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![Frequency response in free air of the subwoofer 18sound model 18NLW4500... | Download Scientific Diagram Frequency response in free air of the subwoofer 18sound model 18NLW4500... | Download Scientific Diagram](https://www.researchgate.net/profile/Massimo-Garai/publication/335909973/figure/fig2/AS:804742229925889@1568876907382/Frequency-response-in-free-air-of-the-subwoofer-18sound-model-18NLW4500-used-in-the-test_Q640.jpg)