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In the Forum: Audio Discussions
In the Thread: Macondo’s MiniMe or about Pilot Acoustic Systems
Post Subject: The MiniMe X-overPosted by Romy the Cat on: 12/31/2008
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 serenechaos wrote:
Did you use LEAP or anything like that, or just cross everything over 1st order as a guess, and tune by ear? 

Oh, no. I do not use any LEAPs or others tools, no time domain analyses or anything like this – there is truly no need for it. The MiniMe case is very simple, not to mention that I generally have attitude toward many questionable design and substitution methods if they were used with no need.

In MiniMe everything is very simple and the key is to determine the bandpass for the MF driver. No one prediction software in the world will tell you where to cross it – you need to hear it. The first order on MF driver is expected based upon the Macondo Axioms.

The tweeter is ribbon as any good ribbon it sounds a few Hz above better then a few Hz below; even though this particular tweeter has something that shell make him more midrange-capable. I still would like to do go with tweeter more then I need to in order to compliment the MF driver. The tweeter crossover is other story. I believe that a ribbon tweeter can’t have first order passive crossover. Even if we do a first order passive then the inductance in the transformer still make it to behave like second order. So, why bother and do not do a pure second order? In my case I used an external coil to work alone with the inductance in Primary to write a perfect 12dB per octave Bessel curve. I might move is up and down in crossover point but the second order Bessel will be there foe sure.

The woofer is tricky as they are in a way abnormal and I would like to use the Resonating Oops on them, if I might. Therefore I have no idea where to cross them. I have no idea how low my MF will be in the box that I have made… So we will see.  The connection of the woofers is a variable as well as I do not know how I will be driving it and if I need to have high impedance at LF. If the tail on LF will be too long then I might go for a subtraction crossover but I think what I sketched able is a good starting point.

As you see there is not room in there for LEAP modeling everything is arbitrarily but the actual sound.

The Cat

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