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Boston Acoustics S45

4" 2-way S-Series Coaxial Car Speakers

Discontinued
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This item has been discontinued

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Boston Acoustics SE45

OUR PRICE: $64.95

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Boston Acoustics S45

4" 2-way S-Series Coaxial Car Speakers

$59.95

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NVX 25 ft. of True Spec 16 Gauge Speaker Wire

100% OFC wire with a noise eliminating twisted-pair technology to provide crystal clear sound.

$15.99

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Car Stereo and Speaker Installation Tool Kit

Includes Test Light, Crimp/Splice Tool, Multi-bit Screwdriver and more.

$18.99

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NVX SDSK2 Speaker Kit

Eliminates speaker panel distortion and reduces vibration, rattles, and squeaks!

$12.99

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Perfect Replacement Solution

Great sound off a low powered system is certainly achievable with the new Boston Acoustics S-Series speakers. These speakers will produce the real tones of your music as the artist originally intended. They offer a warm natural sound with the ability to really get loud. With the built-in crossover, you will hear a rich blend of music between the woofer and the tweeter, and a smooth high and low frequency roll-off. These 35 watt RMS speakers will run great off your factory or aftermarket stereo without the need for an external amplifier. These puppies are the perfect replacement for your stock door speakers!

  • 4" S-Series 2-Way Car Speakers
  • Power Handling:
    • Peak: 160 watts per set / 80 watts each side
    • RMS: 70 watts per set / 35 watts each side
  • Copolymer cone woofer
  • Butyl rubber surround
  • Neodymium tweeter magnet
  • Type S3 3/4" Soft dome tweeter
  • 4 ohms impedance
  • Integrated crossover
  • Authorized Internet Dealer
  • 1-year Manufacturer's warranty

Priced Per Pair

Product History:

Boston Acoustics SE45 thumbnail
(newest, current model)
Boston Acoustics S45 thumbnail
(previous model, replaced by Boston Acoustics SE45)

Speaker Specifications

Series
This is the manufacturer product line of speakers.
Priced Per
Car Speakers are typically sold in pairs so you will receive 2 speakers for each speaker purchase on speakers marked "Priced Per Pair". If a speaker is marked "Priced Per Each" then the speaker is sold individually and each purchase you make will result in 1 speaker. High-powered tweeters, midrange and full-range pro audio for car speakers are typically sold per each speaker.
Speaker Size
Refers to the size of the speaker measured in inches. Every vehicle has standard application sizes. Please use our vehicle fitment guide for your vehicle's specific speaker sizes if you do not know them.
4"
Design
The number of individual drivers in a car speaker. Speakers with 2 drivers are known as a 2-way, and 3 drivers are known as a 3-way. Component systems are often referred to as "separates" because the tweeter is not attached to the midwoofer (main speaker driver) and mounts separately in a location such as a door post. Component systems typically come with an external crossover so you can easily adjust the high and low frequencies sent to both the midwoofer and the tweeter. Center channel speakers are great for those looking to have surround sound in their vehicle.
2-way
Tweeter Design
Designs such as cone, dome, semi-dome, balanced dome, and whizzer are most popular. Cone tweeters are simple, efficient and typically are the most reasonably priced. Dome tweeters are used in most home speakers, and provide a smoother and more accurate sound. Semi-dome design is one with a dome placed inside a cone. A Balanced dome driver is a semi-dome with equal reproduction area given the cone and dome portions of the driver. A whizzer tweeter is a separate tweeter cone driven by the voice coil of the woofer.
Dome
Tweeter Size
Refers to the size of the tweeter. Typically, smaller tweeters produces less output with higher frequency response.
Woofer Composition
Lightweight woofer cone materials are essential for efficient operation. Poly cones produce exceptional sound and are sturdy against various changes in temperature. Paper cones are very efficient, and when treated for moisture resistance, will perform at a high level. Poly refers to polypropylene, which is thermoplastic or fibers that are polymers of propylene. IMPP refers to injection molded polypropylene, a commonly used process and material in speakers.
Copolymer
Woofer Surround
A speakers surround is part of the suspension system. The surround protects the cone and prevents it from being displaced as it flexes out from the basket. It is usually made of a durable material like treated foam or rubber in order to withstand the strenuous job of producing bass frequencies.
Butyl Rubber
Peak Power Handling
Peak power handling refers to the amount of power a speaker can handle during a brief musical burst. The RMS power range figure is a much more reliable rating for determining the speaker's power requirements. The Peak power handling specification is typically rated per speaker unless otherwise noted.
80 watts
RMS Power Handling
The RMS power is the amount of power the speaker requires to operate safely and properly. RMS Power Handling refers to the amount of power a speaker can handle on a continuous basis. We recommend powering your speakers or subwoofer with 80%-120% of its recommended RMS rating. The RMS power handling specification is typically rated per speaker unless otherwise noted.
35 watts
Sensitivity
An efficiency or sensitivity rating tells you how effectively a speaker converts power into sound. The higher the number, the more efficient the speaker and the louder it will play with the same input power. An efficient speaker helps you maximize your available power. Most sensitivity ratings measure the speaker's output with 1 watt of input, 1 meter from the speaker. Some speakers' sensitivity is measured with 2.83 volts of input, instead of 1 watt.
 
Efficiency (1w/1m) is not an accurate indicator of a subwoofer's output capability and should not be used as a comparison to other speakers or subwoofers to determine which one is "louder".
92 dB
Frequency Response
The range of frequencies the speaker will reproduce (lowest frequency to the highest). Bigger is better, meaning the wider the range, the better. The optimal range is 20 - 20,000 Hz (which is the range of human hearing).
90 - 20000 Hz
Impedance (Per Voice Coil)
The load value (in ohms) that the speakers present to the amplifier per voice coil - the amount of resistance to the current flow. This is a key specification as subs wired in parallel or low impedances can create problems with your amplifier and potentially void all warranties. We encourage you to ask our support department prior to purchase if you do not understand which impedance level will suit your application best.
4 ohms
Shallow Mount Installation
This means that the subwoofer/speaker is designed to be installed in areas that do not have a lot of space. Shallow mount subwoofers are typically found under a seat or behind the seat in some trucks.

Shallow mount speakers will typically have a mounting depth of 2" or less, while shallow mount subwoofers will typically have a mounting depth of 3" or less.

No
Top-Mount Depth
The depth when installed on top of the mounting surface. Measured from the bottom of the speaker's magnet to the bottom of the mounting holes on the rim of the speaker.
2-1/16"
Cutout Dimensions
Refers to the dimensions of the hole, measured in inches, required to contain the speaker.
Cutout Dimensions
Refers to the dimensions of the hole, measured in inches or millimeters, required to contain the speaker.
3-3/4" x 3-3/4" 
Hi-Res Audio Compatible
This feature refers to if the product is capable of Hi-Res Audio (HRA) playback.
Speaker Grilles
A grating or screen of metal or plastic bars or wires, mounted in front of a speaker as protection. If yes, the speakers will include matching speaker grilles. If no, there are no grilles included.
No
Number of Speakers
This is the number of speaker that is included in the package. Each purchase will result in receiving the number of speakers indicated here. Please note that some items will have multiple woofers in the same enclosure. For sets of component speakers, this number will refer to the number of sets of speakers (For example, 2 would indicate the purchase includes 2 woofers and 2 tweeters).

Please refer to the product image and description for further details about the speaker.

Specials with this Item

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Warranty and Return Policy

Parts Warranty Duration
1 year
Labor Warranty Duration
1 year
Warranty Provider
Manufacturer

Summary of Customer Ratings & Reviews

Rating Distribution

5 Star
90%
4 Star
10%
3 Star
0%
2 Star
0%
1 Star
0%

Average Attribution Rating

Durability
4.8
Value
4.8
Features
4.7
Design
4.7
Usability
4.8
Justin

Sacramento, CA

Overall
Durability
Value
Features
Design
Usability
Amazing

March 25, 2011

These were the best sounding 4" speakers I've ever heard. I've tried out all sorts of 4" speakers in my car and hands down, the best. I could no longer keep them installed due to the depth being over 2".

8 of 9 found this helpful

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John

Lynn Haven, FL

Overall
Durability
Value
Features
Design
Usability
Great product from a true Audiophile brand

January 4, 2008

Unlike many of the brands producing car speakers these days (i.e. "Boss" and others), Boston Acoustics is a trusted and excellent manufacturer of all types of audio products; their name and quality will be familiar with anyone in the professional audio or production industry. These speakers, despite their small size, produce faithful sound across the full range. They are excellent rear or tower speakers for SUVs and vans (4" speakers are rare in smaller cars) and compliment fill-range front speakers (3- or 4-ways, or component systems with tweeter/woofer combos. They also have remarkably high attenuation (called sensitivity), meaning that they produce more volume than usual at any given power level; this results in better low-volume performance as well as higher volume potential. Although their rated wattage is fairly low (they are small speakers), this sensitivity makes up for it, and then some. Physically, they have a fairly shallow (for 4-inchers) basket size, meaning they should fit in any vehicle with 4" stocks...these are maybe 5mm longer than my stocks, and fit easily in their positions. Highly recommended, especially for 40 bucks.

7 of 8 found this helpful

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MG

Columbus, OH

Overall
Durability
Value
Features
Design
Usability
Good Quality

November 24, 2010

I installed these in a 1983 Mercedes 380SL. The speakers have a low enough profile that the OEM grills for the car will fit over them after install. This an issue on the 70-80's Mercedes SL series. Using only these 2 speakers (as the car has to be modified to add more) the sound is good considering. All in all they are good speakers for the price and the form factor is a big plus...

6 of 7 found this helpful

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Phil

McHenry, IL

Overall
Durability
Value
Features
Design
Usability
Great Sound

July 9, 2005

These speakers are great for anyone who needs to put a lot of sound with a little room. The tweeters on these speakers is awesome, and it is a great set of speakers for their price, boston company for speakers, and at this price, how can you go wrong?

6 of 7 found this helpful

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M. Conner

Fort Wayne, IN

Overall
Durability
Value
Features
Design
Usability
Impressive Sound!

April 10, 2011

These little 4" speakers surprised me with how loud they are. I originally had an old pair of Kenwood eXcelon 4 inchers installed in the dash of my '92 Mercedes 190E but after filling the rest of the car with Boston Acoustics (SX50s, SL60s, SX55s, and 2 8" Rally Series Subs) I figured I might as well finish off with these. They dropped right in to the factory holes, and the tweeters were low enough that the factory covers easily fit over them. They were so much louder than the Kenwoods that I had to readjust the balance on my head unit to get the sound centered again. Great quality, for a great price!! Highly recommended!

4 of 5 found this helpful

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David

Sterling, VA

Overall
Durability
Value
Features
Design
Usability
Great Speakers

January 12, 2010

I purchased these speakers to replace the OEM speakers. I am very pleased with the quality and sound from the Boston Acoustics 45 speakers. They were easy to install.

4 of 5 found this helpful

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Keith

Atlanta, GA

Overall
Durability
Value
Features
Design
Usability
Great Small Speakers

January 23, 2006

If you don't have much room for speakers these are the ones to choose. They complete my 7 speaker system quite nicely (Components, 6X9s, 10 inch sub, and these 4s). Good quality, look nice, and inexpensive.

4 of 5 found this helpful

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Allen

Ypsilanti, MI

Overall
Durability
Value
Features
Design
Usability
Good speaker for the price.

November 10, 2005

I would have to say Boston Acoustics is up there in the audio community. They have been around for a good amount of time, and any true audiophile knows BA. These little 4" speakers from boston produce some GREAT sound. For $60.00 you cannot go wrong. The quality of the speakers and design is grade A top notch. Buyers, if you buy this product I guarantee you will be happy with it.

5 of 7 found this helpful

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Leo

Richmond Hill, GA

Overall
Durability
Value
Features
Design
Usability
good product

May 8, 2011

I have these in my dash and would recommend putting them in enclosures to get the full effect of these. great speakers though, they handle the head unit's 20 watts RMS no problem. I will be adding an amp for these soon, as well as an additional set of 6x8 speakers run by the same amp to fill out the sound.
I recommend these speakers..

3 of 4 found this helpful

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stan

huntsville, al.

Overall
Durability
Value
Features
Design
Usability
the best

December 13, 2009

i love theses Speakers. i bought 6 of them for my 1990 jag xj6. these speakers are tight and punchy, and very clear . the bass is nice too.

4 of 6 found this helpful

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Accessory Tools and Products

Accessories added

NVX 25 ft. of True Spec 16 Gauge Speaker Wire

100% OFC wire with a noise eliminating twisted-pair technology to provide crystal clear sound.

Your Price $15.99

Streetwires 50 ft. of True Spec 16 Gauge Speaker Wire

You need speaker wire to connect your speakers!

Your Price $29.99

Belva 23 ft. of True Spec 16 Gauge Speaker Wire

100% Copper Clad Aluminum, PVC blended jacket for easy installation and high strand count for maximum audio quality

Your Price $12.99

Car Stereo and Speaker Installation Tool Kit

Includes Test Light, Crimp/Splice Tool, Multi-bit Screwdriver and more.

Your Price $18.99

NVX XTGSP2 Tone Generator and Speaker Polarity Tester

Perfect for safely troubleshooting and testing audio systems

Your Price $29.99

Universal Wire Puller & Grabber

Running wires has never been easier! This wire puller allows you to run wires through those hard to reach places!

Your Price $7.99

Encore Universal Four Door Power Door Lock Kit

Add Power Door Locking and Unlocking while you have the Door Panels removed

Your Price $29.99

NVX SDSK2 Speaker Kit

Eliminates speaker panel distortion and reduces vibration, rattles, and squeaks!

Your Price $12.99

NVX Sound Dampening Rubber Roller

Install your Sound Dampening with ease using this heavy duty rubber roller!

Your Price $7.99

4" x 6" to 4" Speaker Adapters

Perfect fit for 4" speakers!

Your Price $6.99

XTC 4" Round Foam Speaker Baffles

Creates a tight, acoustic seal behind the speaker to enhance the sound quality.

Your Price $7.24

16-14 AWG Butt Connectors

These blue butt connectors are ideal when connecting thicker speaker wire your new aftermarket speakers!

Your Price $4.49

16-14 AWG Blue T-Tap Adapters

Allows for fast and easy splicing of wires by easily tapping into the cable.

Your Price $4.99

16-14 AWG Quick Disconnect Connectors

These blue quick disconnect connectors make it easy to connect and disconnect speaker wire your to your new aftermarket speakers!

Your Price $13.26

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Product Summary

Manufacturer

Model Number

S45

UPC

690283357221

Weight

2.00lbs

Internal SKU

s45

Internal Product ID

5018

Sonic Electronix Wiring Guide

Wiring Diagram Legend

Warning: The image depicted shows the resistance change when wiring multiple subwoofer terminals. Please refer to your subwoofer's owner's manual for the proper wiring of its terminals. Sonic Electronix, Inc. is not responsible for damage caused to your audio system or vehicle due to improper installation. Please call tech support at 1-877-289-7664 if you require additional assistance.

Product Name: Boston Acoustics S45