YAMAHA ysp-1-rev 维修电路原理图.pdf
WWW.AUDIOHOLICS.COM 3.05.05 Introduction Years from now home theater enthusiasts may be reading whole articles on the available models within the Digital Sound Projector category. For the present though, there exists only the category-defining Yamaha YSP-1, a brilliant marriage of compact form with simply amazing multi-channel synthesis capability. First Impressions When we first heard Yamahas demonstration of the YSP-1 at the 2005 CES we were fairly impressed. I remember noting at the time that the demo space had no roof. So the ambient noise level that is CES was at its usual 75DB or so. In fact, that was one of the most striking aspects of this demo. Instead of trying to construct an acoustically-correct sound room for their demo soundstage. Sure the content was the usual thunder storm or chirping birds in a forest, but the sounds were definitely not coming from a tinny little HTIB speaker mounted to the wall. Rather, the sound was spread out, maybe four feet wide over my left and right shoulders. And it seemed to exist, not glued to a speaker source on the wall, but floating out in the open space behind me. It was audibly located perhaps a foot forward of the plywood-wall, open-ceiling juncture. Two other interesting and new-to-me surround phenomena seemed to be taking place. First, because of the open ceiling, CES ambient crowd- noise now became the ceiling! The YSP-1s surround sound did not blend with the crowd- noise. Instead, the surround image stayed fixed within the confines of the four-wall plywood room. Yamahas crew seemed to have wanted to do the exact opposite. Construct a topless room with simple, hard walls made of 1/2 ply. There were large openings at the two back corners through which dealers could walk in and hear the demo. Hmmm. what was up? And the demo. I had heard demos like this in years past with any number of electronic-only methods of phase alteration and what-not that could throw simple sounds like birds chirping up and behind you - provided you sat in an exact sweet spot. So given the high ambient SPL from the CES crowd-noise and what seemed like a parlor trick-style demo on first listen, I was kinda-sorta impressed but not overly so. Then, listening a bit longer while still facing forward I began to notice the spread of the rear Yamaha YSP-1 Digital Sound Projector: A Milestone in Home Theater History The promise of a high performance, simple hook-up, one-box, surround-sound system fulfilled by Patrick Hart of A WWW.AUDIOHOLICS.COM2 review Specifications Yamaha YSP-1 Digital Sound Projector YSP-1 Digital Sound Projector Review Date 3.5.05 Review Summary Overall Rating: 4.75/5 Value Rating: 5/5 MSRP: $1499 Manufacturer Yamaha Electronics Pros Single-box, high performance, 42 digital amplifier, surround sound system Very easy, 30-minute hook-up; interconnects only. Dolby Digital 5.1 i.e. some for each beam only. 4. It is a button-push configurable two- channel, three channel, five-channel and three LCR channel + 2 channel surround-capable speaker system. Forty-two transducers total; two 4.5 left and right front mid-woofers on either side of the master array of 40 approximately 1.25 diameter drivers. The crossover frequency of the two 4.50 left-right mid- woofer drivers is switchable to 80Hz, 100Hz or 120Hz to match with an outboard subwoofer for which a low-level output is provided. The mid-woofers handoff frequency to the 1.25 forty- driver array takes place at 350Hz (1000 Hz in Corner-location mode). 5. It is the most decor-friendly, highest wife-acceptance-factor, true surround audio system ever designed. With the debut of the Yamaha YSP-1, its product execution, from the quality of materials, to the stunningly elegant industrial design, marks a high-point for performance vs. value in a category-defining product. Amp SectionMaximum Output Power (EIAJ) 2 watts (1KHz, 10% THD, 10) x 40 20 watts (100Hz, 10% THD, 4) x 2 Speaker Section1.5 (4cm) cone magnetic shielding type x 40 4.5 (11 cm) cone magnetic shielding type x 2 Input JacksTwo pairs Analog Audio (1V, 32 k) Optical S/PDIF Audio Coaxial S/PDIF Audio Output JacksSubwoofer Pre-out (1V, less than 120Hz) Video Out OSD (1Vp-p, 75) System Connector Jacks 1 System Control, RS-232C Finishes AvailableSilver enamel perforated metal grille, High-gloss black Plexiglas base General Power Consumption: 50 watts Standby Power Consumption: 0.5 watts or less Dimensions: 40.56 x 7.69 x 4.62 (103cm x 19.4cm x 11.8cm) Product Weight: 13 kg (28 lbs 10 oz) The YSP-1 is based around digital Sound Projector technology developed over the past 7 years in Cambridge, England, by 1 Ltd, a small hi-tech R without the oft-times intrusive consciousness of in-wall speakers installed in the corner behind me and to my sides I can now sense the sound bubble of a particular movie from the prospective of the bigness or smallness of the effect itself. In other words, I think Im hearing what the director and sound editor mayhave intended when he mixed in-studio from his fixed-position surround speakers. It is this effect, this ability of the sound field to expand and contract depending on program content that is most difficult for my auditory memory to wrap around and get a firm grasp of. Many of us, after all, have been listening to surround from known, fixed speaker locations for almost a generation. Putting aside the tremendous strides in direct surround vs. matrix, plus the ever increasing level of sound quality, one constant with surround speakers has always been that we know where our surround speakers are. We know how we expect them to sound, no matter how wonderfully immersive and diffuse. And we expect that sound to come from the general direction of the rear and side wall perimeters. It is this single aspect, this “floating-in-space” effect which helps to define the new sound of Yamahas Digital Sound Projector. Before we were 2D surround, trying to make the case for that last dimension with wall mounted speakers. With the YSP-1, the surround sensation always exists in a 3D space and the willing suspension of disbelief, as THX calls it, becomes easier to achieve. Sound Creation with Extensity Now that we have surround images floating in space, another apparent benefit becomes more obvious - that of the three-dimensional size of the floating image. It is here that my mind tells me this surround sound field is being portrayed unlike any Ive heard from a point source, mono-polar surround speaker. Depending on the frequency content of the image, say, above 1 kHz, the projected image can have a greater sense of width and depth than is usually possible with wall-mounted surrounds. Conversely with the YSP-1, lower pitched sounds or effects, above the subwoofers omni-directional frequencies can sound truncated or recessed. In making that last statement though I would say it takes a trained ear, along with a good audio memory of what a particular moment in a film sounded like over a conventional surround system, to realize what may be missing in the sound reconstruction as projected by the YSP- 1. And again, the honest-to-goodness 3D dimensionality of the surround soundstage greatly overwhelms the ear/brains ability to determine the frequency envelope of an effect to your side or from behind. Design and Construction Yamaha designers are acutely aware of the import a category-defining product such as the YSP-1 can have. Not only with first adopters but also with the second and third generation design variants which are sure to follow. GK Design has been closely aligned with the Yamaha family for decades. For all this time GK and Yamaha have shared the same basic WWW.AUDIOHOLICS.COM3 Item Name review WWW.AUDIOHOLICS.COM4 review design philosophy of elegant, simple-of-line, design execution. This philosophy has held especially true whenever rare milestone products such as the YSP-1 are first introduced. In the US, a little known aspect of Yamahas manufacturing prowess is their line of high style, exquisitely made, wood furniture (since 1903) available only in the Japanese market. So there is quite a long history of design thought given to melding what is hoped will be an elegant statement-piece of electronics into a home environment. I had been told that first samples of the YSP- 1 were already shipping. And since my review sample came in an unmarked box my guess is that these shipments would follow Yamahas long-held practice of sending the first lots to company rep organizations as well as press to see if there were any last minute issues which might have slipped past the engineering team. This lot of product is usually dubbed pre- production. A couple hundred pieces are typically test run on the actual production line to check last possible assembly glitches that could compromise the products build integrity. Also of note at this final stage of development is that all actual tooled production parts are used. So the following comments on the products fit, finish and overall design should be virtually identical to final production. At a suggested retail of $1499 SRP the YSP-1s well chosen and expensive construction materials plus exemplary fit and finish set a benchmark for every subsequent product to emulate. My significant other immediately approved the classy, muted silver- gray perforated metal grille across the upper span of the units face. She loved the fact that in most room lighting, the 42 black drivers mounted on a flat-black background behind the grille make them invisible. The bottom front area sports a clear Plexiglas-over-high-gloss- black background running lengthwise across the entire device. The subtle dull-to-shiny blend of the grille versus the base was also highly regarded in my household. Behind the plexiglas in the units bottom- center is a 4 x 1/2 flouroscan dot-matrix display in a muted blue. This is my favorite choice of display technology and color as it is equally readable both in darkness and in most typical lighted room conditions. (The light level of this display is adjustable from 0 to -1 or -2 in the software. I found -2 worked equally well in darkness or daylight conditions.) The YSP-1 Remote Im big, really big on easy-to-use remotes. Im just guessing here but Id say Yamahas YSP-1 engineering team must have taken several samples home for their wives and kids during development. The basic operations are simplicity in the extreme, and intelligently grouped along the remotes bottom 40% of real estate. The remote works within a pretty generous 30 window and at that 30 angle its good for full functionality to about 20 feet. There are some really clever ergonomic touches that are not apparent until you study the remotes layout a bit more closely. For example, the TV channel up-down buttons have been moved up and out of the most-used bottom sector. (Keep it on channel 3!) Another brainy move was placing all the set- up routine buttons in a sort of no-mans-land center section around the ubiquitous Up-Down- Left-Right directional wheel with center Select button. This leaves a neatly divided and simple- to-use remote with most-used, single-push controls at the bottom. At the top are secondary controls which the kids or grandparents would use less often once the movie or TV program is started. This is a remote I can remember easily and, for instance, coach my fiances grandfather over the phone should he get in trouble. Just set it up once, warn kids and novices to stay away from buttons with green nomenclature in the center area, and youre home free. It doesnt get any better than that! Along the remotes bottom are the four available beam modes. This section has a violet background which immediately identifies this remote as belonging to the Digital Sound Projector. (As we shall see later in the review all four beam modes are available when the YSP- 1 and your video display are placed flat against a wall surface. For a corner arrangement, only two of the four modes, Stereo and 3 Beam mode are available.) Above the beam mode selection buttons are a soft-white TV input selector and four dark gray source selection buttons for TV, DVD, VCR and aux. The owners manual suggests aux can be either a digital satellite tuner, digital cable or a game console. There is even a sleep mode button which alternates by single presses between 30 minutes, 60 minutes, 90 minutes, 120 minutes and off. The next section up from beam mode selection will be the most utilized. And it is here To the right along the bottom are four square, flat black tact-switch-style push buttons labeled Input, Volume - / + and Standby/On. To the Left along the bottom is a barely discernable Yamaha logo with Digital Sound Projector YSP-1. A 0.2 wide x 6.25 high gloss black plastic end-cap finishes off both left and right sides of the perforated grille. Moving around to the back, the units materials and quality of finish are every bit as impressive. Presumably to contain EMI radiation that may be emitted from the digital amplifier chips, a double-layer steel chassis has been fabricated with overlapping seams. The outer black-oxide coated chassis sits atop an eight- tenths width plastic injection-molded base. On the YSP-1s top, two black-anodized aluminum extrusions form the upper cover. A plastic cap which has the Yamaha logo reverse-embossed is affixed at the top center to cover the seam of the two aluminum extrusions. WWW.AUDIOHOLICS.COM5 Item Name review that the simple two-color button theme plus clever spacing ergonomics play such a subtle, yet vital roll. To the left in soft-white are the + and - TV Volume rocker-style buttons for the TV speakers. On the remotes right side the two + and - charcoal gray buttons simply called Volume. A soft-white TV Mute is in the center between these two rocker-style volume controls and matching charcoal gray Mute to quiet the YSP-1 is above that. To me, the remote and its design are one of the surest signs signaling the care with which an electronic piece of gear has been designed. If systems remote functions well; if it is both intuitive in layout and labeling, and smooth and quick in operation, the end result is increased satisfaction with the system as a whole. If you hold it down, the volume control on the YSP-1 goes from -99.5dB to 0dB in less than 10 seconds. Thats 199 points of volume adjustability! To my mind the speed, smoothness and accuracy of this volume control are perfect. The mute threshold for the YSP-1 is adjustable in the menu, so you can have the volume cut off completely, or mute it to a level more appropriate to your preference. Using the YSP-1s remote to control my eight- year-old Mitsubishi TVs volume, the action of this new remote was much smoother than with the remote that came with the TV. Now thats cool. Situated just below the Standby/On and AV Power buttons at the top is the numerical keypad. The numerical buttons will probably be used most times for setting up the initial remote codes for non-Yamaha devices. I
