AudioTechnology FlexUnits 10C 77 25 10 KAP Measurements!
The last driver measurement to publish for the Sequence Three – Grand Reference loudspeaker design is the AudioTechnology 10C772510KAP 10” woofer. This woofer uses a very stiff rigid thick (2mm) sandwich cone. For its size it has an extended flat frequency response, with a cone break-up at approximately 1.9kHz.
Besides Troel Gravesens measurements, I haven’t seen any independent measurements made for this woofer. One thing that differs my measurements from Troels is that his cone break-up occurs higher up in frequency (2.5kHz), compared to my measurements.
In my case this is not an issue since I intend to cross-over the woofer to the mid-range somewhere between 3-400Hz. Even though the frequency response is very flat I doubt anyone would use this woofer any higher than 5-600Hz.
Next I will connect the Sequence Three – Grand Reference loudspeaker to my active DEQX HDP-3 system and start some listening and cross-over testing. 🙂
The woofer weighs about 8.5kg and is very robustly built. It has a large ventilation hole through the centre pole piece allowing for a compression free ventilation of the voice-coil. The ventilation hole is covered by foam.