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 affects the body by causing a high fever and flu-like symptoms. The virus infects your blood and causes a migraine-like headache, rash, achiness, queasiness, tiredness and fever.t can affect the blood, causing mild bleeding of the gums, and you may bruise easily. Once you have recovered from dengue fever, antibodies are left in your system, making your reaction to the disease more severe if you are infected a second time.