Palmer wupper Passive Line Isolation Box

The more complex the setup, the higher the chance of ground loops. With the Palmer wupper Line Isolation Box, everything is quiet again so you can enjoy your audio without humming and buzzing.

The Palmer wupper is an isolation transformer in a robust aluminium and steel housing. It separates the ground potentials of two devices so that equalising currents are prevented and only your sound is transmitted - clean and without interference.

The Palmer wupper was developed for guitar and bass applications, but its brilliant, unaltered sound is just as suitable for keyboards and hi-fi equipment. The inputs and outputs with jack connections can be balanced or unbalanced. This means that the Palmer wupper can also be used to balance unbalanced signals, which allows longer cable runs without affecting the sound. Due to its passive design, the wupper requires neither batteries nor phantom power. This makes it extremely failure-proof.

The Palmer wupper is a simple, efficient humming killer: Connect it between two devices and the interference is gone. Sometimes it can be that simple!

Key Features

• Line isolation for guitar/bass/keyboard; also suitable for HiFis and car stereos
• Single channel: Jack input and -output
• Reliably eliminates ground loop hum and interfering signals
• Galvanic transformer isolation
• Can be used to balance signals
• Pure and unaltered sound
• Passive operation: simple and failure-proof
• Distortion-free up to +6 dBu
• Solid casing made of aluminium and steel
• Incl. rewritable tour label for attachment onto the back of the wupper
• Engineered in Germany

Technical Specifications

Product type
line isolator
Channels
1
Type
passive
Transformer isolated
Yes
Inputs
1
input type
balanced/ unbalanced
Input connectors
6.3 mm jack
Outputs
1
Output type
balanced/ unbalanced
Output connectors
6.3 mm jack
Ground lift switch
no
Housing
Aluminium continuous casting
Dimension (H/W/D)
110 x 50 x 50 mm
Weight
0,3 kg
Ambient temperature during operation
-20 - 70 °C
Relative Humidity
< 80 %, not condensing
Accessories (included)
Inscription label (tour label), rubber feet
Max. input level (< 1% THD, 20 Hz)
+ 10 dBu
Max. input level (< 1% THD, 1 kHz)
+ 32 dBu
Frequency response (±0,2dB, relative 1kHz)
20 Hz - 20 kHz
Input impedance (1 kHz)
17 kOhm
Output impedance (1 kHz)
500 Ohm(s)
THD (30 Hz, +4 dBu, unity, unweighted)
< 0,09 %
THD (1 kHz, +4 dBu, unity, unweighted)
< 0,002 %
IMD (SMPTE) (60 Hz / 7 kHz, 4:1, +4 dBu)
< 0,002 %
Transformer ratio
1 : 1