No, because 3DH requires pre-exchanged public keys. For Signal, this key exchange might happen automatically, but you still need to manually compare the fingerprints to achieve authentication.
A regular Diffie-Hellman key exchange is not authenticated, meaning that you don't know who you establish a key with. To authenticate this key exchange, you would need some prior security context (e.g., some shared secret or TLS certificates).
In pairing scenarios, you often do not have a prior security context, since the goal is to establish one in the first place. Our approach works without a prior security context by using the physical signal propagation properties of the acoustic signals.
Acoustic communication is quite nice for this kind of ad-hoc provisioning, because it doesn't require any special hardware or prior pairing.
One security issue is that if you do this in public, an attacker could initiate malicious connections and remove your own transmission via signal cancellation. It's hard to notice that when using an inaudible frequency band. To defend against this, our research team has described a method to protect the integrity of acoustic communication on the physical layer, without requiring any prior key exchange: https://dl.acm.org/doi/10.1145/3395351.3399420 PDF: https://arxiv.org/pdf/2005.08572