Douk Audio Mini Stereo Line Level Booster Amplifier Preamp 20dB Gain Volume Control

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 Most of the reviews that say that you have to find your own power supply are completely outdated and should be taken down.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. ⭐️⭐️⭐️⭐️⭐️

今回の商品は、非常に良い中古品との評価だった。少し前に同製品を新品購入したが、不具合があって返品した。中古品として価格が下がり、非常に良いとの評価で出品されていたので購入したものの、送られてきた商品は前回返品した商品そのものであった。製品箱もなく、あり合わせの段ボールの小箱に入れれれていたので、開封した時点ですぐに分かった。箱には数字の「17」がマジック書きされていた。前回のものと全く同様。返品商品を「非常に良い」と評価し、再販するのはいかがなものだろうか、、、？？？

It did the job for Me boosted the signal to almost double the strength only problem is is that it introduces a little bit of white noise, but to be honest, I have an art clean box pro and that was introducing white noise as well, so it might not be this product. It might just be my amplifier regardless of that. I have a wireless RCA transmitter and I put this before the transmitter so the wireless signal completely cut out the white noise if anyone is running into that issue try to go wireless you lose a little bit of signal when you go wireless, but this boostsit right back up anyway anyways

This is a little dynamo. Installed between tv and amp. The improvement to the volume and sound quality is fantastic. I have tried many other similar items for a much higher value and they are nowhere near as good as this.Very happy

I took the plunge on this thanks to the review from coolspot, as I wasn't convinced that weren't cheaper options out there. While I can't speak to the sound quality yet (which I will review at a later point) due to only boosting LFE frequencies, it certainly does the job at boosting the signal. Setup is as follows.Receiver > 10-15' rca cable > Booster > SoundTech ST300CX (crossover unit) > Yorkville A4.4 > Aura AST-2B-4 Pro Bass Shaker.Before, I had to have the dial at about 3-4 o'clock (80% volume) to get a usable signal to the shaker (which is one of the most easy to feed ones out there). Now I just have the pre-amp at 12 o'clock (50%) and the power amp at 9 o'clock (maybe about 25%). So yeah, this is a great win! I have not experimented to see how much loss is caused by the long RCA cable I've been using this whole time, but that's irrelevant to the performance of this little USB powered unit right now. I look forward to testing to see if this has a hard cut off at 20hz, or if it can boost signals lower than that for my Buttkicker.