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-   -   Custom made passive x-overs (http://www.diyaudio.com/forums/multi-way/135141-custom-made-passive-x-overs.html)

RacerXtreme 19th December 2008 09:53 PM

Custom made passive x-overs
 
Anyone know where I can get passive x-overs made ?

I need a 2-way (500Hz) and a 3 way (333Hz and 1.8kHz) hopefully w/ something steeper than 12 db/ octave.

tritosine 19th December 2008 10:15 PM

http://www.diyaudio.com/forums/showt...hreadid=127817

sejati 20th December 2008 04:51 PM

Custome made passive x-over
 
I can make design for those cross over, for reasonable price for you, But please give information what driver do you want to use, moreover if you have the datasheet of those driver, so design will be based on the data. Otherwise I will find the datasheet over the internet by driver type you have.

John_E_Janowitz 20th December 2008 05:11 PM

The problem is that there is much more to a crossover than getting the right points and slopes because a driver is not a purely resistive load, nor does it have a perfectly flat response curve. You need to take into account the impedance curve and measured response. This is determined not only by the driver, but the enclosure, placement on the baffle, etc. You need to take into account phase between drivers which is determined by their placement with relation to the other drivers, etc.

There is also a lot more than getting just a flat frequency response. You need good phase coherency throughout the crossover region. The ONLY way to do that properly is to build your enclosure, mount the drivers and then used the measured response and impedance curves to simulate, build, and then verify the crossover. Flipping the polarity on a driver and looking for deep nulls at the crossover point is a good first indicator of a correct phase relationship. You also need to look at off axis measurements, impulse response and CSD. Small changes in component values won't have a significant effect on frequency response most of the time, but they can have a fairly significant effect on phase. Getting the phase correct in a crossover is IMO as important or even more important than getting response correct. It's very possible to have a flat response curve but for things to not sound at all right.

John

sejati 21st December 2008 05:54 PM

Yup, as for me I always design for in-phase to all driver. especially for those in x-over point. Event for designing those different location driver, different phase lead-lag must took into consideration.


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