Overview: The Kenwood KDC-BT645U AM/FM CD receiver features
a detachable face, front auxiliary and USB input, three pairs of 2.0-volt preamp
outputs, CD changer and Satellite Radio ready controls and built-in iPod operation,
as well as MP3/WMA/AAC playback. The unit also features built-in Bluetooth operation
with an integrated microphone. In addition, the CD player comes with an IR wireless
remote control. The unit's amplifier is rated at 22 watts x 4 channel RMS and 50
watts x 4 channel peak.
Detachable Face: The unit features a single front loading CD
face that detaches from the chassis to deter theft. The CD player comes supplied
with a soft black fabric, draw string face case to protect the detachable face
when you have it off the chassis.
Fluorescent Display: The Kenwood head unit features a
13-character white backlit fluorescent display with blue button illumination.
Display Illumination/Clock Display: When the unit is in
Standby mode, the face/button illumination is "keyed." In addition,
while the unit is in Standby mode, you can turn the clock display on or off.
When the Clock Display is turned on and the unit is in Standby mode, the Clock
Display is also "keyed." Pressing and holding the source button turns
the unit off completely.
Demo Mode: This unit features a Demo mode which can be
turned "on" or "off" within the menu.
MOSFET Amplifier: The Kenwood KDC-BT645U is equipped with a
MOSFET amplifier. Compared to conventional power supplies, the MOSFET
amplification circuit is smaller and more efficient, and it delivers increased
power with less distortion and absolutely zero on/off switching noise. More
power means louder and cleaner music at higher volumes because you're not
pushing the limits of the amplification circuit. The power output specs for the
KDC-BT645U are as follows:
- Full Bandwidth Power: 22 watts RMS x 4 channels (at 4
ohms, 20-20kHz, 1% THD)
- Maximum Output Power: 50 watts x 4 channels
Rotary Volume Control: The CD receiver uses a 3-way rotary
volume control that increases and decreases the volume of the stereo from 0 to
35. The rotary knob also controls other audio settings such as Balance, Fader,
Bass, Mid, Treble and preset EQ settings. In addition, the rotary knob allows
you to scroll through and select your music tracks when the Music Search
function is activated.
Speaker Settings: The Speaker Setting function tailors the
System Q Sound Control settings according to the type of speakers in your
vehicle. You may select a Speaker Setting of "SP Off" (flat), "SP OEM" (for OEM
factory speaker systems), "SP 6x9/6" (for systems with 6" and 6"x9" speakers),
or "SP 5/4" (for systems with 4" and 5" speakers).
System Q Sound Control: Eight EQ curves are preset into
memory, allowing you to recall the best preset EQ curve for different types of
music. Each preset has its own level settings for bass (100Hz), midrange (1kHz),
and treble (10kHz). You can choose from the following preset EQ curves - Rock,
Pops, Easy, Top 40, Jazz, Natural, User, and Game.
Bass/Treble/Mid Control: The KDC-BT645U also features
independent Bass, Treble and Midrange control. You can adjust each one from -8
to +8db. The bass frequency is adjusted at 100 Hz, the treble frequency is
adjusted at 10 kHz and the midrange frequency is adjusted at 1 kHz.
Bass Boost: The Kenwood CD receiver also features a Bass
Boost control that can be set to the following levels - LV11, LV2 or Off.
Source Tone Memory: This feature allows you to store System
Q bass, middle and treble tone settings for each source (CD, Tuner, Aux, and
3-Sets of Preamp Outputs: The KDC-BT645U features front,
rear and subwoofer preamp outputs. The front and rear speaker preamp outputs
are balance and fade adjustable. The subwoofer preamp output is non-fading.
The front, rear and subwoofer preamp outputs are all fixed to the rear chassis
of the head unit. The subwoofer preamp output offers the following controls:
- Low Pass Filter: The receiver features a built-in Low
Pass Filter control for the preamp-output when the output is set to Sub. You
can select from 85Hz, 120Hz, 160Hz or Through (Off).
- Subwoofer Phase: You can also adjust the phase of the
subwoofer output between 180-degrees (Reverse) or 0-degrees (Normal).
- Subwoofer Level: Once you have switched the preamp
output to "subwoofer" you can independently control the subwoofer preamp
output level from the CD receiver. You select levels between -15 to +15.
Volume Offset: The level of each source may be independently
adjusted to prevent radical leaps in output volume when switching from one
source to another. The available settings range from -8 to 0 (-8 to +8 for Aux
Tel Mute: The KDC-BT645U features a cell-phone mute wire
(brown) in its harness that when hooked up to your car's phone system mute wire
will automatically mute the receiver's audio signal when a call comes in.
Key Beep: The in-dash head unit provides an audible beep to
confirm button operation. This function can be turned On or Off.
AM/FM Tuner: The Kenwood KDC-BT645U features a built-in
AM/FM tuner. You can choose one of three tuning modes: Auto 1 (seek tuning),
Auto 2 (cycles through and tunes the selected band's preset stations only with
each button press), or Manual.
Tuner Presets: The KDC-BT645U's tuner features 3 FM banks
(1, 2, 3) and 1 AM bank for storing presets. The Kenwood KDC-BT645U offers two
- Normal: You can store 6 presets for each AM/FM bank
giving you a total of 18 FM presets and 6 AM presets.
- Mix: You can store a mixture of 6 AM/FM presets for
each AM/FM bank giving you a total of 24 AM/FM presets of any mixture.
Auto Memory Tuning: Not only does the CD receiver's tuner
allow you manually enter your desired presets you can choose to have the unit
automatically put stations with good reception in the memory banks
automatically; this is a handy feature when traveling.
Direct Tuning: You can tune in a desired AM/FM radio station directly
by entering the frequency number using the included remote control.
Mono Mode: This feature reduces the noise (static) when a stereo
broadcast is received as monaural (for FM band only).
Satellite Radio Ready: There are several options for connecting
an optional XM or SIRIUS Satellite Radio receiver to this receiver:
- SIRIUS Satellite Radio: To receive
SIRIUS Satellite Radio, you can connect the optional SIRIUS
Universal Vehicle Tuner (607SCC1) and the optional Kenwood
Sirius Satellite Radio Interface (113KCASR50); package item
700SIRKENW, or you can connect the optional KCA-SR50
Kenwood Sirius Satellite Radio Interface and the SiriusConnect
vehicle docking kit (607SCVDOC1); package item number
along with your compatible SIRIUS Dock & Play receiver.
- XM Satellite Radio: To receive XM Satellite Radio
connect the optional CNP2000UCA XM Tuner and the Kenwood CNPKEN1
adapter cable (700XMKEN2, sold separately).
Note: A subscription is also required
to receive satellite radio programming from SIRIUS or XM.
HD Radio Ready (with iTunes Tagging): With an optional Kenwood HD Radio tuner
(113HR300, sold separately), you will be able to receive digital AM/FM broadcasts
from local stations where available. This new technology will significantly
improve audio quality and reception, as well as include information such as
artist name and song titles or traffic news, viewable on the receiver's display.
The Kenwood KTC-HR300 HD Radio tuner is also capable of iTunes
tagging. iTunes tagging gives you the ability to tag a song (up to 50) and
stores it to a connected iPod. The next time your iPod is connected to iTunes,
the tagged songs are displayed with the option to purchase them from the iTunes
Note: You will need the Kenwood KCA-S220A Dual-Source
Switching Unit (113KCAS220,
sold separately) to connect both a Satellite Radio Tuner and HD Radio Tuner
to this headunit.
MP3/WMA/AAC Playback: The KDC-BT645U can play MP3 (8-320
kbps), WMA (32-192 kbps), and AAC (8-320 kbps)
files recorded on CD-ROM, CD-R, and CD-RW discs in ISO9660 Level 1/Level 2,
Joliet, Romeo, and Long file name formats. Each disc should have a maximum
of 8 directory levels, 50 folders, and 255 files per folder with a maximum
of 512 files and folders. During MP3/WMA/AAC playback, the unit displays
recorded ID3 Tag (Ver.1/2.2/2.3/2.4) information. The head unit will display up to
Note: AAC ID3 Tag information cannot be displayed.
Supreme Setting: When MP3 or WMA files encoded at a low bit
rate (less than 96 kbps, 44.1k, 48kHz) are played, the Supreme Setting function
restores their high frequencies so the sound quality is closer to files encoded
at a high bit rate. The processing is optimized for the compression format and
the bit rate used. When the Supreme Setting is Off, the unit plays the original
sound stored in the audio file.
Text Scroll: The KDC-BT645U will display CD text or Audio
file text. You can set the text scrolling feature to two different modes (Auto
or Manual) to scroll longer titles across the screen.
Music Search: The Kenwood AM/FM CD receiver features a Music
Search feature which allows you to scroll through and select your MP3/WMA/AAC music
folders and files, as well as scroll through your audio CD's music tracks using
the head unit's rotary knob.
Direct Music Search: The supplied IR wireless remote control
(RC-405) allows you to search for music directly by entering the track number.
Last Position Memory: If the unit is shut off or switched to
the tuner mode while a CD is playing, the next time CD is selected as the source,
playback will resume from the point where it left off.
CD Read: This function sets the method for reading a CD
disc. You can choose between two modes:
- CD1: Automatically distinguishes between audio file
disc and music CD when playing a CD, CD-R/RW disc.
- CD2: When unable to play a special formatted CD, set
this function to CD2 to force playing. Some music CD discs may be
unplayable even when set to this mode.
Off Eject: The KDC-BT645U allows you to eject your disc for
10 minutes after switching off the vehicles engine.
Note: The unit will not allow you to load a CD while is
powered off. The unit must be On or in Standby mode to load a disc.
USB Port: The Kenwood KDC-BT645U features a front panel
Full-Speed (Max. 12Mbps) 2.0
USB type-A port that is hidden behind a sliding cover. The USB port enables
connection and control of a portable USB mass-storage class device with MP3
(8-320 kbps), WMA (32-192 kbps), and AAC (8-320 kbps) music files. The USB port is compatible with
all USB mass storage class devices that support the FAT16 or FAT32 file system.
Your USB device should only have a maximum of 8 directory levels, 255 folders,
and 255 files per folder with a maximum of 65,025 files and folders. During
MP3/WMA/AAC playback, the unit displays recorded ID3 Tag (Ver.1/2.2/2.3/2.4) information. The head unit will display up to
characters. When your
USB device is connected to this unit, it can be charged up provided that the
KDC-BT645U is powered on.
Note: AAC ID3 Tag information cannot be
displayed. You cannot connect a USB device
via a USB hub or Multi-Card Reader to this unit.
iPod Direct: The KDC-BT645U's front-panel USB port also acts
as an iPod/iPhone high-speed direct connection when used with the optional
Kenwood USB Direct Connection Cable
(113iP101, sold separately) or the USB/iPod cable that comes with your iPod/iPhone.
Using either cable allows audio playback, music navigation, information display,
and charging of select iPod/iPhone models from the KDC-BT645U.
- USB Connection: The USB connection allows your iPod's
large music libraries to be loaded instantly to the headunit and sound
quality to be maximized through the headunit's 24-bit D/A converter,
allowing for a Signal to Noise ratio up to 105dB.
- Audio Playback: The Kenwood headunit supports audio
playback of music files and podcasts stored on your iPod or iPhone.
- Music Navigation: When your iPod/iPhone is connected to
the KDC-BT645U, you can choose to operate your iPod/iPhone via the Kenwood
headunit's controls or your iPod/iPhone's clickwheel or touchscreen. If you
select to control your iPod/iPhone from the KDC-BT645U, the Kenwood headunit
will allow you to navigate your iPod's music by Playlist, Artists, Album,
Genre, Composer, Song, or Podcast (your iPod's click-wheel/touch-screen will
be locked in this mode). You can search these categories alphabetically or
using a percentage search (0.5%, 1%, 5%, 10%). You can also browse for music
of the same artist or genre as the one being currently played (Related
Search). In addition, you can create your own custom iPod playlist (up to 10
songs) from the headunit.
- Information Display: The KDC-BT645U will also display
your iPod/iPhone's music file information when you are controlling your iPod
or iPhone from the Kenwood headunit. If you choose to operate your connected
iPod/iPhone via its clickwheel or touchscreen controls, the KDC-BT645U will
not display your iPod's music information (the headunit will instead display
- Charging: While connected and the ignition switch is
set to ACC or ON, the headunit's USB connection will power and charge your
Note: If your iPod/iPhone has no initial battery charge,
then the unit will not recognize it.
iPod/iPhone Compatibility Chart: The Kenwood KDC-BT645U is
"Made for iPod/iPhone" compatible and supports the following iPod/iPhone model
features (as of Feb. 2010):
| iPod/iPhone Model || Generation || |
|Audio ||Video ||Headunit ||iPod/iPhone ||Song/Artist
Info ||Track Info |
dock-connector ||3rd || N || N || N || N || N || N || N |
|4th || N || N || N || N || N || N || N |
|mini ||1st ||N ||N ||N ||N ||N ||N ||N |
|2nd ||N ||N ||N ||N ||N ||N ||N |
||5th || Y || N || Y || N || Y || Y || Y |
| classic ||80GB || Y || N || Y || Y || Y || Y || Y |
|120GB || Y || N || Y || Y || Y || Y || Y |
|160GB || Y || N || Y || Y || Y || Y || Y |
| nano ||1st || Y || N || Y || N || Y || Y || Y |
| 2nd || Y || N || Y || Y || Y || Y || Y |
|3rd || Y || N || Y || Y || Y || Y || Y |
|4th || Y || N || Y || Y || Y || Y || Y |
|5th || Y || N || Y || Y || Y || Y || Y |
|6th || Y || N || Y || Y || Y || Y || Y |
| touch || 1st || Y || N || Y || Y || Y || Y || Y |
| 2nd || Y || N || Y || Y || Y || Y || Y |
| 3rd || Y || N || Y || Y || Y || Y || Y |
| 4th || Y || N || Y || Y || Y || Y || Y |
| iPhone ||2G || Y || N || Y || Y || Y || Y || Y |
| 3G || Y || N || Y || Y || Y || Y || Y |
| 3GS || Y || N || Y || Y || Y || Y || Y |
| 4 || N || N || N || N || N || N || N |
Note: Apple iPod/iPhone software updates may change
functionality results. If you download a newer software version, you may
need to reset the headunit and your iPod/iPhone to regain functionality.
If this doesn't work, you may need to revert to the older software
version or wait until an newer software update is available. Not
compatible with iOS 4.0 for iPhone (3G/3GS) or iPod touch (2nd/3rd gen).
AUX Input: The KDC-BT645U is equipped with a front panel 3.5mm
mini-jack auxiliary input for connecting external portable audio devices such as
an MP3 player. The KDC-BT645U allows you to select the
source type displayed when using the auxiliary input. You can choose from AUX,
DVD, Portable, Game, Video or TV.
Rear Auxiliary Input "Ready": The unit already features a
front panel auxiliary input, but if you need a second auxiliary input, one can
be added to the rear of the unit. When used with an optional adapter, this unit
can accept a rear input from an auxiliary source. When the CA-C1AUX adapter (113CAC1AX,
sold separately) is used, you cannot connect a CD changer to the head unit
because the adapter plugs into the DIN changer control connection on the head
unit. When the KCA-S220A 2-changer switch (113KCAS220,
sold separately) is used, you can connect a CD changer and an auxiliary audio
source at the same time. When an auxiliary audio source is connected, you can
choose from one of six names for the source: AUX, DVD, Portable, Game, Video or
Built-In Bluetooth: The Kenwood KDC-BT645U CD-Receiver
features built-in 2.4GHz Bluetooth technology (version 2.0) with a range of
32.8 ft and supports the following profiles: HFP (Hands Free Profile), HSP
(Headset Profile), OPP (Object Push Profile), PBAP (Phonebook Access Profile),
SPP (Serial Port Profile), and SYNC (Synchronization Profile). The controls
of the KDC-BT645U can be used to dial a number, answer an in-coming call or
end a call. The KDC-BT645U can even be setup to automatically answer a call.
The unit also features an integrated microphone with adjustable gain on its
front panel so you can carry on your side of the conversation while listening
to the caller through your car's front speakers. During a conversation, you
can switch between the Private Mode (talking directly on your cell phone) and
the Hands Free Mode. Your cell phone must be paired with the KDC-BT645U before
you make and receive calls. You can register up to five cell phones (only one
paired phone can be used at a time). You can also wirelessly download the short
message (SMS) arrived at your cell-phone so that is can be read on the head unit's
display. Using the KDC-BT645U, you can dial a phone number in one of the following
- Entering a Phone Number: Allows you
to directly dial a phone number up to 25digits.
- Speed (Preset) Dialing: Allows you to register
up to 6 phone numbers for quick dialing.
- Phone Book: You can dial by using the
downloaded phone book. You can download phone book data
from your cell phone to the KDC-BT645U. Up to 1000 numbers
can be stored for each registered cell phone. Each number
can be up to 32 digits long and each name can be up to 50
characters long. You can search for a number by the initials,
or you can search the phone book in alphabetical order.
- Call Log: The Call Log
is a list of calls that have originated from and were received by this unit
that you can dial. You can select Outgoing, Incoming, or Missed calls.
- Outgoing Call List: Allows you to dial
by using the outgoing call list. Up to 10 phone numbers are
stored in the outgoing call list.
- Incoming Call List: Allows you to dial
by using the incoming call list. Up to 10 phone numbers are
stored in the incoming call list.
- Missed Call List: Allows you to dial
by using the missed call list. Up to 10 phone numbers are
stored in the missed call list.
- Voice Dialing: If your phone supports
voice recognition, then you can dial out by voice command.
You can register up to 35 voice tags (audio sound is not output during voice
- Call Waiting: You can answer another incoming call with the
current call suspended.
Note: Not all Bluetooth mobile phones will be
compatible. Visit Kenwood's web site for a
complete list of compatible Bluetooth enabled phones.
IR Remote Control: The KDC-BT645U comes with the RC-405 IR
wireless remote control with a full numeric keypad (0-9). The remote will
control Audio, CD, Tuner, Bluetooth, and external device functions. The remote
control allows direct access of your music tracks and discs
loaded in a connected CD-changer (sold separately), as well as direct access to
AM/FM radio stations. It is powered by a single
CR2025 3V lithium-cell battery (supplied).
Steering Wheel Remote Compatibility: The unit also features
an OEM steering wheel remote control input on the rear of the unit that lets you
keep your vehicle's factory radio steering wheel remote controls when used with
the optional PAC SWI-JACK Steering Wheel Control Interface Adapter (127SWIJACK,
sold separately); or the optional Metra ASWC Steering Wheel Control Interface
Note: Please consult the
Crutchfield Car Selector to see if your vehicle is compatible.
Music Editor Compatible: The Kenwood KDC-BT645U supports the
PC application, Kenwood Music Editor Lite (ver.l.0 or later). Kenwood Music
Editor Lite is a desktop software that helps organize, manage and transfer AAC,
MP3, and WMA music files to your USB devices from your PC. When you playback
audio files that have been stored on your USB device using Kenwood Music Editor
Lite (ver.l.0) through this unit, you can search a file by title, album, or
artist name using the head unit's Music Search function.
Note: Kenwood Music Editor software can be downloaded
for free from Kenwood.com to your PC. Kenwood Music Editor is compatible
with Microsoft Windows XP Professional and Microsoft Windows XP Home Edition
SP2 or later. Kenwood Music Editor (Ver.1.5.0 and later) are compatible with