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SUB 550P / 230 

Amplifier/Subwoofer

 

 

SERVICE MANUAL

 
 
 
 

 

 
 
 
 

 

JBL Consumer Products 

8500 Balboa Blvd. 

 

            

Released 

2012          Rev0 

 

 

01/2012 

Discontinued XXXX 

 

 

 
 

 

 

 

Low-frequency transducer:  

 

10" (250mm) PolyPlas cone, cast basket 

Enclosure type:  

 

 

 

Sealed (forward-firing) 

Amplifier power:  

 

 

 

300 watts (RMS); 500 watts (peak) 

Frequency response:  

 

 

27Hz – 150Hz  

Audio controls:  

 

 

 

Volume level, crossover frequency, phase 

Connections:  

 

 

 

RCA line-level and LFE inputs 

Power requirement:  

 

 

120V, 60Hz (US); 220V – 230V, 50Hz/60Hz (EU) 

Power consumption:  

 

 

<6W (120V) standby 

360W (3.8A @ 120V) maximum 

<0.55W (230V) standby 

395W (2.1A @ 230V) maximum 

Dimensions (W x H x D):    

 

17-1/2" x 14-29/32" x 14-31/32"  

(44

4mm x 379mm x 380mm) 

Weight:  

 

 

 

 

50 lb (23kg) 

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

2

US 120vac/60Hz

Yes

108-132

120

Vrms

Normal Operation

EU 230vac/50-60Hz

Yes

207-253

230

Vrms

Normal operation, MOMS required

No

90-110

100

Vrms

Normal Operation

Type (Class AB, D, other)

D

n/a

n/a

Load Impedance (speaker)

4

Ohms

n/a

Nominal

AVG System impedance

10.8

Ohms

n/a

AP Computed BW from 20 to 500Hz Refer to AP Graph

Rated Output Power 

250

Watts

220

AVG Peak voltage 

45.8

Vpk

Reference 170mV driven into a single input

Average PK voltage,  3/20 Cycles 50 Hz, Driven 

6dB above its input sensitivity , rated impedance

THD @ Rated Power

0.5

%

1

22K filter+AUX-0025

THD @ 1 Watt

0.2

%

0.3

22K filter+AUX-0025

DC Offset

10

mV-DC

50

@ Speaker Outputs

Damping factor

>50

DF

20

Measured at amplifier board  90% of

full power

Measured at the speaker cable.  225 Watts @ 

THD < 0.1 % @ 50 Hz

Input Frequency

50

Hz

50

Nominal Freq.

L&R

5.6

mVrms

±1dB

To 1 Watt, Ap Zo=25

Single input driven

LFE input

5.6

mVrms

±1dB

To 1 Watt, Ap Zo=25

Single input driven, LFE switch ON

System Gain

51

dB

Reference

Single input driven Normal or LFE mode

SNR-A-Weighted

80

dBA

75

relative to 1W-Inputs terminated

A-Weighting filter

SNR-unweighted

70

dBr

65

relative to 1W-Inputs terminated

22K filter

Residual Noise Floor

<2.0 mVrms(max)

2.5

Volume @max, w/ A/P Swept 

Bandpass Measurement (Line 

freq.+ harmonics) (BW=20 KHz)

Line level inputs must be terminated using    

1KOHM

Line Input (L, R,LFE)

5.5K

ohms

n/a

Nominal

LP filter Variable

50-150 Hz

± 10

4th Order variable

Refer to AP curves 

Subsonic filter (HPF) 2nd Orde

Fixed

F=32Hz,Q=0.925

Refer to AP curves 

Friend circuit

Fixed

F=59Hz,Q=3.5, Av=-1dB

Refer to AP curves 

LFE Low pass 

Fixed

200>LP-LFE<500

Refer to AP curves 

THD at Max. Output Power

13

%

functional 

Drive unit 6dB above the required 

level to obtain full power 

Approximately 208mV

Maximum THD as a result of limiting.

--

Volume pot Taper (lin/log)

LOG

--

functional 

A Taper

Phase switch 

0-180

deg

functional 

LP Filter defeat switch

YES

functional 

Disables LP filter, LFE Mode

LED Indicator

YES

functional 

Bi-color LED loacated at the amplifier panel, Red

Standby, Green-On

Line In  (L,R) or LFE

YES

--

functional 

Dual  RCA jack, For LFE use L or R

Auto-Turn-On (yes/no)

YES

functional 

ATO Input test frequency

50

Hz

functional 

"

ATO Level LFE Input

2

mV

functional 

"

Maximum acceptable level.

ATO Turn-on time

5

ms

functional 

Amp connected and AC on, then 

input signal applied

Auto Mute/ Turn-OFF Time

5-15

minutes

5-15

T before muting, after signal is 

removed

Auto turn of time (T)   must be  5 > T < 15 

Minutes

3

sec.

4

AC Power Applied

ATO Transient

0.5

V-peak

0.5V

@ Speaker Output

Amplifier activated by signal presence at the 

Line input

Turn-on Transient

0.5

V-peak

0.8V

@ Speaker Output

AC Line cycled from OFF to ON

Turn-off Transient

0.5

V-peak

0.8V

@ Speaker Output

AC Line cycled from ON to OFF

3

120V
Efficiency

65

%

65

Test conducted at rated power 245WNominal Line voltage 

Efficiency at 1/8 of rated powe

52

%

50

Test conducted at 31.25 WRMS

Nominal Line voltage-Rated impedance 4 Ohms

Standby input power 120VAC

5.5

Watts

6.5

@ nom. line voltage 120VAC-60Hz Nominal Line voltage LED=>RED

Idle input power

11

Watts

13

@ nom. line voltage 120VAC-60Hz

Maximum allowable  input power under nominal  
Input voltage and frequency, HOT or COLD 
operation. LED GREEN no signal applied

Power Cons. @ rated power

358

Watts

384

@ nom. line voltage 120VAC-60Hz 250 Watts @ 4 Ohms nominal line voltage

Input Current @ rated power

3.8

ARMS

Reference @ nom. line voltage 120VAC-60Hz

230VAC
Efficiency

65

%

62.5

Test conducted at rated power 250WNominal Line voltage 

Efficiency at 1/8 of rated powe

52

%

50

Test conducted at 31.25 WRMS

Nominal Line voltage-Rated impedance 4 Ohms

Standby input power 230VAC

0.5

Watts

0.55

230VAC, 50-60Hz

Nominal Line voltage LED=>RED

Idle input power

15

Watts

16

@ nom. line voltage and Frequency

Maximum allowable  input power under nominal  
Input voltage and frequency, HOT or COLD 
operation. LED GREEN no signal applied

Power Cons. @ rated power

393

Watts

400

@ nom. line voltage and Frequency 250 Watts @ 4 Ohms nominal line voltage

Input Current @ rated power

2.14

ARMS

Reference @ nom. line voltage and Frequency

Short Circuit Protection 

YES

functional  Direct short at output

Amplifier should resume operation after short 
circuit condition removal 

Thermal Protection 

YES

functional

@1/8 max unclipped Power at 1.06 
times the input voltage

DC Offset Protection

YES

-

DC present at Speaker Out leads

Design must insure no Offset at the speaker 
output  under any operating condition including 
abnormal operation

Line Fuse Rating

USA-Domestic 3.15

Amps

3.15

EU

2.5

Amps

2.5

5x20mm Type-T-250 V, Low 
Breaking capacity

Transformer
Flux Density

<12.5

KGauss

n/a

@ Nom. line voltage

No Audible hum/buzz or excess idle current

Power losses

4.65

Watts

Reference

120VAC-60Hz

Magnetizing current

0.044

Amps

Reference RMS

120VAC-60Hz

All Agency Approvals

YES

n/a

Required per UL/CSA/SEMKO 
Standards

Refer to "Requirements" sheet

Other Parameters/Notes:
1. Limiter circuit response must be clean sounding with no apparent pops, noises, or pumping.
2. Plate dimensions not to exceed 11.81"H x 7.87"W and the plate must be airtight with no possibility of air leaks (plastic cover required).
3. Volume control should be at the input buffer stage  in order to lessen the possibility of clipping the input section with highly dynamic audio material.
4. ALL SPECS SHOULD BE MEASURED AT NOMINAL LINE VOLTAGE. 

Rev-00 July-12-2011, Eng-reference sample

4