
Optimal Audio
Optimal Audio Cuboid 5TX Passive Loudspeaker 50W 100V
The Optimal Audio Cuboid 5TX is a two-way loudspeaker with an integrated 70V/100V transformer, designed for distributed commercial audio systems. Featuring a 5.25-inch LF driver and 0.75-inch silk dome tweeter with 50W programme power, it delivers clear, full-range sound across long cable runs in bars, restaurants, hotels, and retail environments. Also available in white.50WPower Handling · Programme5.25"LF Driver · Low Frequency0.75"HF Driver · Silk Dome70V / 100VLine Voltage · Transformer70V / 100V TransformerThis TX model includes an integrated 70V/100V line transformer with rotary switch tap selection, allowing you to set the power draw per speaker across a distributed audio system. This makes it straightforward to balance coverage across zones with long cable runs, using a single amplifier channel to drive multiple speakers in parallel.Features5.25" LF driver with 0.75" silk dome HF for smooth, natural reproductionIntegrated 70V/100V transformer with rotary tap selection50W AES at 8 ohms; up to 15W per speaker on a 100V linePortrait or landscape mounting orientationIP54-rated with optional outdoor connector cover (CIPKIT)Compatible with Optimal Audio SmartAmp DSP-optimised amplificationWorks with Zone controllers, ZonePad wall panels, and WebAppBlack finish for unobtrusive integrationNoteThe optional CIPKIT connector cover is required to achieve the full IP54 rating for outdoor or exposed installations. The 5TX can also run at 8 ohms (low impedance) via the rotary switch; the standard Cuboid 5 is the low-impedance-only version.SpecificationsModelCuboid 5TX BlackSKUCUBOID5-BTXSpeaker TypeTwo-Way with 70V/100V TransformerLF Driver5.25"HF Driver0.75" Silk DomePower Handling50WLine Voltage70V / 100VTap SelectionRotary SwitchIngress ProtectionIP54 (with optional connector cover)MountingPortrait / LandscapeFrequency Response97Hz - 20kHz ±3dB, -10dB @ 80Hz (with preset)Peak Power200WNominal Impedance8 ohmsSensitivity (1W/1m)88dBMax SPL @ 1m105dB continuous, 111dB peak (8 ohms)Dispersion (-6dB)130°H x 120°VCrossover2.5kHzRecommended High Pass24dB/octave @ 70HzTransformer Taps @ 70V2.5, 3.75, 5, 7.5WTransformer Taps @ 100V5, 7.5, 10, 15WConnectors4-pin Euroblock (input with link-out terminals)EnclosureABS, painted aluminium grilleFittingsM4 mounting points for wall bracketDimensions (W x H x D)155 x 255 x 150mmWeight2.15kgIn the boxCuboid 5TX loudspeaker, wall bracketColourBlackShow more
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Product details
- Brands
- Optimal Audio
- Categories
- Electronics > Audio > Audio Components > Speakers
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