We have developed the flush-filled flat diaphragm speaker system using our original metal cone technology. The purpose of the system is to get flat frequency response and to realize this, we also have made a new approach for better mechanical, electrical and acoustic performance. The actually measured frequency response is that from 22 Hz to 20 kHz, within +/-1.5dB when this 270 litre system is mounted in the ground to get an infinite baffle effect.
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