JBL S-412-P Service manual

5 (3)

STUDIO SERIES

S412P

4 - way POWERED SPEAKER SYSTEM

SERVICE MANUAL

JBL Consumer Products

250 Crossways Park Dr.

Woodbury, New York 11797

Rev 0 – 2/2000

- CONTENTS -

GENERAL SPECIFICATIONS………………...………………...………………..2 AMPLIFIER SPECIFICATIONS……………………………….……...…………..3 SET-UP GUIDE………..………………….…………………………..…..………..4 CONTROLS……………………………….……………..………………..………..6 TROUBLESHOOTING…………..…………………………...……..……………..7 MECHANICAL PARTS LIST………………………….…………………………..8 CABINET EXPLODED VIEW……………………………………………………..9 WIRING/PASSIVE SCHEMATIC DIAGRAMS……..……..……………………..10 AMPLIFIER EXPLODED VIEW………………..…..…...……….………………..11 BLOCK DIAGRAM…………………………………………………..…………….12 INTEGRATED CIRCUIT DRAWINGS………….…………..…………………....13 ELECTRICAL PARTS LIST……………………………….……………………….14 P. C. BOARDS……………………………..…………….……………………..…..17 SCHEMATICS…..………………..……………..……….…….…………….……..19 PACKAGING…………………………………………….……………………..…..22

S412P

GENERAL ACOUSTIC & ELECTRICAL SPECIFICATIONS

•	Nominal Impedance	8 ohms
•	Max Amp Power	250 watts*
•	Frequency Response	32Hz – 20kHz
•	Sensitivity	91 dB (1 watt @ 1 meter)
•	Crossover Frequency	200Hz, 850Hz, 3500Hz
•	Subwoofer Amplifier Output	200 watts

AURAL SWEEP TEST SPECIFICATIONS:
A. System Aural Sweep Test	6.0V	Input 20 Hz to 20 kHz
B. L.F. Aural Sweep Test	6.0V	Input 20 Hz to 500 Hz
C. M.B.F. Aural Sweep Test	5.0V	Input 100 Hz to 1 kHz
D. M.F. Aural Sweep Test	4.0V	Input 500 Hz to 4 kHz
E. H.F. Aural Sweep Test	2.83V Input 3 kHz to 20 kHz

PHYSICAL SPECIFICATIONS
Enclosure dimensions:	44 x 16 x 13 3/8” (H x W x D)
	1118 x 406 x 340mm
Weight	86lbs./39.1kg Each

*The maximum recommended amplifier power rating will ensure proper system headroom to allow for occasional peaks. We do not recommend sustained operation at these maximum power levels.

Occasional refinements may be made to existing products without notice but will always meet or exceed original specifications, unless otherwise stated.

PRODUCT: JBL S412P

S412P AMPLIFIER SPECIFICATIONS

LINE VOLTAGE	Yes/No	Hi/Lo Line	Nom.	Unit	Notes
US 120vac/60Hz	Yes	108-132	120	Vrms	Normal Operation
EU 230vac/50-60Hz	Yes	207-264	230	Vrms	Normal operation, MOMS required


			QA Test
Parameter	Specification	Unit	Limits	Conditions	Notes
Amp Section
Type (Class AB, D, other)	G	n/a	n/a		Class D Preferred...Sink required for Class AB
Load Impedance (speaker)	4	Ohms	n/a	Nominal	Z-curve required
Rated Output Power	150	Watts	130	1 input driven
THD @ Rated Power	0.1	%	1	22k filter
THD @ 1 Watt	0.3	%	0.5	22k filter
DC Offset	10	mV-DC	20	@ Speaker Outputs
					Measured at the speaker connector. 130 Watts
Damping factor	>150	DF	100	Measured at amplifier board	@ THD < 0.08 % @ 50 Hz
	>75		50	Measured at speaker cable

Input Sensitivity
Input Frequency	30	Hz	30	Nominal Freq.
LFE input	1.05	Vrms	±2dB	To 140 Watts
Speaker/Hi Level Input	23.66	Vrms	±2dB	To 140 Watts

Signal to Noise
SNR-A-Weighted	100	dBA	90	relative to rated power	A-Weighting filter
SNR-unweighted	70	dBr	70	relative to rated power	22k filter
SNR rel. 1W-unweighted	65	dBr	60	relative to 1W Output	22k filter
				Volume @max, using RMS reading
Residual Noise Floor	1	mVrms	5	DMM/VOM (or A/P)
				Volume @max, w/ A/P Swept
				Bandpass Measurement (Line
Residual Noise Floor	1.5	mVrms(max)	4	freq.+ harmonics)

Input Impedance
Line Input	20k	ohms	n/a	Nominal
Speaker/Hi Level Input	10k	ohms	n/a	Nominal

Filters
Speaker in LP 2nd order fixed	Fixed				See AP curves
Subsonic filter (HPF)					See AP curves
LFE Low pass 2nd order	Fixed			LFE input driven only	See AP curves

Limiter
THD at Max. Output Power	n/a	n/a	functional	Maximum Output Power	Maximum THD as a result of limiting.

Features	--
Auto - On selection switch	YES	--	functional		Refer to ATO section
LED On-Off switch	YES	--	functional		Dual LED indicator
Volume pot Taper (lin/log)	LOG	--	functional		A Taper

Input Configuration
Line In LFE	YES	--	functional		Single RCA jack
Spkr/Hi Level In	YES	--	functional

Signal Sensing (ATO)
Auto-Turn-On (yes/no)	YES		functional	Auto - on selection switch in Auto
ATO Input test frequency	30	Hz	functional	"
ATO Level LFE Input	4	mV	functional	"
ATO Level Speaker in	100	mV	functional	"
				Amp connected and AC on, then
ATO Turn-on time	5	ms	functional	input signal applied
				T before muting, after signal is
Auto Mute/ Turn-OFF Time	15	minutes	17	removed	Maximum

S P E A K E R C O N N E C T I O N S

CONNECTION TIPS

Speakers and electronics

amplifier and (–) on the

terminals have corre-

speaker to (–) on the

sponding (+) and (–)

amplifier. Wiring “out of

terminals. It is important to

phase” results in thin

connect both speakers

sound, weak bass and a

identically: (+) on the

poor stereo image.

speaker to (+) on the

SPEAKER-LEVEL CONNECTIONS

	RIGHT				LEFT
–	+			–	+
	–	+	–	+

Speaker Outputs

Your S412P speakers	right-front speaker	sound to all four
should be connected to	terminals on your receiver	transducers, and you
your receiver in two ways	or amplifier to the 5-way	should ALWAYS make
(at speaker level and line	binding posts on the back	these connections.
level) in order to achieve	of each S412P speaker.	If your receiver or
the best performance,	Remember to maintain the	amplifier does not	have a
especially when listening	correct polarities (“+” to	line-level subwoofer
to program material	“+” and “–” to “–”). The	output, then you do not
recorded in digital 5.1	S412P uses a red binding	need to make any other
formats, such as	post for “+” and black for	connections, and you
Dolby** Digital and DTS.®	“–”. These connections	should skip to the section
Connect the left-front and	will provide full-range	titled “Amplifier Controls.”

LINE-LEVEL CONNECTIONS

RECEIVER/AMPLIFIER

SUBWOOFER OUT

Y-Connector

(not included)

LEFT

RIGHT

LFE IN

LEFT S412P

RIGHT S412P

Each S412P speaker is also

effects that your favorite

two female connectors

equipped with a line-level

filmmakers intended.

to extension RCA patch

Low-Frequency Effects

You will need to use a

cords. Then plug each

(LFE/Subwoofer) input for

Y-Connector (not included)

patch cord into the

superior performance with

with one male connector

LFE/Subwoofer input of

digital 5.1 surround

and two female connectors

the left and right S412P

formats. The .1 LFE

to connect the line-level

speakers. Note: If your

channel contains

subwoofer output on your

receiver has separate

additional low-frequency

receiver/amplifier to the

left and right line-level

information not found in

LFE/Subwoofer inputs on

subwoofer (or LFE) output

the leftand right-front

the S412P speakers. Plug

jacks, you do not need to

channels. The LFE input

the male connector into

use a Y-Connector.

works with the full-range

the subwoofer output on

speaker-level input to

your receiver or amplifier,

provide the dynamics and

and connect each of the

AMPLIFIER CONTROLS

LFE Level Control: Allows

S412P. Now the level

you to adjust the volume of

control operates through-

the low-frequency effects/

out the entire bass

subwoofer channel to suit

spectrum below 80Hz, not

S412P

your room acoustics or

just within the .1 channel

tastes. However, it only

portion. This configuration is

LFE IN –

affects the LFE signal. If

generally unnecessary but,

LFE LEVEL

you are not using the LFE

in certain room-placement

input, the LFE level control

conditions, it allows greater

will not operate.

bass-level control.

Min

Max

Configuring Your Receiver:

Power Switches: The main

GREEN “ON”LED

You should choose the

“Power” switch is simply

“Large” or “Wide” option

marked “On” and “Off.”

OFF

for the leftand right-front

Turn this switch on to

POWER

ON/OFF

speakers so that full low-

commence operation of

MANUAL

frequency information will

the powered amplifier

AUTO

be sent to the S412P

after you have plugged the

OFF

speakers. Make sure that

power cord into an AC

This area is designed to become quite warm

during normal operation.

you also configure your

outlet. The second switch

CAUTION

DO NOT OPEN

RISK OF ELECTRIC SHOCK

receiver for “Subwoofer

is labeled “On/Off” and

DO NOT EXPOSE THIS APPLIANCE TO RAIN OR MOISTURE.”

“WARNING: TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK,

“AVERTISSEMENT: POUR PRÉVENIR LES RISQUES D’INCENDIE OU

On” or “LFE On.” In this

has two positions. Placing

PLUIE OU A L’HUMIDITE.”

DE CHOC ELECTRIQUE, EVITER D’EXPOSER CET APPAREIL A LA

case, the LFE/Subwoofer

the switch in the “Auto”

signal will consist only of

position puts the amplifier

the .1 (bass) channel. The

in Standby mode. In this

auto sensing by choosing

LFE signal level can be

mode the speaker will be

the auto position.

adjusted by using the

able to automatically

LED Indicators: When your

LFE level on the S412P

sense an incoming signal,

speaker is turned on but is

amplifier panel. For initial

which will trigger it to turn

not receiving a signal, the

setup, you should set the

fully on. The speaker will

LEDs glow red to let you

level controls on both

also automatically switch

know that your speaker is

speakers at minimum

itself back into Standby

plugged in. When the

(full counterclockwise

mode after approximately

speaker is receiving a

rotation). With 5.1 source

10 to 15 minutes have

signal, the LEDs glow

material playing, advance

passed without its sensing

green. We

have provided

the level controls on each

a signal. We recommend

convenient “Green ‘On’

speaker slowly until the

that you leave this switch

LED” switch on the back

desired amount of effects

in the “Auto” position for

panel to allow you to shut

channel is present. This

most applications. If you

off the front LEDs should

is a rather subjective

will be away from home or

they interfere with your

adjustment and should be

not using your speakers

enjoyment of a movie. This

made using a variety of

for an extended period of

switch has no effect when

program materials.

time, you should turn the

the LEDs are in red mode.

If you choose, you can use

speakers off by using the

main power switch. The

the “Small” or “Narrow”

Manual position will bypass

setting on your receiver.

the auto-sensing feature

In this case, all of the

and leave the amplifier on

information below 80Hz

until turned off with the

will be fed to the LFE/

main switch or returned to

Subwoofer input on the

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