CSS-BB4X6 vs JBL-P3291MX — Compare
JBL Commercial CSS-BB4X6 4" Backcan For CSS8004 vs JBL ACK1 Accessory Caster Kit
The CSS-BB4X6 is a fixed infrastructure component for permanent in-ceiling speaker installation in commercial buildings, while the ACK1 is a mobility accessory for moving subwoofers in live and studio settings. Choose the CSS-BB4X6 if you're installing a permanent audio system in an office or venue; choose the ACK1 if you need to transport and reposition subwoofers between gigs or sessions.
No sales tax on orders shipped outside California — total cost beats national retailers that charge sales tax in nearly every state.
JBL Commercial CSS-BB4X6 4" Backcan For CSS8004
Specs side by side
| JBL Commercial CSS-BB4X6 4" Backcan For CSS8004 | JBL ACK1 Accessory Caster Kit | |
|---|---|---|
| Price | $146.27 | $166.75 |
| Brand | JBL | JBL |
| Condition | New | New |
Why choose JBL Commercial CSS-BB4X6 4" Backcan For CSS8004
- ✓ Pack of six backcans for bulk commercial deployments
- ✓ Meets strict fire and safety codes (UL1480, UL2043, NFPA 90/70) for regulated spaces
- ✓ Reduces installation labor by fitting standard ceiling openings without custom framing
- ✓ Simplified attachment to drop-ceiling tile rail systems
Why choose JBL ACK1 Accessory Caster Kit
- ✓ Four heavy-duty casters rated 100 kg per wheel enable smooth movement of large subwoofers
- ✓ Anti-rattle design eliminates vibration noise during transport
- ✓ Black polyurethane wheels grip floors securely without marking or slipping
- ✓ Works across all skill levels in live performance, touring, and studio contexts
Frequently asked questions
Are these products compatible with each other?
No. The CSS-BB4X6 is a mounting bracket for ceiling-mounted CSS8004 speakers, while the ACK1 is a caster kit for moving SRX900 subwoofers. They serve entirely different installation types and are not used together.
Which one is better for a small studio or home?
Neither is ideal for a small home studio. The CSS-BB4X6 is designed for commercial in-ceiling installation, and the ACK1 suits users who already own large SRX900 subwoofers that need mobility.
What makes the CSS-BB4X6 compliant for sensitive spaces?
The CSS-BB4X6 is engineered and certified to meet UL1480, UL2043, NFPA 90, and NFPA 70 standards, which cover fire safety and air handling in return-air plenums and other regulated commercial environments.
Can I use the ACK1 casters on other subwoofers?
The ACK1 is specifically designed and tested for compatibility with SRX900 Series subwoofers. Use on other cabinets is not recommended without verification of mounting compatibility.