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Alto SX115 Speaker

  • Product Description
  • Product Video
  • Product Accessories
  • Warranty

No matter what you’re looking for – from a simple stage wedge to a massive subwoofer and everything in between – there’s a SX speaker for you. All of the passive SX speakers feature parallel Speakon NL4 jacks, allowing quick and easy connection of an entire system. All but the SX115 include pole receptacles, allowing you to stand-mount the speakers individually, or mount the speakers on top of the subs for a powerful, full range system.

SX speakers are built to take a beating. Their durable cabinets are covered in a super durableized black texture finish. Recessed handles make it easy to move SX speakers from rehearsal space to stage and back again, and heavy-duty rubber feet ensure that your SX speakers stay put no matter how much volume you pump through them.

Built to take a beating night after night, week after week, the Alto SX115 Speaker's cabinet is made of premium poplar plywood and is covered in a super durableized black textured finish that is scratch and dent resistant. Recessed handles makes the Alto SX115 Speaker easy and safe to move from rehearsal space to stage and back again whlile heavy-duty rubber feet ensure that it stays put no matter how much volume you pump through it. Full length metal grilles protect your speaker's drivers and horns from falling mic stands or other pitfalls of repeated stage use.

The Alto SX115 Speaker delivers a big sound with a large, high-performance 15-inch LF driver (2.5-inch voice coil), and an exacting 1-inch HF driver. What's more, it utilizes a trapezoidal design which greatly decreases the resonance of the standing wave in the cabinet for a more true and exact sound reproduction. The SX115 is the perfect solution for club installations, rehearsal spaces, gigging musicians, mobile DJs, and houses of worships who need additional sound reinforcement.

Continuous Power: 300W
Program Power: 600W
Peak Power: 1200W
Max SPL at 1m: 122 dB Program / 124.5 dB Peak
Frequency Response: (-10dB) 55Hz-20kHz
Impedance: 8 Ohms Nominal
Crossover Frequency: 2kHz /12 dB/Oct
Protection: Electronic Dynamic Protection
Low Frequency Driver: 15" Woofer / 2.5" Voice coil
High Frequency Driver: 1" Neodymium Driver / 1" Voice Coil
Coverage (HxV): 90° H x 60° V Elliptical Wave Guide
Connectors: 2 x SPK4 @Power Input / Link
Cabinet: Trapezoidal Shape, composite wood, Metal Handle, Black Paint finishing
Dimensions (HxWxD): 750mm x 450mm x 420mm (29.53" x 17.72" x 16.54")
Net Weight: 24.98kg / 55.07 lbs

Dimensions (WxLxH): 750mm x 450mm x 420mm
Weight: 55.07 lb

1200 Watts peak power rating
600 Watts program / 300 Watts continuous
15” low-frequency transducer
1” neodymium high-frequency driver
Two parallel Speakon NL4 jacks for input and through connections
Lightweight, trapezoidal cabinet with handles
Rugged black textured finish


Alto warrants its products to be free from defects for 1 year from the date of purchase.