Boston Acoustics SC55

5-1/4" 2-way car speakers

  • Boston Acoustics SC55


  • Boston Acoustics SC55


  • Boston Acoustics SC55

  • Boston Acoustics SC55

  • Boston Acoustics SC55


Item #: 065SC55

Review Summary

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Our take on the Boston Acoustics SC55

by Buck Pomerantz
Boston Acoustics

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.

Boston Acoustics SC Series speakers bring brilliant sound to your vehicle's audio system. Their precision construction and sensitive response allow them to deliver superb performance, filling your car with perfectly balanced sound and making your drive much more pleasurable.

The Boston Acoustics SC55 5-1/4" speaker features a tough copolymer 5-1/4" woofer that really delivers the beat. A butyl rubber surround keeps the cone under tight control for clear sound and reliable operation even at extreme playback levels. The 3/4" Kortec® dome tweeter sits in a contoured baffle that widens the dispersion of your high notes, providing clean, well-balanced instrumental detail throughout your car.

Read more

A built-in crossover makes sure the highs and lows combine smoothly, and protects the tweeter from sudden overloads. The compact neodymium magnet helps reduce the size of the SC Series speaker, so it can fit in more vehicles without any loss of fidelity.

Note: The oversized terminals on these speakers won't connect to a Crutchfield wiring harness. We recommend that you buy a 10-pack of female quick slides that you can splice onto our harness.


  • 5-1/4" 2-way speakers (pair)
  • copolymer woofer cone with butyl rubber surround
  • 3/4" Type-S2 Kortec dome tweeter
  • compact neodymium magnet for shallower mounting depth
  • power range: 2-50 watts RMS (150 watts peak power)
  • frequency response: 60-20,000 Hz
  • sensitivity: 90 dB
  • top-mount depth: 2-3/16"
  • warranty: 2 years
  • Our 60-day money-back guarantee

Priced per pair

Hands-on research from the Crutchfield Labs (what are the Labs?)

Features and Specs
Design 2-way
Tweeter Design 3/4" Dome
Tweeter Composition Kortec
Woofer Composition Copolymer
Woofer Surround Butyl Rubber
Parts Warranty 2 Years
Labor Warranty 2 Years
Sensitivity 90 dB at 1 watt
Frequency Response 60 - 20k Hz
RMS Power Range (Watts) 2-50
Peak Power Handling (Watts) 150
Impedance (Ohms) 4
Top-mount Depth (Inches) 2 3/16
Bottom-mount Depth (Inches) N/A
Cutout Diameter or Length (inches) 4 9/16
Product Research
What's in the box?

Download owner's manual

  • Two 2-way speakers
  • 2 Grilles
  • 2 Grille rings
  • 2 Adhesive backed foam gaskets
  • Two 8" Lengths of speaker wire (each has quick-slides on one end and bare wire on the other)
  • Eight 1" Self tapping screws
  • 8 Speed clips
  • 4 Butt connectors
  • Specification sheet
  • Warranty information
  • Product registration card

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.


Tweeter: Each speaker uses a type-S2, 3/4" Kortec dome tweeter. Kortec is a silky fabric saturated on the underside with a proprietary stiffening agent. Because the inside surface of the dome is ultra stiff, the tweeter tracks the signal with ease and produces an excellent transient attack. Simultaneously, the soft, self-dampening top layer eliminates unwanted resonance, so the sound is smooth and articulate. The Contoured Asymmetrical Tweeter Baffle (CATB) delivers smooth extension and strong on-axis and off-axis response.

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

Crossover: All SC series speakers feature specifically tuned crossovers to deliver the best blend between the tweeter and woofer. Each also features tweeter protection for optimal performance and reliability.

Voice Coil: The oversized 1-1/2" voice coil increases overall power handling and reliability.

Installation: The compact size of the magnet allows SC series speakers to fit where other high quality speakers don't. Neodymium magnets offer extraordinary power-to-weight ratio, approximately ten times the magnetic strength of a conventional iron-ferrite magnet of equal size.

Speaker Terminals: These speakers have 0.25" positive (+) terminals and 0.187" negative (-) terminals, which are too large for the vehicle-specific speaker harnesses supplied by Crutchfield for many vehicle applications. It is recommended that a pack of assorted female quick slides (item # 263FQS10PK) be purchased and spliced to the harnesses to adapt them to the speaker terminals.

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Boston Acoustics SC55 Reviews

Average Customer Review:

7 people say:

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4 out of 5

Very good speakers

Written By Mtnblue222, Washington, DC on Sunday, December 09, 2012
Crutchfield Customer Review (What's this?)
These speakers have been a great replacement for the original speakers in my car. They produce a crisp sound with a strong mid-range. I have separate tweeters in the door. I am happy with this purchase.
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5 out of 5

Boston Acoustics SC55

Written By MonteCarlo31, Houston, TX on Tuesday, December 04, 2012
Crutchfield Customer Review (What's this?)
Quality speakers however might be too much for a stock headunit to handle.
Great highs. Good middle.
Make sure you have a sub in your vehicle if using these. Great middle and high notes, no low available.
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2 out of 5

Disappointed - Not for Honda CR-V

Written By RayR, New Hampshire on Friday, November 23, 2012
Crutchfield Customer Review (What's this?)
I bought these for my wife's Honda CR-V, after her rear door speakers stopped working. They look like great speakers. The mounting bracket that ships with them fits in the door and has screw holes in the right places, but is sized for larger speakers. There is a half inch ring of airspace around the outside between the bracket and the speaker. The lack of a solid baffle in this installation completely kills the bass response. I called customer support, and they said that's the way they are, and I could fabricate a custom baffle if I wanted. Unfortunately, I don't have the jigsaw or the patience to take the car doors apart again, at least not today. Basically, I spent this much and 5 hours, and they sound worse than the factory speakers.
These speakers might be great - I don't really know what they sound like when installed in the proper enclosure.
The problem is not with the speakers themselves, it's with the mounting kit that they come with. Should not be recommended for Honda CR-V
2 out of 3 people found this helpful
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4 out of 5

Great sounding

Written By jer, Counce,TN on Wednesday, November 14, 2012
Crutchfield Customer Review (What's this?)
Great replacement for factory s
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5 out of 5

Boston AcousticsSC55

Written By Bob, St Louis, MO on Sunday, June 03, 2012
Crutchfield Customer Review (What's this?)
Good sound for a small speaker. Used in Rear door of a Honda Fit. Front speakers do most of the "work" anyway, front is Focal Polyglass VR 30 powered by a 4 X 50 Sony amp. The Focals are sweeeeet. These SC55s didn't fit the rear doors, using the provided adapter, because the stock speaker grill is concave, which caused the grill to contact the tweeter assembly before the door panel was completely snapped in place. Had to make my own adapter. Not a big deal............sounded good after a bit of creative engineering.

Good highs, OK mid bass. No bass, but didn't expect any from a 5 1/4" speaker. (bass is the job of my 10" Kappa Perfect) Nice sound for the $109 sale price.
None except the fit issue.
1 out of 1 people found this helpful
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5 out of 5

Excellent sounding speakers!

Written By PaulM, Cary, NC on Sunday, May 08, 2011
Crutchfield Customer Review (What's this?)
I installed these speakers in the doors of my 1987 Porsche 911 to replace some old tired paper units. What a difference! The quality of the sound is great: crisp highs and excellent mid range; bass is decent considering these are only 5 1/4. These speakers can handle a lot of volume and not lose their composure - I'm not running an amp, just the head unit, so the efficiency of these SC55s is great. I would highly recommend these speakers.
3 out of 3 people found this helpful
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4 out of 5

Great sound, light, but tight Bass

Written By Paul, Vermont on Wednesday, October 27, 2010
Crutchfield Customer Review (What's this?)
Installed these in my '08 Civic. Also have the larger SC 65 in my front doors. Great sounding speakers! I have had several pairs of Boston's in the past and the detail in these is quite impressive. You will here things in music you have never heard before -even on high end equipment. The "mids" and "highs" are excellent. The Bass however while very solid and tight is a bit lacking in volume. I'm only using a stock receiver, so maybe more power would help. Crutchfield was helpful, but the speaker brackets they included for my rear deck were not really great; there were large gaps and airholes. I just didn't like the brackets so I made my own out of MDF board. I traced the outlines of the stock speakers (weird shape) and cut the outline out and painted it black. Looks professional, and provides a solid base for the speakers.
5 out of 5 people found this helpful
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Add accessories for the Boston Acoustics SC55

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Spec Tools SQR-200a Squeeze Wrench Narrow space ratchet kit with 18 sockets
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For a more in-depth review and enhanced detailed information on the Boston Acoustics SC55, please visit the Crutchfield website product page (/ISEO-rccbcspd/p_065SC55/Boston-Acoustics-SC55.html ).