Kemper+Camplifier+Kemper Kones Issue

  • Hi All,

    A few weeks ago I bought 4 Kemper Kone speakers to put into a 4x12 cab. With this rig I'm using an unpowered head with a Camplifier power amp installed (https://digitalguitargear.com/camplifier-SHP/). Of course with the Kones the sound is so much better than running cab off through a Marshall 4x12 with traditional guitar speakers. I'm running into an issue, though, where randomly the volume will drop significantly, stay that way for a while (so I'll turn the output level up) then out of nowhere, it goes back up to it's original level.

    This has only happened since I started using it with the Kemper-loaded 4x12 cab. Prior to that I was using it with a Marshall cab with WGS guitar speakers. While the sound was not as good, the volume dumps/jumps never happened.


    So I'm thinking it's got to be something with my wiring right? I wired them Series/Parallel as per the instructions that came with the Kones. Testing the impedance, it reads 4.2 ohms, kinda jumping between 4.2-4.4 - So I had a friend come over the other night, who's a lot more experienced with this type of thing (licensed Master Electrician, brilliant soundman, builds PA rigs etc), he measured & got the same results I'm getting.


    All the solder joints are tight, no movement whatsoever, however I'm not the best solder-er in the world so my solder joints aren't the best & there's undoubtedly too much solder on those joints - do you think that might be causing an issue with the continuity of the impedance of the signal flowing through these solder joints? That's the only thing I can think of & if that's the case could it be the amp dropping power to protect itself?

    Any other ideas? Thanks in advance!

  • Sounds like you got the impedance right for series/parallel.

    I highly doubt that too much solder would ever be an issue. Bad/loose connections, absolutely.

    So if one half of the parallel was connecting/disconnecting, that might produce a volume variation.

    Maybe disconnect half the speakers and try for consitency, then the other half

  • I've taken the cabinet over to a friend's shop, dude's basically an electronics wizard, he's just gonna rewire the cab for me, that way if the issue is still there, I'll know it's not the speaker cab and can move on to another troubleshooting step.

  • Update, I took my cab to my amp tech (well, he's not MY amp tech, but the local guy who's basically a wizard with this stuff) and had him rewire the cab with new wire and a new jack, got it home and within 20 minutes the volume was dropping. So I know now it's not the cab.

    The output of the Camplifier is 4 ohms. So it should be a perfect match. I've emailed Tilman Ritter (maker of the Camplifier) and also tagged him on a post on Facebook, hopefully he'll see it soon and be able to offer a solution, the Camplifier is less than 3 months old and has been used sparingly, and not at very loud volume...

  • Update, I took my cab to my amp tech (well, he's not MY amp tech, but the local guy who's basically a wizard with this stuff) and had him rewire the cab with new wire and a new jack, got it home and within 20 minutes the volume was dropping. So I know now it's not the cab.

    The output of the Camplifier is 4 ohms. So it should be a perfect match. I've emailed Tilman Ritter (maker of the Camplifier) and also tagged him on a post on Facebook, hopefully he'll see it soon and be able to offer a solution, the Camplifier is less than 3 months old and has been used sparingly, and not at very loud volume...

    Tilman is a great guy. He'll take care of you for sure.

  • Thinking about it I had this issue with a tube amp a few years ago. Was an input issue. This may not be applicable here but the bottom channel one input on a Marshall style (four input) was going bad. Had the inputs replaced and all was once again well. Again good luck...let us know the root cause.