clubmyke |
09-19-2004 10:27 AM |
adding a sub to a tower is kinda tough...it is not a efficent design. <BR> <BR>the more a sub is reinforced with another plane - the louder it gets.....( adding a surface close to or around the sub adds 3db... 3db is liken to doubling your amp output...) <BR> <BR>that is why speaker sound like crap when they are not mounted to anything..subs in most(99%)installations need reinforcement <BR> <BR>so when you enclose them and place them by/on the floor(+3db) and then place them toward a corner(2 walls - add +6db) and have a close ceiling (another +3 db)....you just picked up 12 db.....which is HUGE !!!!!! <BR> <BR>that means a sub(on the floor, by the corner, with a close celing-400 watt amp) will sound just as lound as a sub with the 1600 watt amp out in the open. and in this case louder... <BR> <BR>bass waves are very, very long. ( take 550 and divide it by the frequency and that will give you the length. <BR> 40 htz note will have a 14' length, <BR> 30htz note will have a 18' lenght, <BR> 20 htz note will have 27.5 ' length !!!!! <BR>(that is why most car systems sound louder with lower frequencies outside of the car) <BR> <BR>generally speaking, since low bass is non directional ( must have the crossver point below 80hz) you can pretty much out the sub anywhere. so a custom isoberic with 2 10's requires very little space(hovever alot of juice jl class d amps work great) and will actually sound and feel better since it will use the long sound waves can travel througout/inside the boat. <BR> <BR>here are the drawbacks..... <BR> <BR>the subs will rattle anything that in the boat that is not mechanically grounded or secured <BR>the mid/higs will have to be delayed 3-5 milliseconds ( the mids and high will reach your ears much faster than than a bass wave..so they need to be "delayed" till the sub wave can make it out and not "cancel" out around the crossover frequency ( most car systems suffer from a lack of midbass in this freqency range) <BR> <BR>the high eclipse and alpine decks will allow for the altering the phase and/or delaying the phase so the all the freqencies make it to you at the same time. <BR> <BR>hope that helps, <BR> <BR>mike <BR> <BR> <BR> <BR> <BR> <BR> <BR> <BR> <BR>
|