| 摘要 |
<p>An improved sound output system includes a primary amplifier (12) having an audio output (14), main speaker (18) connected to the audio output, an attenuator (26) connected to the main speaker for producing a low-level attenuator output, an auxiliary amplifier (32) operatively connected to the attenuator output, and an auxiliary speaker (38) operatively connected to the auxiliary amplifier (32). The connection of the attenuator input directly to the main speaker input provides a particularly useful combination whereby the audio output of a primary amplifier that is designed for driving a speaker is used for that purpose, yet greatly enhanced output is available from the auxilairy amplifier and speaker, without introducing significant distortion. The attenuator input can be provided with a frequency-responsive filter for operating the auxiliary amplifier and speaker within a desired frequency range. The system can have a crossover network for separating frequency components of the primary amplifier, main speakers of appropriate frequency response being connected to different frequency response outputs of the network, the attenuator input being directly connected to one of the main speakers for feeding a desired composent of the amplifier output to the auxiliary amplifier. Low, mid, and high frequency enhancement is provided by separate auxiliary attenuator, amplifier and speaker components. A slight delay between the primary amplifier and the output of the auxiliary amplifier permits high levels of sound output but with reduced potential for listener discomfort.</p> |
