The SA-PTR-4U is a professional-grade 4-space rack case built for touring musicians, DJs, and sound engineers who need reliable protection for their amplifiers, effects units, and signal processors. This road case handles the demands of constant load-ins, transport, and setup without compromising access to your gear.

Built with 3/8" plywood construction and a laminated black exterior, this case delivers the durability needed for regular gigging while keeping weight manageable at 32.1 pounds. The standard 19" mounting rails accommodate all rack-mount equipment, with both front and rear removable doors providing full access during setup and maintenance.

Heavy-duty hardware includes dual spring-loaded handles on each side, steel link locks on both doors, and reinforced L-brackets for structural integrity. The internal dimensions provide 17.5" between front and rear rails, with 20.5" depth from rail to back when the rear door is installed. Four steel rack spaces handle power amps up to moderate wattage, multi-effects processors, wireless receivers, and other essential signal chain components.

This case works well for mobile DJs running club gigs, bands playing venues from coffee shops to mid-sized clubs, and houses of worship with permanent installations that require secure equipment storage. The dual-door design allows rack-mount gear to stay connected while providing access for adjustments.

All mounting hardware is included, and the case ships ready to load your equipment. Seismic Audio backs this rack case with reliable customer support and fast shipping to get your mobile rig road-ready.

Technical Specifications

Frequently Asked Questions

What rack-mount equipment fits in a 4-space case?

A 4-space rack case accommodates most power amplifiers up to 1000-2000 watts, multi-effects processors, wireless receiver systems, compressors, and EQs. Each rack space is 1.75" tall, so you'll have 7" of total vertical mounting space. This size works well for mobile DJ setups or small to medium band rigs where you need essential signal processing without the bulk of larger cases.

Do the front and rear doors both come off completely?

Yes, both the front and rear doors are completely removable, giving you full 360-degree access to your equipment. This is particularly useful when you need to access rear panel connections or when mounting equipment that requires both front and rear support. The doors use heavy-duty hinges and can be quickly removed without tools during setup.

How much weight can this case safely hold when fully loaded?

While the case itself weighs 32.1 pounds, the 3/8" plywood construction and steel reinforcement brackets can handle the weight of typical 4-space equipment loads. Most power amplifiers and effects units that fit in 4 rack spaces will be well within the case's capacity, but always distribute weight evenly and secure equipment with proper rack screws.

What's the difference between this and an 8-space or 6-space case?

The 4-space case is ideal for essential gear like a power amp, wireless receiver, and effects processor, while 6-space and 8-space cases accommodate larger setups with multiple amplifiers or extensive signal processing chains. For mobile DJs and small bands, the 4-space offers the right balance of capacity and portability. Larger cases are better for permanent installations or touring acts with complex rack requirements.

Does this case work for both live sound and studio applications?

Absolutely. The removable front and rear doors make it suitable for both mobile live sound applications where you need quick setup access, and studio installations where you might want to remove doors for better ventilation or easier cable management. The professional-grade construction handles both the rigors of transport and the demands of permanent installation.

WARNING: This product can expose you to chemicals including Di(2-ethylhexyl)phthalate (DEHP), which is known to the State of California to cause cancer. For more information, go to: www.P65Warnings.ca.gov