JTS SIEM-2 Mono In Ear Monitoring System (638~662 MHz or 520~544 MHz)



Upon first hitting the market, the JTS SIEM-2 broke the price barrier for in ears. Suddenly anyone and everyone could enjoy good affordable in ear monitors instead of relying on wedges!

This system is available in either the 638~662 MHz or 520-544 MHz ranges. To see which frequencies will operate in your area please use the ACMA Channel Finder at

Developed with JTS advanced wireless technology. Wired and wireless design for ambience. UHF PLL 16 selectable channels. Over 60 meters of stable operation distance. Outstanding signal to noise ratio. Light weight engineering plastic chassis. Built in limiter to protect hearing. Very affordable. IE-1 Ear Pieces This wideband dynadriver earphone reproduces full range of frequency, natural mids, and full highs and bass. It delivers sound musicians want and should be heard with full detail. Three pairs of silicon sleeve are provided with different sizes for best fitting and sound isolation. Human friendly mechanical structure ensures long time fatigueless wearing. Ergonomic design for long-time wearing without fatigue.

Warranty: 12 Months

SIEM-2T 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: -20 dBV
Maximal Input Level: 0 dBV
LED Display: AF Level, Channel Audio
Input Connector: 2 x Balanced XLR
Loop Out Connector: 2 x Ø6.3mm Balanced Loop Out Socket
Operation Voltage 12-18 VDC, 600 mA



Frequency Preparation: PLL Synthesized Control
Carrier Frequency Range: 638~662 MHz (or 520-544 MHz)
LED Display: Channel Controls Power On/Off, Channel selection, Volume control 
Audio Frequency Response: 40~18,000 Hz
Output connector: 1/8” Dummy stereo Phone Jack
Battery life: 14 hours typical
Battery: 2 x AA batteries


IE-1 Ear Pieces

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 10 of the SIEM-2 Owner's Manual

Click here to download pages 11 to 20 of the SIEM-2 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.