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Can I connect a Sonos Connect (ZP90) to a subwoofer amplifier instead of a stereo amplifier?  I only want the low freqencies so I can use a wall subwoofer with my Sonos Ones.

Note that ZP90 is an S1 only, line level device. ZP90 cannot drive passive subwoofers.

Also, there is a 75ms latency between a SONOS Line-In and output from a Line-Out. If you Group ZP90 with the high frequency SONOS player, both lows and highs will be time aligned, otherwise the ZP90 will be 75ms late.

Don’t attempt to use ZP90 as a simple wireless subwoofer extension for output from your receiver.

Finally, ZP90 has no low pass filter.