Douk Audio L1 Mini Stereo Line Level Booster Amplifier Audio Preamp with 20dB Gain and Volume Control
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Availability:
In Stock.
Arrives
Saturday, Oct 17
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.
Description
Seamlessly connects with a variety of audio devices through multiple interfaces, boosting low-level signals for enhanced audio output. Features adjustable gain and a wide voltage range, operating at 26V for ±12.5V output and a maximum 20dB gain, ensuring powerful audio performance. Double-sided PCB with a swappable NE5532P op amp for customizable sound quality, delivering a natural, warm, and distortion-free listening experience. An all-metal, mini design offers both style and protection against electromagnetic interference, suitable for a wide range of audio enhancement needs. Make Hi-Fi Affordable Estabilshed in 2013, Douk Audio & Nobsound is created by a group of enthusiastic music fans and professional audio experts. We design and make various audio equipments including amplifier, phono preamp, headphone amp, DAC, audio switch and so on. Our aim is "Make Hi-Fi Affordable" ! Ampapa Q1 DAC | Bluetooth Headphone Amp Douk Audio G7 Flagship Amplifier Ampapa D1 Bluetooth Amplifier Douk Audio P7 Phono Preamplifier Douk Audio U2 PRO DDC
Manufacturer: Douk Audio
Maximum Supply Voltage: 26 volts_of_direct_current
Minimum Supply Voltage: 26 volts_of_direct_current
Mounting Type: Surface Mount
Brand: Douk Audio
Maximum Supply Voltage: 26 volts_of_direct_current
Minimum Supply Voltage: 26 volts_of_direct_current
Mounting Type: Surface Mount
Number of Channels: 2
Manufacturer: Douk Audio
Model: XZ-L1
Brand Name: Douk Audio
Number of Items: 1
Unit Count: 1 Count
Number of Packs: 1
Part Number: XZ-L1
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Saturday, Oct 17
Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
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Top Amazon Reviews
DOUK LI AUDIO BOOSTER: NEAT GADGET! I have a very nice, $600-ish Denon turntable with a good cartridge and quality built-in preamp. Since an upgrade to an elliptical stylus, the tracking and sound ed even further, but the volume was rather insufficient through my mid-power receiver (integrated amplifier plus tuner), particularly on softer recordings. The phonograph output simply wasn't comparable to that of the other components. I wanted to continue using the record player's own preamp due to its RIAA-compliant equalization, but it needed just a mild... boost! Too much of a boost (such as that from a typical phono preamp) would have either introduced distortion or forced the need to bypass the phono's built-in preamp altogether. That would have introduced a whole new set of concerns. // Enter the little "Douk Audio L1 Mini, Stereo Line-Level Level Booster Preamp." It boosts the preamp gain just a hair, no more than 20 dB. There is no tone coloration, no distortion, just the smallest signal boost needed ahead of the receiver. I get bigger, broader, full-range phono sound without the unsafe need to overdrive the amplifier. // Now, the features and limitations: Clean signal boost? Yes. / Flexible usage? Yes, as indicated. / Loss or change of sound quality? No. Only clear, increased volume. No tone controls. / Standalone preamp or amplifier? No, it's simply a preamp booster. / Is it a Bluetooth transmitter or receiver? No, its wired system offers better sound quality than Bluetooth. / Are cables included? Yes, audio cables and power cable are included. It is advertised as not including the power cable, but it does. Just plug it in and use it! / Bulky addition? No, very small and simple to use, but effective. / Expensive? No. For what it does and how well it performs, the price is a steal. // Overall, very nicely done, Douk Audio!
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Reviewed in the United States on August 31, 2026 by Verena and David
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.
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Reviewed in the United States on April 12, 2024 by Chadnic
I purchased this item to use between my componet CD player and a Stereo Tube Power Amplifier. Because my componet Preamplifier is awaiting shipment of a new power switch. I thought this would be a good inturn solution allowing me to still listen to my CDs. The not so good. The unit has a set of RCA inputs and a stereo 3.5mm input jack. The signal chain goes from the RCA jacks through the 3.5mm input jack. Unfortunately the RCA jacks did'n't work on my unit meaning the internal contacts in the jack were not connecting properly. The 3.5mm jack did work and with the proper adapter cable and I was able to get it working in my system. It is a pretty cool little device. I did remove the covers to investigate the problem. I was surprised to see this. It will run from single 5Vdc USB power supply. Inside the unit is a small power inverter that takes that 5Vdc and generates a +/- 12Vdc isolated power supply to power the NE5532 Dual OpAmp. It provides 20 db of gain ( voltage gain of 10). It has a slight rolloff of -3db @40Hz which is not quite ideal. Otherwise the unit has excellent fidelity and for my purpose it works fine.
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Reviewed in the United States on December 24, 2024 by James E Grissom
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.
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Reviewed in the United States on October 27, 2025 by Glenn C. Harrison
Work fine but only lasted about a year and now all I hear is a hum sound. Tried switching out cables and jacks but it didn’t help.
Reviewed in the United States on November 10, 2023 by Rob of Amazon
3 minute setup- works great. Exactly what was needed to improve quality volume on existing system at low cost.
Reviewed in the United States on September 21, 2026 by Ed R.
First connected with RCA cables. Load pulsing hum. Used 3.5 m connector and made separate chassis GND cable to main stereo preamplifier . Humming stopped. Works fine now.
Reviewed in the United States on June 23, 2025 by B. Madigan
Ignore all the reviews that says that this device requires a separate USB power source from a phone charger etc… these newer units are shipping out with their own DC power that plugs directly into an outlet. Most of the reviews that say that you have to find your own power supply are completely outdated and should be taken down. It’s truly misleading to a lot of potential buyers in 2026. You can also ignore the reviews that say that the unit doesn’t have proper markings to tell you where the gain or volume is. Take a look at my pictures and you’ll see that the updated models come with their own power supply and proper markings so you can perfectly dial in your volume/gain. I needed this unit to boost the signal on my Buttkicker BKA-1000N amplifier in order increase the power going to my Buttkicker LFE that I installed in my couch. The factory signal or voltage from my “subwoofer out” port is naturally too weak to send a strong enough signal to the to the Buttkicker BKA-1000N Class D amplifier. Even when the amplifier is maxed out, I would have to significantly increase my volume in order to start feeling the vibrations from the buttkicker LFE. Now that I added the Douk Audio line level booster 🗣️THAT PROBLEM IS SOLVED!!! I was very nervous that it will introduce a hum or buzzing noise like some other reviews have stated, but I could gladly say that this unit caused no issues in my home theater system. It simply did exactly what it was advertised to do. IT WILL BOOST any weak RCA line level signal to the proper volume or power level that you are looking for. All the people that made complaints about the older version of the Douk Audio line L1 should definitely consider purchasing the newer model of this unit. It’s definitely worth $40 bucks You can’t beat that price and it doesn’t feel cheap at all.. It’s made out of all metal and feels extremely solid. The knob feels well dampened and turns smoothly. If this device was manufactured from a well-known brand, it would have cost at least $100-$200. I would give this device 10 stars if I could. All the negative reviews are from people that purchased the old models OR they don’t know how to use the device properly. Douk Audio listened to their customers and made this new model flawless. I’m just not sure why THE COMPANY IS NOT ADVERTISING THE NEW FEATURES OF THE UPDATED MODEL. I would give this device 10 stars if I could. Excellent device, excellent sound, excellent build quality, and excellent price. ⭐️⭐️⭐️⭐️⭐️
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Reviewed in the United States on January 25, 2026 by KERB DEJOIE