Palmer PWUPPER Passive Line Isolation Box
SKU: 77304701751

Palmer PWUPPER Passive Line Isolation Box

Sale price$156.59 Regular price$173.99
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Description

Palmer PWUPPER Passive Line Isolation Boxhe 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

he 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!

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

Specifications

General
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
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
Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 77304701751

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4.5 ★★★★★
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Richard Klementovich
Massapequa, US
★★★★★ 1
Cheaply Made
Not worth the money it costs imo
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 14, 2026
G
Verified Purchase
Geo L.
Waukegan, US
★★★★★ 5
Excellent durability for daily wear
Color: Gold Paperclip
I bought these earrings a year ago and I've been wearing them ever since! I never take them off because they are so comfortable. They never come unlatched and they are very durable. They look great and I love how they have some movement because of the two loops hooked together. For me the size is perfect, but you can always remove the dangling hoop to decrease the weight and create a smaller look. Even with booth hoops installed, they are so light that I cannot feel them in my ears. They would make a lovely gift because they look more expensive than the price I paid.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on October 8, 2025
A
Verified Purchase
Alvee
Whiting, US
★★★★★ 5
Good quality
Lovely earrings. A little smaller than I expected but Going to keep them. A reasonable purchase. Lightweight and clasp a little tight but better than loose.
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Reviewed in the United States on June 2, 2024
L
Verified Purchase
LaToyia Taylor
Fort Morgan, US
★★★★★ 3
Cute but small
Color: Gold Paperclip
These are cute but they are smaller than I thought they would be. The only thing I did not like was that they kept coming apart. The two links would unhook and one hook would fall off. I squeezed them a little tighter and that helped.
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Reviewed in the United States on August 17, 2024
C
Verified Purchase
Carolanne
Natrona Heights, US
★★★★★ 5
Nice fit
I love these. A good fit for every day use.
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Reviewed in the United States on December 28, 2025

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