combine active xo and parametric eq

[tinitus]

Originally Posted by tinitus

how much do you know about speaker design ?

did I say that ?
I just thought it was ok to ask

but when you are experienced with speaker design, then I dont understand why you focus on precise matching of the electronic side only
its been a while since speaker design have moved beyond that
or do people still think the active design is so superiour that they are 'in the clear'

[tinitus]

Originally Posted by AndrewT

Make a list and I will tick off all the bits I do know a little about. I can assure I will not be able to tick off that many but that does not help you in any way.

Andrew, are you saying that you do not know much about speaker design
am I reading you correctly here

[AndrewT]

I usually make it clear in my posts between guessing and my opinion and facts and regurgitating other's observations.

If you look up Linkwitz you will find just about every EQ and crossover arrangement you could ever require.
Note particularly the difference between crossover and driver EQ.
The driver EQ must be designed and implemented for that driver. Nothing else outside that matters. Move the crossover frequency and the driver EQ stays the same.

Does that sound like I know nothing? If it does then, as I suggested earlier, sort the wheat from the chaff

how much do you know about speaker design ?

you asked the question, now you have to decide. Hopefully others will come in to support or not. That makes your job even more difficult.

[tinitus]

ah, Linkwitz, yeah, ok

driver EQ ? you mean woofer bass EQ ?
well, thats not even being considered yet

making my job even more difficult ?
yeah, surely, and why not
if I wanted it easy, I wouldnt be here at all

btw, Linkwitz is making fixed custiomised crossovers, by caculations and measurements, and not variable ones, right ?
I could choose to do that, but will focus on a variable filter

besides, the way linkwitz does it looks a bit different from what I see elsewhere
different solutions to the same thing, or ?

but Im not arguing which way is good or better, not at all
and as said, maybe it doesnt get any further than this
if its all about reading Linkwitz, and anything else just guessing, then it surely wont

if you are interested, its good
and if not, thats fine too
its not something I desperately need to do
I just thought it might interest others too

[tinitus]

Originally Posted by AndrewT

Does that sound like I know nothing? .

about speaker design ?
if thats all, Im sorry to say yes
its bettert than nothing, but not really much either

Im sure you could tell me how the active filter works, in every detail
and it would all be of very high value to me
but without the understanding of how the speaker functions, it wont really be the info I need
then I could just as well buy a plug and play thing

[joexswj]

Originally Posted by tinitus

I cannot believe fixed xo points work well with any speaker units



well, I do know its 'immune' to the usual issues with varying impedance
which is a real big issue with passive xo
but it still does not deal with frequency changes
with all properly designed passive crossovers, the acoustic slopes have top priority
but obviously not so with active xo

that xo point can be change, and xo schematic should use a buffer

[tinitus]

Originally Posted by joexswj

....... and xo schematic should use a buffer

yes, ESP project125, 4way xo, seems more complete

looks like plenty of options to do the xo/EQ combo thing

Project 125

big question is still how, or maybe even why

[brig001]

I'm not sure I am understanding this fully, but I am currently trying to make an two way active crossover where I can vary the crossover frequency and order (and therefore phase) for each way. The best setting I have so far is first order (ish) for the woofer - I think it is already rolling off first order on its own, and second order for the tweeter. This arrangement seems to get better phase between the two drivers than second order on each.

Is this something like you are trying to do?

Brian

[AndrewT]

Project 125 is a crossover

4-Way Linkwitz-Riley Crossover (LRX424)

It does not have any EQ.
It does not show what may need to be done to correct for driver anomalies.

[tinitus]

Originally Posted by AndrewT

Project 125 is a crossover
It does not have any EQ.

sure it does
just takes a few minor changes

remember, my goal is a 3way xo
with 24db high pass
and 12db low pass, with EQ

should leave plenty of room and option for that, or what ?