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The drivers seem to be a variant of Monacor's SPH-175. They look slightly different
to the current SPH-175's, and measure even more differently. The tweeter is the Vifa D20TD-05-06.
The drivers are now over 7 years old, and this shows when I measure the T/S parameters
in the way of large inconsistencies between drivers.
I decided to pair them as best as I can and plough on regardless. I used my dedicated
DIY speaker measurement clamp to hold the drivers firmly
for impedance measurements, and used Speaker Workshop to do the measurements.
The T/S measurements were averaged out for the four midbass drivers and this was the result:
| Fs |
32.94 Hz |
Qes |
0.786 |
| Vas |
43.7 litres |
Qms |
9.739 |
| Re |
10.78 Ohms |
Qts |
0.728 |
| Le |
0.361 mH |
Sd* |
137 cm2 |
| L1 |
0.521 mH |
Xmax* |
2mm |
* Parameters taken from current SPH-175 spec sheet.
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