Poly - Plantronics .Audio 750 DSP alternatives, similar headphones

A4tech HS-50
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Poly - Plantronics .Audio 625 USB
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Poly - Plantronics .Audio 645 USB
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Poly - Plantronics .Audio 650 USB
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Poly - Plantronics .Audio 470 USB
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Poly - Plantronics .Audio DSP-400
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Poly - Plantronics .Audio 770
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Poly - Plantronics .Audio 480 USB
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Poly - Plantronics SupraPlus Wireless CS361N Spare Headset
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Poly - Plantronics SupraPlus DIGITAL D251
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Poly - Plantronics SupraPlus DIGITAL D251N
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Poly - Plantronics SupraPlus DIGITAL D261
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Poly - Plantronics SupraPlus DIGITAL D261N
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