Master Industrial Design Brief
Product Vision
Create a compact connected tabletop radio inspired by Dieter Rams and classic Braun restraint, updated for the IoT era. The product should combine a warm wood-look cabinet, calm architectural proportions, tactile physical controls, and a small digital display with modern streaming-focused functionality. It should feel domestic, premium, durable, and timeless rather than gadget-like.
Core Product Intent
- Streaming-ready home audio device
- WiFi enabled
- Bluetooth enabled
- Rechargeable battery option for unplugged listening for a few hours
- Small-format tabletop object with furniture-like presence
- Minimal front panel with two knobs and a small center display
Exterior Size Direction
- Width: 220 mm fixed target
- Height: 125 mm nominal target
- Depth: 95 mm nominal target
- Corner treatment: modest soft radii
- Form language: rectilinear with softened edges, not overly rounded
Visual Character
- Wood-look outer cabinet
- Neutral front insert or baffle panel
- Dark small display window centered on the front
- Two tactile knobs as primary interaction points
- Restrained symmetrical speaker grille treatment
- Minimal visible technical clutter
- No visible antennas
- No flashy lighting or smart-speaker styling
Front Elevation Summary
The front face should be calm, symmetrical, and horizontally balanced.
Primary front zones:
- Left acoustic zone
- Left knob zone
- Center display zone
- Right knob zone
- Right acoustic zone
Front feature targets:
- Knob diameter target: 28 mm to 36 mm
- Baseline knob diameter: 32 mm
- Knob center positions: approximately 45 mm to 60 mm in from each side depending on speaker layout
- Display visible window target: 55 mm to 70 mm wide and 18 mm to 28 mm tall
- Baseline display window: 62 mm x 22 mm
- Minimum knob-to-display visual clearance: 14 mm
- Minimum knob-to-side-wall clearance: 16 mm
- Minimum grille-to-edge margin: 8 mm
Side and Top Summary
Side Profile
- Slight rear fullness is acceptable to preserve acoustic volume and battery space
- Front face may be inset by 2 mm to 4 mm from the cabinet shell
- A subtle base reveal or plinth is encouraged for visual lift
- Rear panel reserved for charging, service access, and optional ventilation strategy
Top View
- Clean uninterrupted top plane
- Continuous wood-look surface preferred
- No top-facing controls in the baseline concept
- Seam strategy should stay off the top surface if possible
Control and UX Summary
- Left knob: browsing, source selection, or navigation emphasis
- Right knob: volume and confirm/action emphasis
- Push and long-press behaviors should be implemented in firmware rather than adding extra front-panel buttons
- Avoid additional front controls unless absolutely necessary
- Display should support source, stream metadata, network state, battery state, and setup flows
- Display must remain visually subordinate to the cabinet and knobs
Speaker Grille Summary
- Symmetrical left/right grille fields are preferred
- Baseline grille field per side: 52 mm wide x 68 mm tall
- Alternative zone range per side: 45 mm to 65 mm wide and 55 mm to 80 mm tall depending on driver choice
- Grille language should be geometric and restrained
- Avoid oversized perforation fields that dominate the front composition
CMF Direction
- Cabinet: warm walnut or similar wood-look finish
- Front insert: matte warm gray, off-white, charcoal, or another neutral contrast tone
- Knobs: graphite, matte metallic, or aluminum-like finish with subtle tactile grip
- Display: dark smoked window appearance when idle
- Grille: fine perforated metal or acoustically transparent fabric over support structure
User Perception Goals
- Calm
- Tactile
- Domestic
- Trustworthy
- Modern without appearing disposable
- Premium but understated
Mechanical and Packaging Summary
Internal Zoning
- Front center: display module and window assembly
- Front left/right: speaker zones and knob mechanical volumes
- Mid-body: main PCB zone
- Lower rear or lower center: battery zone for stable center of gravity
- Upper rear or side rear: antenna keep-out region
- Rear wall: power/charging and service access
Main PCB Envelope
- Single primary PCB preferred
- Initial PCB target size: 140 mm to 170 mm wide and 45 mm to 70 mm tall
- PCB should be placed to preserve left/right acoustic volume and front-control mechanics
Display Envelope
- Reserve approximately 8 mm to 18 mm depth behind the display area depending on final module choice
- Include allowance for connector bend radius, mounting stack-up, and bezel structure
Knob/Encoder Envelope
- Reserve keep-out behind each knob for encoder or potentiometer body and connector clearance
- Front panel structure must support knob shaft alignment and rigidity
Battery Envelope
- Rechargeable battery sized for a few hours of unplugged use
- Battery should be mounted low in the enclosure where practical
- Battery must avoid direct thermal coupling to the amplifier and avoid the antenna near-field region
Antenna Constraints
- Use a non-metallic enclosure region near the antenna location
- Keep battery metal, shielding, dense ground, and speaker magnet structures away from the antenna where practical
- Avoid placing the antenna directly behind a metal grille if possible
Rear/Bottom Functional Allocation
- Rear panel: charging input, optional line/service port, possible ventilation
- Bottom: feet, labeling, fasteners, and optional service seam if needed
Design Guardrails
- Do not let the display dominate the front face
- Do not add excessive buttons
- Do not use plastic smart-speaker aesthetics
- Do not make the grille visually stronger than the knobs
- Do not make the enclosure too shallow for acoustic and battery needs
- Do not expose antennas or unnecessary technical features
CAD and Rendering Guidance
Use the product as a restrained Braun-inspired connected radio with:
- 220 mm width
- 125 mm height
- 95 mm depth
- wood-look cabinet
- two 32 mm front knobs
- centered 62 mm x 22 mm display
- subtle speaker grille fields
- slightly inset front panel
- furniture-like stance and material transitions
Key Open Decisions
- Final display technology and aspect ratio
- Single speaker vs stereo left/right architecture
- Exact grille pattern language
- Final battery capacity vs depth tradeoff
- Need for rear passive radiator or venting
- Final materials stack and assembly strategy
Immediate Use
This brief should be treated as the consolidated baseline for:
- industrial design refinement
- enclosure CAD modeling
- PCB packaging studies
- front-panel stack-up design
- schematic and PCB architecture alignment with the enclosure intent