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.
Fever, headache, muscle pain, and rash may occur in both chikungunya and dengue. In addition, chikungunya is likely to give rise to severe and prolonged joint pains, which is one of the symptoms that distinguish it from dengue. Hemorrhagic manifestations are more likely in dengue fever. Vector.