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#1
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AC/DC Power Supply for a marine Stereo Unit
I've bought a marine CD/Stereo unit (Jensen MCD5112) to install in a
swimming pool building in Australia and am stumped as to how to choose the most economical 240 VAC/12 VDC power supply for it and would appreciate any advice. The unit is intended to be powered by a boat's 12 VDC system but I have 240 VAC available. I thought the stereo would be a good one for the moist environment in the pool house. ------------------------------- Specifications for the stereo a Amplifier-- Total System Power 200 W peak Power Output 4x50 W General-- Power Supply 11-16 VDC, negative ground Speaker Output Impedance 4-8 Ohms Fuse Fast Blow ATO (15 amp) ----------------------------------------- I planned to connect a pair of indoor/outdoor speakers and can choose between: 30 W rms, 8 Ohm or 25 W rms, 4 Ohm The 25 W pair have slightly better sensitivity and frequency specs and cost a little more. A label on the stereo unit states, "The amplifiers in this radio are only designed for use with 4 speakers." I don't know if this means it cannot be used with just two speakers, or that you cannot connect more than four. I was only planning to connect two. My questions a 1. How small of a power supply can I safely get by with? If I choose the choose the 25 watt speakers, and find a 80% efficiency, 150 W power supply would that be sufficient? 2. If the label does mean I need to connect four speakers, can I instead connect two and substitute appropriate size 4 Ohm resistors for the other two? Thanks. |
#2
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Someone finally says first where they are in the world, before asking for
help, well done. The 4 ohm speakers are the better choice. I can't see a reason why connecting just 2 speakers would be a problem, but then again I don't have the unit in front of me, just set the fader control for just front or just rear, depending which set you connect. As for power supply, the best would probably be an old AT / ATX computer power supply, you may have to load up the +5V rail to get it to work, but they supply +12V at around 8 amps, that's more than enough for this application and probably the cheapest way around needing an expensive dedicated supply. Paul |
#3
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Actually any company that does automotive radio repair or even retails the
product should be able to give you a lead to a nice, compact, +12VDC supply. Even from Radio Shack, however I do prefer the Computer Power Supply direction only because there are a plethora of them available on the cheap. Cheers and Have a Great Holiday, Enjoy your Summer Down Under Gov. "loedown" wrote in message ... Someone finally says first where they are in the world, before asking for help, well done. The 4 ohm speakers are the better choice. I can't see a reason why connecting just 2 speakers would be a problem, but then again I don't have the unit in front of me, just set the fader control for just front or just rear, depending which set you connect. As for power supply, the best would probably be an old AT / ATX computer power supply, you may have to load up the +5V rail to get it to work, but they supply +12V at around 8 amps, that's more than enough for this application and probably the cheapest way around needing an expensive dedicated supply. Paul |
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