Optima B315

Compact high power bass enclosure

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Product Overview

The Optima B315 is a compact high power bass enclosure.


• Components: 3 x 15″

• Frequency Response: 40 – 135 Hz
• Directivity: Omni-directional
• Max SPL:  142 dB
• Weight: 94 kg

Optima B315 Product Description

The Optima B315 is a compact high- power bass enclosure designed to operate over the 40 – 135 Hz pass band. The enclosure is a special-order product, conceived as an alternative to Ethos B215, where there is no ground-stacked sub-bass element to the system. The Optima B315 can be flown above a hang of Optima 8, or flown as an independent bass hang.


The cabinet combines three off 15” long excursion cone drivers with neodymium magnet structures loaded into a twin chamber band pass structure.


The enclosure is manufactured from 18 mm birch plywood and coated in a heavy duty polyurea finish. The cabinet front has a protective steel grill coated in a water-resistant powder coat finish which has an acoustically transparent filter medium bonded to its back surface. The enclosure has a four-point fly system that allows connection of box to box, or box to fly frame. Each cabinet has four handles and the option of castors mounted directly to the rear panel.

The cabinet base has polyethylene runners and the cabinet top panel housings to aid stacking cabinets in vertical columns.


Electrical connection to the cabinet is via two parallel linked Neutrik NL4 connectors on the rear panel.


All Inspired Audio products are designed as an integrated solution complete with system amplifier options from the Eflex range. The Eflex units provide DSP preset functions, networked software control of operating parameters and output drive power. A channel of an Eflex Q20 system amplifier will drive a single Optima B315 enclosure.

Made In Britain 300px WHT

Optima B315 Specification

3 off 15″ cone driver

Frequency response:
40 – 135 Hz

Sensitivity: 2.8 V/1m (Peak):
Bass – 106 dB (142 dB)

Power (RMS/Peak):
Bass – 3000 w (12000 w)

2.7 ohms


Operation mode:
Active pass band

3 off Neutrik NL4 MP

Wiring protocol:
1+/1- = Input
2+/2- = N/C

Weight (Packaged): 
94 kg (100 kg)

Dimensions (mm): 
748w x 590 x 760d

Optima B315 Downloads

Specification Sheet

Optima B315 Elements

Optima B315

Flown Bass


The Optima B315 is a compact high power triple 15″ flown bass enclosure.

Optima 8

Array Element


The Optima 8 is a compact high powered vertically arraying loudspeaker enclosure.

Eflex Q20

System Amplification


The eFlex range of advanced DSP amplifiers powers our entire product range.