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 fever is an acute viral disease, caused by mosquitoes carrying dengue virus. It is characterised by skin rashes, high fever, severe headache and muscles aches throughout the body.Among other symptoms of dengue fever include diarrhoea, vomiting and chills.engue fever is an acute viral disease, caused by mosquitoes carrying dengue virus. It is characterised by skin rashes, high fever, severe headache and muscles aches throughout the body.