Have I measured well my drivers?
Right tweeter
2k3-2k6Hz 0.009-0.008 volts AC
2k7-5k7 0.008-0.007
5k8-6k9 0.007-0.006
7k-25k 0.006-0.006
Right woofer
50-102Hz 0.017-0.014 VAC
102.5-119 0.015-0.014
120-141 0.014-0.012
142-169 0.013-0.011
170-799 0.012-0.012
800-2k1 0.013-0.014
Left tweeter
2k3-2k5 0.010-0.010
2k6-3k7 0.009-0.009
3k8-4k8 0.008-0.008
4k9-7k3 0.007-0.006
7k4-25k 0.006-0.006
Left woofer
50-58Hz 0.0018-0.0024
59-60 0.025-0.028
60-63 0.029-0.035
64-67 0.035-0.040
68-72 0.041-0.036
73-76 0.037-0.030
77-80 0.031-0.024
81-87 0.025-0.020
88-89 0.021-0.018
90-124 0.019-0.015
125-131 0.016-0.014
132-158 0.015-0.013
159-1k2 0.012-0.011
1k3-1k7 0.011-0.012
1k7-3k1 0.012-0.013
3k2-4k4 0.013-0.013
I used the Elliot Sound Pages setup, attached pic.
I'm doing well the drivers measurements?
Where is the centre of the "flat" range, where the voltage does not change appreciably of each woofer?
Tweeter is Seas Millenium T25CF002 & woofer is SS 18W-8545-00, attached both data-sheets.
TIA
Right tweeter
2k3-2k6Hz 0.009-0.008 volts AC
2k7-5k7 0.008-0.007
5k8-6k9 0.007-0.006
7k-25k 0.006-0.006
Right woofer
50-102Hz 0.017-0.014 VAC
102.5-119 0.015-0.014
120-141 0.014-0.012
142-169 0.013-0.011
170-799 0.012-0.012
800-2k1 0.013-0.014
Left tweeter
2k3-2k5 0.010-0.010
2k6-3k7 0.009-0.009
3k8-4k8 0.008-0.008
4k9-7k3 0.007-0.006
7k4-25k 0.006-0.006
Left woofer
50-58Hz 0.0018-0.0024
59-60 0.025-0.028
60-63 0.029-0.035
64-67 0.035-0.040
68-72 0.041-0.036
73-76 0.037-0.030
77-80 0.031-0.024
81-87 0.025-0.020
88-89 0.021-0.018
90-124 0.019-0.015
125-131 0.016-0.014
132-158 0.015-0.013
159-1k2 0.012-0.011
1k3-1k7 0.011-0.012
1k7-3k1 0.012-0.013
3k2-4k4 0.013-0.013
I used the Elliot Sound Pages setup, attached pic.
I'm doing well the drivers measurements?
Where is the centre of the "flat" range, where the voltage does not change appreciably of each woofer?
Tweeter is Seas Millenium T25CF002 & woofer is SS 18W-8545-00, attached both data-sheets.
TIA
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You have voltages, now do the math to convert them into Ohms, and plot them on a log-log graph.
You will see you have not measured the tweeters at a low enough frequency to find its resonance peak. You don't have the resolution to see the woofers impedance peak.
I really suggest anyone getting serious to read Joe D'Apolitto's book "Measuring Loudspeakers"
Or, now you understand how to do it the hard way, very important before you move on so congratulations, download LIMP so it will do it in a push of the button. I use Woofer TEster II myself.
Once you have these impedance measurements, you then need to get the acoustic measurements. These can be plugged into something like PSD-Lite.
You will see you have not measured the tweeters at a low enough frequency to find its resonance peak. You don't have the resolution to see the woofers impedance peak.
I really suggest anyone getting serious to read Joe D'Apolitto's book "Measuring Loudspeakers"
Or, now you understand how to do it the hard way, very important before you move on so congratulations, download LIMP so it will do it in a push of the button. I use Woofer TEster II myself.
Once you have these impedance measurements, you then need to get the acoustic measurements. These can be plugged into something like PSD-Lite.
Read this: AudioBlog: A simple loudspeaker measurement jig for ARTA and build the very simple jig. It needs line level I/O, I use a low-cost Behringer UCA202.
Ralf
Ralf
Hi,
If one needs a free solution to measure the TSP,currently the best solution is REW (Room Eq Wizzard),
Same setup apply as LIMP/ARTA,it has little more features too. I've been using for several months and gives a wee bit better results then LIMP (which was my earlier SW)
Hope you are aware that the driver needs to burn-in for atleast 50hrs to give you proper data,so if you have already not done it,Please let the drivers run in with 25hz Sinewave for 10hrs or so at stretch and then measure it after every cycle.
Please try it and post the results.
Regards.
If one needs a free solution to measure the TSP,currently the best solution is REW (Room Eq Wizzard),
Same setup apply as LIMP/ARTA,it has little more features too. I've been using for several months and gives a wee bit better results then LIMP (which was my earlier SW)
Hope you are aware that the driver needs to burn-in for atleast 50hrs to give you proper data,so if you have already not done it,Please let the drivers run in with 25hz Sinewave for 10hrs or so at stretch and then measure it after every cycle.
Please try it and post the results.
Regards.
Don't need a bigger amp. The WooferTester does fine with very low power. I calibrate my setup with 10 Ohm .1% resistor. Consistency is what matters. Alligator clips are not consistent at very low voltages.
When I do the measurements for T/S parameters, I do both mass displacement and box volume until I get within a few percent. Then I know I did it correctly.
Have you read Measuring Loudpeakers by Joe D'Apolitto. It is THE reference on this.
When I do the measurements for T/S parameters, I do both mass displacement and box volume until I get within a few percent. Then I know I did it correctly.
Have you read Measuring Loudpeakers by Joe D'Apolitto. It is THE reference on this.
I guess now the measurements are OK, 1st pic SS18W854500 left, 2nd pic SS18W854500 right, 3rd pic Seas Millenium left & 4th pic Seas Millenium right.
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