Marantz NR1504. Marantz NR1504 ~ 5.1 AV Surround Receiver. M-DAX™ (Marantz Dynamic Audio eXpander) for better sound from MP3s and other digital music files. free Marantz remote app lets you use your iPod touch®, iPhone®, iPad®, or Android™ device as a Wi-Fi® remote.
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