Shure MX391/C Microflex Cardioid Boundary Microphone
pro_audio
Not enough sold data for a typical price — 26 sales on record all-time.
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Not enough sold data for a typical price.
For sale right now
The best-priced as cards, a row of them; every other ad as a line, by ask. Each ask is the seller’s own number; the platform’s mark opens the listing. Each one says when we last confirmed it at its source: the price and availability are from that visit, so check the marketplace before you go.
Nothing live right now on the platforms we track.
Price history
Every recorded sale, one point each: 25 of them, placed by the day the ad went up. Too few sales to draw a trend through them without inventing one, so the points speak for themselves. Condition is mixed, so some of the spread is a mint against a fair rather than the market moving.
Recent sales by listing date
| Listed | Price | Condition | From | Platform | The listing |
|---|---|---|---|---|---|
| 21 Jul 2026 | €63$70 as sold | very good |   France | Reverb | Details |
| 25 Jun 2024 | €197$229 as sold | mint |  United States | Reverb | Details |
| 22 Mar 2024 | €77$90 as sold | excellent | United States | Reverb | Details |
| 10 Oct 2023 | €89$103 as sold | good |  Italy | Reverb | Details |
| 13 Sept 2023 | €228$265 as sold | new | United States | Reverb | Details |
A date is the day the ad went up. Marketplaces do not publish the day a sale closed; each of these had sold by the time we recorded it, in August 2026 and October 2026. A price is what the listing last asked, converted at that day’s rate.
Show the last 25 of 26 recorded sales
| Listed | Price | Condition | From | Platform | The listing |
|---|---|---|---|---|---|
| 21 May 2024 | €197$229 as sold | mint | United States | Reverb | Details |
| 3 Aug 2023 | €218$254 as sold | mint | United States | Reverb | Details |
| 21 Jun 2023 | €237$265 as sold | new | United States | Reverb | Details |
| 10 Jun 2023 | €197$229 as sold | new | United States | Reverb | Details |
| 17 Apr 2023 | €52$61 as sold | excellent | France | Reverb | Details |
| 20 Mar 2023 | €197$229 as sold | new | United States | Reverb | Details |
| 8 Mar 2022 | €20$23 as sold | good | United States | Reverb | Details |
| 8 Feb 2022 | €52$60 as sold | excellent | United States | Reverb | Details |
| 29 Jan 2022 | €60$70 as sold | excellent | United States | Reverb | Details |
| 11 May 2021 | €155$180 as sold | mint | United States | Reverb | Details |
| 6 Jul 2020 | €197$229 as sold | new | United States | Reverb | Details |
| 23 Mar 2020 | €215$251 as sold | new | France | Reverb | Details |
| 9 Oct 2019 | €165$192 as sold | new | United States | Reverb | Details |
| 4 Jul 2019 | €169$196 as sold | new |  Canada | Reverb | Details |
| 8 Mar 2018 | €198$229 as sold | new | United States | Reverb | Details |
| 15 Mar 2017 | €165$192 as sold | new | United States | Reverb | Details |
| 9 Aug 2016 | €166$192 as sold | new | United States | Reverb | Details |
| 9 Aug 2016 | €165$192 as sold | new | United States | Reverb | Details |
| 30 Jul 2016 | €165$192 as sold | new | United States | Reverb | Details |
| 29 Jan 2016 | €157$182 as sold | new | United States | Reverb | Details |
A date is the day the ad went up. Marketplaces do not publish the day a sale closed; each of these had sold by the time we recorded it, in August 2026 and October 2026. A price is what the listing last asked, converted at that day’s rate.