@jr@mac said:
I'll share what I get, not a problem.
Just remember I take those plots as part of my method - they should not be confused with Zaph or HiFi Compass.
Not a problem. I appreciate Zaph's and HiFi Compass' measurements for what they are - standardized and repeatable. But I'll personally get more out of seeing measurements on a real baffle and seeing them implemented in a real design.
I had to take about 1/64" off of the edge of the port tubes to get it in there, and was still a little snug. If you opened it up to 5. 27 or so it would be perfect.
Set measurement level to 90db/1M on tweeter axis. Midrange is very impressive at these levels. It is also more sensitive than the ribbon. Ribbon measured with 20uF series cap.
Drivers raw on baffle:
Midrange has the signature dome mid response with the dipperino there. Nothing to lose sleep over. Tweeter is very flat on baffle. Woofer has a total shitshow of a breakup, and it was reflected in the impulse response:
Do you mind going back to the measurements and letting me know if this a correct interpretation...(ignoring the mid as you have covered that pretty clearly)
The tweeter distortion is okay above 2Khz and even better staying above 2.5Khz. The on-baffle, on-axis SPL curve looks quite good.
The woofer actually looks like it does pretty good from a distortion perspective, I assume the breakup you see in the impulse response is simply the jaggedness rather than a nice smooth curve? In a three way, even crossed higher to a dome midrange the breakup won't be a deal breaker, but if you wanted to use this in a 8" two-way you would need a robust tweeter to cross low...like 1.5khz LR4 or lower??
This midrange is pretty badass. Outclasses the tweeter, that's for sure. I was totally expecting rising distortion below 600Hz but it just isn't there. High sensitivity plus the ability to play lower than you'd think is a hit.
However, the response is not easy to work with so I had to hit it with that hammer of a XO.
Comments
I'll share what I get, not a problem.
Just remember I take those plots as part of my method - they should not be confused with Zaph or HiFi Compass.
Brad is the man!
Well.... HOT DAMN !
Shop life FTW!! 👍🏼
Obviously showing-off his CNC router programming skills . . .
Not a problem. I appreciate Zaph's and HiFi Compass' measurements for what they are - standardized and repeatable. But I'll personally get more out of seeing measurements on a real baffle and seeing them implemented in a real design.
Very nice! All the parts fit together the first time....what's that like?
BLISS!
I don't know, Brad's assembling for me.
They are home, and Mrs JR got a little listen to the big MTM.
Looking forward to hearing this project in Iowa. They look great.
I'm going to let the finish cure for a few days longer and install drivers later this week.
It fit!!!!
I had to take about 1/64" off of the edge of the port tubes to get it in there, and was still a little snug. If you opened it up to 5. 27 or so it would be perfect.
I will change it in your CNC file. I like to use some of these to go back as reference for sizes. Thank you.
Some measurements
Tweeter/Midrange/Woofer distortion
Set measurement level to 90db/1M on tweeter axis. Midrange is very impressive at these levels. It is also more sensitive than the ribbon. Ribbon measured with 20uF series cap.
Drivers raw on baffle:
Midrange has the signature dome mid response with the dipperino there. Nothing to lose sleep over. Tweeter is very flat on baffle. Woofer has a total shitshow of a breakup, and it was reflected in the impulse response:
Off to modeling.
The mid is definitely a Beast Mode level driver.
Wouldn't his combo of drivers be better suited to a 10" or larger woofer, JR?
I would work with either size. I'm not sure "better" is necessarily the best way to phrase that question.
Here are some preliminary models:
Have a pile of components on my desk and hope to wire things up tonight and start the process of tweaking.
Four coils missing in that picture, by the way.
Gonna be a bigun.
Not a typical JR crossover
No, it isn't but that mid deserves attention to detail.
Do you mind going back to the measurements and letting me know if this a correct interpretation...(ignoring the mid as you have covered that pretty clearly)
The tweeter distortion is okay above 2Khz and even better staying above 2.5Khz. The on-baffle, on-axis SPL curve looks quite good.
The woofer actually looks like it does pretty good from a distortion perspective, I assume the breakup you see in the impulse response is simply the jaggedness rather than a nice smooth curve? In a three way, even crossed higher to a dome midrange the breakup won't be a deal breaker, but if you wanted to use this in a 8" two-way you would need a robust tweeter to cross low...like 1.5khz LR4 or lower??
IMO, the tweeter HD is good above 4k. -40dB is 1%.
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On the distortion plots, is White 2nd or 3rd order?
Hi Tom, there is a legend in the bottom right corner of the graphs. Pretty sure D2 = 2nd order and is yellow while D3 = 3rd order and is grey.
Ah yes - I completely missed that!
This midrange is pretty badass. Outclasses the tweeter, that's for sure. I was totally expecting rising distortion below 600Hz but it just isn't there. High sensitivity plus the ability to play lower than you'd think is a hit.
However, the response is not easy to work with so I had to hit it with that hammer of a XO.
The crossover cost is worth it on this.