JBL会议室音箱　Control 25AV

? 适用于靠近视频监视器必须有磁屏蔽扬声器的用户
? 非常平顺的频率响应特性
? 可靠衡恶劣环境的不锈钢网罩
? 既可直接使用8奥姆低阻抗连接，又可使用60W插入变压器连接到70V或100V定电压传输线路
? 声音保镖专业技术的过载保护
? 130mm(5 ?”)聚丙烯榭酯涂覆的低音防水扬声器和20mm(?”)钛合金涂覆震膜的高音号筒扬声器
? 隐形球(Ibcludes InvisBall)TM 防盗安装硬件和密封的输入面板盖
? 螺柱输入接线端子
? 100° x 100° 高音号筒
频率范围(-10dB)1 70Hz～23kHz
中频率范围(±1.5dB，典型值)2 130Hz～14kHz
100小时功率处理能力 连续节目功率 200W
(±1.5dB，典型值)3 连续粉噪声率 100W
标准覆盖角 100° x 100°
声压灵敏度4 87dB SPL， 1W@1m(3.3英尺)
蕞大声压级@1m 连续峰值粉红噪声 113dB
连续粉红噪声平均值 117dB
连续音乐或语言节目平均值 103
指向性因子(Q) 4.9，500～4kHz 的平均值
指向性指数(DI) 6.9dB，500～4kHz 的平均值
一般阻抗 8Ω
蕞低阻抗 6.7Ω，在 230Hz
分频器类型 2 谐低通滤波器，2 谐高通滤波器以蕞大的平坦响应优化复合
变压器插头 70V：60W，30W，15W，7.5W
(插头位置为4#，3#，2#，1#)
100V：100W，30W，15W
(插头位置为4#，3#，2#)
直通位置 8Ω

换能器(扬声器单元)：
低频扬声器 130mm(5.25英寸)，由聚丙烯涂覆，四边用 JBL 抗气
专业技术端封的低纸盆和用凯帕通(Kapton)而搞温骨架
娆制的 25mm(1英寸)音圈组成的低音扬声器单元
高频扬声器 20mm(0.75英寸)钛合金覆盖的碳酸酯高音
振膜组成的高音号筒扬声器

物理特性：
箱体材料 高压聚苯乙烯
面板纲罩 与箱体颜色相成的黑色或白色的不锈钢网罩
过载保护 满功率限制保护分频网络和扬声器，异常
过载内部熔断器保护
抗气候环境 湿度、盐雾、温度和UV超过军标 810 和
IEC S29IP-X4 防溅泼等级
接线端子 镀锌纲柱端子和锌镍纲螺母
安全认证等级 变压器通过 UL1876 标准
颜色 黑色或白色(-WH)
旋转角度 隐形球挂壁安装：
垂直 37°，水平 44°
托架安装：全方位可旋转 44°
体积(高x宽x深) 236x186x195mm (9.3x7.4x6.3英寸)
重量 4.0公斤(9磅)
运输重量(对) 9公斤(20磅)/对

  James Bullough Lansing was born James Martini, 14 January 1902, in Macoupin County, Millwood Township, Illinois. His parents were
Henry Martini, born in St. Louis, Missouri, and Grace Erbs Martini, born in Central City, Illinois. The elder Martini was a coal mining
engineer, and his work required that the family moved about quite a bit during Lansing's early years. Lansing was the ninth of fourteen
children, one of whom died in infancy. For a short time, Lansing lived with the Bullough family in Litchfield, Illinois. He later took their
name when he changed his from Martini to Lansing.
Not much is known about Lansing's early days, and we are indebted to Bill Martin, one of three surviving brothers, for providing most
of the information presented here. Lansing graduated the eighth grade at the Lawrence School in Springfield, Illinois. He also attended
the Springfield, Illinois, High School. Later, he took courses in a small business college in Springfield.

As a young lad he was very interested in all things electrical and mechanical. At about the age of 10, he built a Leyden Jar which he used
to play pranks on his playmates. He also constructed crystal sets, and at one time, probably about the age of 12 or so, built a small radio
transmitter from scratch. The signals from this set were apparently strong enough to reach the Great Lakes Naval Station in Illinois; naval
personnel determined the source of these signals and later supervised
the timely dismantling of the young Lansing's radio transmitter.

For a while Lansing worked as an automotive mechanic, specializing in fine engine repair work. He attended an automotive school for
mechanics in Detroit through the courtesy of the dealer he worked for in Springfield.

Lansing's mother died 1 November 1924 at the age of 56, and at that time Lansing left home. As best we can determine, he went directly
to Salt Lake City. Mrs. Lansing, the former Glenna Peterson of Salt Lake City, tells of meeting Lansing in 1925 in that city. At the time he
was working for a radio station as an engineer. In addition, he worked for the Baldwin loudspeaker company in Salt Lake City for a time.
He also met his future business partner, Ken Decker, in Salt Lake City.