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.
What is dengue fever? Dengue fever is an infectious viral disease caused by the bite  of infected mosquitoes.   Symptoms are sudden onset of high fever, severe headache, extreme  joint pain (â¦ thus the vernacular name, bone break fever).  Note that DF is comparatively rare and rarely fatal when it does  occur..engue fever is an infectious viral disease caused by the bite  of infected mosquitoes.   Symptoms are sudden onset of high fever, severe headache, extreme  joint pain (â¦ thus the vernacular name, bone break fever).  Note that DF is comparatively rare and rarely fatal when it does  occur. .