I Build one amplifier using 2sa1943 and 2sc5200 transistors 200 watt . I have 10inch 4ohm 150watt woofer which is working fine now i am planning to install twitter in it so should I install it with passive 2 way crossover or just connect it parallelly ?
I had a 10" + 3" two way speaker, with one capacitor series the tweeter, and I tore the woofer internal leads. KLH23 and a ST70 35 w/ch tube amp. Really a 2 element crossover with a series inductor on the woofer is safer. The actual response curve of the woofer and tweeter depends on the crossover point you choose. You want to cross the woofer before cone breakup occurs, and you don't want to overdrive the tweeter where it cannot respond. Some CD tweeters can respond as low as 500 hz, most are just heating up below 2000 hz.
If you parallel the two and use no crossover, then you are wasting current producing heat where the transducers will not respond. They also could produce distortion when driven out of the proper frequency range.
6 db/octave crossovers can be one inductor and one capacitor. To get 12 db/octave you need 4 parts.
You could buy a packaged crossover from somebody like eminence or parts-extress, but really a couple of calculated parts on a board is a better deal. You know on individual parts how much energy you are wasting in winding resistance or capacitor ESR. You can include a tungsten bulb series the tweeter to prevent damage due to loud pops , mike feedback, or square wave source (crunch electric guitar).
Some people find bi-amping with a DSP producing the frequency filters before the two amps, cheaper these days than a passive crossover. Requires a cell phone to program the DSP, however. Wastes energy in the long term heating up two amplifiers on each speaker instead of one.
If you have one 2sa1943 and one 2sc5200 per channel, you have a 50 w amp instead of 200. If you used 30 v rails you might be able with a good heat sink to sustain 6 amps or 144 watts but more traditional 50 v rails cuts the dc SOA to 2 amps or 16 watts. AndrewT stated that DC soa predicted output transistor reliability. I find his rule predicts commercial practice of reliable class AB PA amps, although not the 3 second power ratings quoted on the cost cutter ebay/amazon/alibaba designs.
If you parallel the two and use no crossover, then you are wasting current producing heat where the transducers will not respond. They also could produce distortion when driven out of the proper frequency range.
6 db/octave crossovers can be one inductor and one capacitor. To get 12 db/octave you need 4 parts.
You could buy a packaged crossover from somebody like eminence or parts-extress, but really a couple of calculated parts on a board is a better deal. You know on individual parts how much energy you are wasting in winding resistance or capacitor ESR. You can include a tungsten bulb series the tweeter to prevent damage due to loud pops , mike feedback, or square wave source (crunch electric guitar).
Some people find bi-amping with a DSP producing the frequency filters before the two amps, cheaper these days than a passive crossover. Requires a cell phone to program the DSP, however. Wastes energy in the long term heating up two amplifiers on each speaker instead of one.
If you have one 2sa1943 and one 2sc5200 per channel, you have a 50 w amp instead of 200. If you used 30 v rails you might be able with a good heat sink to sustain 6 amps or 144 watts but more traditional 50 v rails cuts the dc SOA to 2 amps or 16 watts. AndrewT stated that DC soa predicted output transistor reliability. I find his rule predicts commercial practice of reliable class AB PA amps, although not the 3 second power ratings quoted on the cost cutter ebay/amazon/alibaba designs.
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You definitely need capacitor for the tweeter, otherwise it will distort and may burn.
Weather you need coil for the woofer depends on the fr response of the woofer and its breakups.
We can not help more, unless you provide more details. Crossover values depend on speaker impedances.