chhanthony 發表於 2014-12-3 11:30 static/image/common/back.gif
請問點解要用全頻?
頭頂會多左浸野
其餘唔需，因交俾十仔處理
我理解係咁
其他的已交由sub仔處理，是否天花的聲音則要自身負責？我未見有如此提及，請Ching 賜教。{:6_183:}
pac 發表於 2014-12-3 11:45 static/image/common/back.gif
玩ATMOS不同一般杜比,天花喇叭用全頻可以使上音場低頻配合整體環境,
整體包圍感也會有幫助,比如洩聽三頭 ...
冇天花喇叭做到40Hz
Klipsch KL-750 THX in Ceiling speaker, 45-20kHz =/- 3db
http://www.klipsch.com/kl-7502-thx-in-ceiling-speaker
wadee 發表於 2014-12-3 12:44 static/image/common/back.gif
頭頂會多左浸野
其餘唔需，因交俾十仔處理
我理解係咁
Overhead speakers 低頻交畀subwoofer處理不可以嗎?
本帖最後由 qq1122yq 於 2014-12-3 15:33 編輯
超低頻本身係一條獨立ch，在錄音上是分拆出來，所以被稱為.1
雖然仲未有機會和祥細研究過atmos，但理論上只要做到經常提及的“低頻定位”
不論你左爆右爆、上爆下爆，低頻一樣可以做到由上而下、由下而上的...
所以理解上天花喇叭是不需要全頻，而是否需要全頻等同其它聲道要求一樣
{:1_258:}
有錯請打胸！( . )( . )
謝謝各位及Q姐
本帖最後由 chhanthony 於 2014-12-3 16:03 編輯
其實有心玩Atmos嘅朋友用少少時間睇晒呢兩份嘢就會有答案
Dolby® Atmos® Specifications
http://www.dolby.com/us/en/technologies/dolby-atmos/dolby-atmos-specifications.pdf
Dolby Atmos® Home Theater
Installation Guidelines
http://www.dolby.com/us/en/technologies/dolby-atmos/dolby-atmos-home-theater-installation-guidelines.pdf
其實Dolby建議係所有喇叭都係全頻及同一型號就最理想:-
Characteristics
Dolby Atmos audio is mixed using discrete, full-range audio objects that may move
around anywhere in three-dimensional space. With this in mind, overhead speakers
should complement the frequency response, output, and power-handling capabilities
of the listener-level speakers. Choose overhead speakers that are timbre matched as
closely as possible to the primary listener-level speakers. Overhead speakers with a
wide dispersion pattern are desirable for use in a Dolby Atmos system. This will
ensure the closest replication of the cinematic environment, where overhead
speakers are placed high above the listeners.
但亦知最唔可行，最不設實際，所以even佢畀戲院用嘅recommendation都有咁寫:-
4.5 Surround Sound Frequency Response: 40 Hz to 16 kHz, +3/–6 dB
Dolby Atmos auditoriums must support playback of full-range surround signals. To meet this specification standard, cinema
surround loudspeakers with limited bass response require bass management. If bass management is used, the surround
loudspeakers frequency response (±3 dB) must extend to 90 Hz or lower. The crossover frequency should be set based on
the capabilities of the surround loudspeakers, but must not be higher than 100 Hz.
總括嚟講所有喇叭最好用同一型號，而是要分頻將低頻交畀subwoofer處理就視符喇叭規格同擴音機效能而定。
just my 2 cents。
yuppi 發表於 2014-12-3 13:43 static/image/common/back.gif
冇天花喇叭做到40Hz
所以我諗住用書架喇叭掛天花
pac 發表於 2014-12-3 11:45
玩ATMOS不同一般杜比,天花喇叭用全頻可以使上音場低頻配合整體環境,
整體包圍感也會有幫助,比如洩聽三頭 ...
尺寸重量振动.天花喇叭比任何喇叭更不适用全频`即使频响可以做到:也应该Set高分频点
