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Multi-Way Conventional loudspeakers with crossovers

Hatt SE MK1
Hatt SE MK1
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Old 2nd January 2018, 01:50 PM   #1
bcrazy is offline bcrazy  Norway
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Default Hatt SE MK1

I want to build this:

http://www.humblehomemadehifi.com/do...-SE%20Mk-I.pdf

But with a different tweeter (Seas 25TAFN/QG-TB2, similar to seas 27TAFNC/D)

But first i will try to simulate the original Hatt SE MK1 with the H883 tweeter.

I cannot get the simulation to make sence. When reversing tweeter polarity i do not get a big dip at the crossover frequency. Am i doing something wrong?
Attached Images
File Type: jpg Hatt SE mk1 filter.jpg (367.3 KB, 161 views)
File Type: jpg Hatt SE mk1 filter plot.jpg (437.7 KB, 159 views)
File Type: jpg Hatt SE mk1 filter plot reversed tweeter.jpg (437.3 KB, 158 views)
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Old 2nd January 2018, 02:53 PM   #2
Lojzek is offline Lojzek  Croatia
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Could you attach zipped zma's and frd's, baffle measures so that I can check within another simulator?
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Old 2nd January 2018, 03:08 PM   #3
bcrazy is offline bcrazy  Norway
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This are the file i use. I do not have measurements with the baffle.
It is taken from the published data from seas
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File Type: zip Seas27tafnc_d.zip (8.9 KB, 3 views)
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Old 2nd January 2018, 03:12 PM   #4
picowallspeaker is offline picowallspeaker  Italy
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Another one with another tweeter ( Tang Band )
Hatt TBS Progetto | sasaBlog
(scroll down the title to see the various chapters )
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Old 2nd January 2018, 04:04 PM   #5
Lojzek is offline Lojzek  Croatia
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Hey bcrazy, you have zero values for all the phase angle data. First have it calculated with Response Modeler, an Excel spreadsheet, then try again. Have you got the files of midwoofer also?
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Old 2nd January 2018, 09:14 PM   #6
bcrazy is offline bcrazy  Norway
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Is this better?
Attached Images
File Type: jpg Hatt SE mk1 phase.jpg (317.7 KB, 109 views)
File Type: jpg Hatt SE mk1 filter plot.jpg (432.0 KB, 106 views)
Attached Files
File Type: zip SeasW12CY001.zip (7.6 KB, 2 views)
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Old 3rd January 2018, 08:59 AM   #7
Lojzek is offline Lojzek  Croatia
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It looks better, now the summation curve is 5 dB above XO point and before it was 3.
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Old 3rd January 2018, 09:18 AM   #8
bcrazy is offline bcrazy  Norway
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Does a crossover design necessarily have to have a massive dip at crossover frequency with reversed polarity?

I do not really understand the effect of phase.
Why does it matter if the frequenzy response curve is flat?

Is it any difference with series vs parallell crossovers in this case?
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Old 7th January 2018, 04:54 PM   #9
bcrazy is offline bcrazy  Norway
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Ok I'll try and help myself

I have now measuered both the woofer and the tweeter (in a baffle with dimensions as Box). Modified the original filter and it now looks like this. I can not get the small bump at 1000 hz any flatter.

What do you guys think?
Dotted curve is with reversed tweeter polarity
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