System examples

■High-pass + Subwoofer system

 

 

 

 

1.0

 

FILTER

 

OPERATION

0.5

 

 

 

 

OFF

 

STEREO

MONO(Lch)

 

 

HPF LPF

0.3

CENTER UNIT

 

 

 

INPUT

 

 

 

MIN

MAX

 

INPUT SELECTOR CONTROL

A

 

SENSITIVITY(V)

 

A B A

B

 

 

 

 

CONTROL

 

 

1.0

 

 

 

 

 

 

FILTER

 

OPERATION

0.5

 

OFF

 

 

(Lch)

MAX

Switch setting

HPF LPF

STEREO

MIN

MONO

0.3

 

INPUT

SENSITIVITY(V)

L

R A

L

R B

LLINE R OUT

L (High pass)

R

BRIDGED

Subwoofer

 

 

(L + R)

 

(Bridged)

■High-power 2-channel system

 

 

 

 

1.0

 

FILTER

 

OPERATION

0.5

 

 

 

 

OFF

 

STEREO

MONO(Lch)

 

CENTER UNIT

HPF LPF

0.3

 

 

 

 

 

 

 

MIN

MAX

 

INPUT SELECTOR CONTROL

A

 

INPUT

 

 

SENSITIVITY(V)

 

A B A

B

 

 

 

 

CONTROL

 

 

1.0

 

 

 

 

 

 

FILTER

 

OPERATION

0.5

 

OFF

 

 

(Lch)

MAX

Switch setting

HPF LPF

STEREO

MIN

MONO

0.3

 

INPUT

SENSITIVITY(V)

L

R

L

R A

L

R B

LLINE R OUT

BRIDGED BRIDGED

Left speaker

Right speaker

■Tri-mode

 

 

 

 

1.0

 

FILTER

 

OPERATION

0.5

 

OFF

 

STEREO

MONO(Lch)

 

 

HPF LPF

0.3

CENTER UNIT

 

 

 

INPUT

 

 

 

MIN

MAX

 

INPUT SELECTOR CONTROL

A

 

SENSITIVITY(V)

 

A B A

B

 

 

 

 

CONTROL

 

 

1.0

 

FILTER

 

OPERATION

0.5

 

OFF

 

 

(Lch)

MAX

Switch setting

HPF LPF

STEREO

MIN

MONO

0.3

 

INPUT

SENSITIVITY(V)

(High pass)

LL

R A

R

L

R B

L

LLINE

R OUT R

C L

C L

Subwoofer

(L + R) (Bridged)

●Principle of Tri-mode

Method of frequency band division using a coil and capacitor•••in case of 6dB/oct. slope

Crossover Frequency

Coil (L): Passes low frequencies and blocks high

 

frequencies. (Low pass)

0 dB

 

 

 

Capacitor (C): Passes high frequencies and blocks low

-3 dB

 

 

 

 

frequencies. (High pass)

L

C

C=

159000

(µF)

fc=Cut of Frequency (Hz)

 

 

fc x R

 

Frequency

L=

159 x R

(mH)

R=Speaker Impedance (Ω )

 

 

●Example:

 

 

fc

 

 

 

 

 

 

 

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

(µF) 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.

•Be sure to connect capacitors to speakers to which high frequencies will be passed. Failure to do so will result in a drop of the combined impedance with the subwoofer.

•Ensure that the withstand voltage and current ratings of the capacitors (C) and coils (L) are sufficient.

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Kenwood KAC-648 High-pass + Subwoofer system, High-power 2-channel system, Tri-mode, Example, Impedance of 4 ohms
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KAC-648 specifications

The Kenwood KAC-648 is a highly regarded car amplifier that is designed to enhance the audio experience in vehicles. Known for its robust performance and advanced features, this amplifier is a top choice for audio enthusiasts looking to upgrade their sound system.

One of the standout features of the KAC-648 is its powerful output capability. It delivers a peak power output of 600 watts, with a continuous power of 75 watts per channel at 4 ohms. This ensures that even the most dynamic audio tracks can be played with clarity and volume without distortion. The amplifier is capable of driving various speaker configurations, making it versatile for different setups in automobiles.

The KAC-648 employs a Class AB circuitry design, which is known for providing a good balance between sound quality and power efficiency. Class AB amplifiers are favored in the automotive audio community because they deliver a warm and rich sound while also maintaining low heat levels during operation. This means that users can enjoy long listening sessions without worrying about the amplifier overheating.

In terms of installability, the KAC-648 comes with various features that facilitate easy integration into any car audio system. It includes speaker level inputs, allowing the amplifier to connect directly to the factory radio without requiring a line output converter. Additionally, the amplified system has adjustable bass boost and crossover controls that provide tuning flexibility, enabling users to adapt the sound to their personal preferences and achieve a custom audio experience.

The build quality of the Kenwood KAC-648 is notable, featuring a durable metal chassis that not only protects the internal components but also ensures longevity. The amplifier is designed to withstand the rigors of automotive environments, with features that guard against short circuits and overheating.

Another key aspect of the KAC-648 is its compact design, which allows for flexible installation options in various vehicle types. Due to its relatively small footprint, it can be mounted in tight spaces without sacrificing power or performance.

Overall, the Kenwood KAC-648 amplifier stands out in the competitive car audio market for its robust performance, versatility, and user-friendly features. Whether you are looking to simply enhance your vehicle's sound system or build a complete high-performance audio setup, the KAC-648 is an excellent choice that delivers exceptional value and quality.
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