Boss 638BCK Single DIN Bluetooth Car Stereo w/ Front USB + Speakers

Boss 638BCK

Single DIN Bluetooth In-Dash Digital Media AM/FM Car Stereo w/ Front USB, SD Reader, 3.5mm Auxiliary Inputs + 6-1/2" Speakers

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List price $99.99

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$49.99

with warranty

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Order within 40 hrs 46 mins to ship 12/16

Arrives by Wednesday, Dec. 18 to zip 23465

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Boss Audio Store

Product Details:

  • In-Dash Digital Media, AM/FM, MP3, USB Receiver with Remote
  • Power Handling:

    • Peak: 250 watts
    • RMS: 180 watts
  • Built-in Bluetooth for hands-free and audio streaming
  • Blue illuminated button lighting
  • CD text information display
  • MP3 ID3 Tag Display (Title/Artist/Album)
  • Authorized Platinum Internet Dealer
  • 1 year Sonic Electronix, and 2 years Manufacturer's warranty

Playback and Audio Features:

  • AM/FM tuner with 18FM/12AM presets
  • Electronic Shock Protection (ESP)
  • 5 selectable tone curves
  • 8GB SD Card reader for (audio and video) playback

Expandability Options:

  • 2 Sets of 2V preamp outputs (front, rear and subwoofer)
  • Front Auxiliary Input: 3.5mm headphone jack allows connection to portable media devices such as MP3 players
  • Front USB Input: USB port allows connection to digital devices such as flash drives, portable media players, etc.

In-Dash Receiver Specifications

Receiver Size

Single DIN: 1 DIN dimensions will work with all single DIN installation kits we have to offer. Single DIN radios are the most common size for after-market stereos.

Single DIN slot with flip-out screen: The DIN stereo includes a retractable, flip-out screen. Before purchasing, make measurements to be sure there is no interference with dash accessories such as A/C vents or shift levers.

Single DIN slot with a larger face: Standard single DIN size, but the display is larger then the standard single DIN size. Due to the nature of the larger face, problems may arise when installing in particular vehicles. These stereos are great for single DIN slots where you want a larger screen.

1.5 DIN: This size is very uncommon in vehicles, however this size opening is most commonly found in Chrysler and Chevrolet vehicles.

Double DIN: Approximately 4-inches in height, this size is becoming more common every year. Prior to 2000, this size was typically only found in Japanese vehicles such as those made by Honda or Toyota. Now, it is becoming more popular for many vehicles to be fit with a Double DIN opening.

Single DIN
Anti-Theft Security

Detachable / Removable faceplate security: The most common anti-theft feature. It allows you to take the faceplate with you, thus disallowing operation, which deters theft.

Security Codes: Mainly a feature in high end video units which do not have a detachable face / screen. Once the unit is uninstalled (or stolen), a security code (or PIN) is required upon reinstallation. Though you no longer have your unit after the theft, the thief also does not have your security code, which makes the unit useless. The hope is the thief knows which units have security codes and he/she chooses not to steal your unit because of the security code.

Ghost technology: This is not commonly used, but can be found primarily in a select number of 2004-2005 head units. It creates an illusion that no unit is installed by appearing completely black when turned off. Potential thieves may steer clear because it appears as though no head unit is installed.

Anti-theft covers: Similar to ghost and hiding faces because they only create an illusion that the face/unit is not in place.

ESN: Stands for Electronic Serial Number. Allows the disabling of the radio and allows tracking if it is stolen.

Detachable Controls
Motorized Faceplate
Some in-dash car stereos feature a motorized faceplate that moves to expose a CD or DVD slot. This is a convenient feature that allows the front display to be larger and easier to read. The positioning of the monitor gives you control over the angle you would like to view information on the stereo.
No
Peak Power Output
This form of power rating refers to the maximum amount of power an electronic device can handle or output in an instant without damage occurring. Often times this maximum is achieved during a brief musical burst, such as a drum accent, or low bass hit.

Some manufacturers display peak power ratings on the face of their products to increase the appeal to consumers. The RMS power rating is more accurate, and we recommend using it for product comparison.

50 watts x 4 channels
Preamp RCA Outputs
RCA outputs, commonly known as preamp outputs, allow you to connect one or sometimes multiple external amplifiers. An in-dash receiver will commonly have one, two or three sets of RCA outputs that can be used to connect external amplifiers and other components. One pair of RCA outputs will typically provide a full range signal that can be used for most subwoofer or speaker amplifiers. Two pairs of RCA outputs can typically be configured as four full range signals, or also as two full range and two subwoofer signals. Three sets of RCA outputs will almost always produce four speaker signals and two subwoofer signals for use with multiple amplifiers.
2 Pairs (Front and Rear)
Dedicated Subwoofer Preamp RCA Output
A dedicated output that has a built-in low-pass crossover for specific connection to a subwoofer amplifier that powers a low frequency driver, typically a subwoofer.
No
Preamp Voltage
The preamp output rating is measured in volts (V). The higher the rating, the stronger the signal. This results in less unwanted noise being picked up.
2 volts
Display Type
The type of display on your receiver refers to the monitor that is used to display the source information such as song names, radio stations, or track times.

Dot-Matrix Text Display: A simple display which uses dots in specific illuminated color(s) to light up and form letters or numbers that are displayed on the receiver.

Graphic or Motion Display: Typically found in mid to high-end receivers and give your text information and receiver more life by adding motion, backgrounds, or multiple colors to your display. There are types of graphic displays such as 3D Graphic, Motion, and OEL (Organic Electroluminescent) displays. They can range from one color to full color displays and typically allow you to select from one of many built-in animations, background images, screensavers or other graphics to enhance your experience and add an extra bit of personality to your system. Some units also come with software that allow you to load your own customizable pictures or animations.

LCD Monitor Display: Can be as small as 2" or as large as 10". Some LCD displays are motorized for angle adjustment. LCD monitors display full motion video playback as well as your standard text such as track status, radio station information and more depending on the receiver's features.

Dot-Matrix Text Display
Display Color
The display color refers to the color of the text and or graphics on the receiver.

Multi-Color: When more than one color is on the display, for example one part of the text is white, while the other part is blue.

Variable-Color: The display colors can be changed by the user. If the default color of text/display is blue for example, the user can change the settings to where the color turns to red. Variable color displays are typically described in detail in the item's description.

TFT-LCD Display: In-dash receivers with a video screen that display multiple colors and often times video such as DVD, navigation or other video sources.

Light Blue
CEA-2006 Compliant
Amplifiers that have been tested to meet specific standards. When a car amplifier meets these standards, you can be sure that it will be able to produce the amount of power specified by the official CEA-2006 rating. Usually, these rating consist of the following items:
  • RMS Power
  • Signal-to-Noise Ratio

This rating applies to both external car amplifiers, as well as the amplifiers inside of in-dash stereos.

No

Playback Features

AM/FM Tuner
Most in-dash CD players have AM/FM playback allowing you listen to your favorite local radio stations.
Yes
FM Presets
The number of FM radio stations that can be stored as presets.
18
AM Presets
The number of AM radio stations that can be stored as presets.
12
CD-R/RW Playback
This feature refers to whether or not the CD player will play finalized CD-R discs and/or CD-RW discs.
No
MP3 Playback
This feature refers to whether or not the CD player will play discs encoded with MP3 files. To burn a MP3 encoded disc, use the "data" mode on your CD Recorder and finalize the session and/or CD.
Yes
WMA Playback
This feature refers to whether or not the CD player will play discs encoded with WMA files. To burn a WMA encoded disc, use the "data" mode on your CD Recorder and finalize the session and/or CD.
Yes
DVD / Video Playback
This feature refers to whether or not the receiver will play DVD (or other listed) video disc formats. Unless otherwise noted, the unit is not guaranteed to play recorded DVDs.
No

Monitor Screen Features

Monitor Screen Size
This is the size of the monitor on the unit. It is measured diagonally and in inches. The bigger the number the larger the screen.

Expandability Features

Additional Audio/Video Inputs
These inputs enable the unit to receive an audio or video signal from a separate source. There are many different types of connections and ways to accomplish this. Most common are RCA Composite cables and 3.5mm mini-jack plugs.

RCA Composite Inputs
These are your typical red, white, and yellow RCA composite cables that are common among devices with audio and video inputs. The red and white cables are dedicated for audio. The red cable is for the right channel and the white is for the left channel. The yellow cable is specifically for the video signal. Because this type of auxiliary cable contains 2 channels of audio, it will support stereo sound.

3.5mm
This is commonly referred to as a mini-jack or a headphone jack. It is a 3.5mm plug that transfers audio only. There is a right and left audio channel on the plug which allows for stereo sound playback.

3.5mm AV Input
These plugs look similar to the common 3.5mm mini-jack, however they carry a third channel dedicated for video.

Optional
This means that an auxiliary input is possible, but only with the use of an optional accessory. These optional adapters will sometimes use the CD Changer port or other port on the back of a unit that might restrict the use of other expandability features. These accessories are typically sold separately.

Front 3.5mm Audio Input
USB Input
This feature refers to whether or not the receiver features an input to connect a USB device via standard USB or mini-USB. The USB input may be a connection on the front or rear of the unit with an extension cable for connecting devices to the receiver. Some units have an optional input that allows for a USB adapter to be purchased separately and used with the unit.
Front and Rear

iPod Information

iPhone Compatible
This means that the unit is fully compatible with the iPhone. Please check the product description for up-to-date information on specific iPhone compatibility.

Speaker Specifications

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.
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.
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.

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.
Tweeter Composition
Materials such as polypropylene, silk, cloth, and paper are the most common, where as many more recent tweeters are now manufactured with composites such as Aluminum, Titanium, Mylar, and other materials.

PEI is an acronym for "Polyetherimide" which is an amorphous, amber transparent, high-performance thermoplastic.

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.
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.
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.
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.
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".
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).
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.
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.
Bottom-Mount Depth
The depth when installed from the bottom of the mounting surface. Measured from the bottom of the speaker's magnet to the top of the mounting holes on the rim of the speaker.
Cutout Dimensions
Refers to the dimensions of the hole, measured in inches or millimeters, required to contain the speaker.
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.

What is in the box?

Product and accessories
A detailed list of the equipment (main product and accessories) included with your in-dash car stereo receiver. If special accessories are included in the box, they will be listed and detailed below the main list of equipment.
WITB: Speakers
A detailed list of the equipment (main product and accessories) included with your speakers. If special accessories are included in the main box, they will be listed and detailed below the main list of equipment.
Other Accessory #1
Standard accessories are included in the main list above; however, this line provides specific details on an additional, unique accessory that is included with the product.
Other Accessory #2
Standard accessories are included in the list above special accessories; however, this line provides specific details on an additional, unique accessory that is included with the product.
Other Accessory #3
Standard accessories are included in the list above special accessories; however, this line provides specific details on an additional, unique accessory that is included with the product.
Other Accessory #4
Standard accessories are included in the list above special accessories; however, this line provides specific details on an additional, unique accessory that is included with the product.
Other Accessory #5
Standard accessories are included in the list above special accessories; however, this line provides specific details on an additional, unique accessory that is included with the product.
Paperwork
Paperwork included with the product.

Warranty and Return Policy

Parts Warranty Duration
3 years
Labor Warranty Duration
3 years
Warranty Provider
Manufacturer

Summary of Customer Ratings & Reviews

Rating Distribution

5 Star
64%
4 Star
36%
3 Star
0%
2 Star
0%
1 Star
0%

Average Attribution Rating

Durability
4.6
Value
4.9
Features
4.5
Design
4.7
Usability
4.7
Ben

McCall, ID

Overall
Durability
Value
Features
Design
Usability
decent deck for the price

September 5, 2015

i would recommend to anyone who just wants to use their bluetooth with their phone to listen to music. however, the bluetooth speaker phone function is not the best, so if you are looking to mainly use that function, i would go with a nicer deck. works well for what i need it for. Would recommend if youre on a budget.

18 of 21 found this helpful

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David

Geraldine, Alabama

Overall
Durability
Value
Features
Design
Usability
Review

October 5, 2015

Great product! Great sound! I'm really enjoying the stereo and speakers I received.

4 of 5 found this helpful

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Troy

Coon Rapids, MN

Overall
Durability
Value
Features
Design
Usability
Can't beat the quality for the price

February 4, 2017

If you actually rate this as knowing what you are buying for the price, you cant beat this deal. Yeah, you m****s that think that for this price you should have the quality of an Alpine and MBQuartz are going to rate this low, but anyone rational will give this 6 stars. The deck seems to pump out enough undistorted watts to fill my car comfortably. The speakers seem to handle them well.

2 of 2 found this helpful

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Anonymous

Detroit,Mi

Overall
Durability
Value
Features
Design
Usability
Great buy

August 30, 2018

I would definitely recommend this product only con is that it doesn’t display the name of the songs when playing them through BT

0 of 0 found this helpful

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denise

BANGOR, MI

Verified Purchase
Overall
Durability
Value
Features
Design
Usability
Am/cm radio with speakerz

October 25, 2016

Nice radio perfect fit. Nice sound. Haven't used the Bluetooth yet, but the radio and speakers works. Would order another one in the future.

0 of 0 found this helpful

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Zach

Iola, WI

Overall
Durability
Value
Features
Design
Usability
Great setup for the price

June 6, 2016

I was more than happy with this set up, only downside is the display shows the radio station not the time

0 of 0 found this helpful

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Gm

Bethlehem,pa

Overall
Durability
Value
Features
Design
Usability
Nice inexpensive radio

June 2, 2016

Bought this radio for my boat. It has gotten wet and is stored outside it still works great

0 of 0 found this helpful

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Jeff

Citronelle, AL

Overall
Durability
Value
Features
Design
Usability
Great Unit!!!

February 1, 2016

I installed the unit on my own with the included dash kit and harness. The unit works great and sounds high quality for the price. The only thing that is a little sideways is the volume knob is a little jumpy when you touch it. Other than that all around awesome product.

0 of 0 found this helpful

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rob

redwood city,CA

Overall
Durability
Value
Features
Design
Usability
good value

January 5, 2016

put this in daughters 96' 4 runner. Had one problem in that the factory holes in deck did not align with factory brackets or new mounting kit. It can be done but you need to alter the factory brackets a bit.
Deck sounds good and kid is happy

0 of 0 found this helpful

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Martin

Bonita Springs, FL

Overall
Durability
Value
Features
Design
Usability
great product

November 6, 2015

I Recommended easy installation and faster than others. Full dash kit

0 of 0 found this helpful

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Andrew

Nashua, NH

Overall
Durability
Value
Features
Design
Usability
Not good for 2001 chevy caviler

September 8, 2016

So i brought these for a 2001 chevy caviler. They do not match the speakers in the car. Never used the product

0 of 2 found this helpful

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Accessory Tools and Products

Accessories added

Belva 3.5mm Aux Cable (item#7576)

2 meter (6 feet) Aux to Aux Cable Connector, Great for iPod / MP3 Player headphone jack connection to car stereo aux input.

Your Price $4.99

Five Piece Installer's Panel Removal Tool Kit

Helps with removing dash and trim panels during car stereo installation.

Your Price $11.99

SoundKase DFC1X

Soft-Sided Nylon Receiver Faceplate Case

Your Price $8.99

Product Summary

Manufacturer

Model Number

638BCK

Weight

6.00lbs

Internal SKU

638bck

Internal Product ID

93795

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: Boss 638BCK