JBL SRX910LA Line Array Base Plate for SRX910LA JBL SRX910LA Array Base Plate. Up to four SRX910LA arrays can be ground stacked on top of compatible subwoofers or support structures like scaffolding, stages, or carts because to the base plate, which is an adaptor frame that can be used universally. Features: Enables ground stacking SRX910LA arrays Allows attaching arrays to subwoofers Universal M20 threaded pole mount Angle range: -15 degrees to +5 degrees Support for up to (4) SRX910LA What's in the Box (1) Base Plate (1) M20 Thumb Screw Echotone Music LLC has been a professional E-commerce Audio Visual Equipment dealer since 1998. We take pride in selling Pro Audio gear for clubs, concert, and broadcast applications. Shipping -Pro packed shipped USPS, UPS or Freight Service. Contact us pay for air mail upgrade on any unit. We are working hard to get your product ( built if needed), processed shipped. Processing times vary, 2-30 days Returns/Refunds- Customer pays for return shipping. Returned items must be sealed/unopened to qualify for a full refund. Refunds are for the Item cost only. Gear returned without all its original packaging, accessories or shows signs of wear, is subject to an additional service fee. This item is now used and it would be unfair to resell to another customer as new. What products can not be returned? - International Sales Clearance items, Avid products, Custom Builds, Road Cases, DT12 items, items identified as non-returnable, discontinued items, used or NOS items, electronic software downloads, demo gear, computer Cards, vacuum tubes, earbuds, raw-frame speakers, turntable cartridges, fog fluid.