Yamaha NS-SP1800BL Review

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The NS-SP1800BL features advanced Yamaha active servo technology (Advanced YST) is a unique system in which the speaker and amplifier...
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Summary
The NS-SP1800BL features advanced Yamaha active servo technology (Advanced YST) is a unique system in which the speaker and amplifier work together to cancel out impedance so the speaker unit has a perfectly linear motion. Advanced YST helps to ensure the highest levels of sound pressure and overall performance.
