Loudspeakers. Brackets. Backing.
Plan the loudspeaker and its mount into the decoupled structure. Use suitable reinforcement and a defined path to the clips, rather than treating the plasterboard as the support.
FluxCore™ Built for the hard part
Discover The FluxCore Effect: multi-density decoupling with load-bearing steel construction. Designed around layered walls, ceilings and project-engineered equipment mounts. Mechanical testing of the clip and channel, and acoustic testing of the complete wall, by SINTEF.

01 See the principle
A softer inner core. A firmer outer core. A different approach to the connection between a room and its structure. Watch the FluxCore film, then explore the measured performance of the complete wall system.
01 / Decouple
FluxCore combines two elastomer cores in the mechanical connection supporting the lining. The softer inner core works within a firmer outer core.
02 / Measure
The complete ProSilence wall was measured in SINTEF's laboratory. Explore the sound reduction at each low-frequency band below.
03 / Build
Connect the clips, channels, floor supports, damping compound and supporting materials in the System Planner.
ENGINEERED TO SUPPORT The load-bearing side of FluxCore
Soft core. Serious support. FluxCore pairs multi-density decoupling with a load-bearing steel clip. Use the capacity for substantial board mass and additional local equipment loads — from studio loudspeakers to private-cinema installations. Fewer clips where suitable. More load headroom where it matters.
Calculated permissible ceiling load with safety factor 2.5 — about 48.4 kg mass equivalent. Mean laboratory failure load: 1,503.5 N. Wall shear has separate 350 N guidance for intended decoupling function.
STUDIOS + PRIVATE CINEMAS Beyond evenly distributed board weight
Higher capacity at each clip is not only about using fewer clips. It also creates useful load headroom for substantial ceiling linings, projector mounts, Atmos speakers and other equipment carried by a properly designed isolated structure.
Put the capacity where the room needs it.
Plan the loudspeaker and its mount into the decoupled structure. Use suitable reinforcement and a defined path to the clips, rather than treating the plasterboard as the support.
Build equipment loads into the ceiling design from the start. The 475 N figure is the SINTEF-derived permissible load for the tested clip/channel ceiling orientation; anchors, backing, leverage and any required secondary restraint still need their own checks.
Allow for fixtures and local weight concentrations, not just the lining. The clip layout can be reinforced locally while preserving the intended isolated mounting concept.
PER-CLIP LOAD BUDGET / CEILING EXAMPLE
For this comparison only, every clip supports 0.36 m² at 30 kg/m²: 10.8 kg of uniformly distributed ceiling lining load. A common 600 × 600 mm grid isolates the per-clip capacity comparison from the separate wall-spacing example below.
Load-budget illustration, not a rated point load. Reserve at one clip is not a permissible loudspeaker weight, and reserves cannot simply be added to rate a mount. Bracket leverage, unequal load sharing, channels, backing, anchors and dynamic forces govern the actual equipment design. The sources use different load definitions; this is not a matched load test.
CEILING CAPACITY + WALL GUIDANCE
For ceiling pull-out, SINTEF calculated a permissible load of 475 N per clip using a 2.5 safety factor — approximately 48.4 kg mass equivalent. The mean laboratory failure load was 1,503.5 N. This is the relevant headline capacity for suspended ceilings and overhead equipment planning.
Wall shear behaves differently. There, the draft report recommends limiting load to 350 N (about 35.7 kg mass equivalent) with the intended decoupling function in mind, based on deformation behaviour. Neither figure is an acoustic rating at that load.
The 30 kg/m² supported mass is an illustrative design input, not the measured weight of a named ceiling. The common 600 × 600 mm field gives 10.8 kg per clip. FluxCore ceiling: 475 N ÷ 9.80665 = approximately 48.44 kg mass equivalent; arithmetic reserve approximately 37.64 kg in this illustration. IsoMax: 16.3293 kg with 25 ga channel leaves 5.5293 kg arithmetic reserve; 21.7724 kg with 22 ga channel leaves 10.9724 kg. Both plotted IsoMax values use the manufacturer's 2.5:1 safety-factor column. Its alternative 2:1 column gives 20.4117 kg and 27.2155 kg, respectively. Each 16 kg comparator limit gives 5.2 kg arithmetic reserve. MuteClip's separate 12 kg planning target gives 1.2 kg reserve. Rounding is for display only.
FluxCore source: SINTEF PR26-00288, version 01, 14 August 2026. For ceiling pull-out, the report calculates 475 N permissible load with safety factor 2.5 from a mean laboratory failure load of 1,503.5 N. For wall shear, the report separately recommends 350 N with the intended decoupling function in mind, based on deformation behaviour. Neither value is an acoustic measurement at that load. The complete wall's low-frequency measurements were made separately and do not establish unchanged acoustic performance at every equipment load or a tested acoustic advantage over competing clips under concentrated loads.
IsoMax source: Kinetics installation guidelines, page 2, published by Kinetics Group. The capacity depends on channel gauge and is calculated from tests in which the channel deforms and pulls out; it is not a separate limit established by acoustic testing. Kinetics lists the same design-load table for wall shear and ceiling tension. The 2.5:1 factor is suggested for more critical life-safety applications; the manufacturer also lists 2:1 values. Its maximum spacing is 1,219 mm along channels and 610 mm between channels, subject to the load and installation requirements. The 600 × 600 mm illustration above is a common comparison grid, not an IsoMax installation prescription. Neither load row is asserted to be the specific gauge of acoustic test AT001058.
Kinetics IsoMax: original installation and load table, page 2 ↗
MuteClip: manufacturer maximum load and 75% planning guidance ↗
GenieClip RST: manufacturer maximum design load ↗
Higher per-clip capacity can be allocated to spacing or to additional local loads; it cannot be counted twice. The System Planner provides a material and layout starting point, not an engineered equipment-mount rating.
THE CAPACITY ADVANTAGE / MADE VISIBLE
See what greater capacity per clip can enable. This example compares a 600 × 1,200 mm FluxCore layout with MuteClip's published 600 × 600 mm stud-wall grid — before perimeter and detail requirements.
PLANNING EXAMPLE
600 mm between rows × 1,200 mm along each row. ProSilence planning example; confirm the selected boards, channels, anchors and loads.
PUBLISHED STUD-WALL GRID
600 mm between rows × 600 mm along each row. iKoustic stud-wall installation guide, January 2026, pages 2–3.
Four rather than eight isolation points carry the same illustrative mass. Fewer clip units to place where the construction allows — not a claim of 50% lower project cost, installation time or better acoustic isolation.
These are repeating sections of a larger wall, not two complete wall installations. Boundary clips, openings, joints and concentrated loads can change the final count. The assumed mass includes everything carried by that lining; it is not the measured weight or acoustic result of a specific assembly.
THE LOAD BEHIND THE LAYOUT
FluxCore / primary ceiling rating
475 N≈48.4 kg mass equivalentSINTEF calculated permissible ceiling load with safety factor 2.5. Separate wall guidance is 350 N (≈35.7 kg) for intended decoupling function. Neither is a separate acoustic rating at that load.
MuteClip / manufacturer limits
16 kg maximum12 kg planning targetiKoustic aims for no more than 75% of its published maximum load. Neither figure is a measured failure load.
GenieClip RST / manufacturer limit
16 kg per clip600 × 1,200 mm standard spacingPliteq also publishes the wider spacing. The distinction here is capacity per clip, not a claim that every competitor uses a denser grid. Spacing must suit the chosen lining weight.
Different source definitions and test bases are shown explicitly; this is not a matched load test. No remaining capacity is being promised for a speaker or projector at a single board fixing. Equipment loads need suitable backing, distribution and project-specific design.
Calculation: area per clip = row spacing × spacing along the row; clip density = 1 ÷ area per clip; illustrative load per clip = 30 kg/m² × area per clip. Rounding is for display only. The 2.4 × 1.2 m repeating field contains 4 clips at 600 × 1,200 mm or 8 clips at 600 × 600 mm.
FluxCore: the illustrated grid is a ProSilence planning assumption, not a universal board-manufacturer approval or an additional SINTEF test. The load recommendation is from SINTEF PR26-00288, version 01, 14 August 2026. Read the full distinction between failure load, strength-based permissible load and intended-function load below.
MuteClip installation guide / stud walls, pages 2–3 ↗
MuteClip manufacturer FAQ / maximum and planning load ↗
GenieClip RST manufacturer FAQ / load and standard spacing ↗
Source check: 17 September 2026. Capacities are per clip in the specified use, not the load capacity of the complete wall, its channels, its backing or an arbitrary equipment fixing. Comparison is for regular wall fields, not ceilings.
Design multi-layer gypsum-fibre linings as a complete load-bearing assembly. Select the number and spacing of clips for the board weight, compound and finish.
Include speakers, projector mounts and other equipment in the load plan. Use suitable backing, fasteners and additional clips where concentrated loads require them.
Design the mount into the decoupled structure rather than unintentionally bridging it. Check the complete connection, not the clip alone.
Equipment mounting requires project-specific design for total load, local load distribution, leverage, backing and anchors. A per-clip figure is not a permissible load on an arbitrary screw in a gypsum board, and the board weight already uses part of the system capacity.
SINTEF PR26-00288, version 01, 14 August 2026: four samples in each orientation. The test results below are from the available draft report. Mechanical capacity and acoustic behaviour under load are different questions.
| Result / load basis | Ceiling orientation | Wall orientation |
|---|---|---|
| Mean laboratory failure load | 1,503.5 N | 1,485.5 N |
| Calculated permissible load, safety factor 2.5 | 475 N About 48.4 kg mass equivalent | 543.5 N About 55.4 kg mass equivalent; see functional limit below |
| Report recommendation for intended acoustic function | Acoustic performance at the 475 N load was not assessed in this mechanical test. | Limit to 350 N About 35.7 kg mass equivalent; recommendation based on deformation behaviour, not a separate acoustic test at this load |
Failure loads are not working loads. On walls, the report's 350 N recommendation takes precedence over the higher strength-based calculation when preserving the intended decoupling function. The report calls for each installation to be designed individually.
Selected competitor reference: Pliteq publishes a maximum design load of 16 kg for GenieClip RST. iKoustic publishes a maximum of 16 kg for MuteClip and recommends planning below 75% of that maximum. These are manufacturer load definitions, not results of the same test method or evidence that either product fails at 16 kg. No ratio of break strength to a competitor's working load is presented.
GenieClip RST product specification / maximum design load ↗
MuteClip manufacturer guidance / load and operating margin ↗
FIRE PERFORMANCE / EUROPEAN CLASSIFICATION
Fire behaviour matters in real building projects. The tested FluxCore U-boat has been laboratory classified B-s1,d0 for reaction to fire according to EN 13501-1:2018.
LABORATORY CLASSIFICATION / REACTION TO FIRE
EN 13501-1:2018
Report XDD06260125071501FAR
Classification of the tested FluxCore U-boat. s1 denotes the lowest smoke-production class within this classification system; d0 denotes no flaming droplets or particles under the applicable test criteria.
Laboratory tested and classified B-s1,d0. BST Testing (Shenzhen) Co., Ltd. classified the FluxCore U-boat according to EN 13501-1:2018, report XDD06260125071501FAR, dated 15 July 2026. The classification basis includes EN 13823:2020+A1:2022 and EN ISO 11925-2:2020 testing.
Scope matters: the classification applies to the tested FluxCore U-boat product parameters, with A1 or A2 substrates and mechanical fixing as stated in the report. It is a reaction-to-fire classification of the tested product — not an EI/REI fire-resistance rating for a complete wall, ceiling or floor, and not a type approval or product certification.
* The same FluxCore elastomer material is used in FluxCore Clip. The EN 13501-1 classification report itself identifies the U-boat as the tested product.
02 Understand the measurements
Measured in the laboratory. Presented by frequency. Explore the 50–80 Hz sound reduction of the complete ProSilence wall, then compare it with named clip-based constructions and their total wall thickness.
MEASURED PERFORMANCE / NOT A SIMULATION
Complete wall assembly
ISO 10140-2 · 25 August 2026
Sound reduction index R. Laboratory measurements of the tested wall — not a clip-only improvement value.
Total wall thickness: outer finished face to outer finished face, including both board packs, the frame and the decoupled lining. Not the clip depth or added lining alone.
External lab · SINTEF Community
SINTEF 102036124-2-1
182 mmTOTAL WALL THICKNESSNominal total from the corrected ProSilence build-up
98 x 48 mm timber studs (98 mm wall depth) + four 12.5 mm gypsum-fibre boards + 34 mm clip offset on one side = 182 mm.
External laboratory measurement by SINTEF Community; provisional data sheet
External lab · Riverbank / LF values unofficial
AT001058 / RAL TL02-40
187 mmTOTAL WALL THICKNESSReported total wall thickness
89 mm timber frame; two 15.9 mm boards per side; clips on one side.
Riverbank external-laboratory assembly test; Kinetics states the supplementary 31.5–80 Hz values were calculated from additional measurements and are unofficial R&D data
Knauf laboratory · ISO 10140-2
SWC 21 093-05 / W623
Approx. 185 mmTOTAL WALL THICKNESSReported finished wall depth (FWD)
90 mm timber frame with 80 mm mineral wool; 40 mm cavity; CD 60/27 resilient lining on direct vibration hangers; 12.5 + 15 mm Diamant board layers to both faces.
Knauf-published laboratory measurement at Knauf Gips KG Iphofen; report SWC 21 093-05, dated 22 February 2022
iKoustic lab-performance data · lab not identified
Timber wall / source page 11
Approx. 184 mmTOTAL WALL THICKNESSCalculated total, not a measured total
95 mm timber frame; one 15 mm board opposite two 15 mm boards and Tecsound.
Published by iKoustic as lab-performance data; the cited sheet gives source/receiving-room volumes but does not identify the laboratory or an independent report number
Published test report · TL07-670
TL07-670 / timber wall
197 mmTOTAL WALL THICKNESSManufacturer nominal total wall thickness
One timber frame; two approx. 16 mm boards per side; clips on one side.
Pliteq-published TL07-670 test-reference data; Pliteq states GenieClip assemblies are tested in NVLAP-certified laboratories, while the cited brochure does not name the laboratory for this report
Test provenance is shown for every series because these low-frequency datasets do not have identical verification status. Selected complete walls, not a ranking of every configuration sold under each brand. Knauf W623 is the approximately 185 mm published configuration, chosen because its total depth is close to the 182 mm FluxCore assembly. Missing 50 and 63 Hz GenieClip values are left blank, not inferred. IsoMax low-frequency values are Kinetics-published supplementary calculations from additional measurements and are explicitly marked unofficial R&D data by Kinetics. MuteClip values are published by iKoustic as lab-performance data, but the cited sheet does not name the laboratory or an independent report number. ProSilence values are external SINTEF laboratory measurements from the provisional data sheet. All thicknesses refer to complete wall constructions.
31.3 dB for the SINTEF-measured ProSilence wall versus 23.3 dB in MuteClip Double's published timber-wall table. Different complete assemblies; see construction and source details.
38.4 dB for the SINTEF-measured ProSilence wall versus the published 31.0 dB for GenieClip RST, test TL07-670. A comparison of complete assemblies, not clips in isolation.
Measured in the laboratory, not simulated. ProSilence values are from SINTEF data sheet 102036124-2-1, 25 August 2026, marked “PROVISIONAL DATA SHEET / INTERNAL USE ONLY”. The laboratory measurements are complete. The formal report is pending. The corrected nominal wall thickness is 182 mm: 98 mm timber framing + four 12.5 mm gypsum-fibre boards + 34 mm clip offset on the isolated side. This replaces the earlier 150 mm figure; the acoustic measurement values are unchanged. The measured acoustic figures are not simulations or estimates. These measurements apply to the tested wall, not every room calculated below or a floating floor.
| Tested wall | Total wall thickness | 50 Hz | 63 Hz | 80 Hz | Source status |
|---|---|---|---|---|---|
| ProSilence FluxCore External lab · SINTEF Community SINTEF 102036124-2-1 | 182 mm Nominal total from the corrected ProSilence build-up | 26.1 | 31.3 | 38.4 | External laboratory measurement by SINTEF Community; provisional data sheet |
| Kinetics IsoMax External lab · Riverbank / LF values unofficial AT001058 / RAL TL02-40 | 187 mm Reported total wall thickness | 24.0 | 30.0 | 36.0 | Riverbank external-laboratory assembly test; Kinetics states the supplementary 31.5–80 Hz values were calculated from additional measurements and are unofficial R&D data |
| Knauf W623 Knauf laboratory · ISO 10140-2 SWC 21 093-05 / W623 | Approx. 185 mm Reported finished wall depth (FWD) | 19.6 | 23.7 | 39.0 | Knauf-published laboratory measurement at Knauf Gips KG Iphofen; report SWC 21 093-05, dated 22 February 2022 |
| MuteClip Double iKoustic lab-performance data · lab not identified Timber wall / source page 11 | Approx. 184 mm Calculated total, not a measured total | 22.1 | 23.3 | 24.4 | Published by iKoustic as lab-performance data; the cited sheet gives source/receiving-room volumes but does not identify the laboratory or an independent report number |
| GenieClip RST Published test report · TL07-670 TL07-670 / timber wall | 197 mm Manufacturer nominal total wall thickness | — | — | 31.0 | Pliteq-published TL07-670 test-reference data; Pliteq states GenieClip assemblies are tested in NVLAP-certified laboratories, while the cited brochure does not name the laboratory for this report |
ProSilence: SINTEF 102036124-2-1, test date 25 August 2026, marked provisional/internal use only. The manufacturer-corrected nominal build-up is 98 mm timber frame + four 12.5 mm gypsum-fibre boards (50 mm total) + 34 mm clip offset on the inside = 182 mm. This replaces the earlier 150 mm figure, which omitted the clip offset. The dimension is calculated from the stated component sizes; the unchanged acoustic values come from SINTEF laboratory measurements.
IsoMax AT001058: Kinetics identifies Riverbank Acoustical Laboratories / RAL TL02-40 as the external testing agency for this wall. Kinetics separately publishes 31.5–80 Hz values and states that these supplementary values were calculated at additional test frequencies from measurements made using ASTM E90-99 procedures; Kinetics explicitly classifies them as unofficial research-and-development data, not part of the standard test range. The 50/63/80 Hz points shown here are therefore external-lab-derived measurements with manufacturer-published supplementary calculations, not an in-house simulation.
Knauf W623: Knauf report SWC 21 093-05 documents an approximately 185 mm finished wall depth and third-octave sound reduction of 19.6 dB at 50 Hz, 23.7 dB at 63 Hz and 39.0 dB at 80 Hz. The test was carried out at Knauf Gips KG Iphofen to ISO 10140-2 and is used here because the complete wall depth is closely matched to the 182 mm FluxCore assembly.
MuteClip Double: iKoustic publishes the 50/63/80 Hz values in its MuteClip Systems Performance Data and links that material as lab-performance data. The cited sheet lists source and receiving room volumes and the treated timber-wall construction, but it does not identify the laboratory or an independent report number. We therefore label it as manufacturer-published lab-performance data with the laboratory not identified, rather than calling it independently verified. Approximately 184 mm remains a calculated total, not a measured overall dimension in the sheet.
GenieClip TL07-670: Pliteq publishes TL07-670 as a test-report reference for the 197 mm timber wall and publishes 31 dB at 80 Hz and 39 dB at 100 Hz. Pliteq states that GenieClip assemblies are laboratory tested and its specification requires assembly testing in NVLAP-certified laboratories; the brochure cited for TL07-670 does not name the laboratory. We therefore identify it as published test-report data and avoid assigning a specific laboratory that the source does not state. No 50 or 63 Hz values are published for this assembly in the cited brochure.
Kinetics: IsoMax assembly and report references ↗
Kinetics: supplementary low-frequency source ↗
Knauf: W623 185 mm laboratory result / SWC 21 093-05 ↗
iKoustic: performance sheet, page 11 ↗
iKoustic: 74 mm lining-depth specification ↗
Pliteq: construction and results, printed pages 14 and 20 ↗
The homepage is deliberately limited to 50-80 Hz; the linked source material is not truncated. The substantially thicker 254 mm IsoMax AT001090 wall and other non-matched wall configurations are outside this initial comparison. Adding two further 12.5 mm boards on the stiff side would make a nominal 207 mm wall (182 + 25 mm), with two layers on the isolated side and four on the stiff side. This proposed assembly is not represented by the current acoustic curve; a future test must have its own results, date, layer schedule and measured thickness.
SINTEF measured the complete wall according to ISO 10140-2. The overall result is Rw (C; Ctr) = 61 (−1; −5) dB. The measured wall, the planner's room and the individual components are different scopes; no automatic acoustic rating is assigned to the planner output.
| Frequency / Hz | Sound reduction R / dB | Qualifier |
|---|---|---|
| 50 | 26.1 | Provisional measured value |
| 63 | 31.3 | Provisional measured value |
| 80 | 38.4 | Provisional measured value |
Values below 50 Hz are not supplied by this table. No estimated sub-50 Hz points are added.
FIELD CASE 01 Holmenkollen · Oslo, Norway
A completed ProSilence residential installation measured in the field on 14 October 2025 using Norsonic instrumentation. We publish field results separately from laboratory data because they describe different measurement conditions and different scopes.
Standardized level difference measured for the completed installation.
Apparent sound reduction index measured for the same completed installation.
COMPLETED ROOM / FIELD MEASUREMENT
These are project-specific field results, not a universal product rating. DnT,w and R′w are two ratings derived from the same field measurement and should not be treated as two independent performance claims.
Receiving-room condition: the receiving room was almost unfurnished at the time of measurement and therefore unusually reverberant. Furnishing the room will reduce reverberation and the perceived transmitted sound level in normal use. The published DnT,w and R′w figures already include standardized reverberation corrections; the approximately 5 dB difference between them primarily reflects their different normalization methods and the room/partition geometry, rather than a performance gap that is expected to disappear as furniture is added.
ISO/TS 19488:2021 defines Class A as the highest acoustic class for dwellings. When expressed as DnT,w, the Class A threshold is 62 dB for airborne sound insulation between a dwelling and rooms outside it. The measured 72 dB is 10 dB above that level. ISO/TS 19488 is an international classification framework, not an EU-wide building regulation.
The Holmenkollen measurement report classifies the measured R′w = 67 dB as Sound Class A under NS 8175:2023, against the report's stated Class A threshold of 63 dB. The result is therefore 4 dB above the highest class threshold stated in the project report.
The low-frequency comparison above uses controlled laboratory data. Overall installed performance is documented with field measurements from completed projects. Additional measured installations will be added as they are completed.
03 The core of the system
Explore the components at the heart of ProSilence, then build the supporting layers around them. The System Planner connects both in one practical project schedule.

Walls + ceilings / Decouple
Connect the lining to the structure through the isolation system, with ProSilence channels carrying the board layers.
Explore the component ↗
Floating floors / Support
Bring decoupling into the floor build-up. Plan the support layout and specify the floor structure for the project load.
Explore the component ↗
Between rigid layers / Damp
Viscoelastic damping between board layers, used alongside mechanical decoupling as part of the selected build-up.
Explore the component ↗Walls, ceilings and floating floors need their own construction details and relevant test evidence. Airborne wall insulation and floor impact insulation are different measurements.
04 From component to complete room
A working room planner, not a product list. Enter your dimensions, choose the treated surfaces and see calculated component quantities — ready for a discussion with your installer, consultant or local partner.
Preparing the system planner…
05 See it in practice
Explore the technology and see it in practice. Press Play to watch each film here on ProSilence. The embedded YouTube player loads only on request.
Start with the technology at the centre of the system.
A practical demonstration of floor decoupling, not a substitute for a laboratory impact-sound rating.
Explore a studio project using ProSilence and CineVent.
06 European partner development
We are building the European ProSilence partner network. Connect the technology with your local expertise — from specifying the construction to supplying the components and supporting installation.
A focused product family supported by an explanation of the system, technical content and a practical planning tool. Discuss territory, supply and local requirements.
Turn a client's room into an initial component schedule. Share it with the project team and resolve the installation details before ordering.
Review the build-up, examine the low-frequency data and discuss how the system fits your project constraints.