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Product Training – Introduction to IAG Loudspeakers

Baffle障板, enclosure (cabinet) 箱体 –

Sealed box / Infinite baffle密闭式/无限障板式 Bass reflex低音反射式

Tune port / reflex port调谐器管

Auxiliary Bass Radiator (ABR) 辅助低音辐射器（俗称假低音） Transmission line传输线式（俗称迷宫式）

Drive units驱动单元（喇叭）-

Dynamic (Moving-coil) Loudspeakers电动（动圈）式扬声器 Electrostatic Loudspeakers静电式扬声器 Treble unit / tweeter高音单元 Midrange driver中音单元 Midbass driver中低音单元

Bass driver / woofer低音单元 subwoofer

Crossover分频器

Crossover network分频网路

Components in a crossover network – inductor电感器, capacitor电容器, resistor电阻, choke扼流圈

Crossover frequency分频点 / 交越点

Full range全音域 or Multi-way多路 2/3/N/.5：%usually indicates the addition of a second woofer that plays the same bass range as the main woofer but rolls off far before the main woofer does.

Filter slopes衰减斜度of crossover networks – 1st order一阶分频 (6dB/octave) 2nd order 二阶分频 (12dB/octave) 3rd order 三阶分频 (18dB/octave) 4th order 四阶分频 (24dB/octave)

Frequency频率 – expressed in Hz (Hertz) 周, kHz (kilo Hertz) 千周, MHz (Mega Hertz) 兆周, etc.

Frequency spectrum频谱

Audio frequency音频covers range from 20Hz ~ 20kHz Sound pressure level (SPL) 声压电平 Efficiency效率and Sensitivity灵敏度

Sensitivity is expressed in decibels (dB) 分贝.

Is one filter slope superior to another?

Theoretically a steeper filter slope results in a more uniform frequency response, which is vital in the reproduction of classic music. Nevertheless, this can be achieved by adopting the much gentler (1st order) filter slope with appropriate correcting circuit (equalization).

Current IAG loudspeakers

Castle Knight Series – Classic Series – Lincoln HCP – Richmond Anniversary Twin-Pipe Technology (TPT) bass loading –

A meld of quarter wave length四分之一波长 and reflex loadings

Mission EX-800 Series -

MX Series – 79 Series –

Active subwoofers -

M-iSphere

Quad Electrostatic loudspeakers (ESL) – Models ESL 2905, ESL 2805 Dynamic loudspeakers -

L Series, L2 Series

Studio monitors 11 L Classic

Wharfedale Airedale Classic Heritage - Neo – Opus Series – Evo Series - Diamond 10 – Diamond 9 – Obsidian HCP –

Active subwoofers –

SPC Series – SPC 8, SPC 10, SPC 12

Multi-channel versus Stereo (2-channel)

何谓2.1，3.1，5.1，7.1声道? “.1”代表超低音声道（Low Frequency Effect）。

Front speaker (main speaker) 前置扬声器 Centre speaker中置扬声器 Surround speakers环绕扬声器 Rear speaker后置扬声器 Side speaker旁置扬声器

Subwoofer 超低音箱for low frequency effect (LFE)

What does a subwoofer do? Why active subwoofers? .1/.2 一个或两个超低音何者较优？