【雲中來的音樂 - Computer Audio】家訪 Eton

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謝謝 Powerman 兄，調喇叭密技又多一種。
是否 Toe-in 的事，的確也各有擁簇，值得玩味的是，早期的 Avalon 在操作手冊裡皆提倡不要 Toe-in ，自從換了 Isis 後，操作手冊 （page 14) 就改了，衷於原著就恕不翻譯了：
Adjusting the toe-in angle of the speakers is useful in tailoring the sound to best match the characters of your system and listening room.
When the speakers are facing straight forward, they tent to create a large, expansive sound-stage, painted with broad brush strokes.
As they are rotated forward the listening position, the image becomes more compact, with increase focus, creating a greater sense of intimacy.

呵呵，真巧，我也刚在看isis的说明书呢。网上下的。
会不会是垂直的影响而不是水平的影响呢，isis的高音是从高向下打向人耳朵。会不会之前从上向下的角度有些偏差呢？
见过有些喇叭设计的时候考虑到离轴和正轴的平均值，是会建议不用toe in。因为在家具环境，离轴的影响也不会少于正轴。

powerman兄那个mono的方法，我类似的也试过，因为刚好我在用的喇叭说明有介绍过，不过是用pink noise的。
下面的说明书摘录的：
PINK NOISE LISTENING TEST FOR FOCUS: Play a pink noise source such as a CD with test tones or an FM tuner set between stations (with muting turned off). You will notice one of two sonic effects when listening to pink noise:
1. If you are in the focal point of the array, you will hear a “ball” of noise that appears to float between the speakers. Although noise will appear to emanate from the speakers themselves, the center image will be stronger, with a slightly different tone quality to the phantom center image. The sound from the speakers themselves will seem slightly detached from the pink noise ball, and slightly softer in volume level. The center “ball” of sound will be very strong, and you will be able to detect that the “ball” of sound is round, with depth to the image. This is a ‘locked in’ image with correct focus.
2. If you are not sitting in the focal point, the noise will be diffuse, without a center image. Although you will hear noise coming from the center, it will sound as diffuse as the sound coming from the speakers themselves. Even though the speakers will image music when set up like this, the imaging will be diffuse and non-localized. There won’t be enough ‘body’ to the images, and it will be hard to hear space between the instruments. There is a distinct lack of image focus in this situation.
To find the focal point of the VR system, move forwards and backwards slowly while listening to the pink noise ‘ball’. You can either rock in your listening seat, or move back and forth by several feet if you are way out of the equilateral triangle (using a director’s chair for this works great). If you have a fixed seating position that can not be moved due to furniture considerations, you will have to move the speakers either closer together, or further apart, depending on the strength of the pink noise ‘ball’. If the speakers are closer together than 8 feet, try spreading them further apart.
*Note: if the speakers cannot be separated more than a few feet due to room considerations, as in a video application, it may be necessary to toe the speakers outwards.
If you are placing the speakers further apart than 8 feet, try toeing them in towards you, listening for the ‘ball’ to lock in. It really helps to have two people moving the speakers while you sit in the listening position, giving orders. Toe-in is often critical, with only 1" movements being very apparent. When you have found the correct spacing and listening distance, you will immediately know it, since the image lock-in is very obvious. The pink noise will become a very strong ‘ball’ of sound, just floating in between the speakers. Keep moving the speakers until you hear this ball of sound. As you move the speakers either closer together or further apart, and experiment with toe-in, you will hear changes that enable you to know if you are headed in the right direction. It is not really difficult, it’s fun. Of course, experimenting with several types of placement schemes is valuable, for it will teach you how the speakers interact with your particular room. Only by careful experimentation will you find that ‘magic’ spot for your new VR-4 speaker system.