Good example demonstrating relationship between cartridge's compliance and resonance frequency

（中文在後）

A good example demonstrating the relationship between the compliance of a cartridge and the resonance frequency of the arm/cartridge combo. Here the cartridge has a horizontal compliance at 15*10^-6 cm/dyne, and the measured lateral resonance is at 10Hz. Its vertical compliance is lower at 12*10^-6 cm/dyne, and the measured vertical resonance is at 12Hz. BTW, the arm is a uni-pivot design so the effective mass in each plane should be very similar.

唱頭的順服度與裝在唱臂上時的低頻共振頻率的關係，這是個好例子。它的水平向順服度是15*10^-6 cm/dyne，縱向是比較低的12*10^-6 cm/dyne。在單點軸承唱臂上，測得水平向10Hz，縱向12Hz。理論與實際數據算相當吻合。

Measurements at an Audio Showroom Lacking Low-Frequency Energy

（中文在後）

Figures 1 and 2 are for the Left channel, 3 and 4 the right channel, frequency response and bass decay data. The green line in each frequency response curve shows the phase response. 

The bass region below 60Hz is indeed down 10 to 15 dB, unexpected of such sizable speakers. The differences between channels are also quite significant, likely due to the asymmetric room shape. 

圖1，2是左聲道，3與4是右，頻響及低頻殘響數據。綠色線是相位響應。喇叭算很大，而60Hz以下的確是凹下，伴隨較高頻率的凸出，屬於典型的房間與喇叭交互作用。左右聲道的低頻明顯差異，應該來自不對稱的喇叭後方牆角。左後方的牆角相當近，應該是主要問題來源之一。

A tonearm that can do "Signals Reproduction 100%"?

This tonearm's flyer (from years ago) showed some interesting data and pretty tall claims, such as "Signals Reproduction 100%", "Dynamic Improvement 5dB" and "fluid damping...eliminates all vibrations including rumble during playing".

Another case of cartridge spec not agreeing with actual product

（中文在後）Another case where the spec does not agree with the actual product. When the top of the cartridge is near level, the cantilever is close to 30 degrees, quite far from 23. Though given the angle between the contact line and cantilever is close to 120 rather than the more common 110 degrees, the SRA still ends up just slightly higher than 90.

又一個規格與實際不符的情況。當唱頭上緣接近水平時，針桿角度約30度，遠高於23。但還好它的線／桿夾角在120度左右，所以此時SRA只比90度高一些。

Turning off sub-sonic filter when measuring cartridge-arm resonance

（中文在後）
Some USB sound boxes/cards, preamps, and phono stages have subsonic filters to suppress ultra low frequency noise from playing record warps, etc. When measuring the natural resonance of a cartridge-tonearm combo, be sure to turn the feature off, otherwise one may get incorrect readings. Figure 1 is with the filter turned ON in the ART USB Phono Plus while Figure 2 is OFF and shows better results.

有些USB音效盒，前級與唱放有超低頻衰減功能，播放不平的唱片時可保護喇叭或其它器材。但在測量低頻共振點時（Adjust+ 裡的 f res功能），要將這功能關閉，才不會影響結果。圖1是ART音效盒的濾波ON，圖2是OFF。後者明顯得到比較符合預期的結果。

Why high-tech vibration isolation/cancellation devices?

（中文在後）
Why is it necessary to use high-tech vibration isolation/cancellation devices? Unperceived by human senses, there's plenty low-frequency background vibration present in any living environment. Figure 1 demonstrates the spectrum reported by the Kurashiki Mini-560F, with its active cancellation function OFF, and nothing is turned on in my system. We can clearly see the energy presence of sub-20Hz vibrations in my listening room. Figure 2 shows the active function ON, and the vibrations now get below the -60dB mark. Removing these unwanted vibrations greatly improves the overall sound reproduction, obviously.

為何需要高科技減震器材？圖1是用倉敷化工 Mini-560F 主動平台的頻譜功能，將主動減震功能關閉時，可以看到，即使音響系統完全關閉，聆聽室有明顯的20Hz以下，人類的感官無法察覺的震動。這是所有環境幾乎都無法避免的問題。圖2是將主動功能開啟，這些震動立刻降至-60dB 以下。將這些背景震動移除，對黑膠播放或其它器材的音質，必然會有立竿見影的改進。順便提到，這已經是在號稱避震極佳的音響架上，所得到的數據。

Is anti-skating still necessary when using the swing headshell?

（中文在後）
Is anti-skating still necessary when using the swing headshell? The answer is apparently YES. In the first chart, the anti-skating is OFF, and the right channel shows much higher distortion. Adding anti-skating force to the maximum on the SL-1200G, then the distortion levels of both channels now become more even. Unfortunately, there's no known way to increase anti-skating even further on this arm.

使用搖擺唱頭蓋，顯然還是需要抗滑力。第一個數據圖是將抗滑關掉，右聲道的失真高很多。加了抗滑，就比較平衡了。