Crossover Settings
 

Low Pass Variable Controls for 3+4 channel
47Hz to 4.7kHz

Low Pass Variable Controls for 5 channel only
47Hz to 470Hz

High Pass Variable Controls
47Hz to 4.7kHz

what exactly do these adjustments do and how do i know im getting the best sound & deepest bass i can get??

http://home.nyc.rr.com/cplex2/audio/audio.html

Just to start from the very basic beginning:

Crossovers are basically intended to block certain frequencies from getting to a speaker. The less a speaker has to try and replicate frequencies outside of it's effective range, the better it will sound. In other words, the less a tweeter has to try to replicate 50 hz bass notes, the clearer, sharper, and cleaner the highs will be. The less a subwoofer has to try and replicate 10,000 hz trumpet notes, the more solid it's impact will be.

A "Low-Pass" crossover allows frequencies below the crossover point to pass, and blocks frequencies above the crossover point.

A "High-Pass" crossover allows frequencies above the crossover points to pass, and blocks frequencies below the crossover point.

So, you want to get speakers whose "frequency ranges" overlap slightly, and then you want your crossover settings to match where those ranges overlap. Component speaker sets that come with separate crossovers already have the high and low pass crossovers set optimally for the tweeter and midrange, and you don't have to worry about it. For the subs on separate amp channels, you have to figure out where the frequency ranges for the component and sub speakers overlap (the instructions with the speakers should have frequency ranges listed). This is normally between 80 and 120 HZ. For example, if you decide on 100 hz, you set the channel driving the component set to high-pass and adjust the crossover point to 100, and set the channel driving the sub(s) to low-pass, and adjust the crossover point to 100.

Then, you can listen for some days, and try adjusting the crossover point higher or lower, to see what sounds better to you. There is a LOT more to this. A LOT MORE. But these are the basic steps to start with.

---jps

now that i think i think i understand the basic concept of crossovers, until which frequency would you say i should let the sub handle for 'maximum impact'? i think i have it set to 68Hz right now.I have no idea where my speakers (coaxial not component) manual's are. if i have (Low Pass Variable Controls for 5 channel only) set to 68hz what should (Low Pass Variable Controls for 3+4 channel) usually be a good starting point? .....also i have seperate tweeters that are connected to the factory amp(not bose) which have seperate crossovers.....

The next thing to know about crossovers is that they don't completely cut off music above the crossover point on a low pass (or below the crossover point on a high-pass). The crossover will roll off the farther away from the crossover point the frequency is. How much depends on the "slope" (6 db, 12 db, 18 db, etc. etc.).

So, you can start with putting the high-pass crossover at 68 to match the setting of the low pass. And you can try setting the high-pass higher, and both the subs and coaxials will still be playing frequencies between those two settings, just not as loud. This is a part of trying to see what works and what sounds better.

But if you go too low, then the coaxials (which are already suffering from not having a crossover to block high frequencies) are going to suffer. You'll have the real real low bass, but very very few coaxials will be able to be effective down to 68 Hz. But if it works, it works.

---jps

whats the difference between Low Pass Variable Controls for 3+4 channel/Low Pass Variable Controls for 5 channel only? is the 5 channel just for adjusting the sub and the 3+4 for the 4 coaxials? i dont wanna play with them to much, im afraid ill mess up the sound to much.i think one is on 68 and the other on 100....