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#1
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how to built a 3D suround sound system?
I posted the previous ? " how to built a dolby system ? " .The answer
was good. So I can't built a dolby system without license from DOLBY inc . If so can I built a 3d surround sound system amp that can support 4 speakers of 400watts capacity . Can anyone help me out how to built a 3D suround sound system from scratch? |
#2
Posted to rec.audio.tech
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how to built a 3D suround sound system?
"AMBROSE" wrote ...
I posted the previous ? " how to built a dolby system ? " .The answer was good. So I can't built a dolby system without license from DOLBY inc . If so can I built a 3d surround sound system amp that can support 4 speakers of 400watts capacity . Can anyone help me out how to built a 3D suround sound system from scratch? Again, what do YOU mean by "3D surround system" And what do you mean by "from scratch"? Preamp/controller/decoder? (Already discussed problem with "decoder") Power amp(s)? Speakers? Just system integration with store-bought components? If you don't precisely define what you are asking, you are unlikely to get the answers you want. |
#3
Posted to rec.audio.tech
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how to built a 3D suround sound system?
"Richard Crowley" wrote ... "AMBROSE" wrote ... I posted the previous ? " how to built a dolby system ? " .The answer was good. So I can't built a dolby system without license from DOLBY inc . If so can I built a 3d surround sound system amp that can support 4 speakers of 400watts capacity . Can anyone help me out how to built a 3D suround sound system from scratch? Again, what do YOU mean by "3D surround system" And what do you mean by "from scratch"? Preamp/controller/decoder? (Already discussed problem with "decoder") Power amp(s)? Speakers? Just system integration with store-bought components? If you don't precisely define what you are asking, you are unlikely to get the answers you want. If you are just asking about constructing a power amplifier, can we assume that you mean 4 channels of 100 watts each? What is your level of electronics construction experience? There are various ways of doing this with varying degrees of "from scratch". And what is your proposed budget? |
#4
Posted to rec.audio.tech
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how to built a 3D suround sound system?
I posted the previous ? " how to built a dolby system ? " .The answer was good. So I can't built a dolby system without license from DOLBY inc . If so can I built a 3d surround sound system amp that can support 4 speakers of 400watts capacity . Can anyone help me out how to built a 3D suround sound system from scratch? There are a number of things you can do without a license, which will help create more realistic stereo ambiance using a multi-speaker system. One or another of them may suit you. The simplest is to implement the old "Dynaquad" system. This is a method for hooking up four (identical) loudspeakers, in a left/center-front/right/center-rear arrangement. It can be done using just a normal stereo amplifier... it's a passive difference-extraction system. Google around a bit and you'll surely find a page which shows how it's hooked up. A slightly more complex approach is to build a two-channel-in, four-channel-out amplifier, and include the equivalent of the Dynaquad summing/differencing logic prior to the amplifier section... using a handful of high-quality op amps and some passive components would be the way to go. This would give you a bit more leeway with your loudspeaker selection, as the speakers might not need to be physically and electrically identical. You could also include a line-level low-pass/high-pass crossover system, moving the low bass out of the left/center/right channel pathway and driving a separate subwoofer. An even fancier approach is to take the two incoming signals, and implement the ambience extraction (differencing) and even ambience simulation (time delay and echo emulation) via time-delay electronics. The old a/d/s ambience extraction system, and I believe some of the earlier Yamaha models, used analog charge-coupled "bucket brigade" chips. Newer systems will digitize the analog data, feed it to a DSP, have the DSP do all of the signal mixing/processing via digital math and a bucket of memory to hold the samples, and then reconvert to analog using DAC chips and amplify the resulting analog signals for the speakers. There's probably an order of magnitude difference in difficulty between the first approach (for which you can use a stereo amplifier you already have) and the second (in which you actually build a four-channel amp plus some analog circuitry). The third approach is probably an order-of-magnitude more work than that. As to the amplifier stages themselves... there's six boatloads of DIY amp designs out there. The Leach amplifier design is well thought of... it's a fairly traditional Class AB linear amp, capable of excellent performance. If you want something slightly more shrink-wrapped, you can buy power amplifier modules (drivers, power transistors, and heatsinks) from Marchand (www.marchandelec.com) and wire them up with a power supply of your own construction. The Marchand modules can generally be bought as complete kits, or fully assembled and tested. -- Dave Platt AE6EO Hosting the Jade Warrior home page: http://www.radagast.org/jade-warrior I do _not_ wish to receive unsolicited commercial email, and I will boycott any company which has the gall to send me such ads! |
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