bleonhartearthlink.net Posted February 18, 2001 Share Posted February 18, 2001 I made a speaker selector switch with two heavey duty DP/DT switches. It has worked fine for a year or so but recently blew one side of my power amp. I have a Hafler P4000 (375w per side i think) going to the two DP/DT switches then splitting of to ns10s and krks both 8 ohms. Now is there somthing im overlooking? The switches are not carring any load since they are alays going to a speaker right?.....does everybody how has multiple speakers spend a few hundred $ on a real selector box? Thank you, Bruce Link to comment Share on other sites More sharing options...
Ethan Winer Posted February 18, 2001 Share Posted February 18, 2001 Bruce, > The switches are not carring any load since they are alays going to a speaker right? < No, a switch DOES carry a load, since the current that flows from the amp to the speaker also passes through the switch. I suggest a switch that can handle 15 amps. These are not hard to find, and they're not much more expensive than switches that can handle less current. --Ethan The acoustic treatment experts Ethan's Audio Expert Book Link to comment Share on other sites More sharing options...
BPSHOUAOL.COM Posted February 19, 2001 Share Posted February 19, 2001 Most switches have voltage/amp ratings.for example 120volts/15amps etc. Generally,the higher the volts the lower the amps and verse visa. I need to build a speaker selector switch and was thinking rotary or toggle switch and does anybody have a diagrahm?I have 3 types of monitors 100 watts per side and 2 different power amps WHOA!sORRY IM JUST ADDING TO THE PROBLEM,NOT RESOLVING YOURS.... Link to comment Share on other sites More sharing options...
breakwaybellatlantic.net Posted February 20, 2001 Share Posted February 20, 2001 Bruce, I think that the reason you blew the amp is that, unless you use a switch with a "center-off" position, both sets are momentarily connected while you switch (a few milliseconds) If you had the amp cranked while you switched repeatedly, it causes the contacts to flash over (become elongated) making the "momentary-both-sets" condition worse. A heavy 10 or 15 amp @ 120 volt switch with a center-off position (DON'T LEAVE THERE) should solve things. I checked mcmelectronics.com, and they have a four pair selector with push buttons, part 50-2075, for $105.00. Good Luck! Link to comment Share on other sites More sharing options...
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