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Question: Behringer "cancellation" in stereo
I have a Behringer UB2442FX-Pro mixer. When I input a stereo CD, cassette, VCR
audio, whatever, into stereo inputs 9/10, 11/12, 13/14 or 15/16, It cancels out. Whassup? If I unplug either left or right input, it is OK, just 1/2 of the stereo, but I can't keep both channels plugged in at the same time. I thought that one of the left or right cables might be wired OOP, so I checked, switched, finally made NEW cables paying careful attention to polarity (RCA to 1/4"). The problem persists, on all 4 stereo inputs! Could Behringer have wired it wrong? Out of phase? Or could they have inadvertently wired the lower (right) input of these pairs as an insert jack, as is the norm on the 1-8 mono channels? |
#2
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Blackburst wrote:
I have a Behringer UB2442FX-Pro mixer. When I input a stereo CD, cassette, VCR audio, whatever, into stereo inputs 9/10, 11/12, 13/14 or 15/16, It cancels out. Whassup? If I unplug either left or right input, it is OK, just 1/2 of the stereo, but I can't keep both channels plugged in at the same time. I thought that one of the left or right cables might be wired OOP, so I checked, switched, finally made NEW cables paying careful attention to polarity (RCA to 1/4"). The problem persists, on all 4 stereo inputs! Could Behringer have wired it wrong? Out of phase? Or could they have inadvertently wired the lower (right) input of these pairs as an insert jack, as is the norm on the 1-8 mono channels? Maybe it did get wired wrong, but given the amount of automation in the assemply of those things, that could suggest a whole lot of 'em are wired that way. Hit up Beri's tech support; I've found it outstanding. They will take care of it. -- ha |
#3
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"Blackburst" wrote in message ... I have a Behringer UB2442FX-Pro mixer. When I input a stereo CD, cassette, VCR audio, whatever, into stereo inputs 9/10, 11/12, 13/14 or 15/16, It cancels out. Whassup? Even if it were wired with reversed polarity, you would still hear something when playing a stereo CD through it. And, I'm assuming you are not mixing the two stereo channels together to mono, right??? Do you hear aboslutely nothing when you do this? Mike Putrino |
#4
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"Blackburst" wrote in message... I thought that one of the left or right cables might be wired OOP, so I checked, switched, finally made NEW cables paying careful attention to polarity (RCA to 1/4"). The problem persists, on all 4 stereo inputs! Intentionally wire one cable out of phase and try again... report back. DM |
#6
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"Blackburst" wrote in message ... I have a Behringer UB2442FX-Pro mixer. When I input a stereo CD, cassette, VCR audio, whatever, into stereo inputs 9/10, 11/12, 13/14 or 15/16, It cancels out. Whassup? If I unplug either left or right input, it is OK, just 1/2 of the stereo, but I can't keep both channels plugged in at the same time. I thought that one of the left or right cables might be wired OOP, so I checked, switched, finally made NEW cables paying careful attention to polarity (RCA to 1/4"). The problem persists, on all 4 stereo inputs! Could Behringer have wired it wrong? Out of phase? Or could they have inadvertently wired the lower (right) input of these pairs as an insert jack, as is the norm on the 1-8 mono channels? I have a Behrigner MX3242x where the main outputs L+R are wired out of phase...... I run a stereo system in a live situation so with the speakers far apart its not easy to tell but to line out to a mono rig which i did a god few weeks after first using the desk it took a few minutes to work out what was wrong.. I just simply wire my cable for the right hand channel out of phase and keep the cables wellmarked. |
#7
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"Blackburst" wrote in message
... I have a Behringer UB2442FX-Pro mixer. When I input a stereo CD, cassette, VCR audio, whatever, into stereo inputs 9/10, 11/12, 13/14 or 15/16, It cancels out. Whassup? If I unplug either left or right input, it is OK, just 1/2 of the stereo, but I can't keep both channels plugged in at the same time. I thought that one of the left or right cables might be wired OOP, so I checked, switched, finally made NEW cables paying careful attention to polarity (RCA to 1/4"). The problem persists, on all 4 stereo inputs! Could Behringer have wired it wrong? Out of phase? Or could they have inadvertently wired the lower (right) input of these pairs as an insert jack, as is the norm on the 1-8 mono channels? The stereo line input connectors on that mixer are TRS balanced and can accept an unbalanced input, just like the mono channel line inputs on ch. 1-8. Input impedance is 20K ohms with a max input level of +22dBu. It should be no problem, but the input devices do play a role here. I'm assuming these are RCA connections on your source devices. Did you try running that same signal into the RCA "Tape In" connection on the mixer? If so, did that work for you? How about into the stereo Aux returns (also balanced)? Two mono channels panned L & R? When running directly to the stereo channel inputs did you get no signal at all, or did you get signal that degraded over a minute or two? This second condition may indicate a buildup of DC on the mixer inputs - a condition which can be rectified with an easy-to-do cable solution. Regards, Jim Savery Global Customer Support Manager BEHRINGER The Americas Tel: 1-425-672-0816 x 111 Fax: 1-425-673-7647 http://www.behringer.com This email is intended exclusively for the addressee(s) named above and may contain privileged and confidential information. If you are not among the intended recipients, you may not copy, utilize or distribute any of the information contained herein. If you have received this email in error, please notify us immediately via return email and delete the original from your mailbox. Thank you. |
#8
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Jim:
thanks for the reply, direct from Behringer Service! I'm assuming these are RCA connections on your source devices. Did you try running that same signal into the RCA "Tape In" connection on the mixer? If so, did that work for you? Yes, the RCA ins work correctly. How about into the stereo Aux returns (also balanced)? Yes. They work correctly. Two mono channels panned L & R? Yes. Correct. When running directly to the stereo channel inputs did you get no signal at all, or did you get signal that degraded over a minute or two? As noted, I DO get a signal with either the L or R cable connected to the stereo channels (half of the stereo field). When I connect both, it drops out completely, as though I were interrupting the signal path. Any suggestions? I have tried re-checking cables very carefully. BTW, it's a great product. I think Behringer makes great stuff for the price point. |
#9
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Blackburst wrote:
As noted, I DO get a signal with either the L or R cable connected to the stereo channels (half of the stereo field). When I connect both, it drops out completely, as though I were interrupting the signal path. Are you sure you are going into a stereo input? Are you sure you are not going into a TRS balanced input? --scott -- "C'est un Nagra. C'est suisse, et tres, tres precis." |
#10
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"Blackburst" wrote in message
... Jim: thanks for the reply, direct from Behringer Service! I'm assuming these are RCA connections on your source devices. Did you try running that same signal into the RCA "Tape In" connection on the mixer? If so, did that work for you? Yes, the RCA ins work correctly. How about into the stereo Aux returns (also balanced)? Yes. They work correctly. [snipped] Any suggestions? I have tried re-checking cables very carefully. BTW, it's a great product. I think Behringer makes great stuff for the price point. One last data point: Have you tried running these stereo inputs with any non-consumer devices. For example a stereo effects processor or stereo keyboard or similar? What were the results? Jim Jim Savery Global Customer Support Manager BEHRINGER The Americas Tel: 1-425-672-0816 x 111 Fax: 1-425-673-7647 http://www.behringer.com |
#11
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On Sat, 11 Dec 2004 16:40:00 GMT, "Jim Savery"
wrote: "Blackburst" wrote in message ... Jim: thanks for the reply, direct from Behringer Service! I'm assuming these are RCA connections on your source devices. Did you try running that same signal into the RCA "Tape In" connection on the mixer? If so, did that work for you? Yes, the RCA ins work correctly. How about into the stereo Aux returns (also balanced)? Yes. They work correctly. [snipped] Any suggestions? I have tried re-checking cables very carefully. BTW, it's a great product. I think Behringer makes great stuff for the price point. One last data point: Have you tried running these stereo inputs with any non-consumer devices. For example a stereo effects processor or stereo keyboard or similar? What were the results? also, what happens if you disconnect the L or R at the OTHER end of the cable (ie. feed only one source, but have two connectors plugged in) Jason |
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