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[#1] 研究J形,S形,直臂的特色 應Tony兄建議,在R33人人都可以開thread討論前提下,大家LP愛好者將不同唱臂形狀的認識分享一下。 圖中臂是J形,Tony兄的新寵FR-14. 最後修改時間: 2012-06-20 12:38:19 |
孟波![]() 123.xxx.xxx.186 |
2012-06-20 12:36 | |
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[#2] 研究J形,S形,直臂的特色 孟波兄, Sorry, 我最後揀用Linn Ittok LVII裝上個LP12,冇用FR-14。 Ittok 唔係universal head shell, 換頭冇噤方便。 ^-^ hehe 最後修改時間: 2012-06-20 12:42:51 |
fomhk![]() 219.xxx.xxx.25 |
2012-06-20 12:40 |
[#3] 研究J形,S形,直臂的特色 SAEC 308SX都係J形,兩者有何分別? ![]() |
孟波![]() 123.xxx.xxx.186 |
2012-06-20 12:41 |
[#4] 研究J形,S形,直臂的特色 SME 3009S3係S形 ![]() 最後修改時間: 2012-06-20 12:48:46 |
孟波![]() 123.xxx.xxx.186 |
2012-06-20 12:48 |
[#5] 研究J形,S形,直臂的特色 FR 14 的臂管是靠右出,非在中軸位置。 是否FR的特別設計,理念是甚麼? |
fomhk![]() 219.xxx.xxx.25 |
2012-06-20 12:49 |
[#6] 研究J形,S形,直臂的特色 我覺得J形的最大原因, 係為了可裝上Ortofon SPU果類連唱壳的唱頭. 直臂就裝唔到. 最後修改時間: 2012-06-20 13:10:29 |
YS-AUDIO![]() 42.xxx.xxx.248 |
2012-06-20 13:04 |
[#7] 研究J形,S形,直臂的特色 For what is worth, I believe the main reason for S / J shaped arms is probably due to the need to provide the necessary offset angle at the armtube for using universal headshells. Everything else being equal, a straight armtube would be more rigid and cost less to produce, but you have to give up the convenience of using universal headshells. The recent trend in tonearm designs is to minimize the contact points and having rigid cartridge/headshell/tonearm coupling, so most newer arms use straight armtubes with integral (or specialized) headshells. 呢段話係mcwk回應一位網友問唱臂形狀時寫既,已經解釋左不同形狀唱臂既特點和限制,我都係應為咁。 |
孟波![]() 123.xxx.xxx.186 |
2012-06-20 13:14 |
[#8] 研究J形,S形,直臂的特色 孟波兄, Please excuse me for not posting in Chinese, as I only know how to use手寫板, so it would take me a lot of time to write! This is an interesting thread. About the FR14, correct me if I am wrong, but from the photo it seems like the vertical bearing (I am not sure if this is the right engineering term, but I am referring to the bearing for the vertical movement) is not in line with the horizontal bearing. If that is the case, wouldn’t the effective length be constantly changing? |
mcwk![]() 202.xxx.xxx.61 |
2012-06-20 13:18 |
[#9] 研究J形,S形,直臂的特色 Tony兄: FR-14雖然係我第一支買既獨立唱臂,但點解FR將支臂管錯開中軸manual 冇解釋,我E家經你一問思索到一D頭緒,俾少少時間我慢慢打。 |
孟波![]() 123.xxx.xxx.186 |
2012-06-20 13:18 |
[#10] 研究J形,S形,直臂的特色 先講講J形和S形既主要分別。 一般J形唱臂,如果臂管唔係和FR-14咁駁出位偏左去右邊的話,那未整支唱臂正面看重心就會偏左去左邊,這是J臂和S臂最大分別,J臂係要校side balance既,有部份J臂side balance在右邊,有部份在左邊,呢個唔係重點,重點係side balancd目的係平衡唱臂左右兩邊軸承既重心,尤其是單點臂至為重要。 而S形臂管則在提供off set angle requirement時同時又扭左扭右,解決埋左右兩邊平衡問題。 ![]() 最後修改時間: 2012-06-20 13:34:45 |
孟波![]() 123.xxx.xxx.186 |
2012-06-20 13:30 |
[#11] 研究J形,S形,直臂的特色 mcwk兄: 係同bearing有關,你有留意FR-14和SAEC-308SX兩者除臂管外,bearing角度在何不同嗎?我覺得FR-14為何將臂管尾部錯開可能就因為這原因。 有錯請指正分享,我都係自己諗,冇上網搵料。 最後修改時間: 2012-06-20 13:48:37 |
孟波![]() 123.xxx.xxx.186 |
2012-06-20 13:39 |
[#12] 研究J形,S形,直臂的特色 呢張圖幾有用,借來說明。 ![]() |
孟波![]() 123.xxx.xxx.186 |
2012-06-20 13:52 |
[#13] 研究J形,S形,直臂的特色 估唔到小弟一個無知既問題會引起大家的激蕩。真係多謝各位指教。 最後修改時間: 2012-06-20 14:04:18 |
patkwok![]() 121.xxx.xxx.32 |
2012-06-20 13:52 |
[#14] 研究J形,S形,直臂的特色 孟波兄, Yes, I can see that they have different angles at the bearing. In the 308SX, the vertical bearing stays in the same position all the time, so the effective length remains constant. However, in the FR-14 (assuming my observation that the vertical bearing is offset from the horizontal bearing is correct), wouldn’t the vertical bearing move closer and closer to the TT’s spindle when tracking towards the centre of the LP? Probably need to do more investigation! |
mcwk![]() 202.xxx.xxx.81 |
2012-06-20 13:54 |
[#15] 研究J形,S形,直臂的特色 孟波兄, Just found this description on the vinyl engine site: “While incorporating many of the innovations of the FR-66S and FR-66, the FR 14 arm features an unusual design approach in which the arm pipe is offset from the pivot point to allow a shorter pipe to be used. This is an advantage since effective mass is lower, yet the pipe itself is stronger and does not need as large a curve as in conventional designs. “ Maybe the design really meant for the arm’s effective length to increase when it tracks toward the centre! |
mcwk![]() 202.xxx.xxx.61 |
2012-06-20 14:18 |
[#16] 研究J形,S形,直臂的特色 mcwk兄: effective length應該唔受臂管形狀影響,mass就會,你copied段statement幾有道理。 以左圖B J-shaped唱臂為例,那垂直bearing其實和FR-14一樣,以尾陀段交叉成90度角。 你看看SAEC 308SX臂管和垂直bearing是和唱臂head shell off set後前端平行的,當支臂上落動作時,從正面望針尖兩翼和片紋距離是恆定相等的。 如果像B圖一樣,以微觀角度來看,相同動作下那針尖左邊翼其實會比右邊高了少許,FR-14將臂管錯開往右邊,我估計是將這現象減到最低,因為FR-14從針尖拉直到垂直bearing仍然是90度角,即效果和C圖一樣。針尖兩翼與片紋兩邊距離誤差少點。 最後修改時間: 2012-06-20 14:33:43 |
孟波![]() 123.xxx.xxx.186 |
2012-06-20 14:19 |
[#17] 研究J形,S形,直臂的特色 孟波兄, Come to think about it, yes, you are correct, the effective length will remain constant. You comment on the stylus reaction is probably also right, so I suppose the FR64S will do a bit worst in this contexts ![]() |
mcwk![]() 202.xxx.xxx.61 |
2012-06-20 14:45 |
[#18] 研究J形,S形,直臂的特色 Just for the photo shown, the FR64S is just too heavy for Linn LP 12. 最後修改時間: 2012-06-20 16:40:06 |
fomhk![]() 219.xxx.xxx.25 |
2012-06-20 16:39 |
[#19] 研究J形,S形,直臂的特色 tony兄: 玩Linn LP-12用埋Linn臂唔使煩,你支Ittok bearing角度都係和off set線成90度。 FR-14應該可以裝Linn LP-12,佢份manual就係用Linn LP-12做sample. FR-64s當年對待我來說好貴冇玩過新臂,唔知份manual點寫。 ![]() |
孟波![]() 123.xxx.xxx.186 |
2012-06-20 18:24 |
[#20] 研究J形,S形,直臂的特色 mcwk兄: 你說得對FR-64s和14既臂管做法雖然唔同,不過結果都係一樣(針尖和水平bearing和尾陀管成直線) |
孟波![]() 123.xxx.xxx.186 |
2012-06-20 18:29 |