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交易0 分威望37272 点收听数听众数星座双鱼座生肖蛇QQ居住地甘肃省 兰州市买家信用卖家信用在线时间990 小时相册帖子日志记录好友主题分享注册时间最后登录阅读权限40积分47272精华0UID306889
最近淘了两台QSC-USA850，想玩桥接，接线的时候傻了，没有标明音箱线的（+）和（—）。大家看图。有知道的坛友指导一下，感谢 感谢。这是我的另一台 松下RAMSA--WP1400G后级。后面板标示的很清楚。QSC-USA850后面板则没标明。
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交易0 分威望17082 点收听数听众数QQ买家信用卖家信用在线时间524 小时相册帖子日志记录好友主题分享注册时间最后登录阅读权限40积分22422精华0UID254991
把qsc后边照个片发来看下
交易0 分威望37272 点收听数听众数星座双鱼座生肖蛇QQ居住地甘肃省 兰州市买家信用卖家信用在线时间990 小时相册帖子日志记录好友主题分享注册时间最后登录阅读权限40积分47272精华0UID306889
还有图片，继续
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交易0 分威望37272 点收听数听众数星座双鱼座生肖蛇QQ居住地甘肃省 兰州市买家信用卖家信用在线时间990 小时相册帖子日志记录好友主题分享注册时间最后登录阅读权限40积分47272精华0UID306889
这是一张参数表。
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交易0 分威望37272 点收听数听众数星座双鱼座生肖蛇QQ居住地甘肃省 兰州市买家信用卖家信用在线时间990 小时相册帖子日志记录好友主题分享注册时间最后登录阅读权限40积分47272精华0UID306889
我拆开后，感觉要把音箱线的正极接CH2里的红接线柱，因为从功放机里面看，线的外皮是红色的。不知对不对。请给位老烧指点一下:D:D
交易0 分威望15929 点收听数听众数QQ买家信用卖家信用在线时间907 小时相册帖子日志记录好友主题分享注册时间最后登录阅读权限40积分25099精华0UID254966
好家伙，LZ家里的东东好多啊:lol:
视频：SONY HW40ES
音源：OPPO 103D
功放：雅马哈Z7 升级ING
音箱：RF62+RC62+RS52
低音炮：SB13U
交易0 分生日1957 年 8 月 14 日威望8987 点收听数听众数星座狮子座生肖鸡QQ居住地广东省买家信用卖家信用在线时间517 小时相册帖子日志记录好友主题分享注册时间最后登录阅读权限40积分14247精华0UID305684
交易0 分威望53415 点收听数听众数QQ买家信用卖家信用在线时间2887 小时相册帖子日志记录好友主题分享注册时间最后登录阅读权限40积分82385精华0UID112688
本帖最后由 zhou0362 于
17:13 编辑
基本常识都没有！红正黑负！
既然拆开了，就看电路板，负极是并在一起的，正极是单独的。
交易0 分威望37272 点收听数听众数星座双鱼座生肖蛇QQ居住地甘肃省 兰州市买家信用卖家信用在线时间990 小时相册帖子日志记录好友主题分享注册时间最后登录阅读权限40积分47272精华0UID306889
zhou0362 发表于
基本常识都没有！红正黑负！
看清楚。是玩单声道，一台功放负责一个声道。桥接是接两个红色接线柱。晕
交易0 分威望25404 点收听数听众数QQ买家信用卖家信用在线时间2321 小时相册帖子日志记录好友主题分享注册时间最后登录阅读权限40积分48714精华0UID89664
用万用表量下就知道了
交易0 分威望37272 点收听数听众数星座双鱼座生肖蛇QQ居住地甘肃省 兰州市买家信用卖家信用在线时间990 小时相册帖子日志记录好友主题分享注册时间最后登录阅读权限40积分47272精华0UID306889
老大，电容把线路挡住了，看不到。为这个大卸八块，不值吧。有懂的来，郁闷:mad:
交易0 分威望37272 点收听数听众数星座双鱼座生肖蛇QQ居住地甘肃省 兰州市买家信用卖家信用在线时间990 小时相册帖子日志记录好友主题分享注册时间最后登录阅读权限40积分47272精华0UID306889
拆开看到，从左至右依次顺序 黑&&黄&&红&&黑。我的理解桥接是把开关拨到BRIDEGEA。然后接左右声道的红色接线柱。问题来了，两只红色的接线柱，也分（+）（—）吧。我觉得两只音箱线（+）级接红色，（—）级接黄色，不知对不对。
交易6 分生日1962 年 4 月 20 日威望596308 点收听数听众数QQ买家信用卖家信用在线时间31098 小时相册帖子日志记录好友主题分享注册时间最后登录阅读权限40积分907388精华45UID5
这个功放具有桥接设计，没必要拆机，看来你非得把功放搞坏才安逸。
桥接输出应该全部接红。信号输入其中一个，输入的那个通道作为红对待，另外为黑。
另外这个是专业功放，楼主没必要这样折腾了，立体声驱动都可以的。
我就是一个技术民工.不懂市场行情,别问我.
家庭影院：OPPO105+天龙AVC A1HD+骄阳HSR12+MK入墙喇叭IW150+IW95+夏普Z17000A+文臻106寸电动灰幕+索尼55E720电视机全新打造完成！ipad和iphone4S加盟airplay作为背景休闲音乐播放！乐富豪80周年纪念版听音乐用。
交易6 分生日1962 年 4 月 20 日威望596308 点收听数听众数QQ买家信用卖家信用在线时间31098 小时相册帖子日志记录好友主题分享注册时间最后登录阅读权限40积分907388精华45UID5
这也许就是瞎折腾的节操。
我就是一个技术民工.不懂市场行情,别问我.
家庭影院：OPPO105+天龙AVC A1HD+骄阳HSR12+MK入墙喇叭IW150+IW95+夏普Z17000A+文臻106寸电动灰幕+索尼55E720电视机全新打造完成！ipad和iphone4S加盟airplay作为背景休闲音乐播放！乐富豪80周年纪念版听音乐用。
交易0 分威望6991 点收听数听众数QQ买家信用卖家信用在线时间1809 小时相册帖子日志记录好友主题分享注册时间最后登录阅读权限40积分25181精华0UID160539
转换到桥接状态后，输入插CH1,喇叭正接CH1的红，负接CH2的红。
交易0 分威望37272 点收听数听众数星座双鱼座生肖蛇QQ居住地甘肃省 兰州市买家信用卖家信用在线时间990 小时相册帖子日志记录好友主题分享注册时间最后登录阅读权限40积分47272精华0UID306889
ericyangtao 发表于
转换到桥接状态后，输入插CH1,喇叭正接CH1的红，负接CH2的红。
感谢这位烧友，很有帮助。就这么简单的问题，懂的人就是一两句话的问题。看看前面有些人，真是令人齿冷。发烧最大的乐趣不就是折腾吗？活到老学到老，人不可能什么都懂。谦虚是种美德。我相信世界上还是好人多的。在次谢谢这位烧友，好人一生平安。
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输入灵敏度&:&&&&&&&&&&&&4&O负载满功率输出时为1.25V（RMS有效值）&频响特性(1W)&:&&&&&&&22Hz-20kHz，+0dB，-0.8dB&信号噪声比:&&&&&&&&&&&&&A计权，满功率输出&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&不计权，满功率输出&93dB&总谐波失真&:&&&&&&&&&&&&&&0.5%&互调失真&:&&&&&&&&&&&&&&&在满功率输出时，60Hz和7kHz，4：1两个方波、&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&＞0.3%（-40dB）&阻尼系数(8&O)&:&&&&&&10Hz-400Hz：＞200&通道间串音&1kHz：-76dB；20kHz：-58dB&输入阻抗&:&&&&&&&&&&&&&&&&平衡输入20k&O；&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&不平衡输入10k&O&负载阻抗&:&&&&&&&&&&&&&&&&立体声输出时，每通道的额定负载阻抗为2&O-8&O&,&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&桥接单路输出的额定负载阻抗为4&O-8&O&电源电压和频率&:&&&100V、120V交流电&50Hz/60Hz&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&220V-240V交流电&:50Hz/60Hz&体积&:&&&&&&&&&&&&&&&&&&&&&&&EIA标准19英寸（483cm）机架安装宽度，&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&3.5英寸（8.9cm）高和15.2英寸（38.6）深
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产品规格参数和简介
Type： Monoblock tube amplifier
Power Tube： Single 805 directly heated triode
Power Output： 55 watts
Frequency Response： 20Hz to 50kHz (-3dB)
Input Sensitivity： 1 Volt
Input Impedance： 10kOhms
S/N Ratio： &83dB
Load Impedance： 4 & 8 (16 optional) Ohms
Dimensions： 260 x 460 x 270 (WxDxH in mm)
Weight： 19kg (each)
The WAVAC family of tube electronics from Japan is widely recognized for fabulous cosmetics, no-compromise build quality, glorious sonics, and ? inevitably, given their design approach ? very high prices. This writer has previously had the pleasure of reviewing the company&s EC-300B and MD-300B stereo amplifiers, driving very high-efficiency loudspeakers appropriate to their 10 wpc power output. The MD-805m monoblocks& 55-watt power offered a chance to evaluate the WAVAC approach to amplification with a wider range of loudspeakers, and I jumped at the opportunity to try them out.
WAVAC offers an unusually large selection of amplifiers, based on numerous output tubes and ranging in price from around $7,000 up to $350,000! The basic characteristics of the line are consistent throughout： all are Single-Ended Triode (SET) designs running in pure Class-A mode. All use WAVAC&s proprietary IITC (Inverted Interstage Transformer Coupled) architecture, and all incorporate ultra-wide-bandwidth Tango transformers.
First Look
At a bit over 40 lbs. each, these amplifiers are dense little nuggets. &The chassis enclosures are exceptionally rigid and acoustically dead. The top plate is a 10 mm-thick aluminum, which provides a resonance-resistant platform for attaching circuit components.
The sculpted fascia, nearly an inch thick on the left side, holds the familiar large WAVAC power-on button and power LED, as well as a volume control knob. The inclusion of the passive volume control allows the owner of a single-source system to connect, say, a CD player directly to the amplifiers without need for a preamplifier. &Within a more conventional setup, the volume knobs allow the listener to "trim" channel balance if the system preamplifier has no balance control, as is commonly the case these days.
The three tubes of each chassis are exposed on the front half, surrounded by a heavy glass screen. The transformers are behind the tubes in a sealed protective enclosure. The IEC input, 4- and 8-ohm loudspeaker terminals, and a single RCA input jack are located at the very rear of the top plate ? a thoughtful choice that facilitates connections using thick and less-flexible audiophile cables.
Functional Highlights
The robust 805 power tube allows these amplifiers to deliver a solid 55 W with only a single output tube per side. WAVAC suggests that this kind of minimalist design offers better performance and more SET "magic" than parallel SET designs using multiple output tubes to get higher power output. The 4Ohm & 8Ohm speaker output taps offer greater flexibility and excellent sonic performance with a broader range of loudspeakers. The MD- 805m drives 4Ohm speakers with aplomb ? a rare ability among SET designs.
The IITC circuit completely eliminates capacitors in the signal path. &In particular, DC ignition of the filament contributes materially to the amplifiers? excellent S/N ratio. &In addition to the heavy-duty chassis, anti-resonance measures include isolation of the tubes and transformers from the chassis with elastomers In order to reduce tube microphonics and transformer vibration.
Notes for Tube Rollers
In my previous WAVAC reviews, including the magnificent PR/T1 line stage, I found that the essential neutrality of the circuits made sonic changes resulting from substituting different tube immediately and clearly audible. I had originally planned to do a good bit of tube-rolling for this review, but circumstances dictated differently. This review sequence was unusually lengthy, being interrupted by a four-month hiatus caused by my relocation from California to Chicago. Not having lived in the Windy City for some 25 years, I have not yet established a full complement of audio buddies ? including tube enthusiasts with good stuff to lend ? as I had on the west coast.
The tubes provided with the MD-805m&s by Jim Ricketts of WAVAC distributor tmh Audio proved to be excellent：
& & &Input： NOS GE
& & &Driver： NOS GE 6Y6GC
& & &Output： New production Chinese 805
Jim Ricketts also sent a note with several suggestions, which I am including here for reference by interested tube rollers"
"With respect to input tubes, listener reports and my experiences indicate superb results with other 12AX7 types, including Mullard ribbed-plate and Mullard CV4004 box-plates for that gorgeous Mullard midrange. For a more neutral & clean sound, we have had great results from Telefunken ECC801S & NOS Tesla grid-frame types. Since tube tastes are subjective, any high-quality 12AX7 type that an owner prefers would work well and provide that last bit of fine tuning. The NOS GE 6Y6GC is
no need to experiment. They are widely available for under $10 each, and they last a very long time. The Chinese 805 tube is well made in a ISO9001 factory [which indicates stringent quality control standards] and provides excellent sound."
Just to verify my assumption that these amplifiers would match the typical WAVAC sensitivity to tube differences, I did make a couple of brief substitutions with recent-production 12AX7s I had on hand. &The differences were indeed clear, but neither substitute rivaled the impeccable tonal balance and transparency of the original.
Review Conditions
In the course of several months of listening, these amplifiers were matched with an impressive array of equipment, both upstream and downstream. &Preamplifiers were the WAVAC PR-T1 (sheer sonic bliss, for a net tab of almost $50K), Atma-Sphere MP-3, Modwright SWL 9.0SE, and my reference VTL 7.5 line and Thor TA-3000 phono stages. The amps performed impeccably with all of them.
Loudspeakers included the Oskar Heil Kithara, ELAC 608.24, and my current reference Meadowlark Blue Heron 2. &(Note that there are no super-sensitive 100+dB speakers on this list.) &All three are fairly efficient designs with around 90dB sensitivity. I more typically drove all three with big, very powerful amplifiers, especially my VTL MB-750 Reference monoblocks. &But I was gratified to find that these little 55 W SETs are able to push those designs to surprisingly robust, room-filling listening levels without notable strain ? something no 300B-based SET could do. &It was of course possible to push the amps into clipping in my more insane moods, but these amplifiers were quite comfortable producing volumes that would satisfy me 80% to 90% of the time. &These are SET amplifiers for those who, like me, are generally not big fans of horn-loaded loudspeakers.
The Sound Of The MD-805m
To cut to the chase (and, I suppose, give away the punch line), the sound of these amplifiers is virtually flawless. From the left-brain, audio-checklist viewpoint, the only reservations I have are in ultimate power output and ultimate bass performance. As I suggested earlier, their ability to drive reasonably efficient loudspeakers is hardly deficient unless judged against much higher-powered designs. I don&t recall any other 50-watt amps that do better with the kinds of speakers I used.
WAVAC MD-805m Monoblock AmplifierBass response does not reach the subterranean depth and jump-out-of-your-seat impact and amplitude of some, especially solid-state, amplifiers. However, the bass is quick, tuneful and wholly continuous with the rendering of the higher frequencies. It is superior to what I have heard from any other SET amps.
Beyond those minor points ? which are not deficiencies so much as expectable characteristics from this class of amplifier ? I can offer nothing but superlatives. No matter what combination of equipment surrounded the amplifiers, they consistently delivered broad and commendably deep soundstaging, with stable and dimensional rendering of individual and ensemble instruments and voices. Altogether, their spatial resolution is absolutely first-rate.
I do not recall hearing any amplifier, regardless of type, power or cost, that is more consistently free of tonal colorations. The clarity and openness that flow from these remarkable 805 amplifiers is truly uncanny. They are a Crystal Palace for your music!
As my time with the amplifiers progressed, I noticed an interesting phenomenon. More and more frequently, I found myself listening at lower volume than is typically my practice. And no, that was not because of power limitations. &The sonic presentation was so comprehensively pleasing ? harmonically complete, open and relaxing ? that I simply didn&t feel the need to turn it up! Probably no term in audio is as ubiquitous and indiscriminately used as "transparency." But these amplifiers would be a great choice as the poster child for the concept. From the subtle vocal modulations of jazz singer Tierney Sutton to the symphonic complexities of Stravinsky and Mahler, the MD-805m&s simply "get it right" ? in scale, in tonality, and most importantly in the ability to reach out and draw you emotionally into the music.
Conclusion
As always with WAVAC, the question of price/performance value is necessarily part of the equation. Yes $19,000 is a lot of money for any amplifier, and certainly for 55 watts. But tempting as it may be to break out the old "If you have to ask, you can&t afford it" clich?, in my opinion it really doesn&t apply here. The purity and beauty these amps deliver make them worth strong consideration from any highly discerning listener who values musical truth over audio dazzle. If your loudspeakers and other equipment match up well, and of course if your budget permits, you owe it to yourself to listen to these very special amplifiers.
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