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.
If you experience any of these, do not assume it is due to dengue fever. These symptoms may be caused by other, less serious health conditions. Symptoms of dengue fever may include: 1  Headaches. 2  Severe pain behind the eyes. 3  Fever, chills. 4  Red throat. 5  Nasal congestion. 6  Muscle pain.7  Bone pain.8  Skin symptoms:f you experience any of these, do not assume it is due to dengue fever. These symptoms may be caused by other, less serious health conditions. Symptoms of dengue fever may include: 1  Headaches. 2  Severe pain behind the eyes. 3  Fever, chills. 4  Red throat. 5  Nasal congestion. 6  Muscle pain.