EASE 5 Alternative — Acoustic Design for Architects Who Aren't Acoustic Engineers

EASE 5 ships with a 387-page user manual — and that is just the getting-started guide. The full documentation suite, including the AURA module reference, the GLL editor guide, and the scripting API, exceeds 1,200 pages. This documentation exists for a reason: EASE 5 is an electroacoustic simulation platform designed for audio engineers who model loudspeaker arrays, delay towers, and distributed PA systems within complex 3D room geometries. It is exceptionally good at that job. But for an architect who needs to verify whether a meeting room meets WELL v2 Feature 74 reverberation targets, those 1,200 pages represent a learning curve that serves no purpose.

This article compares EASE 5 with AcousPlan on the specific question: which tool serves architects and designers who need room acoustic compliance without becoming acoustic engineers?

EASE 5: What It Actually Is

EASE (Enhanced Acoustic Simulator for Engineers) was created by Dr. Wolfgang Ahnert in the early 1990s and is now developed by AFMG (Ahnert Feistel Media Group) in Berlin. It is fundamentally a loudspeaker simulation platform that includes room acoustic modelling as a supporting module. Understanding this distinction is essential to evaluating whether EASE 5 is the right tool for architectural acoustic work.

The EASE 5 Workflow

1. Build or import a 3D room model: Users define room geometry surface by surface, or import from SketchUp/AutoCAD. Every surface must be closed and properly oriented. The model requires watertight geometry for the AURA ray tracing module to function correctly.

1. Assign materials: Select absorption coefficients for each surface from EASE's material library (~500 materials). Materials are assigned per surface, with frequency-dependent absorption at octave or third-octave bands.

1. Place loudspeaker models: Select from AFMG's GLL (Generic Loudspeaker Library) database of 30,000+ loudspeaker files. Define aiming angles, drive levels, delay settings, and signal routing.

1. Place listener positions: Define receiver points or grids across the audience area.

1. Run simulation: EASE calculates direct SPL, total SPL, STI, frequency response, and RT60 at each receiver position. The AURA module adds ray-traced early reflections and late reverberation.

1. Interpret results: View coverage maps, echograms, and parameter tables. Compare against design targets.

For an architect checking whether a 60 m² meeting room meets BB93 or WELL v2 requirements, steps 3 through 5 are entirely unnecessary. The loudspeaker database — EASE's core asset — is irrelevant. The architect needs absorption coefficients, room dimensions, and a reverberation time calculation. EASE makes them navigate a loudspeaker simulation interface to get there.

EASE 5 Pricing and Access

AFMG offers EASE in several configurations:

Only EASE 5 Full includes the room acoustic modelling capabilities (RT60 calculation, material assignment, AURA module). EASE Focus 3, while cheaper, provides only loudspeaker aiming visualisation without room acoustic simulation.

The $3,500/year price point places EASE in the professional AV consultancy tier. For firms designing sound systems on a dozen projects per year, the per-project cost is manageable. For architectural practices where acoustic compliance is a periodic requirement, $3,500/year for software used 3-5 times annually means each compliance check costs $700-1,200 in software alone.

Learning Curve: The Real Barrier

Price is a tangible barrier. Learning curve is a hidden one — and in practice, it is more significant.

EASE 5 was designed by acoustic engineers for acoustic engineers. The interface assumes familiarity with electroacoustic concepts: loudspeaker directivity patterns (balloon data), coverage uniformity, signal chain modelling, and acoustic ray tracing parameters. An architect encountering EASE for the first time faces terminology and workflow concepts that are foreign to architectural practice.

Estimated time to productive use:

The learning curve difference is not about user intelligence — it is about tool design. EASE 5 exposes every parameter of its electroacoustic simulation engine because its target users (audio consultants) need that control. AcousPlan abstracts the calculation engine behind a workflow designed for the compliance checking task: enter room dimensions, assign surface materials, select the applicable standard, read the result.

Feature Comparison: EASE 5 vs AcousPlan

Worked Example: The Same Room in Both Tools

A 60 m² meeting room: 8 m long, 7.5 m wide, 3 m high (volume = 180 m³). Finishes: plasterboard ceiling, glazed wall on the 7.5 m side, painted plaster on the remaining three walls, carpet flooring. The project requires WELL v2 Feature 74 compliance (maximum RT60 = 0.60 s for enclosed meeting rooms).

In EASE 5

1. Create geometry (20-30 minutes): Define six surfaces — floor, ceiling, and four walls. Each surface requires corner coordinates in 3D space. The glazed wall needs separate definition from the plaster walls. Ensure all surfaces are properly oriented (normals pointing inward) and the model is watertight.

1. Assign materials (5-10 minutes): Select absorption coefficients for each surface from the library. Plasterboard: α₅₀₀ = 0.06. Double glazing: α₅₀₀ = 0.03. Painted plaster: α₅₀₀ = 0.02. Carpet: α₅₀₀ = 0.30.

1. Place source and receiver (5 minutes): Even without loudspeaker simulation, EASE requires source and receiver positions for the AURA module to calculate room acoustic parameters.

1. Run AURA simulation (2-5 minutes): Configure ray tracing parameters (ray count, reflection order, scattering). Execute simulation.

1. Extract RT60 (2 minutes): Navigate to the results panel. Find the RT60 value at 500 Hz.

1. Check compliance (5 minutes): Open BB93 or WELL v2 documentation. Find the applicable RT60 limit. Manually compare against the simulated value.

In AcousPlan

1. Enter dimensions (30 seconds): Type 8.0, 7.5, 3.0 into the room dimension fields.

1. Assign surface materials (45 seconds): Select plasterboard ceiling, carpet floor, double glazing (one wall), painted plaster (three walls) from dropdown menus.

1. Click Calculate (1 second): The engine applies ISO 3382-2:2008 §A.1 (Sabine equation) and returns results.

1. Read compliance result (0 seconds): The dashboard shows RT60 = 1.22 s at 500 Hz with a red "FAIL" indicator against WELL v2 Feature 74 (target: 0.60 s).

Why the Results Are Nearly Identical

For a rectangular room with uniformly distributed absorption and no complex geometry, the Sabine equation (T₆₀ = 0.161V/A, per ISO 3382-2:2008 §A.1) produces results within 5-8% of ray tracing predictions. The physics is the same — sound energy decays exponentially in a diffuse field. Ray tracing models the individual reflections; statistical methods describe the aggregate behaviour. For compliance checking, where the question is "does RT60 exceed 0.60 s?", both methods answer identically because the margin is large.

The 5-8% difference between methods becomes significant only in rooms where the diffuse field assumption breaks down: extreme aspect ratios, highly non-uniform absorption, coupled volumes, or curved focusing surfaces. A standard meeting room exhibits none of these pathologies.

Where EASE 5 Genuinely Wins

Loudspeaker Coverage Simulation

EASE 5's defining capability is modelling how specific loudspeaker models interact with room geometry. If a meeting room needs a ceiling-mounted speech reinforcement system (e.g., for videoconferencing), EASE can predict coverage uniformity, STI at each seat, and frequency response variation across the listener area. No room acoustic tool replaces this.

Large Venue Audio Design

Worship spaces, conference centres, sports arenas, and performance venues where the sound system is a primary design element. EASE's GLL database and coverage mapping engine are purpose-built for this work.

Combined Electro-Acoustic and Room Acoustic Analysis

When the sound system design and room acoustic treatment must be optimized together — adjusting ceiling absorption affects both RT60 and speaker coverage uniformity — EASE handles both calculations in a single model. Separate tools require manual coordination.

EN 54-24 Emergency Voice Alarm

EASE Evac specifically addresses voice alarm compliance. If your project involves life safety audio, the EASE ecosystem provides a compliance pathway that no other platform matches.

Where AcousPlan Genuinely Wins

Architect-Friendly Workflow

AcousPlan was designed for users whose primary discipline is architecture, not acoustics. The interface uses architectural terminology (room types, surface finishes) rather than acoustic engineering terminology (ray count, transition order, scattering coefficient). The result: architects produce correct acoustic assessments without learning acoustic simulation theory.

Material Database Depth

AcousPlan's 5,600+ materials from 115 brands include absorption coefficients, NRC ratings, cost per square metre, and embodied carbon (CO₂e). This allows architects to filter materials by performance, budget, and sustainability targets simultaneously. EASE's material library of ~500 entries provides absorption coefficients only — no cost data, no carbon data, no manufacturer product information.

Automated Compliance Checking

AcousPlan checks results against five national building codes (BB93, DIN 4109, NCC 2022, NRA, IBC) and two international standards (WELL v2 Feature 74, ANSI S12.60). Results show pass/fail with the specific clause reference. EASE provides raw acoustic parameters that the user must manually interpret against code requirements.

Sound Insulation Calculation

Architects frequently need both room acoustics (RT60, absorption) and sound insulation (STC/Rw through party walls) on the same project. AcousPlan provides both in a single platform with 52 pre-defined wall and floor assemblies. EASE handles room acoustics only.

Zero Cost of Entry

AcousPlan's free tier has no calculation limits. An architect can check every project, every room, without budget approval. EASE's $3,500/year license requires a procurement decision, budget allocation, and a commitment to learning the software.

The Question Architects Should Ask

The decision between EASE 5 and AcousPlan reduces to a single question: does this project involve designing a sound system?

If the answer is yes — if the project includes PA design, loudspeaker selection, coverage optimization, or voice alarm compliance — EASE 5 is the right tool. Its loudspeaker simulation engine is unmatched, and the cost is justified by the complexity of the task it addresses.

If the answer is no — if the project requires room acoustic compliance, material selection, treatment specification, and documentation — AcousPlan provides a faster, simpler, less expensive workflow specifically designed for that task. The architect does not need to learn electroacoustic simulation to verify that a classroom meets BB93.

The Intermediate Case

Some projects include both room acoustic compliance and sound system design, but the work is split between disciplines. The architect handles the acoustic treatment specification; an AV consultant handles the sound system. In this scenario, the architect uses AcousPlan for the acoustic compliance scope, and the AV consultant uses EASE for the sound system scope. Each professional works in the tool designed for their contribution.

This division is increasingly common in practice. Acoustic treatment and sound system design are separate scopes of work, often procured from different consultants. Using a single integrated tool (EASE) makes sense when one person handles both scopes. Using specialised tools makes sense when the work is divided.

Cost of Ownership: 3-Year Projection

For a practice running 5 acoustic compliance checks per year, the per-check cost is $933 with EASE versus $70 with AcousPlan Pro. With AcousPlan's free tier, the per-check cost is $0.

Related Reading

• EASE vs AcousPlan: Full Feature Comparison — comprehensive breakdown including EASE Focus 3, Address, and Evac
• AFMG Software Alternative — comparison covering AFMG's full product suite (EASE, EASERA, SysTune)
• Best Acoustic Design Software 2026 — market overview of all major platforms