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Amazon.com: beyerdynamic DT 770 PRO 32 Ohm Over-Ear Studio Headphones in Black. Enclosed Design, Wired for Professional Sound in The Studio and on Mobile Devices Such as Tablets and Smartphones : Musical
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Amazon.com: beyerdynamic DT 770 Pro 32 Ohm Studio Headphone, Grey (DT 770 Pro 32 Ohm Grey) : Musical Instruments
uxcell a14060700ux0217 4 Pcs 0.5W 32 Ohm 40mm Dia Round Metal Internal Magnet Mini Speaker (Pack of 4): Amazon.com: Industrial & Scientific
Amazon.com: PRV AUDIO 4 Inch Midrange Speaker 4MR60-4, 60 Watts Program Power, 4 Ohm, 30 Watts RMS Power Pro Audio Loudspeaker (Single) : Electronics
Amazon.com: uxcell 27mm Dia 32 Ohm 0.25W External Magnet Speaker Horn Loudspeaker Green : Electronics