Sonos Amp and 3rd party subwoofer issue

Yes

Maybe there’s a fault - you could try connecting it at the speaker-level instead, as stated in its user-manual, or try a different cable - if no luck, then perhaps contact Sonos Support Staff via this LINK

Hope you manage to get it sorted.

So with all these issues I think the best solution is using your 3rd party subwoofer without the use of the sub port.

Connect the amp to the subwoofer via the speaker output to the subwoofer speaker input.

Then connect your speakers to your subwoofer via speaker output

This is used for amps without the subwoofer output possibility.

Any cons for this configuration? This shoud work IMHO for 2.1 and 4.1 So the fronts are connected to the subwoofer and the sub WILL work With wireless sonos surround speakers. IAm I missing something (considering to the ones whoa have speaker input AND speaker output on their subwoofer)

Hello, folks. I am new here. I have used Sonos equipment for many years. I am replying because I had this same issue with the very same Klipsch subwoofer. I solved it, so I wanted to share. I think, but I am no expert, that the LFE output is set up for a 5.1 system. I am just running a 2.1 system. Nothing seemed to work with the cables I was using, and I had lots of buzziness from interference. The fix turned out to be very easy. I ordered decent but not obscenely priced Y cables which were insulated, plugged them in, and, boom, the sub was up and running, and, wow, this is a powerful set up. For my apartment, the sub verges on too much, and it is probably rattling the ceiling of the unit below. But all I needed was a set of Y cables, from Amazon, and I’m all set.

I use a Sonos Amp connected via Line-In to my computer. I’m using Definitive Technology bookshelf speakers (ProMonitor 800s) and a matching Definitive Sub. I have been having the same issues - no sub output from the Sonos Amp. I tired several things, including unplugging/plugging in the sub along with trying different outlets in the room. Ultimately, what WORKED is setting the volume level in the Sonos App on the Line-In output (my Amp) above 50. Then I adjusted the volume on my computer to suit. This kicks the sub on … perhaps because there’s more “power” coming from the Amp. I have experienced this before with subs that have power, but an auto switch (no native on/off manual switch). Try it if you’re having issues. It worked for me, and it kind of makes sense. You have to force the sub to kick on, and the best way to do this is from the Amp itself, through the App. PLease let me know if this works for you as well. I would be interested to see if this is a widely acceptable solution. 

Me too.. with Polk Audio Outdoor Subwoofer :(

Very glad I found this thread.  We have (4) Episode rock speakers in our back yard around our pool, and two Def Tech AW6500 under the porch aimed at the pool...all setup on Sonos.  I was looking for a cost effective way to add more bass back there and was going to wire up a Klipsch 12” sub under the covered deck, that I would likely move inside when we weren’t out there using it so that it wouldn’t be subjected to temp changes and humidity.  Sounds as if I may waste a lot of money doing so.

Can anyone else confirm that high quality, shielded sub cables and Y adapters solved the issue?  Thanks!

I’m Exhausted. Searched the web for hours. Read this thread 2 times. 

I have a Sonos Amp. Trying to use the SUB out on it. Yes, it has the latest firmware.

Brand: OSD Audio Model Name: FORZA 10 Sub running thru an external Amp. Using an RCA Y cable from Sonos Amp Sub out to the line in on the Amp. Zero on the Sub. I do get the Sub enable/settings once I plug in the RCA but thats it. Useless.

Other than buying a Sonos Sub, What Amp works with this. The external AMP for this Sub is Nobsound G2 PRO Hi-Fi 300W Subwoofer Power Amplifier Mono Channel Class D SUB Audio Amp. 

But like so many others here, struggling to get this to work. 

Any help is greatly appreciated.

Why the Y cable?

A simple male-male RCA is all that should be needed.

If you connect another audio source to the external amp’s input using your cable can you hear anything?