Mr. UPS just rang the door bell. These are the mid bass drivers Jeff B. used in his design seminar a few weeks ago. I would like to measure their T/S parameters, but they just came off the UPS truck and I swear they are -2 degrees F.
Visual inspection indicates extremely good construction and no shipping damage because they were well packaged. I'll follow up with some before and after break in T/S parameters. If the T/S parameters measure close to what was presented in the seminar thread I have a some what different box alignment in mind.
Edit: here are the measurements all taken on my 4' x 4' baffle:
First up, far field frequency response. Mic 20" from tip of dust cap. Gating 5 ms. 1/24th smoothing.

Second, distortion measurents. Same 20" mic distance, volume adjusted:

Here is the off axis measurements. Still at 20", same gating and smoothing. 0, 15, 30, and 45 deg:

Next up is frequency response near field (~0.25") volume adjusted:

Finally, here is the near field distortion measurement:

These were all taken in the last hour. Kid's playing and banging upstairs, furnace kicking on and off. Still I think they are valid measurement.
Visual inspection indicates extremely good construction and no shipping damage because they were well packaged. I'll follow up with some before and after break in T/S parameters. If the T/S parameters measure close to what was presented in the seminar thread I have a some what different box alignment in mind.
Edit: here are the measurements all taken on my 4' x 4' baffle:
First up, far field frequency response. Mic 20" from tip of dust cap. Gating 5 ms. 1/24th smoothing.

Second, distortion measurents. Same 20" mic distance, volume adjusted:

Here is the off axis measurements. Still at 20", same gating and smoothing. 0, 15, 30, and 45 deg:

Next up is frequency response near field (~0.25") volume adjusted:

Finally, here is the near field distortion measurement:

These were all taken in the last hour. Kid's playing and banging upstairs, furnace kicking on and off. Still I think they are valid measurement.
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