Kenwood KAC-PS500F System examples, Full-range 4-channel + Subwoofer system Tri-mode, Example

System examples

By combining the switches and functions of the KAC-PS500F, you can implement a wide range of audio system configurations.

■Full-range 4-channel + Subwoofer system

■Tri-mode

With the KAC-PS500F, a subwoofer can be added easily to the speaker system by marking use of the properties of coils and capacitors. This mode of operation is called Tri-mode.

	15Hz		CONTROL		A
				2
	OFF	25Hz			1
INFRASONIC				3		0.5
				4
100 100 120				(MIN) 5	0.2 (MAX)
		FILTER		INPUT
120150				SENSITIVITY(V)
70	150	OFF
	HPF		LPF	STEREO	MONO
70	170			OPERATION			A B	A
50 LPF 200
50 HPF	200
CONTROL			B				INPUT
2				15Hz			SELECTOR
	1		OFF 25Hz
3		0.5	INFRASONIC
4
(MIN) 5	0.2	(MAX)				120
INPUT				100 100 150
			FILTER 70		120
SENSITIVITY(V)						150
			OFF
STEREO	MONO		HPF	LPF
OPERATION				70		170
				50 LPF 200
				50	HPF	200

CENTER UNIT

L	A	L
		BRIDGED
	LINE IN
R		R

ΣSERVO Ι FEED BACK

L	B	L
		BRIDGED
	LINE IN
R		R
L	LINE OUT	Σ SERVO Ι

RA + B FEED BACK

L

LINE IN

R

Amplifier

Front speaker

Rear speaker

Subwoofer

			CONTROL		A						L
	15Hz										C
				2	1
	OFF	25Hz							A	L
				3				L
INFRASONIC						0.5			LINE IN	BRIDGED	C
				4
								R
				(MIN) 5	0.2 (MAX)					R
100 100 120
		FILTER		INPUT
120150				SENSITIVITY(V)
70	150	OFF						CENTER UNIT		Σ SERVO Ι
	HPF		LPF	STEREO	MONO						L
										FEED BACK
70	170			OPERATION			A B A		B		C
50 LPF 200										L
50 HPF	200							L
										BRIDGED	C
CONTROL			B				INPUT		LINE IN
								R
2				15Hz			SELECTOR			R
	1		OFF 25Hz
3		0.5	INFRASONIC					L	LINE OUT	Σ SERVO Ι
4
								R A + B		FEED BACK
(MIN) 5	0.2	(MAX)				120
				100 100 150
INPUT
			FILTER		120						Subwoofer
SENSITIVITY(V)						150
			OFF 70
STEREO	MONO		HPF	LPF						(High pass)	(L + R)
OPERATION
				70		170					(Bridged)
				50 LPF 200
				50	HPF 200

■High-pass (100 Hz) + Subwoofer (100 Hz) system

	15Hz		CONTROL		A
				2
	OFF	25Hz			1
INFRASONIC				3		0.5
				4
100 100 120				(MIN) 5	0.2 (MAX)
		FILTER		INPUT
120150				SENSITIVITY(V)
70	150	OFF
	HPF		LPF	STEREO	MONO
70	170			OPERATION			A B	A
50 LPF 200
50 HPF	200
CONTROL			B				INPUT
2				15Hz			SELECTOR
	1		OFF 25Hz
3		0.5	INFRASONIC
4
(MIN) 5	0.2	(MAX)				120
				100 100 150
INPUT
			FILTER 70		120
SENSITIVITY(V)						150
			OFF
STEREO	MONO		HPF	LPF
OPERATION				70		170
				50 LPF 200
				50	HPF	200

CENTER UNIT

L	A	L
		BRIDGED
	LINE IN
R		R

ΣSERVO Ι FEED BACK

L	B	L
		BRIDGED
	LINE IN
R		R
L	LINE OUT	Σ SERVO Ι

RA + B FEED BACK

(High pass)

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
0 dB			frequencies. (Low pass)
		Capacitor (C): Passes high frequencies and blocks low
-3 dB
				frequencies. (High pass)
L	C	C=	159000	(µF)
	Frequency		fc x R		fc=Cut of Frequency (Hz)
		L=	159 x R	(mH)	R=Speaker Impedance (	Ω	)
			fc

●Example:

When it is required to set a crossover frequency of 120 Hz using speakers with an impedance of 4 ohms.

■High-power 2-channel system

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

	15Hz		CONTROL		A
				2
	OFF	25Hz			1
INFRASONIC				3		0.5
				4
100 100 120				(MIN) 5	0.2 (MAX)
		FILTER		INPUT
120150				SENSITIVITY(V)
70	150	OFF
	HPF		LPF	STEREO	MONO
70	170			OPERATION			A B	A
50 LPF 200
50 HPF	200
CONTROL			B				INPUT
2				15Hz			SELECTOR
	1		OFF 25Hz
3		0.5	INFRASONIC
4
(MIN) 5	0.2	(MAX)				120
INPUT				100 100 150
			FILTER 70		120
SENSITIVITY(V)						150
			OFF
STEREO	MONO		HPF	LPF
OPERATION				70		170
				50 LPF 200
				50	HPF	200

CENTER UNIT

L	A	L
		BRIDGED
	LINE IN
R		R

ΣSERVO Ι FEED BACK

L	B	L
		BRIDGED
	LINE IN
R		R
L	LINE OUT	Σ SERVO Ι

RA + B FEED BACK

Left speaker

Right speaker

the coil rating should be as close as possible to 5.3 (mH).

2CAUTION

Be sure to connect a capacitor to the high-pass speaker. Failure to connect a capacitor will result in a drop of the combined impedance with the woofer.

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