We tested 500 LinkedIn DMs vs 500 voice notes to the same persona, same campaign. Written DMs: 4.2% reply. Voice notes: 14.1% reply. Same prospects. Same value prop. The difference was the medium.
Here's why voice notes work, and the 30-second structure we use for every voice opener that converts.
When to use voice notes (NOT always)
Voice notes don't work for every persona. They work best when the prospect is curious about WHO sent them, and curiosity scales with seniority. C-level execs reply at 18% to voice notes; junior managers reply at 6%.
Three rules for when to deploy voice notes:
- Persona seniority: VP and above. Below that, voice notes feel intrusive
- Connection status: 2nd-degree (mutual connections shown). Cold 3rd-degree gets ignored
- Industry: tech, services, finance work. Manufacturing and healthcare = lower reply rates
The 30-second structure
Length is the most important variable. Under 30 seconds: high reply rate. Over 60 seconds: people skip without listening. Aim for 25–30 seconds with this structure:
- 0–5s: First name + your name + ONE sentence about why you're reaching out
- 5–15s: The specific signal you noticed (their post, their hire, their funding)
- 15–25s: The hypothesis. What you think they're dealing with right now
- 25–30s: Low-friction CTA. "shoot me back a quick yes/no, no pressure"
Recording: script vs spontaneous
Fully scripted voice notes sound robotic. Fully spontaneous ones ramble. Best results come from a bulleted outline (4 lines, max) and 2 takes per recording.
Pro tip: record 5 variations of the SAME script across different prospects. Pick the one with the most natural energy. The first take is rarely your best one.
Following up after a voice note
If no reply within 4 days, send a 1-line written DM: "Hey {{name}}, did my voice note come through? Curious if the timing made sense." This recovers ~3% of non-replies. They often forgot or missed the notification.
Never send a SECOND voice note. It crosses the line from "interested SDR" to "stalker."
- Voice notes 3× the reply rate of written DMs, but only for the right persona
- Keep it under 30 seconds with a clear 4-beat structure
- Bulleted outline beats both full script and pure spontaneity
- Follow up with text, not another voice note
