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.
With each infection of a new strain of Dengue, a person is increasingly like to contract Hemorrhagic fever. After being bitten by an infected mosquito, it usually takes 5-7 days for the first symptoms to occur.Common symptoms include fever with headache, severe muscle pain, joint pain and rashes on the body.Until now, there has been no effective medicine or vaccine for dengue.ith each infection of a new strain of Dengue, a person is increasingly like to contract Hemorrhagic fever. After being bitten by an infected mosquito, it usually takes 5-7 days for the first symptoms to occur.