Kenwood KAC-648 ■High-pass+ Subwoofer system, ■High-power 2-channelsystem, ■Tri-mode, ●Example:, 2CAUTION, Coil (L):, CENTER UNIT, CENTER UNIT, CENTER UNIT, Switch setting

System examples

■High-pass + Subwoofer system

				1.0		L	A
FILTER		OPERATION		0.5
OFF		STEREO	MONO(Lch)			R
HPF LPF				0.3	CENTER UNIT
			INPUT
			MIN	MAX
INPUT SELECTOR CONTROL	A		SENSITIVITY(V)			L
A B A	B						B
CONTROL				1.0		R
FILTER		OPERATION		0.5
OFF			(Lch)	MAX	Switch setting	L LINE
HPF LPF		STEREO	MIN
			MONO	0.3
			INPUT			R OUT
			SENSITIVITY(V)

L	(High pass)
R
BRIDGED	Subwoofer
	(L + R)
	(Bridged)

■High-power 2-channel system

				1.0		L	L	A
FILTER		OPERATION		0.5
OFF		STEREO	MONO(Lch)		CENTER UNIT		R
HPF LPF				0.3
			MIN	MAX
INPUT SELECTOR CONTROL	A		INPUT
			SENSITIVITY(V)				L
A B A	B					R		B
CONTROL		OPERATION		1.0			R
FILTER				0.5
OFF			(Lch)	MAX	Switch setting		L LINE
HPF LPF		STEREO	MIN
			MONO	0.3
			INPUT				R OUT
			SENSITIVITY(V)

BRIDGED BRIDGED

Left speaker

Right speaker

■Tri-mode

						1.0
	FILTER			OPERATION		0.5
	OFF			STEREO	MONO(Lch)
	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)
	HPF	LPF		STEREO	MONO	0.3
					MIN	MAX
					INPUT
					SENSITIVITY(V)

(High pass)

			C	L
	L	A	L
CENTER UNIT	R		R
	L	B
	R		C	L
Switch setting	L LINE		L
			R
	R OUT

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
	L		159000		frequencies. (High pass)
C
			C=		(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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