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ii Warranty Speck Electronics products are warranted to the original owner to be free of defects in material or workmanship. This warranty does not apply to any product subject to accident, misuse, neglect or failure to comply with normal maintenance procedures or if the serial number has been defaced, altered, or removed; nor will Speck Electronics accept responsibility for damages resulting from improper installation, alteration or unauthorized parts or repairs.
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Chapter 1 Introduction Section 1 Introduction General Thank you for purchasing our X.Sum Mixer. The X.Sum has operational features that are easy to understand and you should be up and running in no time. If you are unfamiliar with audio equipment or audio signal flow, it is recommended that you read this manual. If you have any questions regarding the X.Sum or any Speck product, do not hesitate to contact Speck Electronics. Speck Electronics 341 E.
Chapter 1 Introduction Section Standard Accessories 2 The X.Sum is shipped with the following list of accessories: · PS-6 Power Supply · Operations Manual · BB-03 Breakout box · Power cord (NA version only) Optional Accessories The following Mix link interface cables to interface additional X.
Chapter 1 Introduction Section X.Sum General Description 3 The X.Sum is a 32 x 4 line mixer that can be used for external DAW summing or as a line mixer for synths, samplers, and effect returns. Any of the 16 stereo channels can be assigned to either the main stereo Mix output or the stereo Mix-B output. Connect the X.Sum to virtually any line level source: balanced, unbalanced, transformer, or transformer-less. The X.Sum has high headroom that will handle balanced signals up to +28dBu.
Chapter 1 Introduction Section 4 Specifications Line input impedance Balanced Unbalanced 30K ohms 15K ohms Maximum input level +28dBu Output Impedance All Active-balanced outputs 60 ohms Maximum output level (2k load) All Active-balanced outputs +28dBu (Balanced) Frequency Response (12 dB gain) (Any line input to mix output) 3Hz-54kHz (+0/-.5dB) THD+n (+12dBu any line input, Gain 12, +24dBu mix out) .
Figure 1. X.Sum signal Flow To Multi-Purpose I/O Jack To Multi-Purpose I/O Jack RIGHT LINE INPUT LEFT (MONO) MONO (Option) LINK CABLE RIGHT LEFT RIGHT LEFT MIX-B OUTPUT PAN MIX-B MAIN MIX MIX ASSIGN To Additional X.
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Chapter 2 Installation & Setup 7 Installation & Setup General The following information should give you the basics on how to install the X.Sum mixer and power supply. The proper installation of the X.Sum requires a clear understanding of audio wiring, AC distribution, grounding, and shielding techniques. If the X.Sum is being installed into a larger studio or as a expander to a host console, it may be necessary to retain the services of someone experienced in these matters.
Chapter 2 Installation & Setup 8 In the unlikely event that a fuse blows, it is EXTREMELY important that a fuse of the same type and current rating be replaced. The chart below in Figure 2 lists the fuse current ratings to be used for your countries mains voltage. All fuses are 20mm x 5mm slow blow type. 100 VAC 1.0 Amp Fuse Chart for PS-6 Power Supply 120 VAC 220 VAC 230 VAC 1.0 Amp .5 Amp .5 Amp 240 VAC .5 Amp Figure 2. Environmental Considerations The X.
Chapter 2 Installation & Setup 9 Due to the high performance of the X.Sum, it is recommended that you use only the highest quality audio cable. A high quality cable by definition is a cable that provides good mechanical strength, high microphonic noise immunity, high frequency response, low crosstalk, and 100% shielding ability. All audio cable used with the X.Sum should be a 3 conductor foil shield type (2 inner conductors and a shield drain conductor).
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Chapter 3 Operation Section 11 Mixer Operation Overview In this section we hope to give you basic information on the operation of the X.Sum and adequately describe its controls, switches, and connectors. The information in this section of the manual is intended to help with the technical process when using your X.Sum. Words alone could not adequately describe how to adjust the controls for every situation you might encounter with the X.Sum.
Chapter 3 Operation Section Signal Flow Diagram 12 When any future reference is made to the controls or switches of the X.Sum, it will be assumed that they have been set to their neutral positions. Use this channel signal flow diagram shown below in Figure 3 as a reference when reading the descriptions of the controls, switches, and connectors [1] through [16] in this chapter.
Chapter 3 Operation Section 13 Input Channel 1. Input Level Control 3 1 4 2 The smaller (inner) knob of the black capped concentric is a dual rotary potentiometer that simultaneously and equally adjusts both the left and right channel levels. The 0dB mark is the "unity gain" setting for the input channel. There is 12 dB more gain available past the “0db” mark. It is recommended that the input channel be set to this "0dB" mark when the X.Sum is being used exclusively as a summing box. 2.
Chapter 3 Operation Section 14 Master Section 7 5 8 6 9 5. Master Level Control This pot acts as the master volume to the Mix-A output. The operation of this control does not affect the operation of the Monitor level [7]. 6. Master Mono Switch When depressed, this switch sums the left and right signal together, creating a mono composite for the Mix-A. The operation of the Mono switch does not affect the Mix-B stereo mix. A yellow L.E.D. indicates the operation of the Mono switch.
Chapter 3 Operation Section 15 Input Channel Connectors 10 11 10. Left/Mono Input Jacks Typically, this input is used to connect one side of a stereo or dual channel source. The "mono" designation on the left jack indicates that this jack should be used when you have only a monoural source. 11. Right Input Jack Typically, this input is utilized to connect the alternate side of a stereo or dual voice source. An input channel cannot function in stereo unless the right input is connected.
Chapter 3 Operation Section 16 Output Connectors 13 12 14 15 17 16 Figure 4. BB-03 combo breakout box 12. Mix Output Jacks These balanced 1/4" TRS phone type connectors are the left and right outputs for the stereo mix bus. The signal present at these jacks is adjusted by the Mix Master Control [5] on the front panel. The configuration for the ¼" TRS Mix Output Jacks are as follows: Tip = High (+) Ring = Low (-) Sleeve = Ground Note - All active-balanced output circuits of the X.
Chapter 3 Operation Section 17 14. Breakout Box Connector This modular plug connects the BB-03 Breakout Box to the multifunction I/O connector [13] on the rear panel of the X.Sum. 15. Mix-B Output Jacks These balanced ¼" TRS jacks are the left and right outputs of the Mix-B bus. The signal present at these jacks is adjusted by the Monitor [7] control on the front panel. 16.
Chapter 3 Operation Section 18 20 18 19 21 18. A.C. Power Inlet This AC (mains) power inlet accepts a standard IEC power cord. Before connecting the power cord, make certain that power cord matches the operating voltage shown on the voltage setting switch [21]. The ground pin of the power cord is internally connected to the chassis. For safety reasons, do not lift the ground on the power plug by using a ground lift adapter. 19 . Fuse 20. Power Switch 21.
Chapter 4 Wiring and Other 19 Wiring & Other General The following information is not specific to the operation of the X.Sum, but rather general information regarding the “care and feeding” of an audio system. A general discussion about AC, AC grounding, audio grounding, EMI, and quality wiring is discussed in this section. These subjects are very often overlooked or misunderstood, and should be given consideration when interfacing your equipment to any audio product.
Chapter 4 Wiring and Other Clock noise and AC 20 Clock noise is one of the greatest enemies of the audio racks AC system. If a computer or any microprocessor based device (most samplers and effects are) emits or somehow couples its clock signal with the neutral or earth of its own power cable, it will contaminate your AC system and carry the clock noise into other equipment; almost always with undesirable results.
Chapter 4 Wiring and Other 21 If a patchbay is utilized in your mixing system, the rules for shielding change. With a patchbay, normally all shields are connected at the patchbay jacks, and not connected at the mixer or external audio equipment. EMI and RFI The occurrence of EMI (Electro Magnetic Interference) and RFI (Radio Frequency Interference) in a contemporary studio system should be of great concern and not overlooked when installing the X.Sum.
