Annex F (informative) — Eurorack module survey

Generated by tools/survey.py from the copy of the eis-reference survey in data/survey/ (copied at commit 3604e0e, 2026-10-20). Do not edit by hand.

The figures come from makers' pages, manuals, drawings, and listings, and each row keeps its source. They are evidence for EIS recommendations, not requirements. The samples are not random: they follow the makers whose figures could be found. F.1 shows where the figures come from and how much the result moves when every maker counts equally. Community-entered listing figures are not used.

F.1 Module depth

Depth behind the panel's back face, as each maker or listing states it.

Sample Modules Min Median 90th 95th Max ≤ 50 mm ≤ 60 mm
Depth survey 19 31 32 45 63.5 63.5 94.7 % 94.7 %
Flight-case sample 268 10 35 48 51 100 94.8 % 98.9 %
Combined 287 10 35 46 51 100 94.8 % 98.6 %

The depth survey covers Doepfer and LZX Industries; 2 rows have sources that disagree and keep the survey's figure. The flight-case sample is a second sample: Intellijel, Tiptop, 4ms, Make Noise, Expert Sleepers, a 23-module Doepfer spot sample, and Xaoc, each from the maker's spec page. No module is in both samples. Percentiles are nearest-rank.

Source of the figure Depth survey Flight-case sample
maker page 12 268
retailer listing 7 0

Weighting each of the 8 makers equally, rather than each module, 92.8 % are within 50 mm and 97.8 % within 60 mm, and the median of the makers' medians is 34 mm.

EIS · Module depth behind the panel, 287 surveyed modules 0 10 20 30 40 50 60 70 0% 25% 50% 75% 100% Depth, mm 50 mm: 94.8 % 60 mm: 98.6 %

Makers with at least ten modules in the combined sample:

Maker Modules Median Max
Intellijel 73 32 45
Tiptop Audio 47 40 52
4ms 41 25 40
Make Noise 32 36 48
Expert Sleepers 30 42 51
Doepfer 25 50 100
Xaoc Devices 22 32 46
LZX Industries 17 32 63.5

Bearing on EIS: 94.8 % of the combined sample is within the 50 mm module depth EIS recommends, which is also the deepest common right-angle board depth (5.2.2). A row with 50 mm clear, which EIS also recommends, takes the same share.

F.1.1 Commercial cases

cases.json: the deepest and shallowest module depth that 25 current cases from 11 makers take, from the makers' pages (checked 2026-09-26). The shallow figure is usually over the supply or the bus board.

Maker Case Rows HP per row Deepest, mm Shallowest, mm
Intellijel 7U Performance Case Gen-2 104HP 2x3U + 1U 104 73 43
Intellijel 4U Palette 62HP 1x3U + 1U 62 45.5 37.4
Intellijel 4U Palette 104HP 1x3U + 1U 104 45.5 37.4
Tiptop Audio Mantis 2x3U 104 61 50
Make Noise 2 Zone Skiff 1x3U 104 63.5 50.8
Make Noise 4 Zone CV Bus Case 2x3U + CV bus row 104 63.5 63.5
Doepfer A-100 LC6 (PSU3) 2x3U 84 110 80
Doepfer A-100 LC9 (PSU3) 3x3U 84 110 80
Doepfer A-100 P6 suitcase (PSU3) 2x3U 84 100 70
Doepfer A-100 P9 suitcase (PSU3) 3x3U 84 100 70
Erica Synths 1x42HP Pico Case 1x3U 42 35 35
Erica Synths 2x84HP Aluminum Skiff 2x3U 84 55 33
Erica Synths 2x104HP Carbon Travel Case 2x3U 104 67 54
Befaco 7U Case 2x3U + 1U 104 70 53
4ms Pod20 (powered) 1x3U 20 34 34
4ms Pod48X (powered) 1x3U 48 50 50
4ms Pod60 (powered) 1x3U 60 34 34
4ms Pod64X (powered) 1x3U 64 55 55
4ms Pod104X (powered) 1x3U 104 55 55
Behringer EuroRack Go 2x3U 140 62 40
Arturia RackBrute 3U 1x3U 88 53 53
Arturia RackBrute 6U 2x3U 88 75 53
Pittsburgh Modular Structure 208 Travel Case 2x3U 104 95.3 69.9
Pittsburgh Modular Structure 360 Travel Case 3x3U 120 95.3 69.9
Cre8audio NiftyCASE 1x3U 84 55 55

Bearing on EIS: 20 of 25 current cases give 50 mm somewhere in the row and 17 of 25 give it everywhere; the median case is 62 mm at its deepest and 53 mm at its shallowest. The 50 mm clear depth is a recommendation for that reason: some cases on sale today do not meet it over the supply.

F.2 Module current draw

module-power.json, read 2026-09-30: 223 modules, each from the maker's own figure. Figures are the stated maximums. The statistics use the 219 modules with a width and both 12 V figures that draw from the bus; power sources and host-powered modules are left out.

Rail Median mA/HP 90th mA/HP Mean mA/HP
+12 V 11.2 39.0 15.6
−12 V 2.5 11.7 4.3

None of the 219 modules with a known +5 V figure draws +5 V from the bus. Modules with a jumper-selectable +5 V (some 4ms and Noise Engineering modules) are recorded in the setting that takes none. 13.7 % draw nothing on −12 V. The largest +12 V draw in the sample is 1500 mA. Over the whole sample the −12 V draw is 33 % of the +12 V draw.

Bearing on EIS: no module in the sample needs +5 V from the bus. EIS keeps +5 V optional (BUS-001, BUS-006), because the A-100 bus carries it and some modules use it.

F.2.1 Supplies

supplies.json, read 2026-09-30: 99 supplies, powered bus boards, rail modules, and bricks, with each rating's source and confidence; prices are left out. 53 feed modules and state both 12 V ratings.

Median rating: 1500 mA on +12 V and 1200 mA on −12 V; the median −12 V rating is 83 % of the +12 V rating. 96 % of the 53 with a known +5 V rating provide +5 V.

Bearing on EIS: modules draw about 33 % as much on −12 V as on +12 V, and supplies are rated about 83 %, so +12 V runs out first in most rows. A row is within its supply only when each rail is (ASM-001).

F.3 Bus boards

bus-boards.json, read 2026-09-30: 12 bus boards, from makers' manuals, drawings, and listings. The file also records header positions, outlines, mounting holes, and ribbon lengths.

Maker Product Headers Confidence Power input
Konstant Lab Filtered Bus Board #2 shrouded or keyed published other
Konstant Lab Pocket Bus Board shrouded or keyed listing other
Doepfer A-100BUS V6 shrouded or keyed published ¼ in quick-connect
Synthrotek Noise Filtering Power Distribution Board shrouded or keyed published other
Synthrotek Mini Power Distribution Board shrouded or keyed listing other
Befaco Passive Bus shrouded or keyed published other
Befaco Lunchbus not recorded — not recorded
Tiptop Audio Zeus Passive Bus Board not recorded — ¼ in quick-connect
Tiptop Audio Flying Bus Board shrouded or keyed published other
4ms Bus Stick [Shrouded Headers] shrouded or keyed published other
LeftHandPooch (open hardware, GitHub) Bus Bone EuroRack Bus Board shrouded or keyed published ¼ in quick-connect
Pulp Logic Passive Bus Block not recorded — not recorded

Bearing on EIS: 9 of the 9 boards with a recorded header type use shrouded or keyed headers, which supports keying them (BUS-005). 3 take power on ¼ in quick-connect tabs, among them Doepfer's A-100BUS V6, enough to recommend them (6.5), not to require them.

Header type is recorded per bus board, not per module. No source found records which modules use a 10-pin or a 16-pin header.