Thank you for reaching out via the Bose Community.
With regret, we are not trained to support professional products via this site. For support for the Freespace IZA 2120-LZ Amplifier, I would recommend reaching out to our pro team over at the Pro Community site here.
With that being said, the SoundTouch Wireless Link adapter can connect to any device that supports an audio input which the IZA 2120-LZ features, so yes, you will be able to use the adapter with the amplifier.
I hope this helps.
Jeff G - Community Support
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