babadono Posted December 18, 2019 Share Posted December 18, 2019 Just now, Emile said: trying a glass of wine for assistance careful too much wine can complicate things. 1 2 Quote Link to comment Share on other sites More sharing options...
Emile Posted December 18, 2019 Author Share Posted December 18, 2019 4 minutes ago, babadono said: careful too much wine can complicate things. OK; plugged RCA to XLR cable back into the K1 ... hum is back So it seems it is "just" this connector cable??? Quote Link to comment Share on other sites More sharing options...
Emile Posted December 18, 2019 Author Share Posted December 18, 2019 Used RCA to XLR cables from Monoprice ... no clue why both of them went "bad" ... one I can understand, but both??? ... https://www.monoprice.com/product?p_id=4775&gclid=EAIaIQobChMI-dfLgoO-5gIVjIbACh2ERQSQEAQYAiABEgJjkfD_BwE Add-on ... hum in both channels, but one side is "louder" Quote Link to comment Share on other sites More sharing options...
Khornukopia Posted December 18, 2019 Share Posted December 18, 2019 2 hours ago, Emile said: one of my 1/4 plugs broke in the K1 ... tip only and does not affect sound . You have already retrieved this broken tip from inside the power amp, correct, and you removed it while the unit was disconnected from the 120V power? 1 1 Quote Link to comment Share on other sites More sharing options...
Emile Posted December 18, 2019 Author Share Posted December 18, 2019 3 minutes ago, Khornukopia said: You have already retrieved this broken tip from inside the power amp Hi Khornukopia ... thanks for your help No; tip (1/4 inch??) is still stuck inside, but does not seems to affect anything. (Tried "drill" method and "glue on a stick" but no luck.) Seems it never affected anything ... and if it did, should be only ONE channel ??? Has worked fine with the RCA to XLR connectors for about a year 1 Quote Link to comment Share on other sites More sharing options...
Khornukopia Posted December 18, 2019 Share Posted December 18, 2019 The tip could be harmless where it sits, but I would want to remove the foreign object so that it can not cause a mysterious hum problem in the future. Should be easy to grab with some needle nose pliers, after unplugging the unit from the wall and removing the top cover and following normal electrical safety procedures. 1 1 Quote Link to comment Share on other sites More sharing options...
Emile Posted December 18, 2019 Author Share Posted December 18, 2019 5 minutes ago, Khornukopia said: I would want to remove the foreign object Haha ... will try again, but from memory, the "female" part of this is fully enclosed ... no way to get to the tip 1 Quote Link to comment Share on other sites More sharing options...
Emile Posted December 18, 2019 Author Share Posted December 18, 2019 Found an interesting review on these Monoprice RCA to XLR cables ... Quote XLR pin 2 (low) and the cable shield (XLR pin 3) are connected together at the RCA end, a potential source of ground-loop issues (in other words, hum). From my research, the best way to wire these kinds of adaptor cables to avoid hum is inot/i tying the cable shield and the low conductor together at the RCA end, instead wiring XLR pin 3 to RCA shield and insulating the cable shield at the RCA end. Short of modifying the cables (which, needless to say, is strictly at your own risk and will void warranties), buying a few cables and testing them first to ensure they will perform noiselessly in your application before committing to a larger quantity is highly recommended. Unquote Not sure how to "improve" these cables ... but it sure sounds like "my problem." Any better RCA to XLR cables? 1 Quote Link to comment Share on other sites More sharing options...
billybob Posted December 18, 2019 Share Posted December 18, 2019 6 minutes ago, Emile said: Haha ... will try again, but from memory, the "female" part of this is fully enclosed ... no way to get to the tip Do you know what this tip is? 1 Quote Link to comment Share on other sites More sharing options...
Emile Posted December 18, 2019 Author Share Posted December 18, 2019 3 minutes ago, billybob said: Do you know what this tip is? Just the top end of a 1/4" connector ... see pic ... only the top part is "stuck." 1 Quote Link to comment Share on other sites More sharing options...
OO1 Posted December 18, 2019 Share Posted December 18, 2019 - 1 Quote Link to comment Share on other sites More sharing options...
Emile Posted December 18, 2019 Author Share Posted December 18, 2019 @Randyh... thanks ... will try again 1 Quote Link to comment Share on other sites More sharing options...
OO1 Posted December 18, 2019 Share Posted December 18, 2019 - 1 Quote Link to comment Share on other sites More sharing options...
OO1 Posted December 18, 2019 Share Posted December 18, 2019 - 1 Quote Link to comment Share on other sites More sharing options...
Emile Posted December 18, 2019 Author Share Posted December 18, 2019 5 minutes ago, Randyh said: can you take a picture Will do when I take it apart ... tomorrow 1 Quote Link to comment Share on other sites More sharing options...
OO1 Posted December 18, 2019 Share Posted December 18, 2019 - 1 Quote Link to comment Share on other sites More sharing options...
OO1 Posted December 18, 2019 Share Posted December 18, 2019 - 1 1 Quote Link to comment Share on other sites More sharing options...
babadono Posted December 18, 2019 Share Posted December 18, 2019 47 minutes ago, Emile said: Found an interesting review on these Monoprice RCA to XLR cables ... Quote XLR pin 2 (low) and the cable shield (XLR pin 3) are connected together at the RCA end, a potential source of ground-loop issues (in other words, hum). From my research, the best way to wire these kinds of adaptor cables to avoid hum is inot/i tying the cable shield and the low conductor together at the RCA end, instead wiring XLR pin 3 to RCA shield and insulating the cable shield at the RCA end. Short of modifying the cables (which, needless to say, is strictly at your own risk and will void warranties), buying a few cables and testing them first to ensure they will perform noiselessly in your application before committing to a larger quantity is highly recommended. Unquote Not sure how to "improve" these cables ... but it sure sounds like "my problem." Any better RCA to XLR cables? Non sense. IF this persons cable was wired from Monoprice like this it was a defective cable. All my Monoprice RCA to XLR cables are wired correctly. Pin 2 of the XLR is connected to the RCA center pin down the clear or milky wire of the twisted pair. Pin 3 goes down the black wire of the twisted pair and connects to the RCA outer contact. Pin 1 of the XLR goes to the shield drain wire and is connected ONLY to the black wire ONLY at the RCA outer contact. This is the proper way to wire an RCA output to an XLR input. I concur with others get that broken tip of the RCA to 1/4" adapter outta there. Was that a Monoprice jewel too. I've had one of their adapters come apart at that joint also. I would connect the RCA to XLR cables back up to the amp after you get that tip out. Then at the RCA end short the tip to the outer contact. This will tell you if your cables are the culprit. 1 Quote Link to comment Share on other sites More sharing options...
babadono Posted December 18, 2019 Share Posted December 18, 2019 Emile BTW do you have a meter? 1 Quote Link to comment Share on other sites More sharing options...
babadono Posted December 18, 2019 Share Posted December 18, 2019 2 hours ago, Emile said: Used RCA to XLR cables from Monoprice ... no clue why both of them went "bad" ... one I can understand, but both??? .. Yes, not bloody likely. 1 Quote Link to comment Share on other sites More sharing options...
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