Douk Audio Balanced EQ Preamp: 7-Band Equalizer – Vacuum Tube Preamplifier with

Product description

Douk Audio T8PRO 7-Band EQ Preamp

50Hz-16KHz Equalizer | Vacuum Tube Preamplifier | XLR Blanced Input & Output | 2-Way Audio Switch | Compact Design

50Hz / 125Hz / 315Hz / 750Hz / 2KHz / 6KHz / 16KHz

Refine speaker performance and modify any audio sources and compensate channel imbalances.

Pro-Grade XLR Balanced Input/Output System

Delivers noise-free signal transmission with enhanced separation for pristine sound reproduction.

Classic 6H1N-BN Vacuum Tube Sound Engine

Can be changed to the following models: 6N1/6AQ8. 6SN7GT requires a 6SN7 to 6N1 socket adapter.

RCA/XLR Input Switch + Simultaneous Outputs

Instantly toggle between CH1 and CH2 sources. Two outputs (RCA+XLR) can work at the same time.

1 7-Band & Balance Control

2 XLR Balanced IN&OUT

3 Upgradable Tube System

4 Dual Inpus & Outputs

HiFi Pre-Amplifier for Power Amps

Boosts signal integrity and refines tonality before amplification, revealing hidden details.

XLR/RCA Driver for Studio Monitors

Minimizing coloration for critical near-field monitoring.

1 For Amplifiers

2 For Active Speakers

1 Front

2 Back

3 Side

4 Top

Parameters

Audio input: single-ended RCA / balanced XLR Audio output: single-ended RCA / balanced XLR Frequency response: 20Hz～20KHz(±1dB) Frequency band: 50Hz / 125Hz / 315Hz / 750Hz / 2KHz / 6KHz / 16KHz RCA input sensitivity: 0.775Vrms RCA output level: 1.2Vrms BAL input sensitivity: 1.5Vrms BAL output level: 2.4Vrms THD: 0.01% SNR: ≥98dB Working voltage: DC12V (≥2A) Dimensions(W*D*H): 186*128*38mm / 7.32*5.04*1.50in Package dimensions(W*D*H): 340*240*70mm / 13.39*9.45*2.86in Net weight: 685g / 1.51lb Package weight: 1.1kg / 2.43lb

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.

Douk Audio T8PRO (Black)

Douk Audio & Nobsound

Tube EQ Preamp

Type:

Tube EQ Preamp

50-16KHz (7 Bands)

Bands:

50-16KHz (7 Bands)

RCA / XLR

Audio input:

RCA / XLR

RCA / XLR

Audio output:

RCA / XLR

20Hz～20KHz(±1dB)

Frequency response:

20Hz～20KHz(±1dB)

≥98dB

SNR:

≥98dB

Balance Adjustment

Tube EQ Preamp

Type:

Digital EQ Preamp

50-16KHz (7 Bands)

Bands:

64-8KHz (7 Bands)

RCA / XLR

Audio input:

RCA / XLR

RCA / XLR

Audio output:

RCA / XLR

20Hz～20KHz(±1dB)

Frequency response:

20Hz～20KHz(±1dB)

≥98dB

SNR:

≥104dB

Balance Adjustment

Tube EQ Preamp

Type:

Digital EQ Preamp

50-16KHz (7 Bands)

Bands:

20-16K (9 Bands)

RCA / XLR

Audio input:

2* RCA

RCA / XLR

Audio output:

2* RCA

20Hz～20KHz(±1dB)

Frequency response:

20Hz-20kHz(±0.4dB)

≥98dB

SNR:

≥111dB

Balance Adjustment

Tube EQ Preamp

Type:

Bluetooth EQ Preamp

50-16KHz (7 Bands)

Bands:

5-20KHz (5 Bands)

RCA / XLR

Audio input:

Bluetooth/RCA/AUX

RCA / XLR

Audio output:

RCA/AUX

20Hz～20KHz(±1dB)

Frequency response:

5Hz-20KHz

≥98dB

SNR:

–

Balance Adjustment

Douk Audio T8PRO (Silver)

Douk Audio T7

Nobsound EQ9

Douk Audio EQ5-TONE

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.

Price last updated Mar 04, 2026 05:40:28 UTC. Availability and price subject to change. More info