Definitive Technology BL-550 Dymension Outdoor Bollard Speaker

Patios, pathways and light commercial grounds get weatherproof sound from the Definitive Technology Dymension Outdoor BL-550, a bollard speaker sold as a single.

A 1 in aluminum oxide dome tweeter and a 5.25 in mineral-filled woofer sit in a rigid mineral-filled enclosure, with a 5 x 8 in pressure-coupled passive radiator adding bass. IP56 protection handles rain, snow and dirt, and the flanged base and included ground spikes allow hardscape or softscape mounting.

Key Features

• IP56 rated: Rain, snow and dirt protection
• Tweeter: 1 in aluminum oxide dome
• Woofer: 5.25 in mineral-filled woofer
• Bass radiator: 5 x 8 in pressure-coupled
• Frequency response: 84 Hz – 24 kHz
• Sensitivity: 86 dB (2.83 V / 1 m)
• Inputs: Jacketed single-cable pigtail; 8 ohm, 70 V, 100 V
• Mounting: Flanged base and ground spikes included

Ideal For

• Patios: weatherproof sound
• Pathways: bollard design
• Light commercial: 70 V / 100 V

Definitive Technology Dymension Outdoor BL-550 5.5 in Bollard Speaker, IP56, 84 Hz – 24 kHz, 86 dB, 70 V / 100 V Specifications

Definitive Technology Dymension Outdoor BL-550 technical specifications, grouped by feature

Specification	Details
Acoustic Performance
Tweeter	1 in aluminum oxide dome
Woofer	5.25 in mineral-filled woofer
Frequency Response	84 Hz – 24 kHz (-3 dB); 55 Hz – 32 kHz (-10 dB)
Sensitivity (2.83 V / 1 M)	86 dB
Nominal Impedance	4 ohms (8 ohm compatible)
Connectivity
Input	Jacketed single-cable pigtail; 8 ohm, 70 V, 100 V
Physical & Mounting
Enclosure	Polypropylene with 30% mineral fill
IP Rating	IP56
Available Color	Brown
Dimensions (W x D x H)	10.6 x 9.8 x 17.1 in (270 x 248 x 435 mm)
Product Weight	8.6 lb (3.9 kg)
Additional Features
Pressure-Coupled Bass Radiator	5 x 8 in
General
Brand	Definitive Technology
Model	Dymension Outdoor BL-550
Manufacturer Part Number	BL-550
UPC	747192142568

Specifications are verified against the Definitive Technology manufacturer data sheet (October 2026) and may change without notice. Confirm critical requirements with Definitive Technology before ordering.

Warranty & Support

• Definitive Technology warranty: 5 years

Planning a multi-room or multi-site install? Request a quote from Robertson AV for 5 or more units, or call us at 800-919-6548 or email orders@robertsonav.com. Free ground shipping on U.S. orders. Schools, businesses, government agencies and houses of worship: ask us about project and quantity pricing.