COVID
Apologies to you guys. My wife just tested positive for COVID and I have been back and forth to the hospital so right now it obviously priority. Thank you to all. BTW I just wanted to say I am re-reading Vance Dicksons Cookbook and much of what has been told to me is starting to make sense. I hope to resume the hobby soon as my wife recovers.
Apologies to you guys. My wife just tested positive for COVID and I have been back and forth to the hospital so right now it obviously priority. Thank you to all. BTW I just wanted to say I am re-reading Vance Dicksons Cookbook and much of what has been told to me is starting to make sense. I hope to resume the hobby soon as my wife recovers.
Thanks all. Wife is home they gave her the cocktail and she is resting now. Im trying to stay away from her (more than usual lol 🙂 ) so I am in my man cave doing off axis measurements. Struggling a bit as the SPL levels are widely different when adding curves. So basically I am doing it this way:
Mic 1 meter from speaker baffle
Mic located 1/2 way between 2 woofers
Speaker rotates Mic stationary
readings at 0, 20, 40, 60 (I know this is atypical)
Sine sweep gated at 7ms
If you see anything wrong with this please advise. once this is complete I will move on to vertical
Mic 1 meter from speaker baffle
Mic located 1/2 way between 2 woofers
Speaker rotates Mic stationary
readings at 0, 20, 40, 60 (I know this is atypical)
Sine sweep gated at 7ms
If you see anything wrong with this please advise. once this is complete I will move on to vertical
BTW smoothing is set to 1/24.
here is horizontal and vertical (from 0 to plus 60 degrees) I will post 0 to minus 60 as well later.
Just want to say I have never seen that drop in the middle like I am measuring it today. Embarrassing. I have some sweeps that show really flat response lol
here is horizontal and vertical (from 0 to plus 60 degrees) I will post 0 to minus 60 as well later.
Just want to say I have never seen that drop in the middle like I am measuring it today. Embarrassing. I have some sweeps that show really flat response lol
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Hope you wife recovers quickly.
The graph is nothing to be embarrassed about. When two drivers are separated vertically (as they almost always are) there will be a dip vertically off axis that will get deeper the further off axis you measure.
I'm not an expert by any means but don't you want to be measuring along the listening axis, the tweeter typically?
All the best to your wife and you, may she make a quick and complete recovery.
Moving the listening point to halfway between the speakers and tilting the tweeter lobe to compensate is a valid way of fixing the situation without a new baffle, but as you've found the crossover will take some work. The lack of energy in the 1-2 range can be fixed by altering the baffle step.
Following that, the tweeter can be rejigged to provide a flat response, but it will work quite a bit harder and you'll anyway get a drop at the top because you're so far off-axis.
Regardless of what you choose to do, a whole new crossover is mandatory.
Moving the listening point to halfway between the speakers and tilting the tweeter lobe to compensate is a valid way of fixing the situation without a new baffle, but as you've found the crossover will take some work. The lack of energy in the 1-2 range can be fixed by altering the baffle step.
Following that, the tweeter can be rejigged to provide a flat response, but it will work quite a bit harder and you'll anyway get a drop at the top because you're so far off-axis.
Regardless of what you choose to do, a whole new crossover is mandatory.
yea the cap on the 2nd woofer is way too big. I also have to go 2.5 way. That will be my next step then remeasure. (BTW I did a Sim and the Sim is improved)
When I post OmniMic plots, I find it helpful to use the PrtScr button to make a screen shot of the full screen OmniMic application, then paste it into a graphics software such as "paint" or "powerpoint" or any of a dozen others... then make a *.png or *.jpg file. The way you do it now, your plots are too small and have too little resolution.
If you are trying to match OmniMic measurements with simulations, it is best to convert the Omnimic measurements of the individual drivers to minimum phase. Within Xsim or VituixCad, change the y-dimension on the woofers to reflect the longer distance to your ear... 50 mm is a good guess to start with, but there are ways to calculate the offset distance from measured data... When you are ready for that we can point you to various posts which describe the method.
I have had good success in having simulations (using measured driver data) match the overall measured system response. I have done this with both OmniMic and with a 2 channel soundcard with conventional microphone... but the measurement and simulation techniques are slightly different.
Best of luck with your project. I hope your wife's recovery is fast and without complication.
If you are trying to match OmniMic measurements with simulations, it is best to convert the Omnimic measurements of the individual drivers to minimum phase. Within Xsim or VituixCad, change the y-dimension on the woofers to reflect the longer distance to your ear... 50 mm is a good guess to start with, but there are ways to calculate the offset distance from measured data... When you are ready for that we can point you to various posts which describe the method.
I have had good success in having simulations (using measured driver data) match the overall measured system response. I have done this with both OmniMic and with a 2 channel soundcard with conventional microphone... but the measurement and simulation techniques are slightly different.
Best of luck with your project. I hope your wife's recovery is fast and without complication.
ha ha thanks, I noticed that. I made the traces bold so I can see them. I thought it was because I was old 🙂
Hi all, well that was rough. My wife and I had COVID. We were both vaccinated and the first few days was rough but then it got better but slow recovery.
Since I last posted a couple of things. I just got a set of CJ Premier 12 monoblocks. The tube amps seemed to have tamed the glare I was hearing in the high midrange area. So looking back at what I needed to do there were 2 major changes.
1) Change the value of the cap on the low pass for the MW16P from 18uf to 6.8uf.
2) Change XO config to 2.5 way by adding a low pass on the woofer at 350hz.
I made change #1 and it sounds better already and next up is #2.
Since I last posted a couple of things. I just got a set of CJ Premier 12 monoblocks. The tube amps seemed to have tamed the glare I was hearing in the high midrange area. So looking back at what I needed to do there were 2 major changes.
1) Change the value of the cap on the low pass for the MW16P from 18uf to 6.8uf.
2) Change XO config to 2.5 way by adding a low pass on the woofer at 350hz.
I made change #1 and it sounds better already and next up is #2.