The trick in building a vented box is to get the right size enclosure and the right size vent. You can't be too far off on either of these factors or your speaker's performance will suffer. In particular, using a too-small box or a too-high vent tuning frequency can eliminate bass instead of increasing it.
Symptoms, which usually begin four to six days after infection and last for up to 10 days, may include. 1  Sudden, high fever. 2  Severe headaches. 3  Pain behind the eyes. 4  Severe joint and muscle pain. 5  Fatigue. 6  Nausea. 7  Vomiting.
Previous dengue infection increases the risk for DHF in a patient with subsequent dengue infection. Dengue shock syndrome is DHF with signs of circulatory failure, including narrow pulse pressure (. 20 mm Hg), hypotension, or shock, and can result in a case-fatality rate of approximately 10% (8).revious dengue infection increases the risk for DHF in a patient with subsequent dengue infection. Dengue shock syndrome is DHF with signs of circulatory failure, including narrow pulse pressure (. 20 mm Hg), hypotension, or shock, and can result in a case-fatality rate of approximately 10% (8).