JBL GTH400-20107 manual GTH400 Block Diagram

	L IN	R IN	L IN	R IN	L OUT	IMAGEROUT		L OUT	R OUT
	1	1	2	2	1	ENH.	1	2	2
Preamp-level inputs	CH.	CH.	CH.	CH.	CH.		CH.	CH.	CH.

L	Buffer	+	∑
GR 1
R	Buffer		+ ∑
				1
				2
L	Buffer		+	∑

	GTH400 Block Diagram
	GR 1 MODE SWITCH
		1
1	LP	2	1
2	X-OVER	3
3			2
	HP		3
		❶	GR 1 L
			❷ PREOUT
1		1	1
2
3	LP	2	2
	X-OVER		3
			GR 1 R
	HP	3	PREOUT

Buffer

Buffer

1
2		BOOST
3
	❸
		BASS
1
2
3

AMP GR 1 Left Speaker Out

AMP GR 1 Right Speaker Out

GTH400-20107 06/03/98 15:49

			1
			2
GR 2
		+	GROUP 2
R	Buffer	∑	INPUT
			1 – GR 1
			2 – GR 2
L	Buffer
GR 3

		1	1
1	LP	2	2
	X-OVER	3
2
3	HP		3	GR 2 L
		❶		❷ PREOUT
	LP	1	1
		2
	X-OVER		2
		3
1			3
	HP			GR 2 R
2
3				PREOUT
		GR 2 MODE SWITCH

Buffer

Buffer

1

2

3

❸

1

2

3

BASS BOOST

AMP GR 2 Left Speaker Out

AMP GR 2 Right Speaker Out

Side 11

11

R	Buffer
Speaker-level		+	+	1	1
	inputs		∑	2
				3
L	+		+	1
				2
	Buffer	+	∑	3	GROUP 3
	-
					INPUT
GR 1					1 – GR 3
					2 – GR 2
	+				3 – GR 1+2
R	Buffer
	-
L	+
	Buffer
	-
GR 2
	+
	Buffer
R -

	1	1
	2	2
LP	3
		3
X-OVER	❶		GR 3 L
HP			PREOUT
	1		❷
	2	1
	3
LP		2
		3
X-OVER			GR 3 R
HP			PREOUT
Speaker	Preamp	❸Mode
❶Crossover	❷Crossover
1 – Flat	1 – Flat		1 – L
2 – Low Pass	2 – Low Pass		2 – Stereo
3 – High Pass	3 – High Pass		3 – L+R

Buffer

Buffer

1

2 3

❸

1

2

3 GR 3 Input Mode

BASS BOOST

AMP GR 3 Left Speaker Out

AMP GR 3 Right Speaker Out