Here are measurements of the passive Dali Zensor 1 bookshelf speaker.
It retailed for ~US $189 / pair (1996 SEK) in Sweden 12 years ago.
Note: This is not the passive speaker that came with my powered Zensor 1 AX, measured here:
www.audiosciencereview.com
I don't know if there's any difference though.
Equipment/settings used:
Calibrated miniDSP UMIK-2
REW v5.30.5 (mac)
OPPO BDP-93 (playback source)
Denon AVR-4306 (pre-amp/HDMI)
Rotel RB-1590 (power amp)
Sweep: 0-48000Hz 512K 24-bit 96 kHz
Homemade speaker turntable, 1m distance
I measured at 5 deg increments, both horizontal and vertical (negative horizontal angles duplicated since the speaker is symmetrical).
Number of measurements: 113 (148 including the duplicates).
It's similar to Zensor 1 AX, but a bit more uneven. The small 8 kHz dip wasn't there with the powered version. The directivity is nearly identical (as expected).
The early reflections look quite good considering how inexpensive this speaker is. It's designed to be used off-axis.***
Horizontal directivity:
0-90 deg compared to measurements by John Atkinson (Stereophile):
www.stereophile.com
Vertical directivity:
0-45 deg compared to Stereophile:
www.stereophile.com
Near on-axis compared to Stereophile (both are 0-30 deg horizontal averages):
From the Stereophile review:
DALI Zensor 1, anechoic response on HF axis at 50", averaged across 30° horizontal window and corrected for microphone response, with nearfield responses of woofer (blue trace), port (red), and their complex sum (black), plotted below 350, 700, and 300Hz, respectively.
www.stereophile.com
Distortion, 76dB @ 1m (measured at 30cm):
Distortion, 86dB (measured at 30cm):
I didn't measure at higher SPL, since the port was already making quite a bit of noise at 86dB SPL.
*** From the user manual:
The speakers are designed to meet our wide dispersion principle, so they should NOT be angled towards the listening position, but be positioned parallel with the rear wall, see Figure 2. By parallel positioning, the distortion in the main listening area will be lowered and the room integration will be improved. The wide dispersion principle will ensure that sound is spread evenly within a large area in the listening room.
It retailed for ~US $189 / pair (1996 SEK) in Sweden 12 years ago.
Note: This is not the passive speaker that came with my powered Zensor 1 AX, measured here:

Dali Zensor 1 AX Spinorama measurement
This is my first spinorama measurement, using this excellent guide: https://www.audiosciencereview.com/forum/index.php?threads/how-to-make-quasi-anechoic-speaker-measurements-spinoramas-with-rew-and-vituixcad.21860/ Equipment/settings used: Calibrated UMIK-2 REW v5.30.5 / macOS 14.3.1 A...

I don't know if there's any difference though.
Equipment/settings used:
Calibrated miniDSP UMIK-2
REW v5.30.5 (mac)
OPPO BDP-93 (playback source)
Denon AVR-4306 (pre-amp/HDMI)
Rotel RB-1590 (power amp)
Sweep: 0-48000Hz 512K 24-bit 96 kHz
Homemade speaker turntable, 1m distance
I measured at 5 deg increments, both horizontal and vertical (negative horizontal angles duplicated since the speaker is symmetrical).
Number of measurements: 113 (148 including the duplicates).
It's similar to Zensor 1 AX, but a bit more uneven. The small 8 kHz dip wasn't there with the powered version. The directivity is nearly identical (as expected).
The early reflections look quite good considering how inexpensive this speaker is. It's designed to be used off-axis.***
Horizontal directivity:
0-90 deg compared to measurements by John Atkinson (Stereophile):
DALI Zensor 1 loudspeaker Measurements
Sidebar 3: Measurements I used DRA Labs' MLSSA system and a calibrated DPA 4006 microphone to measure the DALI Zensor 1's frequency response in the farfield; and an Earthworks QTC-40, with its small, ¼" capsule, for the nearfield responses. (The small capsule doesn't interfere with the airflow.)
Vertical directivity:
0-45 deg compared to Stereophile:
DALI Zensor 1 loudspeaker Measurements
Sidebar 3: Measurements I used DRA Labs' MLSSA system and a calibrated DPA 4006 microphone to measure the DALI Zensor 1's frequency response in the farfield; and an Earthworks QTC-40, with its small, ¼" capsule, for the nearfield responses. (The small capsule doesn't interfere with the airflow.)
Near on-axis compared to Stereophile (both are 0-30 deg horizontal averages):
From the Stereophile review:
DALI Zensor 1, anechoic response on HF axis at 50", averaged across 30° horizontal window and corrected for microphone response, with nearfield responses of woofer (blue trace), port (red), and their complex sum (black), plotted below 350, 700, and 300Hz, respectively.
DALI Zensor 1 loudspeaker Measurements
Sidebar 3: Measurements I used DRA Labs' MLSSA system and a calibrated DPA 4006 microphone to measure the DALI Zensor 1's frequency response in the farfield; and an Earthworks QTC-40, with its small, ¼" capsule, for the nearfield responses. (The small capsule doesn't interfere with the airflow.)
Distortion, 76dB @ 1m (measured at 30cm):
Distortion, 86dB (measured at 30cm):
I didn't measure at higher SPL, since the port was already making quite a bit of noise at 86dB SPL.
*** From the user manual:
The speakers are designed to meet our wide dispersion principle, so they should NOT be angled towards the listening position, but be positioned parallel with the rear wall, see Figure 2. By parallel positioning, the distortion in the main listening area will be lowered and the room integration will be improved. The wide dispersion principle will ensure that sound is spread evenly within a large area in the listening room.
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