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.
Dengue fever symptoms. Dengue fever is a disease that features muscular aches and pains, fevers and often is accompanied by a fine petechial or pin-point rash. Severe cases of Dengue can progress to Dengue Hemorrhagic Fever (DHF) where the victim suffers from massive bleeding, frequently from IV sites, gums and rectum. People generally progress to DHF when they have been previously infected by Dengue, earlier in their life.