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Douk Audio

Douk Audio Balanced EQ Preamp: 7-Band Equalizer - Vacuum Tube Preamplifier with XLR RCA Inputs & Outputs - for Home Stereo HiFi System, Amplifiers, Active Speakers (T8 PRO Silver)

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Availability: In Stock.
Fulfilled by Amazon
Arrives Friday, Oct 16
Order within 23 hours and 59 minutes
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Features

  • Professional 7-band equalizer (50Hz-16KHz) precisely adjusts highs/mids/lows to compensate speaker defects & optimize any sound source, delivering custom audiophile-grade acoustic profiles.
  • Dual XLR/RCA inputs & outputs with balanced signal transmission eliminate interference noise, while independent channel balance control ensures accurate stereo imaging.
  • Upgradable 6H1N-BN vacuum tubes generate warm HiFi analog sound signature; pluggable sockets support ECC85/6SN7GT tubes for personalized timbre sculpting.
  • CH1/CH2 input switching & simultaneous RCA/XLR output modes enable flexible connectivity with amplifiers/active speakers, simplifying studio-grade setups.
  • Compact aluminum chassis with EMI-shielding iron plate fits desktops seamlessly, featuring vintage tube glow for both aesthetic appeal and noise-free performance.

Description

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 50Hz-16KHz Equalizer | Vacuum Tube Preamplifier | XLR Blanced Input & Output | 2-Way Audio Switch | Compact Design Refine speaker performance and modify any audio sources and compensate channel imbalances. Delivers noise-free signal transmission with enhanced separation for pristine sound reproduction. Can be changed to the following models: 6N1/6AQ8. 6SN7GT requires a 6SN7 to 6N1 socket adapter. Instantly toggle between CH1 and CH2 sources. Two outputs (RCA+XLR) can work at the same time. Boosts signal integrity and refines tonality before amplification, revealing hidden details. Minimizing coloration for critical near-field monitoring. What does this device do? T8 can compensate for the defects of speakers and sound field by adjusting 7-band high, middle and low frequencies, and modify various sound sources. The timbre and loudness also can be changed to achieve different sound effects. Can I use RCA and XLR outputs simultaneously? Yes! Both outputs work concurrently - connect XLR to studio monitors and RCA to a subwoofer simultaneously. Ideal for multi-amp setups without signal degradation. Perfect for A/B testing or expanding your audio chain. How do I reset EQ frequencies to neutral? Rotate any band's knob until you feel a tactile pause at the center position (scale line vertical). This zero point means no boost/cut applied. Reset all knobs to center for flat reference response. What tubes can I upgrade to? Stock 6H1N-BN tubes support direct swaps with 6N1/6AQ8/ECC85. For 6SN7GT tubes, you MUST use a 6SN7-to-6N1 adapter (not included). Adapter ensures proper pin alignment and voltage safety.

Item Weight: 1.51 pounds


Product Dimensions: 5.04 x 7.32 x 1.5 inches


Item model number: SUC-T8-PRO-S


Date First Available: August 30, 2023


Color Name: Silver


Compatible Devices: Active Speakers, Amplifier, CD Player, PC, TV


Connector Type: RCA, XLR


Material Type: Metal


Power Source: Corded Electric


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Friday, Oct 16

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.

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Top Amazon Reviews

    • Fantastic EQ with well thought out center frequencies
Review Image by Kevbasskeys
I cannot say enough good things about this awesome tube EQ. First of all, I love the frequency centers - I wouldn't have minded if the 50Hz band was a little lower, say 40Hz or even 30Hz for those of us that have subs (the Schiit Lokius's lowest band starts at 20Hz), however the rest of the frequencies are fantastically placed, at key areas that often need to be adjusted (such as 16kHz, 120Hz, I also find 315Hz to be really useful). The knobs feel fantastic, with a grippy non slip surface & pots that have just the right amount of resistance and are tight with no slop. The volume knob also has detents every 5-10 degrees or so which feels great & the balance adjustment is also a welcome addition. Having never owned a tube pre before, I wasn't sure what to expect in regard to sound quality. For the most part, I found the tubes to sound adequate for the price, however I was able to get a better sound replacing the tubes with this pair that was recommended by another reviewer: https://www.amazon.com/dp/B08QG4ZC1V These tubes give a really open quality to the midrange & overall presentation, however so far both the stock tubes & these (unless it's an issue with the unit itself) have a side effect of rolling off the lowest octave of sub bass which is my only issue with this EQ. However, it isn't really noticeable on most speakers/headphones unless you have a sub that hits really low. Highly recommended! ... show more
Reviewed in the United States on February 19, 2025 by Kevbasskeys
    • A solid 4.5 star rating
Review Image by J G
I purchased this eq almost 2 years ago but had yet to hook it up until this past weekend. I am using it with balanced connections coming out of my Topping DAC and going into my Yamaha A-S501 amplifier. I decided to replace the stock tubes with some GE 5814A military grade tubes that I had laying around. The sound is very robust and the high end really gives my normally warm AR 2ax speakers a nice sparkle. I have the rest of the eq basically set flat. It doesn't take much tweaking to load up on the bass and mid section so I left them alone as they were already good to go. It did seem to give the mids a little more texture. Overall it's a nice little add on that is compact and does not introduce any noise in the chain. I'm glad I remembered I had purchased it and now after almost 2 years will put it to work. ... show more
Reviewed in the United States on July 6, 2026 by J G
    • un happily not for me
Did not work for my situation. nothing wrong with the amp.
Reviewed in the United States on October 5, 2026 by PeggySetter
    • Does what it's supposed to do
I have a "modern" high-end receiver, which basically takes all of the controls away - lacking even a treble and bass adjustment in favor of it's own built-in modes. Well, anyway, oftentimes I really want and need more treble or bass - and here it is! Update: I've had this unit for over a month now and I am even MORE pleased than before. The equalization can make my high-end Pioneer receiver sound near perfect, even with the CD itself is poorly equalized in the mix! I use "Line" input into the Power amp stage so now I can tone-down or tone-up one or more bands of the poorly mixed CDs - something NO poweramp can do. I also like the "organic" tubyness" of the unit. It makes vocals sound very real. I do keep the gain (volume) at about 10:00 so as not to overdo the influence of the tubes, and also give them plenty of headroom to do their job. I'm reporting back again after about a year of use of my first of 2! units. I've been experimenting improving the quality of the sound - even as it was quite good to begin-with, I found it a little too "trebley" and harsh at the top end. I first tried using some top-quality Russian-made 6H1N-BN tubes, and that did indeed improve the sound a little (note again it was good to begin with). Then I tried some top-quality 12AU7 tubes - but no, that was not better. Then I took a leap of faith and tried two 12BH7-A tubes. And those were really wonderful. I used these tubes for months, and had absolutely no complaints. But I was reading about JJ ECC99 which made them seem another possibility... and decided to give them a try. Now _these_ are my favorites! The quality of the sound with JJ ECC99 tubes is simply amazing. I usually keep the "volume/gain" at one click above 9 o'clock, and that is what works best for me. ... show more
Reviewed in the United States on May 20, 2024 by Tom Grzybowski
    • Looks, feels and reproduces music like a quality built piece of gear should!
I bought this in HiYO Silver(!) to use with my heaphone setup here in the Bat-Cave. It is excellent in doing what it says it does and that being allowing me to tailor the music I bought and paid for so that I can hear as I want and not just as so much fAdCopy today claims, "...as the fArteeest intended". The artist intended for you to buy and enjoy their music and this excellent performing (and looking!) EQ does just that. I use it with an Emotiva XDA-2, an S.M.S.L. smurtified THX headphone amp w/balanced and SE in/ouputs and a WONDERFUL Denon HEOS Link for my paid for music services: Pandora, SiriusXM and Amazon UHD Music. They all sound wonderful through this setup and It works superbly across the 5 'phones that to date I have used with it. You will not be disappointed. Well...Unless you enjoy straining to hear bits instead of music. I can't hear a single "bit", 0, 1 or otherwise. What I am hearing is MY soundtrack, beautifully reproduced and tailored to MY tastes by a compact, well built and good looking piece of audio equipment. I may get one for a relative for his headphone use. It is that good! Trust me. I know what I'm doin' when I'm reviewin'. Thanks! TheBatman ... show more
Reviewed in the United States on April 19, 2024 by The Batman
    • A decent EQ…with tubes, no less!
What we have here is basically a fun and functional device. The tubes are cool, but they are mostly for show. But what a show! The EQ is very functional and will definitely help you dial in more sparkle or thump, depending on how you set. It’s best when used for a little tweak here or there. Overall, I am pleased with my purchase. Tube rolling is fun! ... show more
Reviewed in the United States on March 5, 2025 by W. P.
    • Great preamp for a very reasonable price
This preamp/EQ is really good, especially for the price. I'm a bit of an audio snob, but I can say that this preamp sounds great, no unwanted noise and gives you the ability to adjust the sound with the EQ. I've tried a few different tubes, not much of a difference but nice to have the option. If you need a preamp with the added tone adjustments and want to add a bit of warmth to your system, this unit is a great low cost option. ... show more
Reviewed in the United States on November 25, 2025 by Demetrios
    • disliked it very much.
If noisy distorted sound is what you are after that this might be for you. I used a bunch of inexpensive Chinese units with mixed results and occasional gem to be found. This one is not it. Looks like I received open box or customer return unit as box was not sealed and no user manual inside. I needed such unit and now have to find something like that again. disappointed. ... show more
Reviewed in the United States on February 22, 2026 by Family Account

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