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Douk Audio T7 7-Band Equalizer Balanced XLR / RCA Preamp Review

A desktop 7-band stereo equalizer and preamp with true balanced XLR and single-ended RCA inputs and outputs, 64Hz-8kHz band control, and a bypass mode for comparing processed and original sound.

3.63.6 out of 5 starsUpdated October 14, 2026
$99.99Price checked October 14, 2026
Check price at Douk Audio
Douk Audio T7 7-Band Equalizer Balanced XLR / RCA Preamp

Our verdict

The T7 packs a 7-band EQ, balanced XLR signal path and a via-power-off bypass into a $99.99 desktop unit. Its 0.003% THD and 104dB-plus SNR specs are strong for the price, and the XLR/RCA flexibility suits both hi-fi and studio-adjacent setups. The trade-offs are simple: no volume knob, and both outputs run simultaneously.

Best for
Listeners who want precise 7-band tone shaping with balanced XLR connectivity between a source and their power amp or active speakers.
Skip if
You need a volume knob or expect the XLR and RCA outputs to be selectable rather than always active.
Check price at Douk AudioHow we research

The Douk Audio T7 is a desktop 7-band stereo equalizer with a built-in preamplifier, selling for $99.99. It belongs to the preamp/EQ category and is sized for desktop or shelf use at 152 x 126 x 42mm and 700g, powered by an included DC 12V adapter.

Each of the seven bands - 64Hz, 125Hz, 250Hz, 500Hz, 2kHz, 4kHz and 8kHz - adjusts within a -6dB to +6dB range, letting you compensate for speaker and room shortcomings or reshape the tone of any source. Douk Audio rates the frequency response at 20Hz-20kHz (+/-1dB), total harmonic distortion at 0.003%, and signal-to-noise ratio at 104dB or better, so the EQ itself should stay out of the way of the music.

The T7 handles balanced XLR and single-ended RCA on both the input and output sides, with input sensitivities of 1.5Vrms (XLR) and 0.775Vrms (RCA) and outputs of 3Vrms and 1.2Vrms respectively. Note two quirks before buying: there is no volume control knob, so the unit outputs its rated level, and the XLR and RCA outputs both run at the same time. When powered off, the T7 automatically switches to bypass so you can hear the untouched signal.

Douk Audio ships worldwide with free and expedited shipping options at rates that vary by country; under-2kg parcels travel by airmail in 10-25 days, while heavier shipments use DHL, UPS or FedEx in 5-8 days, with any import duties paid by the customer. Returns are free within 30 days for a full refund and all items carry a 1-year warranty, with exclusions for ordering mistakes, man-made damage or misuse, and subjective change of mind.

What we liked

  • Seven bands with up to +/-6dB of cut or boost let you shape speakers and rooms, not just add loudness
  • Genuine balanced XLR plus RCA inputs and outputs cover both pro-style and consumer gear
  • Bypass mode engages when powered off, so you can A/B the EQ against the original signal instantly
  • Very clean on paper: THD as low as 0.003% and SNR above 104dB
  • Black aluminum shell with good shielding for a compact foot print (152 x 126 x 42mm)

Worth noting

  • There is no volume control knob, so the T7 outputs its rated level regardless of the knob-free panel
  • The XLR and RCA outputs are always active at the same time, which rules out exclusive output switching
  • It is an equalizer and line preamp only, so a power amp or active speakers are still required

Questions before you buy

Does the T7 have a volume control?

No. Douk Audio notes the T7 has no volume control knob and outputs its rated level, so volume is handled by your amplifier.

How does bypass mode work?

Turning off the power activates bypass mode, letting the signal pass through so you can compare the original sound with the EQ-processed sound.

What comes in the box?

The package includes the T7 preamp and one DC 12V power adapter.

What is the warranty and return policy?

Douk Audio offers a 30-day free return or full refund and a 1-year warranty. Excluded cases are ordering mistakes, man-made damage or misuse, and subjective change of mind.

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