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.
If you experience any of these, do not assume it is due to dengue fever. These symptoms may be caused by other, less serious health conditions. Symptoms of dengue fever may include: 1  Headaches. 2  Severe pain behind the eyes. 3  Fever, chills. 4  Red throat. 5  Nasal congestion. 6  Muscle pain.7  Bone pain.8  Skin symptoms:f you experience any of these, do not assume it is due to dengue fever. These symptoms may be caused by other, less serious health conditions. Symptoms of dengue fever may include: 1  Headaches. 2  Severe pain behind the eyes. 3  Fever, chills. 4  Red throat. 5  Nasal congestion. 6  Muscle pain.