I think it's the 3700 model. Everything works fine except there's no sound from the main mic, the sub mic or the TV (no background music, no voice amplification.) The volume levels are high enough, and it's not the TV.. the problem seems to be wiring in the main mic. I live in LA and can't even find a repair shop. No receipt to return it or use warranty. I already bought a replacement system (ET-18000) but may return it and pay restocking fee if I can get the Leadsinger to work again. Thanks!

Audio Players & Recorders - Magic - Star Karaoke Microphone