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Hey all, I have been measuring a couple of SS 26W/8867T00 drivers I purchased a while back with mixed results. I initially did a quick check before break-in with Soundeasy, I saw Fs and Qts were off so I proceeded with the break-in. I now have 36hrs on them driven close to xmax at ~18hz. The t/s parameters are still quite a bit different than expected.
I started looking into what drive levels to use and I read in general keep the signal as low as possible that provides reliable data. I have also read where Seas uses 2V for Fs.
What typical drive levels do most people use? On reason I ask is that the higher drive level I use the closer to the manufactures spec sheet I get.
From the SS data sheet the t/s parameters are;
Re=5.8 ohms
Fs=19Hz
Qms=4.5
Qes=0.31
Qts=0.29
Vas=179l
Mms=57gm
Bl=11.2Tm
at 135mv, 2V, 4.5V I get respectively,
Re=5.8, 5.8, 5.8 ohms
Fs=23.4, 21.7, 19.7Hz
Qms=7.78, 4.94, 3.51
Qes=0.53, 0.48, 0.44
Qts=0.50, 0.44, 0.39
Vas=127, 134, 159l
Mms=52, 58, 59gm
Bl=9.12, 9.76, 9.79Tm
Any info is appreciated.
-Scott
I started looking into what drive levels to use and I read in general keep the signal as low as possible that provides reliable data. I have also read where Seas uses 2V for Fs.
What typical drive levels do most people use? On reason I ask is that the higher drive level I use the closer to the manufactures spec sheet I get.
From the SS data sheet the t/s parameters are;
Re=5.8 ohms
Fs=19Hz
Qms=4.5
Qes=0.31
Qts=0.29
Vas=179l
Mms=57gm
Bl=11.2Tm
at 135mv, 2V, 4.5V I get respectively,
Re=5.8, 5.8, 5.8 ohms
Fs=23.4, 21.7, 19.7Hz
Qms=7.78, 4.94, 3.51
Qes=0.53, 0.48, 0.44
Qts=0.50, 0.44, 0.39
Vas=127, 134, 159l
Mms=52, 58, 59gm
Bl=9.12, 9.76, 9.79Tm
Any info is appreciated.
-Scott