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.
1 Dengue fever is a disease caused by a family of viruses that are transmitted by mosquitoes. 2  Symptoms include severe joint and muscle pain, swollen lymph nodes, headache, fever, exhaustion, and rash. 3  The presence of fever, rash, and headache (the dengue triad) is characteristic of dengue fever.
Dengue. Dengue refers to a tropical disease caused by four different types of virus. It is usually transmitted by mosquitoes and the common symptoms include fever, headache, muscle and joint pains and skin rash.iagnosis. Diagnosis of dengue is usually done based on patientâs symptoms and physical examination, especially in endemic areas. A probable diagnosis is made on the findings of fever with the following symptoms: nausea and vomiting, rash and generalized pain.