When I plug in an instrument cable into either input from an acoustic guitar I'm hearing a low hum sound. It's get louder as I turn the volume up louder. It occurs both on AC power and on battery. I've tried multiple instrument cables. I've plugged it into multiple outlets in the house. I've used multiple acoustic guitars with active pickups. If I plug in a microphone into either input I'm not hearing the low hum at all only instrument cables. Is this normal or do I need to send in for service I haven't had it for more than 60 days at the most.
Are all of these AC sockets in the same building/structure, @HumdingerChas ?
Welcome to the Bose Portable PA Community.
It sounds like a lot of good troubleshooting and diagnostics.
I'd expect some hum if the cable is inserted into the S1 Pro, but not connected to something at the other end. This is just a big antenna for noise. But it should stop when you connect it to a properly wired guitar.
If the hum persists even when you are running unconnected to AC power, this eliminates common ground-loop problems.
If you've tried different cables, that eliminates any one cable as the source, but you want to make sure the cables are not running near any other devices or cables.
Do you have a short cable (less than 10 feet)? The longer the cable, the greater the likelihood you'll pick up noise. That is much less likely with XLR cables because they are balanced.
There's another thing to try - take the S1 Pro and out to a different physical location, run it on the battery. Do you still hear the hum?
If so, then please call Bose Support.
Bose® Product & Technical Support at (877) 335-2673
(U.S. and Canada only)
Monday-Friday: 9:00 AM - 9:00 PM ET
Hi ST I've used a 6ft cable in my kitchen and den and also on my back deck with just the battery on and still have the hum with a guitar plugged in. I've plugged the guitars into a Crate Taxi Limo amp and don't get a hum through it. I'll call support on Monday seems like I have a defective unit.
I called the support number and they're going to send me a replacement out today, excellent service again from Bose. Thanks everyone for your quick replies on my post.
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