• HMa-B1 plug-on transmitter angled front view showing 506.325 MHz LCD display, AUDIO and FREQ buttons, and female XLR input, Lectrosonics
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Lectrosonics HMA-B1 Plug-On XLR Wireless Transmitter

Lectrosonics HMA-B1 Plug-On XLR Wireless Transmitter

SoundPro Item: 91530 | Part Number: HMA-B1

$1,455.00
$1,615.00 $1,455.00
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MSRP: $1,615.00 | MAP: $1,455.00

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  • Digital Hybrid Wireless Encoding Eliminates Compandor Artifacts For Transparent Audio
  • Selectable Phantom Power Supports Condenser, Dynamic, And Line Level Sources From One Unit
  • Wide Tuning Range With Selectable Step Sizes For Dense RF Environment Management
  • Compatibility Modes For Legacy Lectrosonics Mode 3 And IFB Receivers
  • Dual Envelope Soft Limiter Delivers Over 30 dB Of Headroom Above Full Modulation
  • IR Port Enables Fast Setup Via IR-Enabled Receivers
  • Solid Machined Aluminum Housing Built For Repeated Use In Professional Production
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The Lectrosonics HMa is a plug-on wireless transmitter designed for audio engineers and production teams who need to convert any XLR microphone or line-level source into a professional wireless channel without swapping capsules or rewiring. It slots directly onto any standard 3-pin XLR output, making it practical for theater, broadcast, corporate AV, and touring applications where flexibility across mic types is essential.

Digital Hybrid Wireless technology sits at the core of the HMa's performance advantage over conventional analog compandor-based systems. Audio is digitally encoded at the transmitter and decoded at a compatible receiver, traveling over an analog FM RF link. The result is a system free of compandor artifacts with a frequency response of 35 Hz to 20 kHz, THD as low as 0.2%, and an input dynamic range of 125 dB with full transmitter limiting. Selectable phantom power at 5, 15, or 48 volts supports condenser microphones across the full range of professional capsule types, while the off setting accommodates dynamic mics and line sources without additional adapters.

For engineers working in environments with congested RF spectrums, the wide tuning range and selectable 100 kHz or 25 kHz frequency steps provide precise channel placement across thousands of available frequencies. Compatibility modes for legacy Lectrosonics Mode 3 and IFB receivers protect investments in existing receiver infrastructure. The solid machined aluminum housing, IR port for fast receiver pairing, and USB port for firmware updates make the HMa a durable, field-serviceable tool built for the demands of professional production.

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Specifications

RF Performance
Frequency Selection Steps
Selectable; 100 kHz or 25 kHz
Frequency Stability
+/- 0.002%
Pilot Tone
25 to 32 kHz; 5 kHz deviation (Digital Hybrid mode)
Spurious Radiation
60 dB below carrier
RF Power Output
Selectable 100 or 50 mW
Operating Frequency Bands
Band B1: 537.600 - 607.950 MHz
Audio Performance
Frequency Response
35 Hz to 20 kHz (+/-1 dB)
Low Frequency Roll-Off
Adjustable for -3 dB at 30, 50, 70, 100, 120, or 150 Hz
THD
0.2% typical (100 Hz to 20 kHz)
Equivalent Input Noise
-125 dBV (A-weighted)
Input Dynamic Range
125 dB (with full Tx limiting)
Input Level
Nominal 2 mV to 300 mV before limiting; greater than 1V maximum with limiting
Input Impedance
1K Ohm
Input Limiter
Dual envelope soft limiter; greater than 30 dB range
Gain Control Range
55 dB
Signal To Noise Ratio (SmartNR Off, No Limiting)
103.5 dB
Signal To Noise Ratio (SmartNR Full, With Limiting)
113.0 dB
Connectivity
Audio Input Jack
Standard 3-pin XLR (female)
Phantom Power
5V @ 18 mA max.; 15V @ 15 mA max.; 48V @ 4 mA max.; plus OFF
USB Port
Firmware updates
IR Port
Fast setup via IR-enabled receivers
Antenna
Housing and attached microphone form the antenna
Compatibility
Compatibility Modes
Nu Hybrid, Mode 3, IFB
Emission Designator (Band A1)
44K3F3E
Controls
Controls And Indicators
Power/Phantom ON-OFF; Phantom voltage selector; Audio input gain; LCD with membrane switches; LED audio level indicators
Modulation Indicators
Dual bi-color LEDs indicate modulation at -20, -10, 0, +10 dB referenced to full modulation
Power
Battery
Two 1.5V AA alkaline
Battery Life (No Phantom Power)
5h 0m (AA alkaline, Duracell Ultra)
Battery Life (48V Phantom Power)
3h 30m (AA alkaline, Duracell Ultra)
Environmental
Operating Temperature Range
−20 to 50 degrees C / −5 to 122 degrees F
Dimensions
Dimensions
4.25 x 1.62 x 1.38"
Weight
Weight
6.7 oz (190 grams) without batteries
Included Items
Included Accessories
2 AA alkaline batteries; 1 HM pouch (PHTRAN3); 1 Quickstart Guide

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