RME LNI-2 DC Low Noise Isolating Active DC Power Filter

RME introduces the LNI-2 DC Low Noise Isolating Active DC Power Filter that is both compact and portable, crafted from a solid block of aluminum. This device offers isolation, regulation, and filtering of output signals from any 12-volt DC power source, leading to a significant enhancement in DC voltage stability and providing an exceptionally clean 12V power supply. This improvement results in superior audio signal quality, ensuring a sound free from humming, buzzing, or other disturbances caused by power supplies or unstable mains power.

The LNI-2 DC is built on two main features: galvanic isolation and RME's exclusive Filter. Galvanic isolation is an advanced method that effectively blocks noise, from low-frequency hums to high-frequency interference and leakage currents, from reaching the filtered DC output. By incorporating galvanic isolation, unwanted noise that could otherwise affect the filtered signal is prevented. This method not only filters the positive DC path but also isolates the ground (negative) between the input and output.

The Filter (micron filter) of the LNI-2 DC comprises a discrete Ultra Low Noise linear regulator with an extremely low noise output of just a few micro-volts, along with features like soft start, thermal overload protection, short circuit protection, and sensor technology.

Operating with power sources ranging from 9-18V DC (input), the LNI-2 DC delivers a steady, precise voltage of 12.0 V at 2 A through the lockable output socket. The integrated sensor technology of the Filter ensures stable output voltage by directly monitoring and comparing the output voltage at the DC connector of the included 4-wire cable, eliminating any voltage drops that may occur with varying loads. Additionally, two DC Sensor connection cables with lockable and non-lockable DC plugs (2.1 x 5.5 mm, 1 m) are provided.

The unit features two status LEDs at the top, indicating input and output voltage levels as well as overload conditions. A unique aspect of the device is the ground terminal screw that allows the DC output ground to be connected to PE (protective earth), ground, or other device grounds as needed to address grounding concerns.

Moreover, the device includes a comprehensive 17-page manual detailing technical specifications with precise measurement values presented through diagrams. The manual also offers insights into linear and switching power supplies for further understanding and reference.

Key Features

• The LNI-2 DC by RME is a compact and portable active DC filter made from a solid block of aluminum, providing isolation, regulation, and filtering of output signals from any 12-volt DC power source.
  
• This device offers an enhanced audio signal and sound quality by improving DC voltage stability and eliminating humming, buzzing, and other noises caused by power supplies or dirty mains power.
  
• The LNI-2 DC features galvanic isolation and RME's exclusive Filter to prevent noise, leakage currents, and other unwanted signals from affecting the filtered DC output.
  
• Galvanic isolation ensures that noise is kept away from the filtered signal, allowing for a clean and stable power output.
  
• The Filter of the LNI-2 DC includes a discrete Ultra Low Noise linear regulator with features such as soft start, thermal overload protection, short circuit protection, and sensor technology.
  
• This device is compatible with power sources ranging from 9-18V DC and provides a fixed voltage of 12.0V at 2A through a lockable output socket.
  
• The integrated sensor technology of the Filter ensures that the output voltage remains stable and avoids load-dependent voltage drops.
  
• The LNI-2 DC comes with two DC Sensor connection cables with lockable and non-lockable DC plugs (2.1 x 5.5 mm, 1m) included.
  
• Two status LEDs on the unit indicate input and output voltage as well as overload conditions, providing visual feedback to the user.
  
• Additionally, the ground of the DC output can be connected to PE, ground, or other devices ground via a ground terminal screw to address ground cabling issues, offering flexibility in installation.

Technical Specifications

DC Input
Input voltage range
9 - 18 V DC
Polarity
Center +, Outside
Connector
2.1x5.5mm, lockable or normal
Power consumption idle
0.7 Watt
Power consumption
typical, 12V input, 2 A load: 31 Watts
DC Output Filter
Output voltage
12.0 V
Continuous output current
2.0 A
Continuous output power
24 Watt
Maximum output current
3.0 A
Noise @ 0 - 3 A, AES17
< 2 V, < 1 V A-weighted
Noise @ 0 - 3 A, 100 kHz bandwidth
<3 V, < 2 V A-weighted
Output impedance including cable
0.012 Ohm
Load Regulation (0/1/2 A)
0.20 %
Overload protection
> 3.0 A
Overheating protection
> 80 Degrees C (176 Degrees F)
Undervoltage detection
< 9.0 V
Short circuit current (LED red)
<0.1 A
Filter (decoupling) efficiency, 10 Hz - 1 kHz
>110 dB
Filter (decoupling) efficiency, 1 kHz - 200 kHz
>70 dB
General
Dimensions (WxHxD)
80 x 30 x 123 mm, 3.15”x 1.18”x 4.84”
Weight
605 g (1.33 lbs)
Temperature range
+5 Degrees C up to +40 Degrees Celsius (41 Degrees F up to 104 Degrees F)
Relative humidity
< 75%, not condensing
Package Contents
LNI-2 DC
DC Sensor connection cable with lockable DC plug 2.1x5.5 mm, 1 m
DC Sensor connection cable with DC plug 2.1x5.5 mm, 1 m
Manual