SUB 550P - JBL Audio Service Manual (repair manual). Page 4

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

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