本帖最后由 阳光枫林 于 2019-7-13 16:33 编辑
套机真的不用调吗？就算出厂调好了，运输过程一振动，早就偏离状态了，更不用说国外几千块的厂家套机用料省到没朋友，有时候怎么调都出不来令人满意的声音。
黑胶唱机，不管是套机还是自己搭配，都要调的。
套机不用调的原因是重要数据全部固定，简单机唱头称重是需要的。轴心距是根据唱臂长度来计算的，每条唱臂都会推荐最佳轴心距，唱盘厂家设定好轴心距后路途再颠簸，轴心距也不会变。君子臂是直臂里的典范，依靠的就是一个巧字，为什么国内很多家做黑胶的要仿制君子臂，因为它容易获得好声音。
套机就是厂家调完的机器，代表厂家的声音风格趋向。要全部靠自己调到套机的水平，还真的有点难度。还是拿君子臂说，低到RB110，高到RB2000，他们最大特点就是容易调！容易出好声。
The importance of zero play in the bearings of a Hi-fi tonearm
Rega is famed for its tonearm designs. One unique characteristic of these designs is the achievement of near frictionless movement horizontally and vertically whilst having no measurable free play in the bearing assemblies (and in reality one or two microns of pre load). So, why has Rega spent over thirty years and invested so heavily in thisarea of tonearm design where the removal of even microns of movement has been pursued?
Look at a stereo vinyl LP under an electron microscope and you will see microscopic ridges and bumps that the diamond stylus of the pick-up cartridge tracks and reads. Thelengthofaridgedependsonitsfrequency. The height is its amplitude.
Towards the centre of an LP, a 10Khz signal is just 26 microns long and if it’s very quiet it may be less than 10microns high. If your tonearm has 10 micronsofmovementwithinthebearingassemblies(andevenvery expensive tonearms usually have much more play and movement), reading the bumps will be difficult and musical vibration will be lost in arm movement.
It is impossible to quantify exactly the musical distortion or loss of measured information. This is due to the random nature of pivot or bearing movement. However, it is easy to see that accurate measurement or tracking of a 10 micron bump is not possible if the tracking stylus can move randomly at least the same distance that it is trying to measure.
Workings : Towards the centre of the playing area on an LP.
At 0.15m diameter the groove speed is :
0.15 x π x 0.55 revolutions /sec = 0.26m/sec (linear velocity).
Wavelength = velocity of wave / frequency
One cycle 0.26/10Khz= 0.000026m = 26 microns (μm)
The calculated 10 kHz signal wave length is 26 microns.
Therefore a single ‘bump’ is half of this.
君子比阿玛尼声音靠谱
本帖最后由 lesliealantam 于 2021-2-3 21:54 编辑
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本帖最后由 阳光枫林 于 2019-7-30 06:54 编辑
不久前朋友买了LP22的盘加二手SME309唱臂，声音很棒。
我比较同意枫林兄的意见。阿玛尼的盘是可以的。我没有听过LP22, 但是LP62, LP82同场比较过VPI TNT 3.5(算是老旗舰吧）和VPI Scoutmaster，还特意用了2个一模一样的MC头比较，以场面细节方面62/82不输给TNT, 音色上会有区别, VPI ScoutMaster明显少了很多信息。所以如果算上价格，我相信同平台的22是很超值的。
但是阿玛尼的盘有几点要注意，阿玛尼的臂和臂线不成，必须换个正牌好的。那轴承需要调整一下，个人认为要轴承珠刚好顶住底部，｀浮＇起來声音会虚。另外纯铝盘高频有些振动，需要垫子上花点心思。
Rega 听过RP10, 觉得也挺不错，不过就不算入门级的价格了。个人认为P3真的太单薄了，喜欢进口的巨富推荐的Clearaudio Concept听过也不错。
本帖最后由 阳光枫林 于 2019-7-30 17:35 编辑
clearaudio concept转盘部分还是太单薄了，clarify唱臂是OK的，只是clarify是磁吸单点臂，对刚接触黑胶的玩家来说比较难调整，国内商家的调整水平又差强人意。
阿玛尼的盘是可以的，臂的确不太行，换成sme老款3009或者在产的309会好很多。
阳光枫林 发表于 2019-7-30 17:33
clearaudio concept转盘部分还是太单薄了，clarify唱臂是OK的，只是clarify是磁吸单点臂，对刚接触黑胶的玩 ...
枫林兄有没有试过配SME V?
Tequila 发表于 2019-7-31 06:00
枫林兄有没有试过配SME V?
我用过3009，5009和V9，帮朋友调过很多次309和V12
枫林兄真是技术发烧的偶像:P
我是希望想玩黑胶的烧友少交点学费。我刚开始玩的时候交了不少学费，因为根本没人帮我，只能靠自己买来研究。
本帖最后由 lesliealantam 于 2021-2-4 01:00 编辑
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为啥我好几个朋友都能单买到LP22转盘，就你买不到呢？
本帖最后由 steffen 于 2019-8-3 11:14 编辑
阳光枫林 发表于 2019-7-30 17:33
clearaudio concept转盘部分还是太单薄了，clarify唱臂是OK的，只是clarify是磁吸单点臂，对刚接触黑胶的玩 ...
去年新出的CONCEPT唱臂已經不是磁浮唱臂了，改款的原因不知是磁浮不好生產還是聲音的考量
