Crossovers -- How they interact

I've never heard of this before, anyone else? Doesn't really make much sense to me, but Xovers are some strange things, so I really wouldn't know, but I've run this way for quite some time, never had a problem, and generally it seems to just start at the higher point and then kill everything solid at the lower one. Actually the maind reason I generally do this is because An old deck I had liked to lose its settings quite regularly, so I never fully trusted it's crossovers, thatway having an extra one set on the amp, it wouldn't try to blowup my speakers.

 

hmmmm Now I could be Wrong, (which is VERY VERY VERY VERY VERY VERY VERY VERY rare .. did I say very rare???)

but if you Take a Signal... Pass is through a crossover and attenuate certin Freq's and then pass it through another Crossover it will only serve to attenuate those Freq's more

To Elaberate using the above numbers

the HU would Attenuate all Freq's under 80hz at 26db/octave and send it to the amp

the Amp would then get and process the already attenuated Signal from the amp
then the sound processors would then attenuate all sound 60hz at what ever rate those crossovers were made, probally 18db/octave

that is what LOGIC would say........

 

I should also note that playing with the limited tools at my disposal, I've never seen any results that would say anything different. Also, if there's such a limited signal reaching the amp below 80hz in the first place, how's it going to somehow find signal down to 30hz or so to amplify?

If I'm not mistaken CDT's newst crossover technology seems to do just exactly this as well. has a mellow sloped beginning, then rollsoff sharply by adding a 2nd crossover at a slightly different frequency.

 

Hey does anyone know if they ever got around to making all those speakers they had ppl pre-order? Or even the amps? I haven't heared any buzz about it FIguredsomeone would post SOMETHIGN somewher eon the web. I'd check their forum myself, but y'kno.. that whole being banned thing.

 

thats exactly what i used to think, however, from reading various tech papers, i was wrong

 

I split the topic so maybe we can get some more discussion on this

Link me to the Tech papers that Defy Logic

 

This is very interesting! I like most you, have always thought that using two crossovers would just in fact attenuate even more. Maybe not?

 

well, over in eDland everything works different. Crossovers don't apply to them the way they'd apply to normal, rational speakers.

Sorry, I'm bitter. BLAH. principal...

 

I was just thinking about something. What about passives for components. If we were say using a 80 HPF on the HU, wouldnt' that fuck with the crossover points on the passives? Say the crossover point on it is 3500hz, high and low. wouldnt throwing that HU crossover in there mess it up? If this whole conspiracy were true anyhow.

Something to think about.

 

mike, i have to go digging around. i know there is a reference to it in the car stereo cookbook. let me see what i can dig up...

 

not really, we would just be attentuating freq's below 80hz. the component crossover would still do it's intended job

 

" crossover frequencies shift to lower values when you combine 2 crossovers - about 20% below the nominally selected frequencies"

car stereo cookbook - there is some more online somewhere, i just don't remember. maybe in the adire white papers?

 

hmm, when highpassing, does that raise the frequency ?