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1、 The speaker in the lecture hall needs to be used for a period of time before it can give full play to its excellent performance, which is the so-called "pot". Otherwise, its playback sound will appear too hard and too bright, or it can't be opened tightly. This time process can vary greatly for different speakers, ranging from tens of hours to tens of days.

二、小型書(shū)架報告廳音響由于受物理因素的限制，它的低音動(dòng)態(tài)范圍不可能太大，所以即使它的低頻延伸得很低，其現實(shí)意義也并不大，可見(jiàn)追求小型音箱的低頻下限，實(shí)際效果恐難理想，更不適合爆棚音樂(lè )的重播。

2、 Due to the limitation of physical factors, the bass dynamic range of the small bookshelf lecture hall sound can not be too large, so even if its low frequency extends very low, its practical significance is not great. It can be seen that the actual effect is difficult to be ideal when pursuing the low frequency lower limit of small speakers, and it is not suitable for the replay of burst music.

三、報告廳音響的標稱(chēng)阻抗常見(jiàn)的有4Ω和8Ω兩種，4Ω阻抗的音箱，雖說(shuō)能使功率放大器輸出更大功率，但由于阻抗較低時(shí)，對功率放大器的輸出電流能力要求高，這對一些電源裕量不大的功率放大器往往造成失真增大，而且低阻抗揚聲器對阻尼不利，會(huì )影響低頻控制力。此外某些揚聲器的阻抗在實(shí)際工作時(shí)，于某些頻率可能降低一半值以下，所以還是選阻抗為8Ω的音箱。(例如，不少AV放大器的負載阻抗就不能低于6Ω)

3、 There are two common nominal impedances of speakers in the lecture hall: 4 Ω and 8 Ω. Although the speaker with 4 Ω impedance can make the power amplifier output more power, when the impedance is low, it requires high output current capacity of the power amplifier, which often increases the distortion of some power amplifiers with small power margin, and the low impedance speaker is unfavorable to damping, Will affect the low-frequency control force. In addition, the impedance of some speakers may be reduced to less than half at some frequencies during actual operation, so it is best to choose a speaker with an impedance of 8 Ω. (for example, the load impedance of many AV amplifiers cannot be lower than 6 Ω)

四、小口徑揚聲器單元的報告廳音響雖可以取得非常好的聽(tīng)音效果，但這種音箱只適用于近距離聆聽(tīng)。對于較大空間的房間，譬如廳堂放聲，應選擇采用較大口徑揚聲器單元的大音箱，才能取得好的聽(tīng)音效果。

4、 Although the speaker in the lecture hall with small caliber speaker unit can achieve very good listening effect, this speaker is only suitable for close listening. For rooms with large space, such as auditorium sound, large speakers with large diameter speaker units should be selected to achieve good listening effect.

五、啞鈴式報告廳音響采用兩只相同的中低頻揚聲器單元，在高頻單元兩邊作對稱(chēng)布局，能取得較好的低頻和瞬態(tài)響應、較高的靈敏度和功率承受能力，大動(dòng)態(tài)非線(xiàn)性失真較小，但它的中頻段綜合頻率特性往往產(chǎn)生低谷，而且垂直方向性窄，所以它的中音性能應予注意。不過(guò)有些啞鈴式音箱的下面一只單元僅用作重放低頻，上面一只單元則重放中、低頻，即所謂2.5分頻，上述缺點(diǎn)就能克服。

5、 The dumbbell lecture hall sound adopts two identical medium and low frequency speaker units, which are symmetrically arranged on both sides of the high frequency unit, which can achieve good low-frequency and transient response, high sensitivity and power bearing capacity, large dynamic nonlinear distortion and small, but its comprehensive frequency characteristics of the intermediate frequency band often produce low valleys and narrow vertical directivity, Therefore, its mid tone performance should be paid attention to. However, the lower unit of some dumbbell speakers is only used to replay the low frequency, and the upper unit replays the medium and low frequency, that is, the so-called 2.5 frequency division, which can overcome the above shortcomings.

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