增幅杆
由增幅杆本体和（通常）一个增幅杆夹紧环组成的组件。增幅杆置于换能器与变幅杆之间，用于改变变幅杆的振幅，和/或作为支撑谐振器叠堆的手段。增幅杆的标称谐振频率与其所在叠堆的标称谐振频率相同。
增幅杆通常通过阳极氧化进行颜色编码，以标示标称增益。但该增益可能仅为标称值。以下为多家制造商采用的颜色编码 —
| 颜色 | 增益 |
|---|---|
| 蓝色 | 0.5 |
| 紫色 | 0.6 |
| 绿色 | 1.0 |
| 金色 | 1.5 |
| 银色 | 2.0 |
| 黑色 | 2.5 |
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Booster
An assembly consisting of a booster body and (usually) a booster clamp ring. A booster is placed between a transducer and horn in order to change the horn's amplitude and/or as a means of supporting the resonator stack. The nominal resonant frequency of the booster is the same as the nominal resonant frequency of the stack in which it is used.
Boosters are often color coded by anodizing to indicate the nominal gain. However, the gain may only be nominal. The following are used by several manufacturers —
| Color | Gain |
|---|---|
| Blue | 0.5 |
| Purple | 0.6 |
| Green | 1.0 |
| Gold | 1.5 |
| Silver | 2.0 |
| Black | 2.5 |
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