| ...fabled... PIONEER D-70 Electronic Crossover   - translated from Japanese - The high pass filter section of the buffer amplifier the plus and minus 2 power source which is superior in high pass quality (±31V) has adopted the pure complimentary A class SEPP circuit. It denies the occasional several times distortion factor which occupies the large portion of the strain component by the complimentary circuit, low is operational in the strain. In addition, it has become the design which does not produce effect on the CR element of the filter by input impedance being high, makes output impedance low. The low-pass filter section makes 3 step constitution, the same plus and minus 2 power source as the high pass section (±31V) adopts the pure complimentary A class SEPP circuit to the first level. In addition, as for the next step similarly the first level differential single emitter output circuit of plus and minus 2 power source, as for the end step it has become constitution of the pure complimentary A class SEPP with the plus and minus 2 power source first level differential motion. The element whose loss such as styrol condenser of error 2% and leakage current is little is used to the condenser of the filter circuit, precision of frequency characteristic and the startup and crossover frequency of sound is raised. With position of the magnification ratio ×1, 11 places, considering the frequency which overlaps with position of the magnification ratio ×10, 21 kinds can choose cutoff frequency, with 1/3 octave marks. As for the cutoff slope with 12dB/oct, the attenuation - 80dB (at voltage linear has adopted the filter which possesses slope quality to 1/10000) or less. Because cutoff frequency change low-pass/is high pass independence, also it is possible to repeat the crossover of the signal to the woofer. For accurate level setting, level control 32 positions, has used the type of 1dB/step. Because the memory marker has been attached, one time moving the level which is set, it can reproduce original level accurately. In addition, when the network switch is turned to OFF, it can output the signal from the pre-amp that way in the low-pass Variable terminal. The EIA standard rack of the difference sale, on-board possible rack-mounted adapter has belonged to JA-R2S and JA-R1S (2U). If the adapter is removed, the 20th series and breadth reach the same size. 
AllegroSound (Est.1973) Los Angeles, California USA Rick@AllegroSound.com 
FOR SALE / TRADE 
HOME / master-index * AllegroSound et al assumes no responsibility in any way for the use or misuse of any products or services. |
 World-Wide Shipping |
AllegroSound world's finest audio systems Los Angeles, California USA 323.960.5014, 818.377.5264 © 2002~2007 AllegroSound |
> home <