JBL-P3291MX vs WK-4S — Compare
JBL ACK1 Accessory Caster Kit vs JBL WK-4S Wheel Kit for SRX718S & SRX818SP Subwoofers
The ACK1 is a universal solution compatible with all SRX900 Series subwoofers and suits professionals needing broad equipment compatibility, while the WK-4S is purpose-built exclusively for SRX718S and SRX818SP models with pre-threaded mounting for faster, tool-free installation. Choose the ACK1 if you own or work with various SRX900 cabinets; choose the WK-4S if you specifically own those two smaller subwoofer models.
No sales tax on orders shipped outside California — total cost beats national retailers that charge sales tax in nearly every state.
JBL WK-4S Wheel Kit for SRX718S & SRX818SP Subwoofers
Specs side by side
| JBL ACK1 Accessory Caster Kit | JBL WK-4S Wheel Kit for SRX718S & SRX818SP Subwoofers | |
|---|---|---|
| Price | $166.75 | $161.64 |
| Brand | JBL | JBL |
| Condition | New | New |
Why choose JBL ACK1 Accessory Caster Kit
- ✓ Compatible with entire SRX900 Series subwoofer line for maximum flexibility
- ✓ 100 kg load rating per caster handles larger, heavier cabinets
- ✓ Includes all mounting hardware; works across multiple cabinet types
- ✓ Serves beginners through professionals across all skill levels
Why choose JBL WK-4S Wheel Kit for SRX718S & SRX818SP Subwoofers
- ✓ Pre-threaded mounting points require zero modifications or extra hardware
- ✓ Swivel caster design enables responsive multi-directional movement in tight spaces
- ✓ Engineered specifically for SRX718S and SRX818SP for optimized integration
- ✓ Faster installation with no tools required for matching equipment
Frequently asked questions
Which subwoofers does each kit fit?
The ACK1 works with all SRX900 Series subwoofers and includes universal mounting hardware. The WK-4S fits only the SRX718S and SRX818SP subwoofers, utilizing their pre-threaded mounting points.
Do I need tools or extra parts to install these kits?
The ACK1 includes complete attachment hardware for integration with compatible cabinets. The WK-4S requires no modifications or additional hardware—it mounts directly into pre-threaded points on matching enclosures.
What is the weight capacity and mobility style difference?
The ACK1 offers 100 kg per caster load rating for heavier cabinets with anti-rattle vibration control. The WK-4S features swivel casters designed for responsive directional control in tight load-in spaces and is built for the specific weight profile of SRX718S and SRX818SP models.
Which is better for a beginner or occasional user?
The ACK1 supports all skill levels from beginner to professional. The WK-4S is marketed specifically for professional sound engineers and touring crews with those exact subwoofer models.