Kenwood KAC-648 System examples, Switch setting, Principle of Tri-mode, impedance of 4 ohms

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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