Postby southside connections » September 1st, 2009, 8:05 am
ok the crossover will work perfectly for you purpose, seeing that it can bandpass filter
the outputs.
speaking from reading the ts parameters and curves + past experience with all the drivers i will be explaining here-
the 18sound 8",8m400 has a very usable range from 150hz to 3.5khz .This will not compensate for anything from 70hz-150hz, where half of the music really exsists
in this case, the fital pro W8N8-200, will get the job done from 70hz- 2khz range, from where the HF driver can pick up
the HF driver,in reality,you don't need a large one, a small simple driver with a usable range of 2khz-20khz (most large hf drivers don't cross 16khz)will be very tolerant if used with the correct flare, which in this case i recommend a 90x 40 degree dispersion, if it's for your dashboard. the hf driver i recommend for this use is the selinium 210/220 ti or the rcf n450.both of these drivers are very capable of getting the job done.
after that, all you need to do is using the x-over, set the midbass at 70hz the hit the bandpass switch and set the highpass at 2khz. This will allow for you to get the midbass from 70hz to 2khz, and the HF drivers from 2khz to 20khz
after this, now it's time for powering them up. the rf 800.4 will work great. bridge at 8ohms.why?-(using the rf amp)
this first one will compesate per speaker
8ohms = 200wrms = 5amps = 40v
vs
this compensates for both speakers bridged-
4ohms = 400wrms = 10 amps = 40v
so basically,a speaker is alot more controled at high ohm levels due to the speaker being an electromagnet and the voltage being the main control over the voice coil, thus higher voltage, means alot less distortion, current draw and alot more output