AutoTek SM2-1000, SM4-800 manual Way active, or bi-amplified system with mono bass, Chassis Ground

SM4-800 / SM4-1000 / 4 CHANNEL AMPLIFIER APPLICATIONS

2 way active, or bi-amplified system with mono bass

This application shows how easily a 2 way active system can be implemented using a 4 channel amplifier. Channels 1 and 2 will be used for highs, and channels 3 and 4 for mono bass.

Interconnect cable checklist:

- We need to feed the same signal to both sets of channels, so must use 2 Y- adapters, one to feed the LEFT signal to channels 1 and 3, and the right signal to channels 2 and 4, as shown.

Mono bass woofer wiring:

-Connect the mono speaker positive terminal to the LEFT +, and its negative terminal to RIGHT -.

Switch setting checklist:

-1/2CH X-OVER: HP

-3/4CH X-OVER: LP

Channels 3/4:

-HI PASS (subsonic): 20 Hz

-LOW PASS: 100 Hz

Please note that these frequency points are suggestions only. Refer to the loudspeaker manufacturer specifications and the section “Setting up systems after installation for best performance”

Level control checklist:

Refer to the section “Setting up systems after installation for best performance”

Minimum final loudspeaker impedances:

-2-Ohms per channel in stereo mode.

-4-Ohms mono bridged.

Crossover frequency control checklist: Channels 1/2:

-HI PASS: 100 Hz

-LOW PASS: N/A

MONO

BASS

SPEAKER

STEREO

HIGHS

SPEAKERS

LEFT TO

CHANNELS

1 AND 3

RIGHT TO

CHANNELS

3 AND 4

	CH3/4		L
						LINE
	CH1/2					INPUT
	CH1		+ - g	HI I		CH3
	CH2		- +	UT	- +	CH4
	5V 0.2V		LEVEL		5V 0.2V	LEVEL
CHANNEL 1 / 2	0dB 12dB 60Hz 1.2KHz		BASS EQ HPF		0dB 12dB 60Hz 1.2KHz	BASS EQ HPF	CHANNEL 3 / 4
	30Hz 250Hz		LPF		30Hz 250Hz	LPF
	FULL LPF HPF		X-OVER	FULL LPF HPF		X-OVER
	LINE			CHANNEL	2 3 4	MODE
	OUTPUT	L			R

	OUTPUT	LEFT -+
	3/4 SPEAKER	IGHT+ -
	CH	-
FUSE
POWER INPUT	GND REM +12V
	OUTPUT	LEFT-
	½ SPEAKER	IGHT+ -
	CH	-
	POWER	PROTECT

BRIDGED

B IDGE

TO BATTERY + 12 Volts VIA FUSE REMOTE TURN-ON

CHASSIS GROUND

2 way active, or bi-amplified system with mono bass, and faded highs/lows

Here we present a variation of the previous system. Since this is a 2 way system, we can use the front outputs from a head unit to drive the highs, and the rear output to drive the bass This method allows the listener to easily adjust the relative levels of bass to highs, with the front to rear fade on the head unit.

Channels 1 and 2 will be used for highs, and channels 3 and 4 for mono bass.

Interconnect cable checklist:

-Use good quality RCA leads to connect the inputs of the amplifier to the source as shown.

-Follow the instructions as per the previous system for switch and crossover settings.

MONO	STEREO
BASS	HIGHS
SPEAKER	SPEAKERS

FULL RANGE

STEREO LINE

INPUTS

	CH3/4		L
						LINE
	CH1/2					INPUT
	CH		+ -	HI	-	CH3
	CH2		nd - +	PUT	nd - +	CH4
	5V 0.2V		LEVEL		5V 0.2V	LEVEL
CHANNEL 1 / 2	0dB 12dB 60Hz 1.2KHz		BASS EQ HPF		0dB 12dB 60Hz 1.2KHz	BASS EQ HPF	CHANNEL 3 / 4
	30Hz 250Hz		LPF		30Hz 250Hz	LPF
	FULL LPF HPF		X-OVER	FULL LPF HPF		X-OVER
	LINE			CHANNEL	2 3 4	MODE
	OUTPUT	L			R

	OUTPUT	LEFT -
	CH 3/4 SPEAKER	RIGHT+ -
FUSE
POWER INPUT	GND REM +12V
	OUTPUT	LEFT-
	½ SPEAKER	IGHT -
	CH	-
	POWER	PROTECT

BRIDGED

BRIDGED

TO BATTERY + 12 Volts VIA FUSE REMOTE TURN-ON

CHASSIS GROUND

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