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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Brenda
Whiting, US
★★★★★ 5
Several uses
Size: 4 Pack
I bought these not to use for baby food. Actually I used it because they’re 4 ounces and they’re easy to use for several types of different things. I initially got it for my yogurt that I make it home cause I wanted it to be exactly a half a cup and 4 ounces is a half a cup so these are perfect for that but I recently was using it also to hold some coconut oil in it so I’m thinking you probably could put almost anything in it and of course baby food too I’m sure but I did not use it for baby food. I used it for other stuff and it’s just a great product. They seal really well. The price was pretty good. They can go in the dishwasher. They freeze real good so it’s a good product.
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Reviewed in the United States on August 8, 2025
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Joanna
Cuba, US
★★★★★ 5
Love these containers!
Size: 4 Pack, Size: 4 Pack
Just like the photos!
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Reviewed in the United States on May 23, 2026
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Roni
Louisville, US
★★★★★ 5
Cute!
Size: 4 Pack
Pretty good! Closed and open just fine. They wash well and dry fast. Enough room to add what's needed. Easy for adults to open but kids will need help. Color is just like the picture shown! Overall I like them so far!
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Reviewed in the United States on October 5, 2025
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Closet Treasures
Cuba, US
★★★★★ 4
Containers
Size: 4 Pack
Great storage option for the the little ones.
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Reviewed in the United States on October 19, 2025
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Iryna
Natrona Heights, US
★★★★★ 5
Perfect
Size: 4 Pack
Very nice
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Reviewed in the United States on May 23, 2026

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