Kenwood SP 820 Service Manual
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Extracted text from Kenwood SP 820 Service Manual (Ocr-read)
Page 1
KENWOOD
SERVICE MANUAL
MF'LYERS
moms "an." Law mam
EOO
oi.
EXTERNAL SPEAKER
Page 2
SP-820
SPEOIFIOATIONS/ FEATURES/ FILTER SELECTOR OIROUIT/
FILTER SWITCH OPERATIONS
SPECIFICATIONS
Speaker ............. 12 cm
Nominal max. Input ..... 2 W
Impedance ............ 8 9
Frequency Characteristic . .
100 Hz ~ 5 kHz
Filter Cut-off Frequency
LOW ............. 400 HZ / -3 dB
HIGH 1 ............ 3 kHZ / -3 dB
HIGH 2 ........... 1.5 kHZ/ -3 dB
Filter Attenuation ..... -6 dB/ Oct
Size ................ W 169 (169) mm
H 153 (167) mm
D 335 (348) mm
Figures in ( I are maxesizes includ-
ing projected parts.
Weight .............. 2.5 kg
FEATURES
1,
2.
Adoption of a graceful design which esthetically match-
es the T8820 series.
Installation of band selector filter (attenuation possible
by series insertion of L in high range and C in low
range).
Selection of 2 input systems (switching between IN-
PUT A and B).
Feasibility of monitoring voice with a head-phone,
after passing through the band-pass filter.
FILTER SELECTOR CIRCUIT
This speaker system is provided with a circuit which
offers a filter effect by the characteristics shown below.
400 Hz
1.5 kHZ 3 kHz
LOW HIGHZ HIGH1
Each filter switch offers the following functions:
FILTERS (LOW)
FILTER ON makes attenuation at 400 Hz and below
(400 Hz / #3 dB).
FILTERS (HIGH 1)
FILTER ON makes attenuation at 3 kHz and above
(1 kHz / 73 dB).
FILTERS (HIGH 2)
FILTER ON makes attenuation at 15 kHz and above
(1.5 kHz / -3 dB).
Combined use of these filter switches can make the
following frequency characteristics:
FILTER SWITCH OPERATIONS
1.
2.
3.
When LOW and HIGH 1 are pressed simultaneously,
the resultant frequency band is 400 Hz ~ 3 kHz,
When LOW and HIGH 2 are pressed simultaneously,
the frequency band is 400 Hz ~ 1.5 kHz.
When LOW, HIGH 1, and HIGH 2 are pressed simulta
neously, the frequency band is 400 Hz ~ 1.5 kHz,
Suggestions for practical filter operations are obtain-
able from "Use of Filter" in the instruction manual.