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HASIB'S ARTICLES AND AUDIO PROJECT REVIEWS
BLOCK DIAGRAM FOR MY HT SETUP Here I enclosed my HT setup block diagram. First is the source (ie CD, tape, tuner, LD etc). Still no DVD player available right now. For input selector I use external selector that contains four sets of stereo audio input terminal with video input. The AV processor I used didn't have that facility for it owns right. You want to know… ready…every commercial product using CMOS switches but they do have non-linearity's as well as a significant on resistance. For audio, the other limitation is a reduced dynamic range, since the maximum supply voltage is +/-7.5V. For video applications, the internal resistance will cause some loss of signal, and an impedance mismatch - neither is desirable. Archaic though it sounds, I still prefer mechanical switches, or relays if any form of electronic control is required. The second thing is AV processor that's contain every pre-amplifications for L,R main channel, center channel and L, R surround channel (it's actually mono that act like stereo). The processor I used is very old one from Kenwood model SS3300. It has Dolby Pro-Logic (DPL) and Dolby Stereo (Dolby 3-Stereo) capabilities with DSPs (Digital Surround Processing ie Hall, Movies). No Dolby Digital (AC-3) or even DTS capabilities included. On music I prefer to bypass mode. It's actually mean like a typical pre-amp stage. Just pre-amplifications on L and R channel, no more than that. On movies I prefer DPL mode or Dolby Stereo off course. I never ever listen to DSP mode because it never sounded right to my ears…. that's personal. The SS3300 has internal built-in power amps for center and surround speakers but I use it pre-out. No subwoofer output available on this unit. The only beauty on this product is it sound natural on music and the construction is quiet OK too. I hook up the left and right pre-out from AV processor to active crossover. Now wheres the diagram looks quiet different. The high output connected to tweeter power amps, the mid output connected to midrange power amps and low output connected to bass power amps. The low pre-outs connected to EAS sub controller inputs. Remember my subwoofer is in stereo mode, left and right channel. The EAS sub outputs connected to their power amps respectively. The pre-outs for center and surround channels goes directly to their power amps. No active crossover available between the connections. Oh the speakers off course, the hi, mid and low speaker output connected to tweeter, midrange and woofer (tri-amped). Center and surround speaker output connected to center and surround speakers. I used passive crossover on center and surround speakers. For center speaker the passive crossover is quiet complex, it is 2-way 12dB/octave that's contain L-pad attenuator/series compensation network for tweeter and a zobel network for mid/woofers. For surround channel I just use that nice 2-way 6-dB octave passive. There are no passive crossover available on subwoofers - I used EAS sub controller. I have used baffle step compensation network before that connected between processor and active crossover but in my case its actually not needed. Balancing on the sound is good without it - placements for my main speakers confirmed that. For interconnects I used 75-ohm coaxial cable - it actually for aerial/antenna. No exotic interconnects available in my connections. The connectors used medium quality RCA sockets. For speaker wires used medium quality medium gauge and again no exotic or elephant trunk speaker wire type available in my setup. Want to know more the truth about cables and interconnect. Go to ESP Page www.sound.au.com on audio articles. Author Muhammad Hasib Md. Nor 2002 Any Comment And Question Email to : hasib_tangkak@yahoo.com
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