JTS SIEM-111 Stereo In Ear Monitoring System (638~662 MHz or 520~544 MHz)



This system operates in either the 638~662 MHz or 520~544 MHz frequency range. To learn which frequencies will operate best in your area please use the ACMA Channel Finder at

The original JTS SIEM-101 In Ear Monitoring system was based on the reliable PLL wireless technology found in their popular US series wireless microphone systems, bringing high quality stereo in ear monitoring to an affordable price point in Australia. Typical of JTS, there were no compromise on features in the design SIEM-101. Now in stock is the new updated version of the SIEM-101 the SIEM-111. This system includes transmitter, receiver and IE-1 earpieces. Upgrade to IE-6 earpieces available.

Warranty: 12 Months

961 selectable UHF channels available. As many as 16 sets of SIEM-111T transmitters can operate on the same stage. This system operates in the 638-662 MHz range thus ensuring that it will operate well into the future. The system offers 4 groups, with each group having 16 compatible preset channels to choose from. This allows the monitor engineer to set up systems quickly and easily. All metal case construction on the SIEM 111R and SIEM 111T The JTS advanced circuitry assures outstanding signal-to-noise ratio. IE-1 earphones seal off the ear canal with JTS designed Dyna-Driver ear buds which reduce undesired stage noise, ambient sound levels. 3 pairs of different sized Silicon sleeves included with the IE series earphones ensure a right fit for the users ear canal and comfort.

SIEM-111T Transmitter

Carrier Frequency Range: 638~662 MHz or 520~544 MHz
RF Output Power: 10 mW
Nominal Frequency Deviation (modulation): ±40KHz
Audio Input Impedance: 20kΩ
Nominal Input Level: -10 dBV ; 0 dBV (ATT-10 dBV)
Maximal Input Level: 10 dBV ; 20 dBV (ATT-10 dBV)
LCD Display: AF Level, Stereo/Mono, Attenuation Level, Group, Channel, Frequency
Audio Input Connector: 2 x Balanced XLR /Ø6.3mm phone Combo Socket
Audio Output Connector: 1 x 1/8” Stereo Phone Jack, 1 x 1/4” Stereo Phone Jack
Loop Out Connector: 2 x Balanced Loop Out Socket
Switching Power Supply: 100-240V Switching power supply


SIEM111-R Receiver

Input Level Select Switch: 0dB / -10dB
Earphone Output: 60 mW
Minimum Load Impedance: 16Ω
LCD Display: RF Level, Lock-On, Battery Fuel Gauge, Stereo/Mono, HF booster, Dynamic Limiter, Group, Channel, Mute, Frequency
Output Connector: 1/8” Stereo Phone Jack
Power Supply: 2 x AA batteries
Operation Hours: Over 12 hours


IE-1 Earpieces

Frequency Response: 20 Hz -18 kHz
Transducer Type: Dynamic
Impedance: 16Ω
Sensitivity (at 1 kHz): 114 dB/mW
Max. Input Power: 150mW
Distortion: Less than 0.3%
Cable length: 148cm Net
Weight: 6g (excluding cable)
Output connector: Gold-plated 3.5mm phone, Stereo
Accessories: Three pairs of Silicon Sleeves (small, medium, and large)

Click here to download pages 1 to 12 of the SIEM-111 Owner's Manual

Click here to download pages 13 to 22 of the SIEM-111 Owner's Manual

Click here to download pages 23 to 26 of the SIEM-111 Owner's Manual

Order weight is calculated on whichever of the dead (actual) or volumetric weight is the greatest. As of 10/9/21 capped $8.80 to $16.50 for up to 20kg to most areas. For orders under $50 options are Standard Postage $8.80 or Express Shipping for $16.50. Orders over $1,000 ship for free. Express Shipping covers one delivery attempt so please provide an address where someone is available to sign for courier delivery between 9am and 5pm weekdays. You can instruct us to ask the courier to leave your parcel unattended in a safe place, although please be aware that if anything happens to the parcel, neither us nor the courier company can be held responsible. Work addresses are a great delivery option. If using a work address please include the business' name.

* for some larger items does not apply to Australian remote island locations, some mainland remote locations (outside Darwin NT and Perth WA metro areas) or outside Australia. If unsure if you are entitled to capped shipping it is best to contact us prior to placing order.