The Optimal Audio Up 4S is a low-profile two-way ceiling speaker with a shallow steel backcan, designed for installations where ceiling void depth is limited. Its 4-inch LF driver and 0.7-inch silk dome tweeter deliver two-way audio quality in a form factor that fits where standard-depth models cannot, making it ideal for refurbishment projects and buildings with restricted plenum space.
LF Driver
4″ (105mm)
Low frequency
HF Driver
0.7″ (20mm)
Silk dome
Power Handling
8W
100V line
Coverage
150°
Conical
Features
✓
Shallow steel backcan for restricted ceiling voids
Shallow steel backcan for restricted ceiling voids
✓
Two-way design with 0.7-inch silk dome tweeter for clear high-frequency detail
Two-way design with 0.7-inch silk dome tweeter for clear high-frequency detail
✓
150° conical coverage — widest dispersion in the Up range
150° conical coverage — widest dispersion in the Up range
✓
70V and 100V transformer taps plus low-impedance operation
70V and 100V transformer taps plus low-impedance operation
✓
Low-profile form factor ideal for refurbishment projects
Low-profile form factor ideal for refurbishment projects
✓
Steel backcan provides fire rating and acoustic isolation
Steel backcan provides fire rating and acoustic isolation
✓
White finish for unobtrusive ceiling integration
White finish for unobtrusive ceiling integration
Specifications
| Model | Up 4S |
| SKU | UP4S-W |
| Type | Two-way low-profile ceiling speaker |
| LF Driver | 4″ (105mm) |
| HF Driver | 0.7″ (20mm) silk dome tweeter |
| Power Handling | 8W |
| Line Voltage | 70V / 100V + Low-Z |
| Coverage | 150° conical |
| Backcan | Shallow steel |
