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CD-181A

Overview

OPRA CD-181A is a high-performance subwoofer designed for ground-stack applications, equipped with an 18-inch long-excursion driver and featuring a bass-reflex design.


When used in groups of three or multiples of three, the CD-181A can form a cardioid subwoofer array. By placing one enclosure rear-facing and driving it with amplifiers supporting OPRA A+ software, precise low-frequency directivity control is achieved, greatly reducing rear sound radiation.


The enclosure is constructed of high-strength marine plywood, finished with IP56-rated impact-resistant and weather-resistant water-based coating. It has a front metal grille with acoustically transparent foam, side handles for easy transport, and four rubber feet at the bottom to prevent scuffing.


The top panel is fitted with an M20 threaded flange, compatible with OPRA speaker stands and stand winders. An optional waterproof transport cover is also available to fully protect the front of the subwoofer during transit.

Technical Data

System Data

Frequency response (-5 dB standard) ：

37 Hz - 140 Hz
Frequency response (-5 dB 100 Hz mode) ：
37 Hz - 110 Hz
Frequency response (–5 dB INFRA mode) ：
35 Hz - 80 Hz

Max. sound pressure ：
with OPRA TTM8K4 / OPRA 4412    128 dB
with OPRA TTM12K4/OPRA Aura 8   130 dB
with OPRA X4/ X8 / X4L   132 dB

Cabinets per amplifier channel ：

1




Loudspeaker Data

Configuration ：
High performance subwoofer

Nominal impedance
8 Ω

Power handling capacity (RMS/peak 10 ms)
500/2000 W

Components ：
1 x 18" driver

Connections ：
2 x NLT4 F/M
SUB 1+ 1-
    /    2+ 2-



Dimensions / weight

Dimensions (h x w x d) ：
865 x 700 x 715 mm

34.06 x 27.56 x 28.15 "


Weight ：
41 kg

90.39 lb




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