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SPL MixDream XP:

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The SPL MixDream XP 16 channel analog summing box for recording studios offers high end analog summing without panorama and fader controls, and can expand the channel count of the SPL MixDream.

General Characteristics

The SPL MixDream XP design plan provides for stereo mix down at the analog level. This concept offers high-grade analog summing without panorama and fader controls, in turn allowing an engineer to retain the entire scope of his computer automation. In use, the MixDreamXP requires almost no departures from an engineer's usual working mode, so that all his trusted DAW features and familiar working routines remain available while the MixDream XP seamlessly expands his aural mixing palette.

One MixDream XP can sum up to 16 audio tracks to a stereo signal, and should the need arise for more than 16 tracks, several MixDream XP units may be linked together. Owners of a MixDream, model 2384, can expand this unit with the cost effective MixDream XP at an identical quality level and by the way, that's where the suffix "XP" comes from (XP=Expansion).

The MixDream XP discrete class A technology is based on the same 60 volt rails (+/- 30V) of the SPL MixDream model 2384. Newly developed circuitry, based on the most modern analog components, guarantees an extremely high slew rate, a very low noise level of -97dBu and a dynamic range of 125dB. Thus the MixDream XP easily reaches the technical level of the best analog consoles.

Analog vs. Digital Summing

Nowadays, many are asking whether analog summing is better than digital summing. Perhaps the real question is whether digital summing better than analog summing? We don't know of anyone who says so. We do know that summing with the MixDream XP creates an amazing signal depth, precise localization and wonderful stereo imaging. Moreover, the addition of individual instruments results in soft and pleasant transitions.

These are analog summing results that we appreciate from past decades of the best analog technology. The MixDream XP now allows DAW users to exploit this potential with maximum comfort and uncompromising quality, ensuring that nothing can stand in the way of the engineer's having the best of both (analog and digital) worlds.

Connection of Sampler, Keyboards etc.

Along with DAW audio tracks and effects machines or processors in the insert loops, samplers, keyboards and expanders may also be connected directly to the MixDream XP. Then the Midi tracks need only be added in the DAW project, the outputs (for example, from a keyboard) are then routed directly to the MixDream XP.

Mono Controls

To save converter channels, all channels may be switched to Mono so that two signals can be converted by a paired D/A. In this case such signals are characteristically chosen which would receive a more central placement in the stereo mix (e.g. kick, snare, lead vocal, bass). All channel pairs must otherwise be panned hard left/right in the mix.


Tracks destined for analog summing are routed from the DAW to the MixDream XP via D/A converters. Identical converters are ideal to exclude level and sound differences.

Although you may often wish to sum more than 16 tracks, a general recommendation to reduce track numbers is to route those tracks to a common output bus of the sequencing program which are not played back simultaneously in your arrangement. This way you avoid digital summing and your production benefits from the full potential of 100% analog summing.

With mono signals one should switch these to mono mode to confine them to single D/A converter, thereby avoiding the waste of having to use a D/A pair for one mono track. In the DAW such signals must be panned hard left or right.

Summing of Subgroups

To reduce track numbers, there are two other options besides the above mentioned "Summing" tip: First off, you could buy additional MixDream XP units (which we confess would make us happy, and we're sure wouldn't disappoint you) or sum your grouped tracks with the MixDream XP itself. For example, if you've done a chorus backup in 16 solo tracks, you can adjust your panning in the DAW and the MixDream XP sums a stereo mix. Again, the sound benefits of analog summing are larger than the disadvantage of a further A/D-D/A conversion.

MixDreamXP in Mastering Applications

Your MixDream XP is predestined for mastering applications, as we've planned its superior sound quality for just such occasions.

Two applications are especially interesting: discrete Mastering, and upsampling to SACD/DVD-A formats. Normally a studio mastering engineer requires that a stereo file be made available for his or her work. But in such a mix down, any problems (for example, significant variations in volume among instrumental subgroups) will mean equally significant limitations to your final mastering options. Instead, if one masters from a discrete mix with single tracks or subgroups, each of these can be adjusted just as easily and quickly in the mastering process, to the extent that even individual groups can be tweaked with different processing. Your final result is clearly better and the time needed, minimal, especially since it is less likely that a new mix will be called for.

Multichannel sessions can be summed in the infinite resolution of analog signal processing equipment, something that may also be of special importance when an engineer wishes to upsample to SACD or DVD-A.

Linking Several MixDream XP Units

An expansion connector provides for a second MixDream XP input should 16 channels not suffice. The Main Outputs of the second MixDream XP must be connected to the Expansion Inputs of the first unit; do not connect both Expansion Inputs.

If more than three SPL MixDream XP boxes are to be summed, we recommend to employ a further MixDream XP as master, otherwise the signals from the first MixDream XP (to cite a "worst case scenario") would unnecessarily be summed in each following unit.

In such a chain one SPL MixDream XP is connected to the Expansion Inputs while all other units are connected to the usual (DB25) Input Channels.


  • Frequency range:
    <1Hz-200kHz (-1 dB)
  • THD+N:
    -103dBu (20-22kHz, Input Level +10dBu)
  • Noise Level:
    -97dBu (20-22kHz, A-weighted)
  • Max. Input Level:
  • Max. Output Level:
    +28dBu (@ 1kHz, THD+N -95dB)
  • Dynamic range:
    125dB (20-22kHz, A-weighted)
  • Crosstalk L-R:
    -90dB (@ 1kHz, Input Level +10dBu)
  • CMRR:
    <70dB (@ 1kHz, Input Level +10dBu)
  • Input Impedance:
    10k Ohm
  • Output Impedance:
    65 Ohm
  • Power Consumption:
  • Dimensions (W x H x D):

    • Standard EIA 19 inch Housing, 1U
    • 482 x 44 x 237mm/19 x 1.76 x 9.5 inch
    • Weight: 3,55kg/7.81 lb

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