I have made frequency measurements for the “Excellence Two – Mini Monitor” this weekend and the measurements look good. Both the mid-woofers and the tweeters measures as expected and each sample are a close match to each other and the build consistency seems to be very good.
The mid-woofer has cone break-ups at 10kHz and 13.5kHz. These break-ups are visible in the distortion measurements and have to be eliminated in the cross-over design with a notch filter centered at the stronger 10kHz break-up. They have a very smooth mid-range frequency response up to 2kHz where it starts to roll-off and does so without any visible cone-edge resonances. A 3-4dB BSC (Baffle Step Compensation) seems to be a good starting point to test with these mid-woofers.
The tweeter has a nice smooth frequency response with a slightly rising top-end response at the on-axis measurement. The baffle diffraction is noticeable at 3.5kHz as a mild dip in the frequency response. This dip flattens out as the off-axis angle increase and is gone at a 30 degree angle.
Now I have all the data to begin the cross-over simulation. 🙂
Sample 1 = Blue
Sample 2 = Red
For details see:
Driver Unit Measurements – Dayton Audio RS28F-4
Driver Unit Measurements – SEAS E0021 W12CY001