I have measured the loudspeaker with my DEQX pre-amp equipment and made various cross-over configurations in order to get a sense of how the drivers behave and integrates with each other.
I use the DEQX in a quick setup to break-in drivers and so far I’ve played about 10 hours of music through them and the result is really promising 🙂
I’ve tried the following cross-over frequencies:
- 1500Hz 48db/octave phase-linear filters.
- 1750Hz 48db/octave phase-linear filters.
- 2000Hz 48db/octave phase-linear filters.
- 2250Hz 48db/octave phase-linear filters.
A low cross-over point is clearly the way to go with these drivers. Right now I favor the 1750Hz cross-over point, but this might probably change after I’ve done frequency and distortion measurements and starting to simulate the passive cross-over.
The picture shows the 2m tweeter-axis 15deg measurement I’ve used for the quick DEQX cross-over. The measurement is valid from 400Hz. Notice the very mild effect of the baffle diffraction at the 15deg off-axis measurement.
The mid-woofers have a nice even frequency response and the expected 10kHz cone break-up is clearly visible. The two mid-woofers are a close match of each other.
The tweeters have a nice even frequency response and the sample 2 has a slightly higher sensitivity and a rising top-end response compared to sample 1. In the cross-over region they are a close match and the overall difference is small and isn’t noticeable in listening tests.