---
product_id: 243819127
title: "Douk Audio L1"
brand: "douk audio"
price: "€ 83.99"
currency: EUR
in_stock: null
reviews_count: 9
category: "Douk Audio"
url: https://www.desertcart.fi/products/243819127-douk-audio-l1
store_origin: FI
region: Finland
---

# 20dB adjustable gain boost Multi-input/output versatility All-metal EMI shielding Douk Audio L1

**Brand:** douk audio
**Price:** € 83.99
**Availability:** ❌ Out of Stock

## Summary

> 🎧 Elevate Every Note — Amplify Your Audio Experience!

## Quick Answers

- **What is this?** Douk Audio L1 by douk audio
- **How much does it cost?** € 83.99 with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.fi](https://www.desertcart.fi/products/243819127-douk-audio-l1)

## Best For

- douk audio enthusiasts

## Why This Product

- Trusted douk audio brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Versatile Use Cases:** Perfect for home stereo, mixers, karaoke, live events, and office setups—turn any audio system into a powerhouse.
- • **Audiophile DIY Ready:** Swap NE5532P op amps effortlessly with pluggable sockets to customize your sound signature and enjoy premium HiFi clarity.
- • **Compact & Durable Design:** Sleek mini size with robust all-metal casing ensures durability and effective electromagnetic interference shielding.
- • **Powerful Signal Amplification:** Boost your audio line signal up to 20dB with adjustable gain and a high 26V output voltage for crystal-clear sound.
- • **Universal Audio Compatibility:** Seamlessly connects with iPods, TVs, gaming consoles & more via 3.5mm AUX, RCA, and 5-DIN inputs/outputs.

## Overview

The Douk Audio L1 is a compact, high-performance stereo line level booster amplifier featuring multiple input/output options, adjustable 20dB gain, and a robust 26V power supply. Designed with audiophiles in mind, it offers a unique pluggable op amp socket for sound customization, all housed in a durable metal chassis that minimizes interference. Ideal for enhancing audio clarity and volume across diverse devices and environments, it’s a must-have for professionals seeking premium sound amplification with DIY flexibility.

## Description

Buy Douk Audio L1 Mini Stereo Line Level Booster Amplifier Audio Preamp with 20dB Gain and Volume Control: Amplifiers - desertcart.com ✓ FREE DELIVERY possible on eligible purchases

Review: How to get this to work great with Pro Tips! - This product does exactly what it says it does, it will boost your audio line signal by around 20 decibels. My own measurement put this at 17.2 DB louder from 15 feet away before you start to get distortion. It can go up to around 19 DB or so but you get distortion. Even 15 db is plenty to make a stock stereo in a car really loud, but be warned you won't be pumping mass bass as the power output isn't there to drive your Fosgate 12s for example, obviously anyone installing quality equipment like that won't be using this thing. The product is cheap and has multiple inputs and outputs available (see pro tips below). It also comes with a USB-A power cable so you'll need a USB-A port available or otherwise supply your own power. Many of the complaints about this product seem to be curable but do require extra work and or parts. Pro Tips on how to get this to work great: 1. Take into account where you will be installing this. If you are installing this around unshielded cable, high voltage etc, because of its cheap nature, it will pick up a hum, this thing is not insulated at all really. It is best to keep it away from other devices and power it cleanly off a dedicated USB or power supply. See below for ideas how to fix if you get a hum. 2. The 3.5MM input will be priority and no other inputs will work at the same time if you use the 3.5MM input, however, if you use RCAs and the 5-Din this thing will take in both and mix them evenly (There is no way to to mix or boost one more than the other). The output is both 5-Din and RCA, you can use either or both at the same time. 3. Since this thing isn't driving that much power, I found even the cheapest cables work fine. Normally you want to use higher quality cables for the best sound with the least leakage but in this case we are going cheap, so even cheap cables will work. 4. If you are installing this in a car, you're probably like me and installing it on an old or stock in-dash stereo and those are horrible for grounding and will usually pick up a hum because of ground issues so here is: How to fix the dreaded hum that people complain about: First, you can try to ground your stereo better if you can. This can help, but if you are just hoping to plug it in and not mess around try a Ground Loop Isolator like this: https://www.desertcart.com/dp/B06XQYN77L?psc=1&ref=ppx_yo2ov_dt_b_product_details The linked isolator uses the 3.5MM input on the amp and takes in a 3.5MM connection. An over simplified explanation is that by using an inductor that then creates a magnetic field, a ground loop isolator can essentially force any differences in current (caused by a bad or different resistance ground) to be nullified because this is what causes the hum. Please realize you'll need to get the correct kind of isolator for your inputs and outputs. Just search Ground Loop Isolator here on desertcart and you'll find many. Since this isn't putting out that much power, cheap ones usually do the trick. Also keep in mind that there are two schools of thought and which one works for you depends on your situation: 1. Place the isolator between the head unit (a stereo for example) and the amp. In other words place the isolator on the input side of this amp. This is the typical way of doing things and works for the vast majority of cases in car audio although not all. 2. Place the isolator after the amp but right before the speakers if there are other components in the system like a game console, or another stereo component etc. This case is more specialized but you can pick up hum caused by the amplifier itself and it bleeds on the output side but this is less likely. The amp usually get's hum fed into it and you can eliminate that on the input side and the amp will output a clean signal. 3. Place an isolator on the input AND the output side. This is really rare and only happens in extreme instances where there are a lot of electronics at play causing problems for one another OR there are powered devices after the amp that are picking up hum from the combination of sources. In this case you'd add one on the input side as close to the amp as possible, and then one on the output side as close the speakers as possible. Good luck! This thing is a steal at the price for what you can do with it using a little know how.
Review: Has Done An Excellent Job EVERY DAY For The Last 2.5 Years - Has Done An Excellent Job EVERY DAY For The Last 2.5 Years For My Office Stereo Setup With ZERO Problems. I use it just about everyday. For the last 15 years I've had The Logitech Z623 2.1 THX 330watts RMS System with Two 3'' Satellite Speakers and a 7'' Subwoofer that everyone swears is a 10" Sub, it's really impressive and would recommend it to anyone. I can hear it booming and pounding hard clear across the street but that's a whole different story. I just purchased a brand new LOGI Z623 about 6 months ago as the Subwoofer finally started to go out. I also have a Sound Bar above my monitor mounted to the wall. I had to split the Audio with and a 3.5mm Audio Splitter so the audio signal reaching each of the Speaker Setups which are The Logitech System and The Sound Bar, the audio signal is cut in half by the time it reaches them. This reduces or cuts the overall volume signal to each audio component by 50%. Everything was still nice and loud for the most part but the volume would frequently be at 100% to listen to my music which i listen to loudly. Many times it just wasn't enough though, i needed more- It was "almost but no quite" so I bought this Signal Amplifier and WOW! what a difference it made. My System is Super Loud Now. Louder than it ever has been. I'm getting every last bit of audio sound i want and then there's dump truck load more behind it - i just make sure to not turn it up too loud bc I could blow all of these speakers very easily and quickly. I never turn my system up to 100% bc i'd destroy it with this Singnal Amplifier and remember, My Audio Signal is already cut in half so this thing Amps the signal EXTREMELY WELL. The PreAmp Signal Booster has been doing a great job day in and day out. Sound Quality is great too. It's just nice to have all the sound i want when i want it. This is one of those purchases that i don't think about very often bc it's tucked away but when i think about it - it's one of the best purchases i've ever made. It's made in China so you never know what you're going to get but going on 3 years of nearly daily use and i would even say punishment bc i push it hard and it's held up well. So yeah, i'd recommend this as it's built well and built to last. It has a sturdy and solid construction.

## Features

- Mutiple input/output interfaces: with 3.5mm AUX/stereo RCA/5-DIN inputs and stereo RCA/5-DIN outputs, can be compatible with most low-volume audio sources such as ipod, ipad, phone, TV, MP3 player, potable CD player, computer, video game etc., and boost their output to the level needed to drive amplifier or speakers.
- With built-in amplification and voltage boost circuit: adjustable gain to match better with different audio sources, support DC 5-24V wide input voltage that can share the power supply of amplifiers, while L1 can always work at a high voltage of 26V to provide ±12.5V high output amplitude and max 20dB high gain.
- Unique design and HiFi clear sound: double-side PCB design, NE5532P op amp with pluggable socket design, convenient to change other op amps to enjoy different sound and bring much DIY fun for audiophiles. High-qaulity sealed potentiometer, with wide frequency bandwidth and excellent dynamic response, the sound is smooth and natural, warm and delicate with ultra-low distortion.
- Mini size with exquisite appearance, compact and all-metal design for durability and shielding the electronics from electromagnetic interference with noise rejection. Perfect design in size and function, suitable for many scenarios to increase the output level, such as home stereo system, mixer or speaker setup, karaoke, audio recording, party, live stage event etc.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B08L4WYSZ4 |
| Best Sellers Rank | #30,350 in Electronics ( See Top 100 in Electronics ) #162 in Audio Component Amplifiers |
| Brand | Douk Audio |
| Date First Available | October 13, 2020 |
| Item Weight | 14.1 ounces |
| Item model number | XZ-L1 |
| Manufacturer | Douk Audio |
| Maximum Supply Voltage | 26 Volts (DC) |
| Minimum Supply Voltage | 26 Volts (DC) |
| Mounting Type | Surface Mount |
| Number of Channels | 2 |
| Output Power | 12.5 Volts |
| Package Dimensions | 5.71 x 4.29 x 3.43 inches |

## Product Details

- **Brand:** Douk Audio
- **Manufacturer:** Douk Audio
- **Maximum Supply Voltage:** 26 Volts (DC)
- **Minimum Supply Voltage:** 26 Volts (DC)
- **Mounting Type:** Surface Mount

## Images

![Douk Audio L1 - Image 1](https://m.media-amazon.com/images/I/71NwGrVGHtL.jpg)

## Questions & Answers

**Q: My unit has stopped working. Mini input jack may be bad. How do I return for replacement? purchased 9/2/22**
A: Try a new supply for cable to usb ie another high power charger.

**Q: Can this amplify a video signal to allow splitting on multiple viewing screens ?**
A: No.  It is for audio only (and in my opinion, doesn't even do that well).

You need a device that is specifically for video, like this:
https://www.amazon.com/MT-VIKI-Splitter-Composite-Distribution-Amplifier/dp/B0882RHYTW/
This will take a composite video input, amplify it, and provide multiple outputs.  It also does the same for the associated audio inputs.

**Q: What are the exact dimensions of the power connector? The connector has 2 dimensions, the outer diameter and the inner pin diameter (5.5 mm x?)**
A: I don't know.  My Mini Stereo Line Level Amp stopped working the second week I owned it.  I recommend buying something else.

**Q: Will it give a full 2 volt line out  RCA signal**
A: So long as the input level is sufficient to create a 2V output signal, the answer is yes.  If the input signal is not of sufficient amplitude it will/can not.

## Customer Reviews

### ⭐⭐⭐⭐⭐ How to get this to work great with Pro Tips!
*by C***C on April 12, 2024*

This product does exactly what it says it does, it will boost your audio line signal by around 20 decibels. My own measurement put this at 17.2 DB louder from 15 feet away before you start to get distortion. It can go up to around 19 DB or so but you get distortion. Even 15 db is plenty to make a stock stereo in a car really loud, but be warned you won't be pumping mass bass as the power output isn't there to drive your Fosgate 12s for example, obviously anyone installing quality equipment like that won't be using this thing. The product is cheap and has multiple inputs and outputs available (see pro tips below). It also comes with a USB-A power cable so you'll need a USB-A port available or otherwise supply your own power. Many of the complaints about this product seem to be curable but do require extra work and or parts. Pro Tips on how to get this to work great: 1. Take into account where you will be installing this. If you are installing this around unshielded cable, high voltage etc, because of its cheap nature, it will pick up a hum, this thing is not insulated at all really. It is best to keep it away from other devices and power it cleanly off a dedicated USB or power supply. See below for ideas how to fix if you get a hum. 2. The 3.5MM input will be priority and no other inputs will work at the same time if you use the 3.5MM input, however, if you use RCAs and the 5-Din this thing will take in both and mix them evenly (There is no way to to mix or boost one more than the other). The output is both 5-Din and RCA, you can use either or both at the same time. 3. Since this thing isn't driving that much power, I found even the cheapest cables work fine. Normally you want to use higher quality cables for the best sound with the least leakage but in this case we are going cheap, so even cheap cables will work. 4. If you are installing this in a car, you're probably like me and installing it on an old or stock in-dash stereo and those are horrible for grounding and will usually pick up a hum because of ground issues so here is: How to fix the dreaded hum that people complain about: First, you can try to ground your stereo better if you can. This can help, but if you are just hoping to plug it in and not mess around try a Ground Loop Isolator like this: https://www.amazon.com/dp/B06XQYN77L?psc=1&ref=ppx_yo2ov_dt_b_product_details The linked isolator uses the 3.5MM input on the amp and takes in a 3.5MM connection. An over simplified explanation is that by using an inductor that then creates a magnetic field, a ground loop isolator can essentially force any differences in current (caused by a bad or different resistance ground) to be nullified because this is what causes the hum. Please realize you'll need to get the correct kind of isolator for your inputs and outputs. Just search Ground Loop Isolator here on amazon and you'll find many. Since this isn't putting out that much power, cheap ones usually do the trick. Also keep in mind that there are two schools of thought and which one works for you depends on your situation: 1. Place the isolator between the head unit (a stereo for example) and the amp. In other words place the isolator on the input side of this amp. This is the typical way of doing things and works for the vast majority of cases in car audio although not all. 2. Place the isolator after the amp but right before the speakers if there are other components in the system like a game console, or another stereo component etc. This case is more specialized but you can pick up hum caused by the amplifier itself and it bleeds on the output side but this is less likely. The amp usually get's hum fed into it and you can eliminate that on the input side and the amp will output a clean signal. 3. Place an isolator on the input AND the output side. This is really rare and only happens in extreme instances where there are a lot of electronics at play causing problems for one another OR there are powered devices after the amp that are picking up hum from the combination of sources. In this case you'd add one on the input side as close to the amp as possible, and then one on the output side as close the speakers as possible. Good luck! This thing is a steal at the price for what you can do with it using a little know how.

### ⭐⭐⭐⭐⭐ Has Done An Excellent Job EVERY DAY For The Last 2.5 Years
*by G***N on October 27, 2025*

Has Done An Excellent Job EVERY DAY For The Last 2.5 Years For My Office Stereo Setup With ZERO Problems. I use it just about everyday. For the last 15 years I've had The Logitech Z623 2.1 THX 330watts RMS System with Two 3'' Satellite Speakers and a 7'' Subwoofer that everyone swears is a 10" Sub, it's really impressive and would recommend it to anyone. I can hear it booming and pounding hard clear across the street but that's a whole different story. I just purchased a brand new LOGI Z623 about 6 months ago as the Subwoofer finally started to go out. I also have a Sound Bar above my monitor mounted to the wall. I had to split the Audio with and a 3.5mm Audio Splitter so the audio signal reaching each of the Speaker Setups which are The Logitech System and The Sound Bar, the audio signal is cut in half by the time it reaches them. This reduces or cuts the overall volume signal to each audio component by 50%. Everything was still nice and loud for the most part but the volume would frequently be at 100% to listen to my music which i listen to loudly. Many times it just wasn't enough though, i needed more- It was "almost but no quite" so I bought this Signal Amplifier and WOW! what a difference it made. My System is Super Loud Now. Louder than it ever has been. I'm getting every last bit of audio sound i want and then there's dump truck load more behind it - i just make sure to not turn it up too loud bc I could blow all of these speakers very easily and quickly. I never turn my system up to 100% bc i'd destroy it with this Singnal Amplifier and remember, My Audio Signal is already cut in half so this thing Amps the signal EXTREMELY WELL. The PreAmp Signal Booster has been doing a great job day in and day out. Sound Quality is great too. It's just nice to have all the sound i want when i want it. This is one of those purchases that i don't think about very often bc it's tucked away but when i think about it - it's one of the best purchases i've ever made. It's made in China so you never know what you're going to get but going on 3 years of nearly daily use and i would even say punishment bc i push it hard and it's held up well. So yeah, i'd recommend this as it's built well and built to last. It has a sturdy and solid construction.

### ⭐⭐⭐⭐ Use a good quality USB power source!
*by W***. on May 21, 2025*

I was initially disappointed with the hum and interference from this device, but when I swapped from using the built-in USB ports on a power strip to a high-quality USB phone charger, the unwanted noice disappeared. Provides just the extra little oomph I needed in front of my tube amp for my small audio system. I'm only using it turned up about 25%

## Frequently Bought Together

- Douk Audio L1 Mini Stereo Line Level Booster Amplifier Audio Preamp with 20dB Gain and Volume Control
- Monoprice 1.5ft Premium 2 RCA Plug/2 RCA Plug M/M 22AWG Cable - Black
- AtNeDcVh Mini Small Stereo Audio preamplifier, Headphone Amplifier, Gain 20dB Phono Turntable Phonograph preamp, Dual op amp NE5532 with RCA 3.5mm Input to RCA 3.5mm Output

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*Product available on Desertcart Finland*
*Store origin: FI*
*Last updated: 2026-03-10*