Why this tweeter phase not inverted?

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andy2

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Joined 2004
#1
I am trying to rework the original Eros MKI xover version:
http://www.speakerbuilder.net/web_files/Projects/Eros Project/ersoxo1.gif

The original xover is too bright in my opinion.

Usually in 2 order, the tweeter's polarity is inverted but in this xover, it is not. Could someone explain why?

I try to put a 1ohm resistor in series with the tweeter xover but it attenuates the midrange too much.

I did some quick spice simulation and the simulation show the phases are inverted at the point of xover.

I am trying to do two things: move the xover freq. to around 2Khz and at the same time add a some attenuation to the tweeter.
 
#2
It's doubtful that the total acoustic slope is second order (drivers are rarely flat near crossover). It is also doubtful that the two drivers have the same zero-delay plane. So the simple assumption that they should be wired out of phase may not be correct.
 
#3
andy2 said:
I try to put a 1ohm resistor in series with the tweeter xover but it attenuates the midrange too much.
Click to expand...

Then try putting an RC across the tweeter. Maybe start with 1uF and R=same as tweeters DC resistance.

This will make the crossover C more effective at the higher frequencies, (not that it has much effect there), and it will also present a more balanced load to your amp which may tame a harsh top end.

Play with these values, try this first.

You cannot simulate a crossover in spice without considering the load your speaker presents. It is not a resistor, it is a complex load (not complicated :- reactive). Youll need to do two electrical and two acoustic measurements per driver, and use a crossover sim.
 
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