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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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Order within 25 hrs 23 mins to ship 10/24

Arrives by Friday, Oct. 28 to zip 94107

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50% off Complete Car Stereo Tool Kit with Purchase!

Save 50% on the Scosche TK12 installation tool kit with select purchase! This kit includes a voltage test light, wire stripper and many other tools you need to install your system! Cannot be combined with any other offer.




Boss 638BCK



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Scosche TK12 Car Audio Installation Kit


Special Price $9.49 ($18.99 if purchased separately)

Scosche TK12 Car Audio Installation Kit

12V Car Stereo Installation Kit • Includes Wire Stripper/Cutter, Screwdriver, RCA Cable Runner, Panel Removal Tool, Test Light, and other Installtion Accessories • Perfect for Installing a First Car Stereo

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Headunit Features:

  • In-Dash Digital Media, AM/FM, MP3, USB Receiver with Remote
  • Built-in Bluetooth for hands-free and audio streaming
  • Blue illuminated button lighting
  • Power Output:
    • Peak: 50 watts x 4 channels
  • 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
Faceplate 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.

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.
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.
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.


Playback Features

AM/FM Tuner
Most in-dash CD players have AM/FM playback allowing you listen to your favorite local radio stations.
FM Presets
The number of FM radio stations that can be stored as presets.
AM Presets
The number of AM radio stations that can be stored as presets.
Radio Data System (RDS)
Receivers with Radio Data System (RDS) tuners can receive digital broadcast information about the FM radio station including program name, time and station identification. RDS enables your receiver to display text messages that many FM stations include on a sub-carrier signal within their normal broadcast signal. Some RDS tuners can even break in with traffic alerts or emergency broadcasts when you're listening to a CD.
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.
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.
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.
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.
Dual Zone
Dual zone means the stereo is capable of playing multiple audio or video sources between two separate locations.

Please refer to the item description for more details on how dual zone works specifically to the unit you are viewing.

Hi-Res Audio Compatible
This feature refers to if the product is capable of Hi-Res Audio (HRA) playback.

Audio / Video Inputs

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
Number of Front USB Inputs
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.

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.

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

Warranty and Return Policy

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

Summary of Customer Ratings & Reviews

Rating Distribution

5 Star
4 Star
3 Star
2 Star
1 Star

Average Attribution Rating


McCall, ID

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.

17 of 20 found this helpful

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Geraldine, Alabama


October 5, 2015

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

3 of 4 found this helpful

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Nashua, NH

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 0 found this helpful

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Iola, WI

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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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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Citronelle, AL

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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redwood city,CA

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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Bonita Springs, FL

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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Accessory Tools and Products

Accessories added

6 Ft. 3.5mm to 3.5mm Aux Cable (Black)

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

Scosche TK12 Car Stereo Installation Kit

Includes panel removal tool, wire cutter/stripper, test light, RCA cable runner, screwdriver, and more!

Your Price $18.99

18 Butt Connectors, 2 Ring Terminals, and Zip Ties

Great for connecting your car stereo wires to the harness.

Your Price $4.99

Scosche SPL Meter

Monitor the noise level of your new car audio system with this SPL meter measuring from 60-135 dB.

Your Price $21.99

Browse 3 questions and 10 answers
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Why did you choose this?
Sonic Electronix Store
Great package for the price. Perfect for my sons 1st car and comes with all install kit! AMAZING!
Phillip G on Oct 8, 2016
my rear door speakers stop working and cd this is the best buy for me.
Marvin I on Jun 23, 2016
i believe this will fit my needs
Maurice B on Jul 16, 2016
My Son need a new radio for his car. This was the best deal that we could find.
Dena K on Sep 10, 2015
Can you plug in an iPhone or itouch to this radio?
Jiw W on Jun 26, 2015
Best Answer: I believe you can, through the AUX plug.
Reply · Report · David C on Aug 1, 2015
· Add Answer · I Have This Question Too (2)
Is there a radio wire harness adapter for this radio and speaker kit (Boss 638BCK) for a 1986 Ford F150 2WD. Standard Cab?
Ricky H on Oct 6, 2016
Best Answer:

Please contact our sales department if you have any further questions.
Reply · Report · Rick MStaff on Oct 6, 2016
· Add Answer · I Have This Question Too (0)

Product Summary


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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