|100,000yen(around the 1980 time)
The crossover network which thought [ that
multi-amplifier can be broadly enjoyed from two ways to four ways, and ] the
variegated functionality and the basic performance as important.
buffer amplifier of a main circuit has pure complimentary SEPP circuit
composition of ±2 powering with the low-noise transistor of a pair to which the
property was equal, and, thereby, is reducing the eventh higher-harmonic
Moreover, the Output load impedance was highly set up
for the input impedance low, and the influence of CR element of a filter is
Furthermore, the power source has eliminated the cross
interferencee between channels while it supplies the high voltage of +30V and
-22V and secures a large dynamic range by the voltage stabilizer which achieved
the right-and-left independency.
Multi-izing to four ways is possible
for a band splitting at four splittings of Low/Mid-Low/Mid-High/High.
cut-off frequency is the 11-point selection for every one-third octave,
respectively, and the high cut and the low cut have been independent.
level control of each band has adopted the attenuator type of a 1dB step.
The shutdown slope can choose three kinds, 6, 12, and 18 (dB/oct).
Although the attenuation in a crossing point of 6 dB/oct and 18 dB/oct is
-3dB, in 12 dB/oct, since it may have been piled by the property due to a phase
when it is made to cross by -3dB, only when it is 12dB / oct, it is considered
as a -6dB cross.
A low cut of a High position is removed in a slope change,
the flat position is altogether carried in it, and the multi-amplifier system
various type from two ways to four ways can be freely constituted by utilizing
this in it.
||Electronic crossover network
|Buffer amplifier part :
||Positive/negative 2 power-source Class-A
|Filter part :
||CR passive filter (6 dB/oct, 12 dB/oct)
CR active-filter +CR passive filter (18 dB/oct)
2, 3, 4 way possible
||Low (High Cut), Mid Low (Low Cut)
80, 100, 125, 160, 200, 250, 320, 400, 500 or 630Hz
Mid Low (High Cut), Mid
High (Low Cut) :
320, 400, 500, 630, 800, 1k, 1.25k, 1.6k, 2k, 2.5k, 3.5kHz
Mid High (High Cut), High (Low Cut) :
1.6k, 2k, 2.5k, 3.2k, 4k, 5k, 6k,
8k, 10k, 12.5k, 16kHz
||6 dB/oct, 12 dB/oct, 18dB / oct
||0--30dB (1dB step), -infinity, a
right-and-left channel independent variable
|Output load impedance
||1V, 10V (MAX)
|THD (20Hz - 20kHz)
||0.005% (1V output)
0.1% (10V output)
|Frequency characteristic (Low end/High end)
||10Hz/100kHz +0 -1dB
|SN ratio (output 1 V:00)
||100dB (IHF, A network, a short circuit)
|The semiconductor used
||Transistor: 71 pieces
(Electrical Appliance and Material Control Law)
||Power-switch un-interlocking.: One line
||Width 420x height 150x depth of 352mm