Rockville RS6X9-4 6x9 Quad Speaker Enclosure Box - Double-Angle Fit

In this review the Rockville RS6X9-4 6x9 quad speaker enclosure is presented for vehicle owners who want a sealed, space-saving way to add four 6x9 speakers for fuller sound without complex fabrication. The bottom line: this enclosure's sealed chambers and heavy 3/4' MDF construction deliver tighter bass and clear midrange in a compact double-angle cabinet that fits behind seats or in narrow cargo areas. It is best for installers seeking a ready-made, sturdy box that supports deeper mounting depths and secure connections.

Key Features

• Made in the USA: Built domestically to provide consistent manufacturing quality and easier sourcing for replacement parts or support.
• 3/4' MDF construction: Thick medium-density fiberboard reduces unwanted vibrations and helps the enclosure maintain tight low-frequency response.
• Sealed chambers: Each of the four compartments is sealed to produce tighter bass and improved clarity compared with open or poorly partitioned boxes.
• Secure connections: Gold spring-loaded terminals offer reliable speaker contact and simplified wiring for installers.
• Double-angle design: The angled shape increases vehicle compatibility and lets the cabinet sit flush behind seats or in sloped cargo areas.
• Precision mounting: Machine-cut mounting holes and 4-hole mounting pattern make for an accurate fit with common 6x9 speakers up to 7.0' mounting depth.

Who It's For

The RS6X9-4 is aimed at car audio enthusiasts, installers, and DIYers who want to add four 6x9 speakers in a sealed, factory-like enclosure without cutting custom panels. It suits vehicles with limited depth behind seats, larger SUVs, and anyone who prefers a finished box over ad hoc installations.

It is less appropriate for those who need a ported or bandpass solution for maximum SPL or for systems that require custom internal tuning. Buyers who require ultra-lightweight enclosures for racing applications should also consider alternative materials.

Pros & Cons

Pros

• Sturdy 3/4' MDF construction that minimizes resonance for cleaner sound.
• Sealed, individually partitioned chambers that tighten bass response and improve clarity.
• Gold spring-loaded terminals and precision cut mounting holes for reliable, easy installation.
• Double-angle shape increases vehicle compatibility and supports 7.0' mounting depth.

Cons

• Some customers reported mixed impressions of build quality, so finish and fit can vary between units.
• The sealed design sacrifices the extra low-end extension that a ported enclosure can provide.

Specifications

Brand	Rockville
Model	RS6X9-4
Construction	3/4' MDF
Design	Double-angle, sealed chambers
Mounting	4-hole pattern, machine-cut, supports up to 7.0' depth
Dimensions	49' L x 8.5' D x 8' Front H x 5' Back H
Terminals	Gold spring-loaded

Our Verdict

The Rockville RS6X9-4 is a practical, value-oriented sealed enclosure for anyone who wants to install four 6x9 speakers quickly and with predictable acoustic results. Its 3/4' MDF build, sealed chambers, and precision fittings make it a sensible choice for most street and daily-driving applications, though buyers seeking maximum ported bass or flawless cosmetic finish should check the unit in person.

Frequently Asked Questions

Will this box fit behind a rear seat?
The double-angle design and slim depth make it suitable for many vehicles behind seats, but measure clearance and speaker depth up to 7.0' before purchasing.

Can I use any 6x9 speaker in this enclosure?
Most standard 6x9 speakers that fit the machine-cut mounting holes and do not exceed 7.0' mounting depth will work; verify speaker mounting depth first.

Is the enclosure ported or sealed?
The RS6X9-4 features sealed chambers for each speaker, which yields tighter bass and clearer midrange compared with ported designs.