Sanyo M7900 series

The M-7900 was a small "mini" boombox from Sanyo. But unlike most minis, this one is fully featured, including 4 speakers, music search, and dual antennas. It also has nice blue-colored woofers and real cone tweeters (not cheap piezos). And there are slots on top that allow you to attach a pair of external microphones (Sanyo HM-790), but those are very rare and difficult to find.

It measures 420mm wide, 155mm tall, and 84mm deep. It takes 6 C-cell batteries. It has two Rohm BA534 amplifier chips. In a 9 volt, 4 ohm boombox like this, that means it will produce approximately 2.3 watts per channel at 10% distortion.

Available models included the M7900K (which has shortwave), the M7900LU (sold in Europe), and the MR-V8 (sold in Japan only). Most of them do not have a Line In setting on the Function knob. But you can still connect an MP3 player. There is a DIN input on the side that works very well. It is labeled "REC/PB". Just go on Ebay and buy a cable with a DIN jack on one end and a 3.5mm headphone jack on the other. Then connect it to your MP3 player, raise the player's output volume to max, and press Rec/Play/Pause on the Sanyo. Yes, this means that the tape motor will be running. If you don't want that to happen, you can use the Mic inputs instead. To use those inputs, you would need a special cable with 3.5mm jacks on both ends. Connect your MP3 device, put it on half volume, turn the Sanyo volume to zero, turn the Sanyo radio tuner on, and use the Sanyo Mic Mixing knob to adjust the volume.

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