| 摘要 |
A drum with a vibrating membrane for producing sounds in a range of low to high resonant frequencies including a drum shell with a first open end and a second open end, a drumhead, including a vibrating membrane, covering said first open end, a cover with a threaded opening extending across and secured to said second end, and a resonant member having a first end and a second end, with the first end having a threaded means for detachable coupling with the threaded opening in the cap in airtight relation to enhance and manipulate the low resonant frequencies independent of the high resonant frequencies upon the striking of the membrane.
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