MXL 991 small diaphragm condenser pair w/ case and Shock mounts

The MXL 991 is a small-diaphragm condenser mic built around a 6-micron gold-sputtered diaphragm, designed primarily as an instrument mic rather than a vocal mic. With a wide cardioid pickup pattern and a brighter voice than its big-diaphragm sibling the MXL 990, the 991 has earned a reputation as a budget-friendly workhorse for close-miking acoustic instruments and as a drum overhead pair.
This listing is for a matched pair, previously owned and used moderately, now being passed along in good working order. Both mics power up and function properly with no issues — clean signal, no crackling or dropouts. As budget-friendly microphones, they're a great option for any home or project studio environment, offering a clear, transparent sound that works especially well on drums and acoustic guitars. Cosmetically, both mics show some expected wear from use — most notably the printed labeling on the mic bodies has started to rub off — but there's no damage to report beyond that. Each mic comes with its shock mount and windscreen, and the set ships in a black, foam-lined carrying case. It's not the original MXL case, but everything fits inside it without issue.
Spec sheet
- Make: MXL
- Model: 991
- Quantity: Pair (2 microphones)
- Type: Small-diaphragm condenser
- Polar pattern: Cardioid (wide cardioid)
- Diaphragm: 20mm, 6-micron gold-sputtered
- Frequency response: 30Hz - 18kHz
- Power requirement: 48V phantom power
- Recommended use: Acoustic guitar, drum overheads, instrument close-miking
- Modifications: None
- Includes: 2x MXL 991 microphones, 2x shock mounts, 2x windscreens, foam-lined carrying case (non-original)
Shipping
Ships carefully packed and insured for full value.
International buyers are welcome — please contact us for a shipping quote before purchasing.
About Mill River Music
Mill River Music is an independent, human-powered music shop located in downtown Northampton, MA, run by a team of players, enthusiasts, and certified repair technicians. Every piece of used gear we sell is personally inspected, tested, and set up before it ships — we don't list it until we'd be happy to play it ourselves.
As Martin and Taylor certified techs, we hold our guitar work to a high standard, and we're committed to full transparency about the condition of everything we sell. No surprises.
When you buy from Mill River, you're supporting an independent local business that genuinely cares — about gear, about players, and about doing things right. We're here every step of the way. Reach out anytime.