I am the original and only owner. As is the case with all of my stereo component offerings, this device has been stored in a climate controlled environment away from light, dust, smoke and moisture. I have not used the MP-3 in my music system for ten years but I tested it thoroughly on February 25, 2011 and it performs exactly as it should. I have detailed the MP-3 prior to offering it for sale. Cosmetically the item is in almost new condition.
This device allows you to switch between two audio sources and control the volume of up to four different pairs of speakers, even if your amplifier or receiver has connections for only one pair of speakers. More importantly, the MP-3 Speaker Control Center does this while keeping the impedance (resistance) above 3.5 ohms to all pairs of speakers while minimizing the insertion loss (reduction of maximum possible volume). What this means is that each pair of speakers will function properly with a wide volume range even if all the speakers are playing at once.
The MP-3 has no power cord, nor does it need one. It derives whatever power it needs from the speaker wires. Basically, you connect your receiver/amp to the MP-3 as if it was a pair of speakers, then you hook up all of your speaker pairs to the MP-3. The controls allow you to turn speakers on or off and control the volume of each pair.
This component is functionally the same item as the Russound SP-4, except that is not rack mountable. Instead it sits on four rubber feet. It is a rather small component, being only 9” wide x 8” deep x 3.25” high. It weighs less that four pounds.
Please note: this component was named MP-3 over 30 years ago and has absolutely nothing to do with the current MP3 digital audio encoding format. The name similarity is purely coincidental.
All included items will be carefully packed and well padded to minimize the risk of shipping damage.
Sorry, no international shipping. Please don’t ask me to ship to a destination outside the U.S. Please pay using PayPal within three days after the auction ends.
Remember to bid thoughtfully, as these items are being sold “AS-IS” and are not returnable.
Thank you for taking the time to read my listing.