Hi @scrub
Welcome to the Sonos Community!
I’m sorry to hear about this issue you are having with your Sonos Ace headphones - no, you should not need to turn on ANC to get decent bass from the headphones. This is not something I have heard of before, but there are a few things we can try.
First, please connect with Bluetooth your Ace headphones to the smartphone you have the Sonos app installed on and open the app. You should see an option “tap to control Sonos Ace”. Tap that, and you’ll see a screen for Ace. Tap on the picture of the Headphones and if there is a software update available indicated at the top of the screen, please install it.
If the headphones were already fully up to date, please try a reboot of the headphones:
- Disconnect Sonos Ace from any USB-C cable connections.
- On the left ear cup, press and hold the Power/Bluetooth button for about 3 seconds. Sonos Ace will play a power-off tone and the status light will turn off.
- Wait 10 seconds.
- Press and hold the Power/Bluetooth button for about 3 seconds to turn Sonos Ace back on.
And if that does not help either, please try a reset of the headphones:
- Sonos Ace will need a powered USB-C connection during part of the reset process. Get a USB-C cable ready by connecting it to a power source, like a laptop or a wall adapter, but don’t connect it to Sonos Ace yet.
- Make sure your Sonos Ace is powered on.
- Press and hold the power button on Sonos Ace, then immediately plug the USB-C cable into the USB-C port on the left ear cup.
- Continue holding the power button until Sonos Ace’s status light flashes white, about 7 seconds.
- After the status light flashes white, unplug the USB-C cable from Sonos Ace and release the power button.
Once reset, Sonos Ace will go into pairing mode and show a flashing blue status light.
After resetting Sonos Ace, you can reconnect it to a previously-used device, but you first need to remove it from your device’s list of remembered connections. To do this, open your device’s Bluetooth or Connected Device settings, select Sonos Ace from the list, then choose Forget or Remove.
Finally, if that does not help either, I recommend you get in touch with our technical support team who have tools at their disposal that will allow them to give you advice specific to your Sonos system and what it reports.
I hope this helps.