Harman Kardon HKSUB 12, Service Manual

HK SUB12

150W Powered Amplifier

LINE VOLTAGE

Yes/No

Hi/Lo Line

Unit

Notes

US 120vac/60Hz

Yes

108-132

Vrms

Normal Operation

Parameter

Specification

Unit

QA Test Limits Conditions

Notes

Amp Section

Type (Class AB, D, other)

D D 

n/a

Load Impedance (speaker)

4 Ohms

n/a

Nominal

Rated Output Power

150 Watts

150

1 input driven

THD@ Rated Power

0.08 %

1

22k filter

THD @ 1 Watt

0.15 %

0.5

22k filter

DC Offset

5 mV-DC

30

@ Speaker Outputs

Damping factor

>100 DF

30

Measured at speaker terminals, Output 

power 140 Watts THD 0.1 %

Input Sensitivity

Input Frequency

50 Hz

NA

Nominal Freq.

1 input driven

Line Input (L&R)

220 mVrms

±2dB

To Rated Power

1 input driven

LFE (Sub) Input

220 mVrms

±2dB

To Rated Power

LFE input driven only

Speaker/Hi Level Input

2.2 Vrms

±2dB

To Rated Power

(-20 dB below Line In)...1 input driven

Signal to Noise

SNR-A-Weighted

100 dBA

85

rel. to rated power

A-Weighting filter

SNR-unweighted

90 dBr

80

rel. to rated power

22k filter

SNR @ 1W-unweighted

65 dBr

60

rel. to 1W Output

22k filter

Residual Noise Floor

1.2 mVrms

3.0

Volume @max, using RMS reading 

DMM/VOM (or A/P)

Residual Noise Floor

0.8

mVrms(max)

2.0

Volume @max, w/ A/P Swept Bandpass 

Measurement (Line freq.+ harmonics)

Input Impedance

Line input L&R , LFE (Sub)

10 K ohms

n/a

Nominal

Speaker/Hi Level Input

4.7 K ohms

n/a

Nominal

Filters

Left & Right Low Pass fixed

130 Hz

--

±2dB

@ -3dB ref. 100Hz

LFE Low Pass fixed

220 Hz

--

±2dB

@ -3dB ref. 100Hz

Subsonic filter (HPF)

22 Hz

--

±2dB

@ -3dB ref. 100Hz

Limiter

YES

--

n/a

Features

LFE(Sub) Input

YES

functional 

BW Limited to 220 Hz

Volume pot Taper (lin/log)

log

--

functional 

ATO

YES

functional 

Signal Sensing (ATO)

ATO test Frequency

50 Hz

n/a

ATO Line Level

4.0 mV

2.0 - 8.0

2mV@50Hz into Line Input w/ 1 ch. 

driven

ATO Speaker level input

40 mV

20 - 80

50mV@50Hz into Line Input w/ 1 ch. 

driven

ATO Turn-on time

5 ms

functional

Amp connected and AC on, then input 

signal applied

Auto Mute/ Turn-OFF Time

15 minutes

10 - 25

T before muting, after signal is removed

Power on Delay time

3 sec.

functional

AC Power Applied

Transients/Pops

ATO Transient

5 mV-peak

10

@ Speaker Outputs

Turn-on Transient

50 mV-peak

100

@ Speaker Outputs

AC Line cycled from OFF to ON

Turn-off Transient

50 mV-peak

100

@ Speaker Outputs

AC Line cycled from ON to OFF

Efficiency

Stand-by Input Power

10 Watts

12

@ nom. line voltage

Maximum allowable  input power under 

nominal  Input voltage and frequency, HOT 

or COLD operation.

Power Cons.@rated power

230 Watts

250

@ nom. line voltage

150 Watts @ 4 Ohms nominal line voltage

Protection

Short Circuit Protection 

YES

--

functional

Direct short at output

Thermal Protection 

65 deg. C

--

functional

@1/8 max unclipped Power 

Temperature rise should not exceed 35K 

rise

DC Offset Protection

YES

--

functional

DC present at Speaker Out leads

Relay or crowbar (for driver/fire protection)

Line Fuse Rating

US Version

3.15 Amps

Type-T or Slo Blo

External fuse with UL/SEMKO rated holder

2

HKSUB12 

harman/kardon