound

Written By Ralph, Southern California on Monday, March 02, 2009

Crutchfield Customer Review (What's this?)

I have a 2008 Dodge Ram 1500 with the 7 speaker Infinity system. I bought these for the dash. It took me 15 minutes to install both front speakers. The Crutchfield installation master sheet made the install very easy and quick. As far as sound goes, they made my highs sound crisp and clear. I can hear sounds in soungs I didn't know were there. All this with the stock head unit and system. I highly reccomend these speakers for the price and performance. My advisor Paul reccomended these and they didn't dissapoint. Thanks Crutchfield!!

Sound good

Written By Gary, Atlanta , GA on Monday, November 10, 2008

Crutchfield Customer Review (What's this?)

Purchased for a 95 Sabb to replace the factory speakers that were cracked. Easy to install and the new speakers sound great!

Boston Acoustics S35

Written By Dave, Fort lauderdale FL on Wednesday, October 08, 2008

Crutchfield Customer Review (What's this?)

I installed these into my saab 93 and they fit perfectly! They sound great and live up to the expectations that i was looking for. All around great product, easy to install, and have lows and highs that others cannot compare to.

They Fit in Saabs!

Written By Keith, New York on Monday, September 01, 2008

Crutchfield Customer Review (What's this?)

I installed these in my Saab 900SE dashboard about a week ago and I love them. They fit under the speaker grilles and don't touch.

These are my second Boston Acoustics. I put 4" ones in the dashboard of my old Saab and they sounded so good that when I bought a newer Saab I bought 3.5" ones for this dash . Just like the 4" ones they sound great. Nice and clear sound to fill in the mids that the larger speakers leave out. Highs are nice and not piercing. I put in bass blockers for the 3.5's. I did not have them on the 4's. I don't think they're 100% necessary, but they are a nice $10 insurance policy. They keep the speaker from trying to pound out bass and the sound seems to be a little more clear because of it. I did a side by side comparison with and without the bass blockers and they don't make a huge difference; but for loud volumes (i.e. driving windows down on the highway) they are worth it to protect your speakers I think.

Overall, great speakers by Boston Acoustics. I'm glad I purchased my second pair and I'd go back for a third pair if I needed to. 10 out of 10.

Great replacement for Saab 9-3

Written By TJ, Latrobe PA on Thursday, April 03, 2008

Crutchfield Customer Review (What's this?)

Although the fit guide says the BA S35 will not fit, it does! A call to a sales advisor showed that it is supposedly 1/100th of an inch too big. I and many other find this to be incorrect - fits just fine!
And it is a huge upgrade over the stock dash speakers in a 9-3 Saab - even the mid-tweeter Pioneer separates in the upgraded system. Much more clarity and "presence".
Too bad Crutchfield hasn't done any research on the installation for Saab's - you get very generic instructions. I might replace the hatch speakers as well if I can find out how to remove the panel without causing damage!

Great!

Written By Robert, St. Joseph, MI on Saturday, April 07, 2007

Crutchfield Customer Review (What's this?)

Purchased to put in the dash of my PT Cruiser. Very pleased with the sound quality and the overall quality of the speakers. Have everything under 100Hz filtered out and these perform beautifully. Excellent, clear highs, and good mid-range. They are a great value for the dollar and worth more. This is a very nice, high quality prodcut.

Speaker HasTotal Harmonic Distortion (THD) Problems

Written By Ozz, El Paso, TX on Wednesday, April 04, 2007

Crutchfield Customer Review (What's this?)

These were the first set of Bostons I've owned. I've been loyal to Polk and Infinity for many years now but after all the raving reviews I decided to give these a try.

I was sadly disapointed by the sound quality. Most vocals sound really good, and it is true that the highs are not ear pearcing. The problem lies at higher volumes. As volume increases, the woofer responds beautifully, while the tweeter responds at a slower rate. I tried raising the treble and decreasing the mid. This only worked at the lower volumes. I'm not into ear piercing highs, but I do demand that a speaker sound the same at all different volume levels. The bottom line is that the tweeter needs refining. Needless to say, I'm going back to Polk.

By the way, the speakers never distorted. They are realatively good speakers, but not on the same level as, say, Polk or Infinity.

Sound great, but didn't fit perfectly

Written By Garrett, New Orleans, LA on Saturday, January 06, 2007

Crutchfield Customer Review (What's this?)

I purchased these speakers for the front dash location on my '92 GMC pickup. They came with free 4x6 adapters so they would fit into the stock location. The sound great. They replaced a cheap pair of Pioneer 4x6 speakers and these Bostons are definitely a cut above. The base sounds good for such small speakers, and the high notes aren't so piercing as to be annoying. Like I said, they are much better than the Pioneer 4x6's that the Bostons replaced.

My only complaint was that they didn't fit perfectly into the stock location with the adapters. The sit just a tiny bit too high (about 1/4"). The speaker grilles still fit ok, but the tweeter touches them. It's not that big of deal, but it's a little annoying, although certainly not bad enough to send them back. They just sound too good to send them back over speaker grilles that appear to be just a little bowed. My wife didn't notice, but it still gets to me a little bit.

The speakers I chose

Written By Emron, Blythe, CA - Long Beach, CA on Friday, July 14, 2006

Crutchfield Customer Review (What's this?)

I gave these speakers 5 stars simply because they sound amazingly. They're in my '81 Chevy Pickup, and they're used as In-Dash speakers. They're powered by the Audiobahn A4004V amp (4x50). The Boston Accoustics' RMS is 30 watts, so I had to turn the gain of the amp down a bit, just to be safe. After reading these reviews, before making my purchase, I decided to buy the bass blockers, and I did. I haven't tested the sound with the bass blockers connected and then not connected, but I have heard them with the bass blockers connected. The vocals are crystal clear at full volume, which is something I wasn't used to. Before hooking these up, I had a pair of JBL 3.5" dash speakers ran from my head unit, and they didn't give off a very clear sound.

The only problem I had with these speakers is that they don't fit under my dashboard very well. I installed them, and I put my dashboard back on, but now there are bulges in the dashboard, above where the 3.5" speakers are. It's a sad story, but I'm going to keep them there, and I hope they don't break because they sound perfectly fine, even with the weight of my dashboard slamming on them.

-Emron

Excellent Upgrade!

Written By Victor, Farmingdale, NY on Friday, June 16, 2006

I just installed these in my 94 Cavalier, and what a difference they make over stock! At first I paired them with my aftermarket head unit, an Alpine 9851. This combo was not satisfactory; at higher volumes(loud enough to hear over the wind noise at 60 mph), there was tons of distortion. This is the reason i only give these speakers 4 stars. Paired with my new Alpine T220 2 channel amp(2x70 RMS @ 4 ohms) and 600hz bass blockers, however, these speakers are sonic gold! If you have an amp to power them, or are planning to get one, these are the speakers for you!

These are the ticket.

Written By Matthew, St. Louis, MO on Thursday, March 23, 2006

Crutchfield Customer Review (What's this?)

For anyone who's drawn to replace his or her dash speakers with the comparably priced Infinity Reference offering, let it be be known that I just put a month-old pair of them out to the curb. Don't let anything you read about the other sizes in that model sway your opinion on the 3.5s: if you want a good pair of voice speakers, that won't slash through every 's' and pierce your brain with every high hat, get the Bostons. The Ref 3.5s have a harsh little tweeters that open the floodgates on high-pitched sounds; the Bostons, I've just discovered, manage them much more agreeably and clearly.
Pair them with 600hz bass blockers, and you'll be able to crank them nice and loud.

Get everything you’ll need to enjoy your new Boston Acoustics S35

Reduce ambient road noise and your vehicle's "rattles," for better sound inside your car.
You may need speaker wire to connect your speakers to your amp or receiver.
Keep your speakers clean and dry. They compress to fit behind your speakers.
The right tools will help keep your installation simple and clean.
If your stereo doesn't cut the deep bass from your full-range speakers, a set of bass blockers can help prevent distortion and give you cleaner bass too.
Dynamat 10415 Xtreme Speaker Kit

Dynamat 10415 Xtreme Speaker Kit

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Dynamat 10435 Xtreme Door Kit

Dynamat 10435 Xtreme Door Kit

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Dynamat SuperLite Tri-Pak

Dynamat SuperLite Tri-Pak

Triple package — 3 sheets, 12 square feet (Model #10612)

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T-Spec 16-gauge Speaker Wire

T-Spec 16-gauge Speaker Wire

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Stinger PRO Series Speaker Wire

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T-Spec 12-gauge Speaker Wire

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Item #: 120SW12WB1

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XTC 3-1/2

XTC 3-1/2" Speaker Baffles

Protect your speakers (3-1/4" depth)

Item #: 237XT30

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Metra Crimp Tool and Connectors

Metra Crimp Tool and Connectors

Package contains crimp tool and over 150 pieces

Item #: 120CRIMPKT

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S&G Tool Aid 87615

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S&G Wire Cutter/Stripper Tool

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Cuts and strips 12- to 22-gauge wire

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S&G Tool Aid 87650

S&G Tool Aid 87650

Door Trim and Panel Removal Tool

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Bojo Trim Panel Tools

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Set of 6 pry tools — helps remove interior and exterior trim and door panels

Item #: 126CR6NGL

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Spec Tools SQR-200a Squeeze Wrench

Spec Tools SQR-200a Squeeze Wrench

Narrow space ratchet kit with 18 sockets

Item #: 180SQR200A

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Skewdriver Pro SPK4042

Skewdriver Pro SPK4042

Ratcheting straight and offset screwdriver set with 40 bits (Skewdriver Pro with ratchet handle, pictured)

Item #: 180SPK4042

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Install Bay 3320

Install Bay 3320

Auto-ranging digital multimeter

Item #: 1203320

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Install Bay IB35400

Install Bay IB35400

Premium door panel and trim tool

Item #: 12035400

$15.99
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Bojo Trim Panel Tools

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Set of 6 pry tools — helps remove interior and exterior trim and door panels

Item #: 126CR6LNGL

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Bass Blockers

Bass Blockers

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Item #: 127BB800A2

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