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MOTU 2408mk3 Expansion Interface (No PCI-424 Card)

B&H # MA2408MK3EIO MFR # 4851
MOTU 2408mk3 Expansion Interface (No PCI-424 Card)

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MOTU 2408mk3 Expansion Interface (No PCI-424 Card) Front View Back View

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Product Highlights

  • 24 Input / 26 Output
  • 8 Analog I/O
  • 24 ADAT or Tascam I/O
  • Wordclock I/O
  • Standalone Format Conversion
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The 2408mk3 Expansion Interface from MOTU adds all of the inputs and outputs of the 2408mk3 core system for users of an existing PCI-424 based MOTU audio systems (2408mk3, 24I/O, HD192, etc.). The unit is exactly the same interface that comes with the PCI-424 system and provides 8 channels of pristine 24-bit/96kHz analog input and output, combined with 24 channels of ADAT and Tascam digital I/O. (Only a total of 24 inputs can be used simultaneously, but across all formats.)

In addition to the analog outputs, the interface also features a stereo output with front panel volume control so one can plug powered monitors directly into the interface, while a separate headphone output with volume control is on the front panel. S/PDIF digital I/O is also provided for exchanging digital audio with a wide variety of other devices. An extra S/PDIF stereo output of the main mix is available that could, for example, be left connected to a DAT machine.

The 2408 mk3 interface can also function as a standalone format converter. The addition of the expander is as simple as connecting the supplied Audio Wire cable to one of the free terminals on the host PCI 424 card.

8 analog inputs/outputs with 24-bit/96kHz converters on balanced/unbalanced 1/4" TRS jacks
3 banks of ADAT optical provide 24 channels of ADAT optical input/output at 44.1/48kHz
12 channels at 88.2/96kHz
3 banks of Tascam TDIF provide 24 channels of TDIF (Tascam digital) input/output
12 channels at 88.2/96kHz
Stereo S/PDIF in/out (with an extra stereo out)
Provides stand-alone format conversion
Transfer any format to any other, up to 24 channels at a time.
DC-coupled TRS outputs - can be used with Volta (not included) to manipulate and sequence voltage-controlled modular synthesizers from a host DAW
Converters 24-bit
Sample Rates 44.1, 48, 88.2 and 96kHz
Analog In 8 x 1/4" TRS phone, balanced or unbalanced
Analog Outputs 8 x 1/4" TRS phone, balanced or unbalanced
2 x 1/4" TRS phone main out
Digital Input Connectors 24 (channels) ADAT
24 (channels) TDIF
1 x S/PDIF RCA coaxial
1 x BNC Wordclock
Digital Output Connectors 24 (channels) ADAT
24 (channels) TDIF
2 x S/PDIF RCA coaxial
1 x BNC Wordclock
MIDI In/Out No
Sync In/Out Word clock, SMPTE I/O
Headphone Output Yes
Noise SNR: 108dB, A-weighted
Power Requirements 100~120V AC, 60Hz
Minimum System Requirements As per main audio system
Dimensions (WxDxH) 19 x 7 x 1.75" (483 x 178 x 45mm)
MOTU 2408mk3 Expansion Interface (No PCI-424 Card)
  • AC Power Cord
  • AudioWire Cable (15 ft)
  • Software CD-ROM
  • Limited 2-Year Warranty

    by PowerReviews
    MOTU2408mk3 Expansion Interface (No PCI-424 Card)

    (based on 1 review)

    Ratings Distribution

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    • 1 Stars



    Reviewed by 1 customer

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    Much better than the mkII

    By David

    from Staten Island, NY

    About Me Professional Musician

    Verified Buyer


    • Clear Sound
    • Compact
    • Durable
    • Easy To Use
    • Lightweight
    • Versatile


      Best Uses

      • Home Studio
      • Professional Recording

      Comments about MOTU 2408mk3 Expansion Interface (No PCI-424 Card):

      I bought this to replace my 10-year-old mkII, whose A/D and D/A converters were beginning to fail. The front panel has much better indicators and metering than the mkII.

      I have friends with cruddy MBox interfaces, and they are toys compared to this.

      Share this review

      Additional Hardware

      Required item: Additional Hardware (not included) are required to operate this device.

      MOTU - PCI-424e Card (Upgrade)
      • You Pay: $295.00
      Call to order ?
      This item cannot be sold on the web. Please call 800.952.3386


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