Modular Speaker Mic for Kenwood radios using the standard 2-pin accessory connector. Functions as a rugged standalone speaker mic for patrol, or plug in a tactical headset via the top-mounted Nexus port and the MSM becomes a push-to-talk hub, speaker auto-mutes, audio routes to your ears.
How It Works
Patrol Mode
Use as a standard speaker mic. Clip to shoulder strap or vest. Omni-directional microphone captures voice from any angle, no need to lean into the mic.
Tactical Mode
Plug a headset into the Nexus port. Speaker auto-mutes. Audio routes to your ears. The MSM becomes your PTT, press front or side button to transmit through the headset mic.
Key Features
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Dual-Role Operation: Use as a standalone speaker mic for daily patrol. Plug a headset into the Nexus port and the MSM becomes a PTT, speaker auto-mutes, audio routes to your ears. One device, two modes.
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Dual PTT: Oversized front button for quick keying plus a secondary side button, both work with gloved hands.
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Amplified Nexus Port: NATO-wired Nexus connector with built-in amplification for low-impedance dynamic headsets, Ops-Core AMP, 3M Peltor ComTac, MSA Sordin, David Clark, and other tactical headsets with U-174/U plug. Speaker auto-mutes when headset is connected.
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IP67 Sealed: Dust-tight and submersible to 1 meter for 30 minutes. Built for rain, mud, and standing water.
2-Pin Connector Limitation
The 2-pin connector provides audio and PTT only, it does not carry control data for accessory features like emergency activation, volume adjustment, or programmable buttons. If you need those features, consider upgrading to a radio with a multi-pin accessory connector.
Compatible Radios
Kenwood TK-2100, TK-2200, TK-2300, TK-2302, TK-3200, TK-3300, TK-3400, NX-P1200, NX-P1300, NX-1200, NX-1300, NX-220, NX-240, NX-320, NX-340, NX-420, ProTalk series, and other Kenwood radios with 2-pin accessory port.
Rapid Radios: Compatible with Rapid Radios.
Headset Compatibility
The amplified Nexus port is designed for headsets with dynamic (low-impedance) microphones:
- Ops-Core AMP (via U174 Monaural or Monobinaural Downlead)
- 3M Peltor ComTac V/VI, SWAT-Tac
- MSA Sordin Supreme Pro-X (Mil-Spec)
- David Clark H10-76 series
- Any NATO-wired headset with U-174/U plug and dynamic microphone
Electret microphone headsets are not supported by this amplified variant. Contact us for electret-compatible custom orders.
Need a PTT Without a Speaker Mic?
The MSM is built for operators who need both modes, speaker mic on patrol, headset PTT on operations. If you run a tactical headset full-time and don’t need a speaker mic at all, the Constant Able is a lighter, simpler, purpose-built PTT.
Constant Able PTTs connect directly to your radio with no speaker mic in the chain. Auto-switching impedance detection handles both dynamic and electret headsets automatically, broader headset compatibility than the MSM’s dynamic-only Nexus port. Available for Motorola APX, Motorola XTS, Kenwood, L3Harris, Hytera, Icom, Baofeng, and NATO 6-pin radios.
Specifications
| Radio Connector |
Kenwood 2-Pin |
| Headset Port |
Nexus (U-174/U), NATO wired (Amplified) |
| Earpiece Port |
3.5 mm listen-only |
| Microphone |
Omni-directional, −42 dB ±3 dB |
| Speaker |
36 mm dynamic, 1 W (1.5 W max), 91 dB ±3 dB |
| PTT |
Dual, oversized front + secondary side |
| Emergency |
Not available (2-pin connector limitation) |
| Volume |
Not available (2-pin connector limitation) |
| IP Rating |
IP67 (dust-tight, 1 m submersion / 30 min) |
| Cable |
Kevlar-reinforced coil cord, 50,000 flex cycles, 13 kg pull strength |
| Temp Range |
−25°C to +60°C operating |
| Frequency Range |
580 Hz – 5 KHz |
| PTT Switch Life |
100,000 cycles |
| DISCO32 SKU |
MSM-50-KW1A-03A |
Warranty
DISCO32 limited warranty, 1 year from original purchase for defects in materials and workmanship under normal use. Support starts with a troubleshooting ticket at help@disco32.com. Valid claims are repaired or replaced per store policy. Same terms for Constant Able, U-94, and MSM sold by DISCO32.
Full store policy.
