Philips NTX600, Service Manual

Page: 25 / 45

Reference: WX-B-009-01 Title: Product Performance Specification
Model : NTX800 Page 23 of 25
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8 Mass Production Critical To Quality (MP CTQ)
8.1 Acoustics MP CTQs
Equipment and facilities
Acoustic Sec
ti
on
MP
CTQ
Check
frequency
Complete system:
on
e
u
ni
t
or [ma
in u
n
it + speaker box]
Speak
er bo
x
S
pe
ake
r
driver
Item to check
Requirement /
Specification Test condition /
description
Iso
lat
ion roo
m on pro
ductio
n l
in
e
Sile
nt roo
m
Acoustic meas
ure
me
n
t sy
s
te
m
s
Elec
tronics me
a
sure
m
ent sys
tem
R&B
mea
sure
m
en
t s
ys
te
m
Air lea
kag
e
me
as
u
re
me
n
t s
ys
te
m
Pola
ri
ty check
sy
s
te
ms
Woox
Specifie
d
CD
Device setting
Information
that needs to
be recorded,
with product
identification
number
YES
Sampling /
2pcs/hr
x
Acoustic
frequency
response
(SPL)
Within target
mask, both
speakers.
(compared with
approved
Reference
Samples
performance)
Measured on the
center of speaker
box, 1.0m, smoothed
1/3 octaves.
x x
Out of box
settings SPL curves
(or data).
YES Sampling /
2pcs/hr x
Acoustic
frequency
response
(SPL)
Within target
mask, both
speakers.
(compared with
approved
Reference
Samples
performance)
Measured on the
center of speaker
box, 1.0m, smoothed
1/3 octaves.
x x n/a
SPL curves
(or data).
YES Full
x
Acoustic
frequency
response
(SPL)
Within target
mask, both
speakers.
(compared with
approved
Reference
Samples
performance)
Measured on the
center of speaker
driver, in
measurement box on
production line,
0.5m, smoothed 1/3
octaves.
x n/a
SPL curves
(or data).
YES Full x
Rattling, Rub
and buzz
No any rub and
buzz noise from
drivers;
No any audible
rattling noise
from speaker
boxes.
Check with Philips
rattling check track at
maximum volume.
(30 seconds for
production, 1 minute
for QA)
x x x
Maximum
volume and
bass, strongest
powerful EQ
(Rock + DBB3)
Measurement
curve/value if
available
YES Full x
x
Rattling, Rub
and buzz
No any rub and
buzz noise from
drivers;
No any audible
rattling noise
from speaker
driver/LSB.
Sweeping with sine
wave, the power and
frequency range
refer to driver/LSB
spec.
x x n/a n/a
YES Full x
Air leakage
No audible air
leakage noise
from speaker
box.
Check with Philips
rattling check track at
maximum volume.
(30 seconds for
production, 1 minute
for QA)
x x x
Maximum
volume and
bass, strongest
powerful EQ
(Rock + DBB3)
Measurement
curve/value if
available
YES Full x
Air leakage
Meet the
requirement.
Acceptance
criteria refer to
driver/LSB
spec.
Measure the
impedance curve of
the speaker box
x n/a
IMP curves
(or data).
YES Full x
Polarity &
Channel
As specified, for
electrical
outputs and
speakers.
Check with Philips
Channel & Phase
check track (10
seconds for
production)
x x
Out of box
settings
n/a
YES Full x x
Polarity &
Channel As specified, for
speakers.
Polarity meter. x n/a n/a