Interlude
Measurements

Horizontal Response:

Woofer:

ZS_L16RN_angle_512
Zwischenspiel_angle_512

The approximated directivity index is shown in the right picture. The widening at 4KHz becomes nicely visible again.

The ripple below 2KHz is a leftover from the measurements of the woofer.

ZS_GPL_512

Tweeter:

ZS_NoFerro900_WG_angle_512

The picture on the left shows the combined and equalized response recorded at ear hight with the speaker standing on the floor. The cross-over point is at 1.8KHz using 4th order LR slopes. As can be seen the off axis behavior is very smooth and there is a nice directivity control. The little widening around 4KHz is caused by the combination of the tweeter and the waveguide and not a baffle influence.

Listening tests have just started with this response.

DI_Zwischenspiel_512

In order to properly see where the baffle-step kicks in, a ground plane measurement was taken (left picture) with the speaker upside down.

It was first tried to measure the elevated speaker upright but this way a better resolution at the low end could be achieved.

The 5KHz woofer resonance was already notched out.

ZS_GPL
ZS_L16RN_nearfield_no_eg_512

Last updated 27-Mar-2017

The woofer plays into the complete volume of the closed box. The unequalized response yields a Qt of 0.6x and a f-3dB of 53Hz.

Currently it is equalized to Qt = 0.5 and 40Hz.

Two of those woofers in my room make a real decent bass and nothing is missing. Only at higher levels more volume displacement wouldn’t hurt.