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SM Pro Audio Q-DI - 4-Channel Direct Box and Line Mixer

In Stock
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You Pay: $99.99
Product Highlights
  • 4-Channel DI Box and Line Mixer
  • Balanced Output for Each Input
  • Volume and Pan Controls
  • Per Channel Pad
  • Ground Lift Per Channel
  • Headphone Output with Volume Control

The Q-DI from SM Pro Audio is a four-channel DI box featuring high quality unbalanced to balanced line conversion, in addition to providing an extremely useful built in line mixer. Each input features an attenuation switch, a ground lift switch, volume and pan controls, and terminates in a balanced XLR output.

Housed in a rugged road-worthy half rack-mount enclosure, the unit will find use in home and professional studios, sound reinforcement systems and live PA applications, as well as many other audio fields. It covers all typical applications, such as instrument routing to line inputs. Additionally, its versatile four-channel layout and headphone output makes it ideal for small line mixing applications.

Four channel DI box and line mixer with master control
Balanced XLR output for every 1/4" input
Stereo line out on RCA phono connectors
Volume and pan control on each channel
0, -20 and -40dB attenuation switch on each channel
1/4" headphone output
Ground lift per channel
Type Direct Inject box with Line Mixer
Input Connections 4 x 1/4" TS phone
Input Impedance 47kΩ
Minimum Sensitivity -20dB
Maximum Input Level +16dB
Output Connectors 4 x XLR
2 x RCA phono
Output Impedance 600Ω
Maximum Output Level XLR: 0.0dB (peak level +18.5dB)
RCA: +2.0dB (peak level +18.5 dB)
Frequency Response 20Hz to 20kHz, 0/-2.0dB
Distortion 0.02%
Noise SNR: >74dB
Crosstalk >80dB @ 1kHz, -20dB input
Power 17VDC via included adapter
Dimensions (WxDxH) 8.5 x 8 x 1.75" (216 x 203 x 45mm)
Weight 3.9 lb (1.8kg)
SM Pro Audio Q-DI - 4-Channel Direct Box and Line Mixer
  • External Power Supply
  • One (1) Year Warranty

    by PowerReviews
    SM Pro AudioQ-DI - 4-Channel Direct Box and Line Mixer

    (based on 1 review)

    Ratings Distribution

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    • 1 Stars



    Reviewed by 1 customer

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    (1 of 1 customers found this review helpful)


    A Good Product

    By Rick

    from Sturgis, SD

    About Me Enthusiast

    Verified Buyer


    • Easy To Configure
    • Easy To Use


      Best Uses

        Comments about SM Pro Audio Q-DI - 4-Channel Direct Box and Line Mixer:

        I purchased this 4-channel DI box for use with our Bluegrass band. We have a small PA with a small rack. Our four instruments (Guitar, Fiddle, Banjo, Bass) all plug into this DI box. From there, the four signals go to our Mackie Onyx 1220i mixer. I also have the rackmount kit for this DI Box. It uses 1RU of rack space. This DI box is very straitforward and easy to use and has good clean sound. The signal is not all that "hot" (volume level). It works great with instruments that put out a strong signal. Our guitarist has a Martin guitar with a fairly hot signal. It works perfect with the Martin. But my acoustic bass does not have a very hot signal. The DI box works OK, but it would be nice if the signal was just a bit hotter for my bass. I can compensate by pushing the gain on the mixer for the bass channel. We used to use a separate ART Tube-MP DI box for each instrument. Our four separate ART DI boxes were very inconvenient to setup with cords everywhere (AC power cord "wall warts", and not rackmountable). I did like the ability to "dial in" a certain "warmth" and higher output level with the ART DIs. However, this 4-channel DI box is much better for our overall situation. I recommend this product.

        • Primary use:
        • Business
        • Was this a gift?:
        • No

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