1. Empty paper cone speakers can effectively reduce speaker vibration amplitude.
As shown in Figure 4 and Figure 5, the inverted speaker system separates the speaker from its environment due to the equivalent compliance (Cm) of the port. This causes the speaker to behave as if it's in free space at ultra-low frequencies, resulting in large vibrations and higher distortion. In contrast, the empty cone speaker couples the speaker with the cone, creating an effect similar to a sealed enclosure. This significantly reduces vibration amplitude and allows for deeper bass with less distortion. As a result, the empty cone speaker suppresses unwanted vibrations across the entire frequency range, making it more efficient and controlled.
2. Empty paper cone speakers offer higher sensitivity in the low-frequency range.
Inverted speakers suffer from cancellation effects between the front and back radiation, especially at lower frequencies, leading to significant attenuation. However, the empty cone speaker adds an acoustic load that prevents air leakage, allowing better sound pressure output. This results in a flatter frequency response with a steeper roll-off, giving the speaker a more defined and powerful low-end performance.
3. Empty paper cone speakers allow for larger cone sizes without compromising internal volume.
Unlike inverted designs, where increasing the port size limits the available space inside the cabinet, the empty cone design is not restricted by surrounding structures. This makes it possible to use larger cones, which can improve low-frequency extension and efficiency. Additionally, the reduced airflow noise and increased linearity contribute to better sound quality and control over the entire frequency range.
4. Installation flexibility is a major advantage.
The empty cone device can be placed anywhere, such as on the bottom or back of the speaker. This setup minimizes floor interference and improves sound imaging and positioning. It also allows for better utilization of room acoustics, enhancing bass performance through floor reflection. Overall, the installation location has minimal impact on sound quality, making it a versatile option for various speaker configurations.
While the empty cone speaker offers many benefits, there are some trade-offs. It typically costs more than an inverted system, and the increased Q factor may require careful tuning to avoid resonance issues. Some users also report slower transient response in the very low frequencies, but this is often subjective and can be mitigated with proper design and tuning. With attention to detail and accurate parameter selection, the empty cone speaker can deliver excellent performance and is a strong contender in high-fidelity audio systems.
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