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Kopul LT-PDI2 Laptop One-Channel Passive Direct Box

BH #KOLTPDI2 • MFR #LT-PDI2
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Kopul LT-PDI2 Laptop One-Channel Passive Direct Box
Key Features
  • Compact Passive Direct Box
  • For Laptops, Tablets, and Smartphones
  • 3.5mm to Balanced XLR Conversion
  • No Power or Batteries Required
The Kopul LT-PDI2 is a compact, passive direct box designed to connect laptops, tablets, and smartphones to professional audio systems. It converts an unbalanced 3.5mm line-level signal into a balanced mic-level mono signal, making it ideal for playback, presentations, and mobile performance without requiring external power.
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Kopul LT-PDI2 Overview

The Kopul LT-PDI2 is a compact, passive direct box designed to connect laptops, tablets, and smartphones to professional audio systems. It converts an unbalanced 3.5mm line-level signal into a balanced mic-level mono signal, making it ideal for playback, presentations, and mobile performance without requiring external power.

Passive Direct Box Operation
The LT-PDI2 requires no batteries or power supply, quietly converting unbalanced line-level stereo signals from consumer devices into balanced mic-level mono signals compatible with mixers, recorders, and PA systems.
3.5mm to XLR Output
The unit sports a 4.7' cable with a built-in 3.5mm TRS input that connects directly to laptops and mobile devices, while the balanced 3-pin XLR output delivers clean, interference-resistant audio to professional equipment, even over long cable runs.
Output Level Control
An adjustable output volume control allows precise level matching when sending audio to a mixing console, sound card, or recorder.
Ground Lift and Mute Switch
The ground-lift switch helps eliminate hum caused by ground loops, while the mute switch provides instant audio cutoff for announcements, breaks, or transitions during events.
Compact Metal Enclosure
Housed in a durable aluminum alloy case, the LT-PDI2 is built for reliable use onstage, in the studio, or on the road. Its compact size allows it to travel anywhere in a gear bag, instrument case, or pocket.
UPC: 847628529236

Kopul LT-PDI2 Specs

General
Item Type
Standard DI
Number of Channels
Single-Channel
Active/Passive
Passive
Circuitry
Solid-State
Preamp
Pad
No
Ground Lift
Yes
Polarity Reverse
No
Gain/Trim Range
-20 to +0 dB
EQ & Tone Shaping
Low-Cut/High-Pass Filter
No
Connectivity
Audio I/O
1x 1/8" / 3.5 mm TRS Unbalanced Line Input
1x XLR 3-Pin Balanced Mic Output
Merge/Summing
Summed-Mono Output Only
Performance
Frequency Response
50 Hz to 20 kHz ±0.5 dB
Total Harmonic Distortion/Noise
0.02%
Power
Operating Voltage
No Power Required
Physical
Dimensions
4.4 x 1.3 x 1" / 11.2 x 3.2 x 2.5 cm
Weight
5 oz / 142 g
Packaging Info
Package Weight
0.405 lb
Box Dimensions (LxWxH)
6.3 x 5.1 x 1.4"

Kopul LT-PDI2 Reviews

Kopal one channel passive direct box for the win!

By Joel
Rated 5 out of 5
Date: 2026-05-12

I’ve been using the Kopal one-channel laptop direct box for a while now, and it’s been super reliable. The 1/8" to XLR connection works cleanly with my setup, and the audio comes through clear without unwanted noise or hum. It’s simple to use, lightweight, and makes connecting a laptop to a mixer or PA system really easy. Definitely a solid little DI box for live sound or events. Things I like are I can plug into a XLR channel directly without a XLR cable be it with a little less length to my laptop or source but in a pinch it’s a nice option. Has a volume knob, ground/lift switch , and a mute button that can be used when multiple operators are on show when you want to do some edits quickly without risking the A1 might have left the channel I’m working on open. All in all a great addition to anyone’s travel pack I’m going to pick up 1 more unit to be prepared. [I have received this product in exchange for my honest review.]

Works just as advertised and is very handy

By Jim
Rated 5 out of 5
Date: 2026-03-07

I have been using this Kopul LT-PDI2 when connecting laptops and mobile devices to mixers, external recorders and sound systems, and it has been a very useful little piece of gear. Sometimes you need a quick way to get audio from a phone, tablet, or laptop into a professional audio setup, and this direct box makes that process simple and reliable. And in my opinion, it sounds great. One of the things I like most about it is that it is completely passive. There are no batteries or power supplies to worry about, which makes it very easy to keep in a bag and use whenever you need it. You simply plug the 3.5mm cable into your device and run the XLR output to a mixer or recorder. In my experience the balanced output helps keep the signal clean, especially over longer cable runs. The build quality is also very solid. The metal enclosure feels durable and ready for regular use on stage or on location. I also appreciate the adjustable output level, which helps dial in the right signal going into a mixer. The ground lift switch is helpful if you run into hum issues, and the mute switch is a nice touch when you need to quickly silence the signal. This is a very practical accessory to have on hand. It is compact, well built, and solves a common problem when connecting consumer devices to professional audio gear. I'm very happy with it. [I have received this product in exchange for my honest review.]

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