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Kenwood KAC-746

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Comments to date: 5. Page 1 of 1. Average Rating:
bega 8:28am on Tuesday, June 14th, 2011 
i use it to power my 2 12" on fullrange and i never regret it. its giving me great sound and quality
gemal 5:52pm on Wednesday, July 28th, 2010 
"This is a Very good amp, but the only problem i had was i had one 12inch Kenwood Sub running Bridged.
lmirko 12:38am on Wednesday, July 7th, 2010 
Cheap amp, nothing special I had extra car audio stuff in my closet and decided to hook it up in my truck. BEAST I am most definately pushing the crap out of this amp. 1.33 ohms, where its 4 ohm stable, its extremely clean.
antares 7:28am on Monday, June 7th, 2010 
"Bought this amp to power my new Alpine Type-R front compnents. Seems to power them to their full potential. "I bought this amp to power a set of Soundstream 12' Tarantula series subs in a 2007 Peterbilt road tractor. The sound is great.
dehuszar 3:57pm on Sunday, May 16th, 2010 
great for the price I would buy again and again great price fast ship really good sound for price Solid I have to give this product a big thumbs up, its good enough to push 2 12" JBL Subs with pretty good power, accurate bass.

Comments posted on www.ps2netdrivers.net are solely the views and opinions of the people posting them and do not necessarily reflect the views or opinions of us.

 

Documents

doc0

KAC-746

4-CHANNEL POWER AMPLIFIER

INSTRUCTION MANUAL

B64-1176-00 (EM)

Safety precautions

2WARNING
Take the following precautions to prevent fire and avoid personal injury :
When extending the battery cable, or ground cable, use 5mm2 (AWG10) or larger automotive grade cable to avoid cable deterioration or damage to the covering. Check that no metal objects (coins, tools, etc.) are left inside the unit to avoid short circuits. If you smell or see smoke, turn the power off immediately and consult your Kenwood dealer. Do not touch the unit during use because the surface of the unit becomes hot and may cause burns if touched.
Do not open the top or bottom cover. Do not install the unit in places it is exposed to direct sunlight, high heat or humidity, water may splash over it, or dust exists.
If you have difficulty in installing this unit in your vehicle, contact your Kenwood dealer.

Cleaning the unit

If the surface is dirty, wipe it clean with a silicon cloth or soft dry cloth with the power off.

2CAUTION

Do not use hard cloths or paint thinner, alcohol, or other volatile solvents. These may damage external surfaces or remove indicator characters.
Take the following precautions to keep the unit in proper working order.
Be sure the unit is connected to a 12V DC power supply with a negative ground connection.

Accessories

Part name
Battery cable (Yellow) (6 m) Ground cable (Black) (1 m) Self-tapping screws (mm) Terminal cover (Power terminal)

External View

Number of Items
Round terminal (Large) Round terminal (Medium) Round terminal (Small) Grommets

Installation procedure

1. Remove the ignition key and disconnect the negative - terminal of the battery to prevent short circuits. 2. Set the unit according to the intended usage. 3. Connect the input and output cables of the units. 4. Connect the speaker cables. 5. Connect the power cable, power control cable and grounding cable following this order. 6. Install the unit in the car. 7. Connect the negative - terminal of the battery. 2CAUTION Be sure to turn the power off before changing the setting of any switch. If the fuse blows, check cables for shorts, then replace the fuse with one of the same rating. Check that no unconnected cables or connectors are touching the car body. Do not remove caps from unconnected cables or connectors to prevent short circuits. Connect the speaker cables to appropriate speaker connectors separately. Sharing the negative cable of the speaker or grounding speaker cables to the metal body of the car can cause this unit to fail. After installation, check that the brake lamps, winkers, and wipers work properly.

Installation

Self-tapping screw (mm)
Installation board, etc. (thickness : 15 mm or more) Since the power amplifier has no parts which require operation, it can be installed at a position away from the drivers seat without any hindrances. As generally accepted positions for its installation, places such as inside the trunk, etc. can be considered. Use the extension cables. (Optional.) Length 0.5m 1m 2m 4m 5m 6m Type RCA cable CA-2SL CA-12SL CA-22SL CA-52SL RCA cable (7mm) CA-3WL CA-13WL CA-23WL CA-53WL RCA cable (12mm) CA-5W CA-15W CA-25W CA-45W CA-65W 2CAUTION Do not install the unit under the carpet. Otherwise heat build-up occurs and the unit may be damaged. Install this unit in a location which allows heat to easily dissipate. Once installed, do not place any object on top of the unit. After installing the unit, check to make sure that electrical equipment such as the brake lamps, turn signal lamps and windshield wipers operate normally. Install the unit securely in a location that does not interfere with driving.

Controls

This is a 4 channel amplifier including 2 stereo amplifiers in a body. One amplifier is referred to as amplifier A and the other is amplifier B. This unit is compatible with a large variety of systems by combining the switches and functions described in the following.

FUSE(30A) POWER IN

BRIDGED

BATT P.CON(REMOTE)

SPEAKER OUTPUT BRIDGED A A B L R B
SPEAKER LEVEL INPUT LEFT RIGHT A SPEAKER LEVEL INPUT A B B L R

INPUT SENSITIVITY(V)

0.5 0.3

GND MONO L

A LINE IN B

A + B L

LINE OUT INPUT SENSITIVITY(V)

0.5 1.0 0.3

FILTER

OPERATION

1.0 MIN STEREO MONO(Lch) L+R MAX

OPERATION R A B A R

OFF HPF LPF

100 80

150 OFF HPF LPF 50 LPF HPF 200

LPF HPF 200

4 CHANNEL POWER AMPLIFIER

MAX STEREO MONO(Lch) L+R

FREQUENCY(Hz)

CONTROL A

INPUT SELECTOR

CONTROL B

Amplifier A

# $ %^

Amplifier B
1 Fuse (30 A) 2 Battery terminal 3 Ground terminal 4 Power control (REMOTE) terminal 5 Amplifier A speaker output terminals 6 Amplifier B speaker output terminals 7 Speaker level input terminals 8 FREQUENCY control
When the FILTER switch is set to the HPF (High-Pass Filter) or LPF (Low-Pass Filter) position, the threshold frequency can be adjusted with this control.

9 FILTER switch

High-pass or low-pass filtering can be applied to the speaker output according to the setting of this switch.

0 OPERATION switch

The amplification methods of the signals input to amplifiers A and B can be selected independently according to the setting of this switch.

STEREO position:

The amplifier can be used as a stereo amplifier.

L+R position:

The input left and right signals are combined before being amplified. Use this position when the unit is used for subwoofer speakers or the L+R (monaural) sound is required.

MONO (Lch) position:

Amplifies the signal input from the left side only. Set to this position and make bridged connections to use as a high-power monaural amplifier. (The input right signal is not output.)
! INPUT SENSITIVITY control
Set this control according to the pre-output level of the center unit connected with this unit, or to the maximum power output of the genuineaccessory car stereo. Use the diagram on the right as a guide. NOTE For the pre-output level or the maximum power output, refer to the Specifications in the instruction manual of the center unit.

15 0.5 0.3

1.0 MIN (W) MAX
@ RCA cable ground lead terminal # INPUT SELECTOR switch
This switch selects the input method of the signals to be amplified by amplifiers A and B.

A B position:

Amplifies both of the signals input to amplifiers A and B.

A position:

Amplifies only signal input amplifier A with both amplifiers A and B.
$ Amplifier A LINE IN terminal % Amplifier B LINE IN terminal ^ LINE OUT terminal
These jacks output respectively the signals input to amplifiers A and B. They always output the stereo signals regardless of the position of the OPERATION switch.

Protection function

This unit is equipped with a protection function for protecting this unit and your speakers from various accidents or problems that can occur. When the protection function is triggered, the Power indicator goes off and the amplifier stops operating. s Power indicator:

When the power is turned on, the Power indicator lights. If the Power indicator does not light when the power is turned on, the protection function may be activated. Check whether there is any indication of trouble. Power indicator
s The protection function activates in the following situations:
When a speaker output contacts ground. When the unit malfunctions and a DC signal is sent to the speaker output. When the temperature of internal parts exceeds 120C (248F). When a ground cable of the center unit (cassette receiver, CD receiver, etc.) or this unit is not connected to a metal part serving as an electrical ground passing electricity to the battery's negative - terminal.

Connection

sRCA cable connection
BLINE IN (Rear) CENTER UNIT (Cassette receiver, CD receiver, etc.) Power control cable

POWER IN

2CAUTION Do not connect cables and leads to both RCA cable input jacks and the speaker input terminals simultaneously, for this may cause malfunction or damage.
ALINE IN (Front) RCA cable (Commercially available part)

A Left input (White)

0.5 0.3 1.0 MAX

B Left input (White)

GND MONO L A LINE IN B A
1.0 MIN STEREO MONO(Lch) L {R
MAX STEREO MONO(Lch) L {R
A Right input (Red) B Right input (Red) RCA cable ground terminal 2CAUTION When using an RCA cable with Do not use this terminal for power source a ground lead attached, connect grounding. This unit will be damaged if the the ground lead to this terminal. power source grounding wire is connected to this terminal.
sSpeaker level input connection
Connect the unit by inserting it in the connection between the genuine-accessory car stereo and speakers. Power control (REMOTE) lead terminal ACC
Front A Right input (Front right)
SPEAKER LEVEL INPUT LEFT RIGHT A SPEAKER LEVEL INPUT A B L R
A Left input (Front left)

Battey

Genuine-accessory car stereo

B Left input (Rear left)

B Right input (Rear right)
The genuine-accessory car stereo shall have a Rear maximum power output of no more than 25 W. Do not connect the speaker output leads from a power amplifier (Optional) to the speaker input terminals of this unit, for this may cause malfunction or damage. Do not connect cables and leads to both RCA cable input jacks and the speaker input terminals simultaneously, for this may cause malfunction or damage. Connect the power control lead to a power supply which can be turned ON/OFF by the ignition key switch (ACC line). With this connection, shock noise may be generated when the power of the genuine-accessory car stereo is switched ON/OFF.

sPower and Speakers cable connection
If a buzzing noise is heard from the speakers when the engine is running, connect a line noise filter (optional) to each of the battery cable. Do not allow the cord to directly contact the edge of the iron plate by using Grommets.

FUSE(30A)

Power control (REMOTE) lead terminal A Left output (Front left)
Front left speaker Front right speaker A Right output (Front right)
Terminal cover Battery cable (Yellow) Fire wall Grommets Round terminal (Large) B Left output (Rear left)
B Right output (Rear right) Rear right speaker Rear left speaker

Battery

Ground cable (Black)

Power control cable

2WARNING To prevent fire caused by a short in the wiring, connect a fusible link or breaker nearby the batterys positive terminal. NOTE Connect the ground cable to a metal part of the car chassis that acts as an electrical ground passing electricity to the batterys negative - terminal. Do not turn the power on if the ground cable is not connected.
Power terminal Pass battery and ground cables through supplied terminal cover and connect to respective terminals. After completing connections, fasten terminal cover over terminal bracket. Round terminal (Medium) Round terminal (Small)

(Bridged)

2CAUTION If you wish to bridge-connect a speaker, the speaker impedance must be no less than 4 ohms. Connecting a speaker with an impedance lower than 4 ohms may damage the unit. examples:

A Bridged

B Bridged

System examples

s Full-range 4-channel + Subwoofer system

L R L R L R

Switch setting

A+B LINE OUT

L R L R

150 OFF HPF LPF

CENTER UNIT

50 LPF HPF 200

STEREO MONO(Lch) L+R
CONTROL A OPERATION FILTER
OFF HPF LPF MONO(Lch) STEREO L+R 100

Amplifier

s High-power 2-channel system

(Bridged) (Bridged)

R L R L R
s High-pass (80 Hz) + Subwoofer(80 Hz) system
(High pass) Subwoofer (L + R) (Bridged)
CONTROL A A B A OPERATION FILTER

s Tri-mode

C C C L
qPrinciple of Tri-mode Method of frequency band division using a coil and capacitorin case of 6dB/oct. slope Coil (L): Passes low frequencies and blocks high Crossover Frequency frequencies. (Low pass) 0 dB Capacitor (C): Passes high frequencies and blocks low -3 dB frequencies. (High pass) 159000 L C C= (F) fc=Cut of Frequency (Hz) fc x R R=Speaker Impedance () 159 x R Frequency L= (mH) fc qExample: When it is required to set a crossover frequency of 120 Hz using speakers with an impedance of 4 ohms. Prepare commercially-available coil and capacitor with the closest ratings to the results calculated from the formula above. The capacitor rating should be as close as possible to 331.25 (F) and the coil rating should be as close as possible to 5.3 (mH). 2CAUTION If you wish to bridge-connect a speaker, the speaker impedance must be no less than 4 ohms. Connecting a speaker with an impedance lower than 4 ohms may damage the unit.

Troubleshooting guide

Often, what appears to be a malfunction is due to user error. Before calling for service, please consult the following table. Symptom
No sound. (No sound from one side.)
Input (or output) cables are disconnected. Protection circuit may be activated. The fuse may be blown because the volume was too high. The input sensitivity adjusting control is not set to the correct position. The speakers cable are connected with wrong + / polarity. A speaker cable is pinched by a screw in the car body. The switches may be set improperly.

Remedy

Connect the input (or output) cables. Check connections by referring to "Protection function". Replace the fuse with a new fuse and use a lower volume. Adjust the control correctly referring to Controls. Connect them properly checking the + / - of the terminals and cables well. Connect the speaker cable again so that it is not pinched by anything. Set switches properly by referring to "Controls" and "System examples".
The output level is too small (or too large). The sound quality is bad. (The sound is distorted.)

Specifications

Specifications subject to change without notice.

Audio Section

Max Power Output (4 ) 4 Channel Mode....70 W Channel Mode...70 W 2 + 200 W Channel Mode....200 W 2 Rated Power Output (4 ) 4 Channel Mode...35 W 4 (DIN45324, +B=14.4 V) 3 Channel Mode).35 W 2 (1 kHz, 0.08 % THD) + 100 W 1 (1 kHz, 0.8 % THD 2 Channel Mode..100 W 2 (1 kHz, 0.8 % THD) Rated Power Output (2 ) 4 Channel Mode...50 W 4 (1 kHz, 0.8 % THD) Frequency Response (+0, 1 dB)...5 Hz ~ 50 kHz Signal to Noise Ratio...100 dB Sensitivity (MAX) (rated output)....0.15 V Sensitivity (MIN) (rated output)....4.0 V Input Impedance....10 k Low Pass Filter (12 dB/oct.) (Variable)..50 ~ 200 Hz High Pass Filter (12 dB/oct.) (Variable)..50 ~ 200 Hz

General

Operating Voltage...14.4 V (11 ~ 16 V allowable) Current Consumption (1 kHz, 10% THD)...28 A Dimensions (W H D)...230 mm Weight.....3.1 kg

 

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