JBL S-120-P Mk2 Service manual

StudioÔ Series

S120PII

Preliminary Service Manual

JBL Consumer Products

250 Crossways Park Dr.

Woodbury, New York 11797

- CONTENTS -

BASIC SPECIFICATIONS …………………..…………..1

DETAILED SPECIFICATIONS ……………..…………..2

CONNECTIONS………………………..……..…...…..…4

OPERATION ……..………………………...…….….…...7

BASIC TROUBLESHOOTING..…………………………8

S120PII AMPLIFIER BLOCK DIAGRAM……………….9

S120PII MECHANICAL/PACKING PARTS LIST….....10

P.C.B. DRAWINGS….…………………………….…….11

S120PII ELECTRICAL PARTS LIST ..…………….….13

S120PII SCHEMATICS………..…………………….….20

JBL S120PII SPECIFICATIONS

Amplifier Power (RMS): 400 Watts

Driver: 12" PolyPlas™ (polymer-coated cellulose

fiber)

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.

S120PII 300W Powered Sub/ Plate Amp

(

LINE VOLTAGE Yes/No Hi/Lo Line Nom. Unit Notes

Parameter Spec Unit Amp Section

Type (Class AB, D, other) D n/a n/a Load Impedance (speaker) 6 Ohms n/a Nominal

Rated Output Power 275 Watts 220 1 input driven 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

Damping factor >50 DF 23 Measured at amplifier 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

Residual Noise Floor 1 mVrms 2

Residual Noise Floor 1 mVrms

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

Limits Conditions Notes

Bridge type amplifier, None of the speaker terminals must be connected to system GND at any time.

Limiter prevents continuous power to exceed 220 Watts.

Measured at the speaker cable. 200 Watts, measured at speaker output terminals located at the amp board.

Volume @max, using RMS reading DMM/VOM (or A/P) Volume @max, w/ A/P Swept

max)2

Bandpass Measurement (Line freq.+ harmonics)

Input Impedance

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 Speaker out functional 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 Bass Q in YES 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 "

ATO Turn-on time 1 seconds functional

Auto Mute/ Turn-OFF Time 15 minutes 17

Line Input (L, R,LFE) 10K ohms n/a Nominal

Speaker/Hi Level Input 10K ohms n/a Nominal

-- functional Dual RCA jack functional 6.3m phono mono Jack

Amp connected and AC on, then input signal applied T before muting, after signal is removed

HP single order filter 180 Hz @ 8 Ohms, 90 Hz @ 4 Ohms load

Auto turn of time (T) must be 10 > T < 17 Minutes

Power on Delay time 3 sec. 4 AC Power Applied

Parameter Spec Unit

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

Stand-by Input Power 12 Watts 15 @ nom. line voltage Power Cons. @ rated power 400 Watts 400 @ nom. line voltage 250 Watts @ 6.0 Ohms nominal line voltage

QA Test

Limits Conditions Notes

Maximum allowable input power under nominal Input voltage and frequency, in stand-by mode (HOT or COLD operation).

Protection

Short Circuit Protection YES functional Direct short at output

Thermal Protection YES functional @1/8 max unclipped Power 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

Amplifier should resume operation after short circuit condition removal Temperature rise in accessible metal parts should not exceed 35K rise for domestic version or 30K rise for European versions

When we designed the S120PII powered subwoofer, our goal was to offer the user the best possible performance combined with the most flexible and complete installation options. Please look over the following three examples to determine which

description best matches your system and follow the corresponding hookup instructions.

To use the binding-post speaker terminals •ª with bare wire, unscrew the collar until the pass-through hole in the center post is visible

under the collar. Insert the bare end of the wire through the hole in the post, then screw the collar back down until the connection is tight. The holes in the center of the collars are intended for banana-type connectors.

Dolby* Pro Logic* (Non-Digital) – Speaker Level

Use this installation method for Dolby Pro Logic applications (not Dolby Digital, DTS®or other digital processing), where the receiver/processor does not have a subwoofer output or a volume-controlled preamp (line-) level output:

If your receiver features bass management capabilities that require you to configure your speaker settings, make sure to set your left- and right-front speakers to “LARGE”.

Connect your receiver or amplifier’s front left and right speaker terminals to the left

and right terminals on the subwoofer that are marked “High Level In” •. Connect the left and right terminals on the subwoofer that are marked “High Level Out” ª to the corresponding terminals on the back of your front left and right speakers.

Connect your receiver or amplifier’s center, left and right surround-speaker terminals to the corresponding terminals on the back of your center, left and right surround speakers.

SPEAKER CONNECTION

Left Front

+ –

Left Front Center

+ – + –

Left Surround

+ –

Center

+ –

Subwoofer

+ –

Receiver

HIGH LEVEL

HIGH LEVEL OUT`

Right Front

Right Surround

Right SurroundLeft Surround

Right Front

+ –

•

Dolby Pro Logic (Non-Digital) – Line Level

Use this installation method for Dolby Pro Logic applications (not Dolby Digital, DTS or other digital processing), where the receiver/processor is equipped with a subwoofer output or a volume-controlled preamp (line-) level output:

Use RCA-type patch cords to connect the line-level subwoofer outputs on your receiver or amplifier to the Line Level inputs ¶ on the subwoofer. IMPORTANT: Make sure that the LFE toggle switch ™ on the subwoofer is

in the “Normal” position. Do not use the “LFE” position with Dolby Pro Logic-only processors.

Note: If your receiver or amplifier only has one subwoofer output jack, then you may connect the subwoofer output on your receiver/preamplifier to either the left or right Line Level input ¶ on the subwoofer. It makes no difference which jack you choose.

Connect each speaker to the corresponding speaker

terminals on your receiver or amplifier.

Make sure your receiver or processor is configured correctly: Make sure that the subwoofer is configured as “On.”

Note for advanced users: If your receiver/processor has a built-in low-pass crossover filter for the subwoofer output, then the LFE switch

™ should be set to the “LFE” position to bypass the subwoofer’s internal crossover.

Subwoofer

Out

RECEIVER

L R

HIGH

LEVEL

HIGH

LEVEL

OUT

+ –

IN OUT R L

CROSSOVER FREQUENCY

BASSQ

(See owner’s

manual

before use)

LINE

LEVEL IN

(For LFE

use R or L)

LEVEL

PHASE AUTO

50Hz

80Hz

180°0°LFE

NORMALONOFF

150Hz

MIN

MAX

¢ ∞

§ ¶

•

™

Dolby Digital or DTS (or Other Digital Surround Mode) Connection

Use this installation method for Dolby Digital, DTS or other digital surround processors:

IMPORTANT: Make sure that the LFE toggle switch ™ on the subwoofer is in the “LFE” position. Use the Line Level input jacks ¶ for the LowFrequency Effects channel. Connect these jacks to the LFE output or subwoofer output on your receiver or amplifier.

Note: If your receiver or amplifier has only one subwoofer output jack, then you may connect the subwoofer output on your receiver/preamplifier to either the left or right Line Level input ¶ on the subwoofer. It makes no difference which jack you choose.

Connect each speaker to the corresponding speaker terminals on your receiver or amplifier.

Make sure that you have configured your surround sound processor for “Subwoofer On” or “LFE On.” The front left, front right, center and rear speakers should be set to “Small” or “Large” depending on their size and frequency response. Consult your receiver’s or processor’s owner’s manual.

HIGH

LEVEL

HIGH

LEVEL

OUT

+ –

IN OUT R L

CROSSOVER FREQUENCY

BASSQ

(See owner’s

manual

before use)

LINE

LEVEL IN

(For LFE

use R or L)

LEVEL

PHASE AUTO

50Hz

80Hz

180°0°LFE

NORMALONOFF

150Hz

MIN

MAX

¢ ∞

•

™

Subwoofer Output/LFE

RECEIVER/PREAMPLIFIER

The jacks marked “BassQ” § are for use with the JBL BassQ bass equalization module that will be released in the near future. The BassQ will enable you to optimize

your system’s bass response by equalizing the output of multiple subwoofers to best match your listening environment.

DO NOT con-

nect these jacks to any other

device. Do not use the BassQ jacks § without having first read the BassQ owner’s manual.

BassQ™Jacks

OPERATION

The S120PII is equipped with both a master Power switch ‚ and an Auto turn-on/turnoff switch £. In order to function, the S120PII must be plugged into an active electrical outlet (but not an accessories outlet on another component of your audio system such as a receiver), and the master Power switch ‚ must be turned on (the “•” position). The Auto turn-on/turn-off switch £ has three positions: On The subwoofer is on at

all times and ready to play program material.

Auto As long as no audio

signal is received, the subwoofer is in Standby mode to conserve power, indicated by the red color of the LEDs on the front of the unit. When an audio signal is sensed, the subwoofer will switch itself into the fully On mode and begin playing the program material. The LEDs will turn green. When a period of about twenty minutes goes by during which no signal is sensed, the S120PII will

return to Standby mode, indicated by the LEDs turning red.

Off The subwoofer is off at

all times, even if an audio signal is present

at its inputs. If you plan to be away for an extended time, or if the subwoofer will not be used, you may wish to turn off the master Power switch ‚.

The subwoofer Level Control ∞ adjusts the volume of the subwoofer relative to the rest of the system. Proper level adjustment depends on several variables such as

room size, subwoofer placement, type of main speakers and listener position. Adjust the subwoofer level so that the volume of the bass information is pleasing to you.

When using a Dolby Digital/ DTS receiver, adjust the LFE level on the receiver to 0dB, and then adjust the subwoofer Level Control ∞ for the 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

the LFE switch

™ is in the

“LFE” position.

Level Control

Power

™

180°0°LFE

PHASE AUTO

NORMALONOFF

80Hz

CROSSOVER

FREQUENCY

BASSQ

(See owner’s

manual

before use)

50Hz

IN OUT R L

∞

•

150Hz

+ –

LEVEL

MAX

MIN

HIGH LEVEL

LINE LEVEL IN (For LFE

use R or L)

OUT

S120P

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.

‚

OFF

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