salu 在 2003-12-17 20:49:07 发表的内容
madog 在 2003-12-17 17:56:32 发表的内容
salu 在 2003-12-17 13:00:20 发表的内容
[quote]madog 在 2003-12-17 10:25:30 发表的内容
[quote]madog 在 2003-12-16 3:48:54 发表的内容
[quote]阿泰 在 2003-12-15 11:06:45 发表的内容
那天大昌的展示，因我找不到坐的位置，前后左右地站过不少地方，但不管我身处展厅的那一个位置，都会被那妙不可言的音乐所打动，太正点了，非笔墨可以形容。 |
And this is what we called the dispersion. That means the speakers have
a character of better directivity. To elaborate this directivity, it means,
theoritically, the speaker should disperse the full spectrum within the angle
of at least 90 degree evenly. If the speakers sound peaky somewhere in
the mid to high frequency, then the speaker becomes beaming. We
called it beaming effect which is not good for hi fi reproduction.
A good directivity is comes from speaker itself that means the entire spectrum is evenly distribute into the air. Sometime the pros system have serious
feedback howling when talking or singing through mic, is simply due to
bad directivity. The peak has a much stronger energy(sound level) that eventually inject into the microphone then howling occur.
Even though you have a good speaker of good directivity character, yet,
peaky sound might come from electronics of bad design such as amps,
sound source, or perhaps cable would affect or generate peaky sound.
This is what we called noisy, irritated to our ears.
Your feel in that day is a result of wide dispersion of sound that whereever you stand, the music is there. This also count on the energy level of mid and high frequency.
Some system won't go far because their mid and high energy is less than
ideal. We can almost determine that the system is lacking harmonics and
add up together, the system has no penetration power.
To be honest, these are thing that Mr. Chan told me.
Once again, I am not Mr. Chan but if you guys giving him credits, I'll turn
around to let him know as I think he deserved the credits.
Thanks once agin your comment, I'll tell Mr. Chan.
By the way, I don't think Mr. Chan would have time to join us in this forum.
|
I had missed out something on my post. When I said DIRECTIVITY,
that is not enough or it is not right.
The term DIRECTIVITY should be written as
CONSTANT DIRECTIVITY
Sorry folks, excuse me of being misleading. |
既然擁有完美擴散和指向性，請順便講解一下音箱擺位内拗的用意？
Some system won't go far because their mid and high energy is less than ideal. We can almost determine that the system is lacking harmonics and add up together, the system has no penetration power. [/quote]
The focus of any instruments or vocal is determined from the original recording, such as a music CD and it was tuned or pan to the proper position by the recording engineer(s) who according to his equipments in the studio.
In other word, recording engineer(s) uses his or their equipments as
recording reference.
The center image or focus was then determined by the engineer. It's
rather simple, if engineer(s) give both channel same amount of level, then when we playback at home, the solo vocal or instrument will be in the
center position. This is the fact of phasing and I am not ready to talk about
in this forum because it would take a long hours to explain.
Back to our hom, when we cannot obtain the sharp focus while the
speakers were being face straight forward, more or less, I would assume,
the system may have insufficient mid to high frequency energy as most of
the solos are in the range of mid to high frequency. Toe-in your speakers
would help a lot. If so, the system's constant directivity may be less than
ideal. But for most audiophile, it is difficult to find out which link is to be
blamed.
In a really good system, one can easily find sharp focus even the speakers are facing strgith forward. Of course, the distance between 2 speakers
must be carefully adjusted
For initial speakers setup, you may put 2 speakers further apart, play a
vocal and find out the focus of the mouth. If the speakers were too distance away, you will find hollow in the middle, this implies insufficient of frequency energy that mostly mid & high register.
You may drag them closer till you find a sharper focus. However, toe-in your speakers is the most effective and easy way to obtain the right focus.
Back to the constant directivity.
If the system really achieve a near perfect constant directivity (including the speakers and electronics), you are able to put your speaker face forward to obtain a proper focus.
There is another case, for example, in case your speakers are OK, but if you have a really bad electronics, then this does not hold truth as the speakers need a full spectrum to satisfy the sound field.
Now, if a less than ideal electronic is not able to correctly reproduce harmonics, the instruments or vocal is not completed as the original sound
source, then it cannot penetrate very far in the air. You might imagin the air is a pool of water that will provide damping and of course water has a much higher density, but the phenominum is similar.
At last, hey guy, I like your attitud and this is the ways for working out problem.
Cheers and happy listening
[/quote]
ok,由於周邊器材的素質，影響了聚焦，内拗是最有效的解決方法，我接受您的解釋。
下一個問題：
音箱的内拗，會導致還原出來的音場扭曲嗎？結像的位置與錄音所要表達的一致嗎？改變是可聞性的嗎？[/quote]
Very good question.
Yes, if you toe-in your pairs of speakers, the sound stage is twisted but
I don't regard this is sort of distortion.
When the speakers were toe-in, the sound stage becomes deeper but
in the trading off of width.
Remember, the sound stage your system produced can be look at it as
an energy field. In a certain period of time, this sound field can be
imagined as a big ballon, if you squeeze the ballon by your hand
horizontally then the ballon will become narrower but deeper.
There is no free lunch in the real world.
This comments had been written by Mr. Chan long time ago in the audio
magazine say some time 18 years ago.
I should advise him to pick up his pen and write again but I think the
chance is almost zero.
Toe-in is mostly not true to the original recording technique as almost every studios monitor are face straight forward, in particular the way that engineers using single source technique for their recording. (that means only
a pair of microphone hanging over the orchestra such as the famed B&K
microphones, their pair of mic are face straight forward to the orchestra.)
However, I didn't mean tow-in is not good, as when some system is less
ideal (again, nothing is perfect).But just a way to judging the performance
of a system. There is no big deal if one's system has to toe-in for the depth
and focus.
Cheers and enjoy music
