CSS-BB4X6 vs MTC-300BB8-B — Compare
JBL Commercial CSS-BB4X6 4" Backcan For CSS8004 vs JBL MTC-300BB8 Backbox For 8" Control 300 Series Drivers B-Stock
The CSS-BB4X6 is a passive mounting bracket pack for 4-inch speakers in drop ceilings, while the MTC-300BB8 is a self-contained acoustic enclosure for 8-inch drivers that shapes tone and bass response. Choose the CSS-BB4X6 if you need simple structural support for smaller speakers; choose the MTC-300BB8 if you need an acoustically engineered backbox that controls resonance and extends bass.
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
JBL MTC-300BB8 Backbox For 8" Control 300 Series Drivers B-Stock
Specs side by side
| JBL Commercial CSS-BB4X6 4" Backcan For CSS8004 | JBL MTC-300BB8 Backbox For 8" Control 300 Series Drivers B-Stock | |
|---|---|---|
| Price | $142.98 | $136.24 |
| Brand | JBL | JBL |
| Condition | New | Refurbished |
Why choose JBL Commercial CSS-BB4X6 4" Backcan For CSS8004
- ✓ Six-pack format ideal for large multi-speaker deployments
- ✓ Compact 4-inch form factor fits standard acoustic tile openings without custom framing
- ✓ Lower cost per unit for bulk commercial installations
- ✓ Minimal labor—direct screw attachment to tile rails
Why choose JBL MTC-300BB8 Backbox For 8" Control 300 Series Drivers B-Stock
- ✓ Acoustically engineered enclosure shapes tone and eliminates resonances
- ✓ Thicker 16-gauge metal and 12 mm MDF lining enhance durability and bass control
- ✓ Larger 8-inch driver compatibility delivers more output and extended bass
- ✓ Five knockout locations offer flexible cable routing for complex installations
Frequently asked questions
What speaker drivers do these fit?
The CSS-BB4X6 is designed for the CSS8004 4-inch speaker. The MTC-300BB8 supports 8-inch Control 300 Series drivers. They are not interchangeable.
Are both compliant with fire and safety codes?
Yes. Both meet UL1480, UL2043, NFPA 90, and NFPA 70 standards when paired with their corresponding UL-listed speakers, making them safe for air-handling plenums and regulated spaces.
Which is better for a large office rollout?
The CSS-BB4X6 six-pack is more economical and faster to install for high-volume deployments of smaller speakers. The MTC-300BB8 is better if you need superior acoustic control and bass performance in fewer, strategically placed zones.
Does the MTC-300BB8 affect sound quality?
Yes. Its engineered 0.71 cubic foot internal volume, MDF lining, and metal construction eliminate resonances and extend bass response, shaping the driver's performance. The CSS-BB4X6 is a passive bracket and does not alter acoustics.