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.
Symptoms of Dengue. You can notice the symptoms of dengue in 3 â 6 or within 15 days after being infected. The symptoms can happen in stages. Usually, the symptom starts with a chill, then headache, pain in the movement of eyes, followed by a low backache and loss of appetite.