Use Connect with existing powered sub?

Where are the other frequencies going? Do you mean a Connect, or a Connect::Amp?

Connect only
I have a few play 1 around the house.
I was wondering if I could use this existing sub if I also bought a playbase as I'm thinking of removing my current AV receiver and speaker system to create space.

Then the short answer is no, i am afraid. The only Sub that can be used with the Playbase is the Sonos Sub. I haven't heard the Playbase so I don't know what its built in sub is like.

Thank you John.
Could this connect and existing sub be used with the play 1 speakers or does the same apply to your previous answer?

Same applies I am afraid. But why do you have a Connect? What are you currently using it for?

I had it to connect my existing av and kef speakers and then a CD player also I used it recently as I have Beoplay A9, the sound is very low so the speaker had to have the volume very high to get any value so don't have it connected any more.

Well, the volume shouldn't have been low. Possibilities include:
1. You ran the line out of the Connect into a phono input connection. That would sound rubbish.
2. You never tried setting the output level on the Connect to Fixed rather than variable, Sometimes the "variable" setting can cause a volume clash.

You might try again and if necessary involve Sonos Support.

If you used the AV receiver and speakers with the Connect, and if the receiver has a sub connection, that would be the only way I can think of to involve your existing sub.

Thanks for your help and feedback John, appreciated.

Thanks for the support.