Glossary

Playback curve with time constants 3180, 318 and 75 µs (IEC 60098 / RIAA).

Second-order Butterworth Sallen-Key, equal resistors and equal capacitors, f0 = 1/(2πRC), K = 1 + Rf/Rg = 3 − 1/Q.

Two cascaded Sallen-Key sections give a Linkwitz-Riley 24 dB/oct filter, each stage Q = 0.71.

The master isolator splits the mix with LR4 crossovers (LP4 at 300 Hz, a mid band, HP4 at 3 kHz) and a band amp from full kill to +6 dB.

HI shelf 3 kHz +6 dB to full kill; HI MID bell 1.1 kHz +10 / −27 dB; LO MID bell 350 Hz +10 / −27 dB; LO shelf 180 Hz +6 dB to full kill. Every knob is exactly 0 dB at 12:00. Design target.

On the HI and LO shelves, and on the master isolator, the pot minimum is full kill. Design target: beyond 60 dB in the stop band of the LR4 split. Not measured.

A window comparator on a third wiper track drives relay K1 across the dead zone: IN goes straight to OUT and neither filter section is in the path.

The channel fader sets a control voltage for a VCA (control constant 6.1 mV/dB, cited to the THAT 2180 series). Audio never passes through the fader.

Not fitted, as stated on the /mixer page (left out on purpose); a second control bus is a footprint option only.

A switchable send and return, hard-bypassed when off. No effect sits in the signal path when it is off.

Optional send / return (design target) with a BBD ensemble, digital delay or DSP card option. The browser model on /mixer runs four modes in floating point so the idea can be heard; it is not the analogue design.

MN3207, 1024-stage bucket-brigade device. The datasheet gives delay 2.56 ms at 200 kHz to 51.2 ms at 10 kHz. Cited as a design-target option for the spatial FX ensemble. Nothing here is built or measured.

Echo processor IC with 44 kbit RAM, delay set by a VCO through an external resistor. A design-target option for the spatial FX digital delay. Nothing here is built or measured.

Optional per-strip section after the filter and before the fader, switched by a relay. Modes in the browser model: Clean SVF, Ladder, Comb, Bitcrush. Off means nothing in the path.

A four-pole ladder or OTA filter is listed as analogue option A for Texture. The Moog ladder is analysed by Stilson and Smith and modelled non-linearly by Huovilainen. Component values are not set in this draft.

The CUE control sends the strip pre-fader to the cue bus. A cue / master blend pot then feeds the headphone stage. SPLIT CUE puts cue in one ear and master in the other.

A booth output level feeding its own balanced driver, as on the master.

0 dBu = 0.7746 Vrms. The +28 dBu maximum output (design target) equals that times 10^(28/20). The manual shows why ±18 V rails are used for that target.

A goal the finished unit would have to meet. Every figure marked design target is a goal, not a measurement.

Worked out from the cited formula with nominal component values and ideal op-amps. Not a measurement.

Taken from a real unit with a stated method — there are none in this document. When a unit exists, a measurement report will follow the method of IEC 60268-3.

Audio/video, information and communication technology equipment — Part 1: Safety requirements (2023). Cited by title and catalogue page. This draft does not claim compliance.

Sound system equipment — Part 3: Amplifiers (specification and measurement methods, 2018). The method the measurement plan would follow when a unit exists. No results are given here.

Adjustable regulators for the ±18 V rails. Vout = 1.25 × (1 + R2/R1), cited to the Texas Instruments LM317 datasheet.

Low-noise op-amp classes cited for the RIAA stages (NE5534-class, 3.5 nV/√Hz typ; NE5532 dual, 5 nV/√Hz typ). Datasheet figures, not measurements of a built mixer.

Voltage-controlled amplifier series whose datasheet states a control constant of 6.1 mV/dB, cited for the channel fader stage.

ESS 4-channel ADC cited as a converter option for the optional USB-C tap (S10). Datasheet figures for the converter alone; no measured figure for an assembled interface.

USB Audio Class 2.0 device in the XK-AUDIO-316-MC reference, cited for the optional USB-C interface. Design target.

A file and transport format. The converters output integer words; the host converts to 32-bit float when it writes the file. Float does not add range to the analogue path. The browser model also processes and can record 32-bit float WAV.

The optional USB-C interface is specified as USB Audio Class 2.0, asynchronous, as in the XMOS reference. A tap off the analogue path, not part of it.

Op-amp with a complementary emitter-follower stage inside the loop. Design target: 250 mW into 32 Ω. 6.35 mm and 3.5 mm jacks, usable at the same time.

The plate algorithm in the browser model follows Dattorro: input diffusers and tank lengths from the paper’s Fig. 1 and Table 2. Simulation of the software model, not a hardware measurement.

The playable mixer on the web page is a software model built with the Web Audio API. Its filters and effects are not the analogue circuits in the manual, and nothing it plays is a measurement.

Where the browser supports it, the model runs in an AudioWorklet with 32-bit float processing at the device’s own sample rate.

The texture drive, the strip saturators and the master saturator are oversampled 4× (2× in the efficient mode) with half-band filters. Simulation of the software model. The spatial FX’s own saturators are not oversampled yet.

A look-ahead true-peak limiter at −1 dBTP on the output only, using an 8× detector. It does not touch the signal below its threshold. Channel strips have no limiter. The hardware design has no limiter or compressor in the master or booth path.

The optional 24-bit export from the browser model uses triangular (TPDF) dither and reports any samples that were over full scale. Simulation of the software model.

Four hot cues per deck in the browser app. A cue is stored as a whole sample. These are tools of the software model; the hardware design is unchanged and still has no tempo, BPM or sync function.

Loops of 1/4 to 16 bars on the detected beat grid, in the browser app. Tools of the software model, not of the analogue mixer.

A pitch fader of ±8% or ±16% in the browser app. Pitch and tempo move together, like a turntable: key lock is not available in this version. The M4 hardware has no tempo, BPM or sync function.

An optional sync in the browser app that is off until pressed. The manual records that this departs from a DVS1 statement (q24); the hardware has no sync function.