Sound Blaster X4 - Hi-res 7.1 External USB DAC and Amp Sound Card with Super X-Fi® and SmartComms Kit for PC and Mac - Creative Labs (United States)
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Amazon.com: Personal Voice Amplifier with Headset Mic 16W Mini Sound Amplification Portable Speaker Wired Loud-Speaker Amp Booster Enhancer for Teachers, Tour Guides, Coaches, Meeting, Indoor/Outdoor Events, etc : Musical Instruments