Palmer RIVER wupper - Passive line isolation box
The more complex the setup, the greater the risk of ground loops. With the Palmer wupper Line Isolation Box, everything goes quiet again, so you can enjoy your sound without hum and buzz.
Palmer wupper is an isolation transformer in a rugged aluminium and steel housing. It separates the ground potentials between two devices, preventing equalisation currents, so only your audio is transmitted – clean and free from interference.
Palmer wupper was developed for guitar and bass applications, but its brilliant, uncoloured sound is just as suitable for keyboards and hi-fi equipment. Inputs and outputs via jack sockets can be balanced or unbalanced. This means the Palmer wupper can also be used to balance unbalanced signals, enabling longer cable runs without affecting the sound. Thanks to its passive design, wupper requires neither batteries nor phantom power. This makes it extremely reliable in operation.
Palmer wupper is a simple and effective hum eliminator: connect it between two devices and the interference is gone. Sometimes it can be that simple!
- 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
| Product type | line isolator |
| Channels | 1 |
| Type | passive |
| Transformer isolated | Yes |
| Number of inputs | 1 |
| input type | balanced/ unbalanced |
| Input connectors | 6.3 mm jack |
| Number of outputs | 1 |
| Output type | balanced/ unbalanced |
| Output connectors | 6.3 mm jack |
| Ground lift switch | No |
| Housing | Aluminium continuous casting |
| Dimension (H/W/D) | 50 x 110 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) |
| Accessories (included) | rubber feet |
Audio
| 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 |
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