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1" Horn Flares - educate me! |
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audiomik 
Old Croc 
Joined: 06 April 2010 Location: Bath, UK Status: Offline Points: 2962 |
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 Posted: 10 December 2012 at 6:21pm |
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Your 70º phase is likely to be related to the high impedance peak questioned by charden.
Certainly it is not an 'expected' result for a well designed passive two-way crossover input where the VI phase shifts tend to cancel each other for the low and high pass sections. Mik |
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Warning! May contain Nuts
plus springs, washers, screws, etc, etc. |
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stevie
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Joined: 16 March 2008 Location: Dorchester Status: Offline Points: 425 |
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Posted: 10 December 2012 at 6:26pm |
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I'm not worried about the frequency response - it's +/- 2dB, which is OK. It's the electrical phase that bothers me - the black dotted line in the impedance curve. I'm normally able to keep this within +/- 45 degrees, but there's so much equalization going on here, that I haven't been able to manage it.
It's the crossover producing the impedance peak. And yes, there's a zobel on the woofer (plus a third-order electrical filter and a parallel notch filter). |
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stevie
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Posted: 10 December 2012 at 6:34pm |
I could have another go at the crossover, but I'm wondering how important this peak in the electrical phase actually is in practice. Edited by stevie - 10 December 2012 at 6:38pm |
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ceharden
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Posted: 10 December 2012 at 6:50pm |
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Equalisation networks in passive crossovers will cause impedance variations and phase shifts, absolutely nothing you can do about that.
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truecolour
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Posted: 30 December 2012 at 9:48pm |
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the peaks at the 5kHz upwards range are just resonances in the horn - in the compression driver, throat and mouth. The grille will only produce small ripples if a couple of dB or less and would probably be at a higher frequency.
As for the electrical phase - with a horn loaded CD, i would be surprised if you could hear any kind of phase shift in the HF. The plots look fine. how does it sound? |
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audiomik wrote: