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Re: My 3π adventure [message #95597 is a reply to message #95260] Sat, 07 May 2022 21:02 Go to previous messageGo to previous message
ppkstat is currently offline  ppkstat
Messages: 38
Registered: February 2022
Baron
Because there were some very slight imperfections from the paintjob I decided to do some measurements in order to see everything is ok with the waveguides. TL;DR everything is fine, or at least what worried me at first had nothing to do with the paintjob.

This is the measurement setup. It's a somewhat nearfield measurement to minimize room reflections as much as possible.

/forum/index.php?t=getfile&id=3059&private=0

This is the response. I tried both drivers and both waveguides but all the results are very similar to this.

/forum/index.php?t=getfile&id=3060&private=0

What initially worried me was that 2-headed spike in the 14k-18k region. Mainly due to the fact that in Wayne's measurements it wasn't there (the rest of it looks almost identical). It also appears to be flatter in the 800Hz-2kHz region but I guess that's good. This 2-headed spike appears to be a property of the drivers - it's there even without a waveguide attached and ironically something very similar can be seen in the response of the DE250 provided by the manufacturer.

This is the tweeter going through the crossover.

/forum/index.php?t=getfile&id=3061&private=0

And these are both responses plotted together and smoothed (var) in order to be more easily compared.

/forum/index.php?t=getfile&id=3062&private=0

By the way these babies HISS Shocked I was shocked to find that the DE250 when connected directly to my Hypex NC400 you can clearly hear them hissing and we're talking about an amplifier with a measured 105db SINAID Shocked It goes completely silent when it goes through the crossover. Just for fun I also tried it with my Monrio MC205 dual mono and it was a hissing festival. Coming from 85db speakers that go as low as 2.7Ω in the bass region this is a completely new world to me.

I am finishing up the plans, I will post an update here. I expect the cabinet construction to begin in the upcoming weeks.
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