Kenwood KAC-746 System examples, Full-range 4-channel+ Subwoofer system, Tri-mode, Switch setting

System examples

■Full-range 4-channel + Subwoofer system

Switch setting

CENTER UNIT

L

R

L

R

L

A

B

L

R L R

	100 80	100
		150	FILTER		OPERATION
	80
		150	OFF
		HPF		LPF
	50 LPF 200
	50 HPF	200
	FREQUENCY(Hz)				STEREO MONO(Lch)
						L+R
				CONTROL		A
A B	A					100 80 150 100
	OPERATION			FILTER		80
INPUT SELECTOR				OFF
						150
				HPF	LPF

A+B

RLINE OUT

Amplifier

■High-power 2-channel system

			50 LPF 200
			50 HPF 200
STEREO		MONO(Lch)	FREQUENCY(Hz)
	L+R

CONTROL B

Switch setting

CENTER UNIT

L

R

L

R

L

A

B

L

R L R

(Bridged)

(Bridged)

	100 80	100
		150	FILTER		OPERATION
	80
		150	OFF
		HPF		LPF
	50 LPF 200
	50 HPF	200
	FREQUENCY(Hz)				STEREO MONO(Lch)
						L+R
				CONTROL		A
A B	A					100 80 150 100
	OPERATION			FILTER		80
INPUT SELECTOR				OFF
						150
				HPF	LPF

A+B

RLINE OUT

■High-pass (80 Hz) + Subwoofer(80 Hz) system

			50 LPF 200
			50 HPF 200
STEREO		MONO(Lch)	FREQUENCY(Hz)
	L+R

CONTROL B

Switch setting

	L
CENTER UNIT		A
	R

L	(High pass)
R

100 80	100
	150	FILTER	OPERATION
80
	150 OFF
	HPF LPF
50 LPF 200
50 HPF	200

L

R

L

B

L	Subwoofer
R
	(L + R)
	(Bridged)

	FREQUENCY(Hz)	STEREO MONO(Lch)
			L+R
		CONTROL	A
A B	A		100 80 150 100
	OPERATION	FILTER	80
INPUT SELECTOR		OFF
			150
		HPF LPF

A+B

R LINE OUT

			50 LPF 200
			50 HPF 200
STEREO		MONO(Lch)	FREQUENCY(Hz)
	L+R

CONTROL B

■Tri-mode

CENTER UNIT

L

R

L

R

L

A

B

L

R

L

R

C L

C

C L

Switch setting

	100 80	100
		150	FILTER		OPERATION
	80
		150	OFF
		HPF		LPF
	50 LPF 200
	50 HPF	200
	FREQUENCY(Hz)				STEREO MONO(Lch)
						L+R
				CONTROL		A
A B	A					100 80 150 100
	OPERATION			FILTER		80
INPUT SELECTOR				OFF
						150
				HPF	LPF

A+B

RLINE OUT

C

		50 LPF 200
		50 HPF 200
STEREO	MONO(Lch)	FREQUENCY(Hz)
L+R

CONTROL B

●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.

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