JBL S120PII User Manual

Studio™ Series

S120PII

Powered Subwoofer

Service Manual

JBL Consumer Products
250 Crossways Park Dr.
Woodbury, New York 11797	Rev3 2/2006

- CONTENTS -

BASIC SPECIFICATIONS …………….……..…………..1 DETAILED SPECIFICATIONS ……….……..…………..2 CONNECTIONS………………………...……..…...…..…4 OPERATION ……..………………….……...…….….…...7 BASIC TROUBLESHOOTING..…………………… ……8 BULLETIN JBL2003-06………..…………….………..….9 S120PII AMPLIFIER BLOCK DIAGRAM………………10 S120PII EXPLODED VIEW…………….…………….....11 S120PII TEST SET UP AND PROCEDURE….……....12 S120PII ELECTRICAL PARTS LIST ..……….…….….13 P.C.B. DRAWINGS….……………………………...…….20 S120PII IC/TRANSISTOR PINOUTS..……..….…….….22 S120PII SCHEMATICS………..…………….……….….23 S120PII PACKAGE……………………………………....27

JBL S120PII SPECIFICATIONS

Amplifier Power (RMS):	400 Watts
Driver:	12" PolyPlas™ (polymer-coated cellulose
	fiber) (4.4 ohms DCR)
Inputs:	Line Level (switchable to LFE), BassQ™ and
	Speaker Level
Outputs:	BassQ and Speaker Level (High-Pass)
Low-Pass Frequency:	Continuously variable from 50Hz – 150Hz
High-Pass Frequency:	150Hz when using speaker-level outputs
Frequency Response:	22Hz – Low-pass crossover setting
Dimensions (H x W x D):	17-3/16" x 16-3/16" x 18" (19" with grille)
(with feet, without spikes)	437 x 411 x 457mm (483mm with grille)
Weight:	56 lb/25.5kg

All features and specifications are subject to change without notice.

1

S120PII Studio Series

S120PII 300W Powered Sub/ Plate Amp

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	Spec	Unit	Limits	Conditions	Notes
Amp Section
					Bridge type amplifier, None of the speaker
					terminals must be connected to system GND at
Type (Class AB, D, other)	D	n/a	n/a		any time.
Load Impedance (speaker)	6	Ohms	n/a	Nominal
					Limiter prevents continuous power to exceed
Rated Output Power	275	Watts	220	1 input driven	220 Watts.
THD @ Rated Power	0.1	%	1	22k filter
THD @ 1 Watt	0.1	%	0.5	22k filter
DC Offset	10	mV-DC	60	@ Speaker Outputs
					Measured at the speaker cable. 200 Watts,
					measured at speaker output terminals located at
Damping factor	>50	DF	23	Measured at amplifier board	the amp board.
Input Sensitivity
Input Frequency	50	Hz	50	Nominal Freq.
L&R	425	mVrms	±2dB	To 200 Watts	Single input driven
LFE Mode selected	425	mVrms	±2dB	To 200 Watts	LFE Mode selected, single input driven
Bass Q Input	0.9	Vrms	±2dB	To 200 Watts	Single input driven
Speaker/Hi Level Input	5.5	Vrms	±2dB	To 200 Watts	Single input driven
Signal to Noise
SNR-A-Weighted	100	dBA	85	relative to rated power	A-Weighting filter
SNR-unweighted	90	dBr	85	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	2	DMM/VOM (or A/P)
				Volume @max, w/ A/P Swept
				Bandpass Measurement (Line
Residual Noise Floor	1	mVrms(max)	2	freq.+ harmonics)
Input Impedance
Line Input (L, R,LFE)	10K	ohms	n/a	Nominal
Speaker/Hi Level Input	10K	ohms	n/a	Nominal
Filters
LP 4th order fixed	50-150	Hz	± 10		2nd order variable and 2nd order fixed
Subsonic filter (HPF) 3rd Order	Fixed
LFE Low pass 2nd order	Fixed	Hz	± 10	LFE input driven only
Limiter
THD at Max. Output Power	YES	n/a	functional	Maximum Output Power
Features	--
Auto - On -Off switch	YES	--	functional		Refer to ATO section
Phase switch	0-180	deg	functional
Volume pot Taper (lin/log)	LOG	--	functional		A Taper
Variable crossover 50-150 Hz	YES		functional
					HP single order filter 180 Hz @ 8 Ohms, 90 Hz
HP Speaker out			functional		@ 4 Ohms load
LFE -Normal Select switch	YES	--	functional		Disables LP filter, intended for LFE
BassQ Input	YES		functional		6.3mm Phono Jack
BassQ Output	YES		functional		Bypass, loop-through - Designed for daisy chain
Input Configuration
Line In (L,R) & LFE	YES	--	functional		Dual RCA jack
Bass Q in	YES		functional		6.3m phono mono Jack
Spkr/Hi Level In	YES	--	functional		Binding post connector L&R
Signal Sensing (ATO)
Auto-Turn-On (yes/no)	YES		functional	Auto - on selection switch in Auto
ATO Input test frequency	50	Hz	functional	"
ATO Level LFE Input	2	mV	functional	"
ATO Level Speaker in	50	mV	functional	"
ATO Level Bass Q input	2	mV	functional	"
				Amp connected and AC on, then
ATO Turn-on time	1	seconds	functional	input signal applied
				T before muting, after signal is	Auto turn of time (T) must be 10 > T < 17
Auto Mute/ Turn-OFF Time	15	minutes	17	removed	Minutes
Power on Delay time	3	sec.	4	AC Power Applied

2

S120PII Studio Series

			QA Test
Parameter	Spec	Unit	Limits	Conditions	Notes
Transients/Pops
ATO Transient	5	mV-peak	n/a	@ Speaker Outputs
Turn-on Transient	50	mV-peak	2v-pp	@ Speaker Outputs	AC Line cycled from OFF to ON
Turn-off Transient	50	mV-peak	2v-pp	@ Speaker Outputs	AC Line cycled from ON to OFF
Efficiency
Efficiency	70	%	65	Rated power	Nominal Line voltage 120 VAC
					Maximum allowable input power under nominal
					Input voltage and frequency, in stand-by mode
Stand-by Input Power	12	Watts	15	@ nom. line voltage	(HOT or COLD operation).
Power Cons. @ rated power	400	Watts	400	@ nom. line voltage	250 Watts @ 6.0 Ohms nominal line voltage
Protection
					Amplifier should resume operation after short
Short Circuit Protection	YES		functional	Direct short at output	circuit condition removal
					Temperature rise in accessible metal parts
					should not exceed 35K rise for domestic version
Thermal Protection	YES		functional	@1/8 max unclipped Power	or 30K rise for European versions
DC Offset Protection	YES		-	DC present at Speaker Out leads	Relay or crowbar (for driver/fire protection),
Line Fuse Rating
USA-Domestic	4	Amps		Type-T or Slo Blo-250 V
EU	2	Amps		Type-T or Slo Blo-250 V	Internal fuse with UL/SEMKO rated holder

3

S120PII Studio Series

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

	When we designed the	description best matches	under the collar. Insert the
	S120PII powered subwoofer,	your system and follow the	bare end of the wire through
	our goal was to offer the user	corresponding hookup	the hole in the post, then
	the best possible performance	instructions.	screw the collar back down
	combined with the most	To use the binding-post	until the connection is tight.
	flexible and complete		The holes in the center of the
		speaker terminals •ª with
	installation options. Please		collars are intended for
		bare wire, unscrew the collar
	look over the following three		banana-type connectors.
		until the pass-through hole in
	examples to determine which
		the center post is visible

Dolby* Pro Logic* (Non-Digital) – Speaker Level				Left Front				Center		Right Front
				+	–				–	+	–
								+
Use this installation method			and right terminals on the
for Dolby Pro Logic appli-			subwoofer that are marked				Subwoofer
cations (not Dolby Digital,			“High Level In” •. Connect						L L
DTS	®	or other digital	the left and right terminals on								•
									LEVEL
									HIGH
processing), where the			the subwoofer that are						IN
							+	–	R R
receiver/processor does not			marked “High Level Out” ª						L
											ª
have a subwoofer output or			to the corresponding						LEVEL
									HIGH
a volume-controlled preamp			terminals on the back of your						OUT`
									R
(line-) level output:			front left and right speakers.
If your receiver features bass			Connect your receiver or					Receiver
					Left Front			Center		Right Front
management capabilities that			amplifier’s center, left and		+	–		+	–	+	–
require you to configure your			right surround-speaker
speaker settings, make sure			terminals to the corre-		Left Surround					Right Surround
to set your leftand right-front			sponding terminals on the		+	–				+	–
speakers to “LARGE”.			back of your center, left and
Connect your receiver or			right surround speakers.		Left Surround					Right Surround
					+	–				+	–
amplifier’s front left and right
speaker terminals to the left

4

S120PII Studio Series

Dolby Pro Logic (Non-Digital) – Line Level

Use this installation method

in the “Normal” position. Do

terminals on your receiver or

for Dolby Pro Logic appli-

not use the “LFE” position

amplifier.

cations (not Dolby

Digital, DTS

with Dolby Pro Logic-only

Make sure your receiver or

or other digital

processing),

processors.

processor is configured cor

-

where the receiver/processor

Note: If your receiver or

rectly: Make sure that the sub-

is equipped with a subwoofer

amplifier only has one

woofer is configured as “On.”

output or a volume-controlled

subwoofer output jack,

Note for advanced users: If

preamp (line-) level output:

then you may connect the

your receiver/processor has

Use RCA-type patch cords

subwoofer output on your

a built-in low-pass crossover

to connect the line-level

receiver/preamplifier to either

filter for the subwoofer output,

subwoofer outputs on your

the left or right Line Level

then the LFE switch ™ should

receiver or amplifier to the

input ¶ on the subwoofer. It

be set to the “LFE” position to

Line Level inputs ¶ on the

makes no difference which

bypass the subwoofer’s

subwoofer. IMPORTANT:

jack you choose.

internal crossover.

Make sure that the LFE toggle

Connect each speaker to the

switch ™ on the subwoofer is

corresponding speaker

¡ ™ £

180

°

LFE

ON

PHASE

AUTO

0°

NORMAL

OFF

¢

RECEIVER

80Hz

Subwoofer

CROSSOVER

LEVEL

∞

FREQUENCY

Out

L

R

50Hz

150Hz

MIN

MAX

§

LINE

¶

BASSQ

LEVEL IN

(See owner’s

(For LFE

manual

IN

OUT

R

L

use R or L)

before use)

L

HIGH

•

LEVEL

IN

R

+

–

L

HIGH

ª

LEVEL

OUT

R

5

S120PII Studio Series

Dolby Digital or DTS (or Other Digital

Surround Mode)

Connection

Use this installation method

Note: If your receiver or

Make sure that

you have

for Dolby Digital, DTS or other

amplifier has only one

configured your

surround

digital surround processors:

subwoofer output jack,

sound processor

for

IMPORTANT: Make sure that

then you may connect the

“Subwoofer On”

or “LFE On.”

the LFE toggle switch ™ on

subwoofer output on your

The front left, front right,

receiver/preamplifier to either

center and rear speakers

the subwoofer is in the “LFE”

the left or right Line Level

should be set to “Small” or

position. Use the Line Level

input ¶ on the subwoofer. It

“Large” depending on their

input jacks ¶ for the Low-

makes no difference which

size and frequency response.

Frequency Effects channel.

Connect these jacks to the

jack you choose.

Consult your receiver’s or

processor’s owner’s manual.

LFE output or subwoofer

Connect each speaker to the

output on your receiver or

corresponding speaker

amplifier.

terminals on your receiver or

amplifier.

¡ ™ £

180

°

LFE

ON

PHASE

AUTO

0°

NORMAL

OFF

¢

RECEIVER/PREAMPLIFIER

CROSSOVER

80Hz

LEVEL

∞

FREQUENCY

Subwoofer

50Hz

150Hz

MIN

MAX

§

Output/LFE

LINE

¶

BASSQ

LEVEL IN

(See owner’s

(For LFE

manual

IN

OUT

R

L

use R or L)

before use)

L

HIGH

•

LEVEL

IN

R

+

–

L

HIGH

ª

LEVEL

OUT

R

BassQ

™ Jacks

The jacks marked “BassQ” §

your system’s bass response

device. Do not use the BassQ

are for use with the JBL

by equalizing the output of

jacks § without having first

BassQ bass equalization

multiple subwoofers to

read the BassQ owner’s

module that will be released

best match your listening

manual.

in the near future. The BassQ

environment. DO NOT con-

will enable you to optimize

nect these jacks to any other

6

S120PII Studio Series

					O P E R A T I O N
			Power
			The S120PII is equipped with			Auto As long as no audio	return to Standby mode,
			both a master Power switch			signal is received, the	indicated by the LEDs
			‚ and an Auto turn-on/turn-			subwoofer is in Standby	turning red.
			off switch £. In order to			mode to conserve	Off The subwoofer is off at
			function, the S120PII must			power, indicated by the	all times, even if an
			be plugged into an active			red color of the LEDs on	audio signal is present
			electrical outlet (but not an			the front of the unit.	at its inputs.
			accessories outlet		on another	When an audio signal is	If you plan to be away for an
			component of your		audio	sensed, the subwoofer	extended time, or if the
			system such as a		receiver),	will switch itself into the	subwoofer will not be used,
			and the master Power switch			fully On mode and begin	you may wish to turn off the
			‚ must be turned on			playing the program	master Power switch ‚.
			(the “•” position).			material. The LEDs will
			The Auto turn-on/turn-off			turn green. When a
			switch £ has three positions:			period of about twenty
			On The subwoofer is on at			minutes goes by during
			all times and ready to			which no signal is
			play program material.			sensed, the S120PII will
		Level Control
			The subwoofer Level Control			room size, subwoofer	When using a Dolby Digital/
			∞ adjusts the volume of the			placement, type of main	DTS receiver, adjust the LFE
			subwoofer relative to the rest			speakers and listener position.	level on the receiver to 0dB,
			of the system. Proper level			Adjust the subwoofer level so	and then adjust the subwoofer
			adjustment depends on			that the volume of the bass	Level Control ∞ for the
			several	variables such as		information is pleasing to you.	desired amount of bass.

Crossover Adjustments

The Crossover Frequency Control ¢ determines the highest frequency at which the subwoofer reproduces sounds. If your main speakers can comfortably reproduce some low-frequency sounds, set this control ¢ to a lower frequency setting, between

50Hz – 100Hz. This will concentrate the subwoofer’s efforts on the ultradeep bass sounds required by today’s films and music. If you are using smaller bookshelf speakers that do not extend to the lower bass frequencies, set the low-pass Crossover

control ¢ to a higher setting,

between 120Hz – 150Hz. This control ¢ is not used when

¡ ™ £

		180°	LFE	ON
	PHASE			AUTO
		0°	NORMAL	OFF
		80Hz
¢	CROSSOVER				LEVEL
	FREQUENCY
∞	50Hz	150Hz	MIN	MAX
§	BASSQ				LINE
					LEVEL IN
	(See owner’s				(For LFE
	manual	IN	OUT	R	use R or L)
¶	before use)				L
				L
•					HIGH
					LEVEL
					IN
				R
		+	–
				L
ª					HIGH
					LEVEL
					OUT
				R

the LFE switch ™ is in the “LFE” position.

S120PII

CAUTION

RISK OF ELECTRIC SHOCK

DO NOT OPEN

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

DO NOT EXPOSE THIS APPLIANCE TO RAIN OR MOISTURE.

AVERTISSEMENT: POUR PRÉVENIR LES RISQUES D’INCENDIE OU

DE CHOC ÉLECTRIQUE ÉVITER D’EXPOSER CET APPAREIL A LA

PLUIE OU A L’HUMIDITÉ.

ON

‚

OFF

7

S120PII Studio Series
				Phase Control
				subwoofer placement and			you happen to rearrange your
							listening room and move
				listener position. Adjust the
				Phase switch ¡ to maximize			your speakers, you should
				bass output at the listening			experiment with the Phase
				position.			switch ¡ in both positions,
		The Phase Control ¡		Remember, every system,			and leave it in the position
		determines whether the		room and listener is different.			that maximizes bass
		subwoofer’s piston-like action		There are no right or wrong			performance.
		moves in and out in phase		settings; this switch ¡ offers
		with the main speakers or		the added flexibility to adjust
		opposite the main speakers.		your subwoofer for optimum
		There is no correct or		performance for your specific
		incorrect setting. Proper		listening conditions without
		phase adjustment depends on		having to move your speakers.
		several variables such as		If at some time in the future

	T R	O U B L E S H O O T I N G
	If you used the High Level		If there is low (or no) bass	If you used the		Line Level
	(speaker) inputs • and there		output:	inputs ¶ and there is no
	is no sound from any of the		• Make sure the connections	sound from the subwoofer:
	speakers:
			to the left and right “Speaker	• Check that receiver/amplifier
	• Check that receiver/amplifier		Inputs” • have the correct	is on and a source is playing.
	is on and a source is playing.		polarity (+ and –).	• Check that powered
	• Check that powered		• Make sure that the	subwoofer is plugged into an
	subwoofer is plugged into		subwoofer is plugged into an	active electrical outlet and
	an active electrical outlet		active electrical outlet and	that both Power switches
	and is switched on £‚.		that both power switches	are on £‚.
	• Check all wires and		are on £‚.	• Check all wires and con-
	connections between		• Adjust the Crossover point	nections between receiver/
	receiver/amplifier and		¢.	amplifier and subwoofer.
	speakers. Make sure all wires		• Flip the Phase Control	Make sure all wires are
	are connected. Make sure		switch ¡ to the opposite	connected. Make sure none
	none of the speaker wires		position.	of the wires are frayed, cut
	are frayed, cut or punctured.		• If you are using a Dolby	or punctured.
	Make sure no wires are		Digital/DTS receiver or	• Review proper operation of
	touching other wires or		processor, make sure that the	your receiver/amplifier.
	terminals and creating a		subwoofer adjustments on	• Slowly turn the Level
	short circuit.		the receiver/processor are	Control ∞ clockwise until
	• Review proper operation		set up correctly. When using	you begin to hear the desired
	of your receiver/amplifier.		the S120PII’s Speaker Level	amount of bass.
			inputs •, you should set your	• Make sure that you have
			receiver to configure the	configured	your	receiver/
			main left and right speakers	processor	so that the
			as “LARGE”.	subwoofer/LFE output is on.
			• Slowly turn the Level
			Control ∞ clockwise until
			you begin to hear the desired
			amount of bass.
			8