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ART TubeOpto8 Mic Preamp with ADAT I/O   

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The ART TubeOpto8 is a cost-effective 8-channel input/output expander for any ADAT lightpipe-equipped audio interface, hard disk recorder, or DAW. E...Click To Read More About This Product

Available 03-23-2017

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8-channel I/O expander for ADAT lightpipe equipped audio interfaces, direct-to-disc recorder, or DAW.

The ART TubeOpto8 is a cost-effective 8-channel input/output expander for any ADAT lightpipe-equipped audio interface, hard disk recorder, or DAW. Eight high-quality, second-generation, discrete, Class A microphone preamps are packaged in a single rack space with 8-channel, 24-bit digital I/O.

Every input on the ART TubeOpto8 audio interface offers full control of the signal path with pad, phase, and low-frequency roll-off switches. Input gain and variable output level control of each channel allows up to 70dB of clean gain (up to 64dB input gain) with incredible sonic transparency, or for the tube stage to be dialed in for warming effects and soft clipping. Each channel on the ART audio interface has wide-range LED meters to monitor the preamp output levels while clip indicators monitor mic preamp peak levels.

ADAT lightpipe I/O handles eight channels of 24-bit audio input and output at either 44.1 or 48kHz sample rates. Wordclock in and thru-puts allow multiple ART TubeOpto8's to be synced in complex system configurations.

  • 8 fully featured Class-A tube mic preamps
  • 8 channels of ADAT lightpipe digital 24-bit audio I/) at 44.1 or 48kHz
  • Input gain and output level controls on every channel
  • Input pad, phase flip, and low frequency roll-off switches on every channel
  • 2 additional front-mounted, high-impedance instrument line inputs

Record more simultaneous channels with any ADAT-compatible interface or hard disk recorder. Order now!


TubeOpto8 Mic Preamp with ADAT I/O

  • Input Impedance:
    Mic: 6.4KÎ
    Line: 20KÎ
    Instrument: 2.5MOmega;

    Output Impedance:
    Balanced outputs: 200Î balanced

    Frequency Response:
    Analog in to Digital out: 12Hz - 20KHz +0, -1dB @ 44.1KHz sample rate

    1KHz: <.015% @ -30dB ref clipping
    20-20KHz: < .033%

    HPF: 80Hz, 1-pole

    Equivalent Input Noise
    Mic/Line: -130dBu, Input shorted, Max gain, "A" wtd.
    Instrument: -105dBu, Input shorted, Max gain, "A" wtd.

    Maximum Input Level
    Mic/line: +18dBu balanced w/Pad
    Instrument: +15dBu
    Meter clip light: -2dB ref. A/D clip (0dB FS)

    Maximum Gain
    Mic: 64dB
    Instrument: 36dB

    Maximum Output level
    Balanced: +20dBu
    Unbalanced: +14dBu
    Output level switch: Lowers Max. Output by 10dB @ -10dBV setting

    Wordclock Range: 40KHz - 52KHz
    Sample Rate Settings: 44.1KHz, 48KHz, ADAT, Wordclock
    A/D Dynamic Range: 105dB ("A" wtd.)
    D/A Dynamic Range: 105dB ("A" wtd.)
    A/D Latency: 0.667ms(48KHz), 0.725ms(44.1KHz), 32 samples

    D/A Latency: 0.458ms(48KHz), 0.500ms(44.1KHz), 22 samples

    Dimensions: 1.75"H x 19.0"W x 14.4"D (44.5mm x 482.6mm x 365.8mm)
    Weight: 13.2lb. (6kg)
    Power Requirements:: USA ” 105-125VAC, AC 60Hz, 29 Watts Typical, Export units configured for country of destination.
    Minimum System Requirements: ADAT interface port

Review Snapshot

by PowerReviews
ARTTubeOpto8 Mic Preamp with ADAT I/O

(based on 2 reviews)

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Reviewed by 2 customers

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(3 of 3 customers found this review helpful)


upgraded !!!!

By Garthe

from pacific north west

About Me Professional Musician

See all my reviews

Ask me a question

Verified Reviewer


  • Clear Sound
  • New Pass Thrugh Switches


  • None so far

Best Uses

  • A Swiss Army Knife In 1 U

Comments about ART TubeOpto8 Mic Preamp with ADAT I/O:

I was greatly surprised by the direct through switches witch now lets you use this in a full analog manner. Its a Swiss army knife for your studio. I know there was a work around with the adat in to out but know you don't have to there are 4 switches 1 each bank of 2 pre's witch allow for analog pass through to the balanced outs.
what a great surprise.

(5 of 5 customers found this review helpful)


Nice Upgrade

By RustyHammers

from St Augustine FL

About Me Professional Musician

Verified Buyer


  • Clear Sound
  • Versatile


    Best Uses

    • Amateur Recording
    • Events
    • Home Studio
    • Performances
    • Professional Recording

    Comments about ART TubeOpto8 Mic Preamp with ADAT I/O:

    I purchased the Tube Opto8 for a somewhat unconventional use, as a pre amp addition to a PA rack, knowing it would also do ADAT conversion for recording duty. Researching the product I discovered that the original design required a lightpipe cable to loop back in order to use the pre amp on its own. When the unit arrived I discovered that ART had upgraded the device so that the preamps can be assigned in pairs directly to the balanced outputs. Great move ART, I'm guessing there were some unhappy customers and a few returns? I myself had shopped for optical cable but had not purchased any before the unit arrived.
    Comparing the unit with identical microphones proved the sound is enormously clear with just the right amount of tube warmth. I intend to offer this option to my PA customers recomending it for vocals and drums.
    An added bonus is that the optical return will do ADAT conversion from any source, with auto clocking.

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