Hope you are speaking of just a holliday and not a long break Jazagaja...
I have the JMLC350 playing now with a Radian 951 Be driver. With this horn/driver combo anything below 800Hz is not recommended.
Hard to tell Jacek, I have to do some more distortion and time domain measurement in order to conclude. No question that the high mid / tweeter performance is good. The in-room sweet spot measurements looks very promising... the horns are pointing some 10degrees off sweet spot axis.
After 2 days of testing with Audiolense I have landed on a cross over frequency of 1kHz, which is higher than I hoped for (15" FaitalPro FX560 in BR cabinet). Later I will do some testing of the horn with cardioid midbasses.
After 2 days of testing with Audiolense I have landed on a cross over frequency of 1kHz, which is higher than I hoped for (15" FaitalPro FX560 in BR cabinet). Later I will do some testing of the horn with cardioid midbasses.
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Universe Art Edition for Hi-End Munich 2012, sorry for bad quality photo, more to come. Yellow strokes are very expensive dental resins.
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A few screenshot and pictures of the current status:
- PIC motor en encoder control board finished
- rotary table finished
- positioning works very accurate and fast (PID controlled)
- "scope" function for position routine works also (used to fine tune PID parameters)
What's left:
- program shortcut key's to make it easier to control it from Auto-It script
- adapt Auto-it screen to work with new software and ARTA
- do some code clean-up
- writing some documentation
- testing testing testing...
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Same here - nice job. Would you sell me one? What kinds of loads will it take? That usually ends up being the problem.
One suggestion. I do not test at equal intervals, its better to have more forward resolution than aft. But typing in the numbers would also be a pain. Could a numerical table be setup where one just clicks a button and it goes to the next value in the table? That coupled with HolmImpulse would be exceptional.
I may even make my polar mapping program available and for the first time in history we could all be looking at very high resolution and accurate polar data that is done the same way and hence comparable.
One suggestion. I do not test at equal intervals, its better to have more forward resolution than aft. But typing in the numbers would also be a pain. Could a numerical table be setup where one just clicks a button and it goes to the next value in the table? That coupled with HolmImpulse would be exceptional.
I may even make my polar mapping program available and for the first time in history we could all be looking at very high resolution and accurate polar data that is done the same way and hence comparable.
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Thanks!
I will make all source code open source, and executables will also be posted. The pcb is very simple (see circuit attached). The only "difficult" thing for DIYers will be programming the PIC and finding a suitable motor cheaply.
I found a PITMANN motor on Ebay with a reduction of 63 and a 256 inc encoder for 30 €. Maxon motors with quadrature encoder show also up every now and then. For bearing I used one of these: Drehkranz Drehlager Drehteller Drehscheibe Ø 330 mm | eBay
remark: I have no affiliation with this seller. I just posted this because it’s ideal to make an automated rotary table.
This should allow many people there to build an automated rotary table.
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To avoid going to much of topic, I will create a new thread in the section "Equipment & Tools "
Please post any questions there, then all information will be grouped.
See http://www.diyaudio.com/forums/equi...automatic-polar-measurements.html#post2981684
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Measured t/s:
Fs = 31 Hz
Re = 6.2 ohms[dc]
Le = 0.87 mH
Qt = 0.36
Qes = 0.37
Qms = 11.11
Mms = 80.5 grams
Rms = 1.4 kg/s
Cms = 334 um/N
Vas = 132 liters
Sd= 530 cm^2
Bl = 16.2 Tm
ETA = 0.99 %
Lp(2.83V/1m) = 93.2 dB
Added Mass Method:
Added mass = 32.00 grams
Diameter= 26.00 cm
Fs = 31 Hz
Re = 6.2 ohms[dc]
Le = 0.87 mH
Qt = 0.36
Qes = 0.37
Qms = 11.11
Mms = 80.5 grams
Rms = 1.4 kg/s
Cms = 334 um/N
Vas = 132 liters
Sd= 530 cm^2
Bl = 16.2 Tm
ETA = 0.99 %
Lp(2.83V/1m) = 93.2 dB
Added Mass Method:
Added mass = 32.00 grams
Diameter= 26.00 cm
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This translates to 5Hz lower -3dB point against 12BR70. I will be making another Mummy (Ferrari Red) with 12BR100 and DE500 and compare with BMS 4524+12BR70.
I am looking forward to this, these are the drives I want to try myself in these enclosure.
Can you show measurements with the driver in a baffle raised clear of the carpet ... including off-axis behaviour?? 🙂. Also impedance and time domain measurements is interesting to see!
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