JBL Professional CSMA-240 - 8-input 2 x 40W Commercial Mixer/Amplifier (70/100V and 4/8 Ω, 1U Fanless)
The JBL Professional CSMA-240 combines a mixer and power amplifier in a highly efficient , 1U fanless form factor for commercial installations. It offers two 40W outputs with operation at low impedance (4/8 Ω) or on 70/100V distributed lines without external transformers, thanks to Hi-Z switching with an automatic 70Hz high-pass filter . Its minimalist front panel makes it easy for non-technical personnel to use: per-channel volume control with illuminated rings, master volumes per zone, and Bass/Treble EQ per output. The rear panel features eight inputs (balanced Euroblock and stereo RCA summed to mono on CH2–CH8), contact priority and VOX on channels 1 and 5, AUX outputs for each amplifier, and an RJ-45 port for a CSR-V wall-mounted volume control. The Crown DriveCore™ platform provides energy efficiency and continued reliability, with Energy Star certification for reduced power consumption and heat.
Main features
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Output power : 2 × 40 W per channel into 4/8 Ω (1 kHz, THD+N ≤ 0.5%); 70/100 V outputs with insertion loss ≤ 1 dB.
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Inputs : 8 total channels. Balanced Euroblock on all channels; stereo RCA on CH2–CH8 (sum to mono).
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Announcement functions : Contact priority and VOX ducking on CH1 and CH5 , with rear threshold adjustment.
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Flexible routing : assigning inputs to AMP1 and/or AMP2 using DIP switches (default configuration CH1–4→AMP1 and CH5–8→AMP2).
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Connectivity : RJ-45 port for CSR-V (zone remote volume control); independent AUX line outputs for each amplifier.
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Audio : response 20 Hz–20 kHz (4/8 Ω) / 80 Hz–15 kHz (70/100 V); SNR > 90 dB ; THD < 0.5% (power), 0.05% typical (line output).
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Phantom power : 27V switchable for microphone inputs.
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Design : 1U fanless, DriveCore™ efficiency, Energy Star certified, rack kit included.
Product benefits
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Two real zones with Bass/Treble control and equalization per output, and configurable input routing for each amplifier.
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Versatile installation : Low Z or 70/100 V in the same unit; Hi-Z activation via DIP with automatic HPF to protect the distributed network.
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Simple operation : clear front controls and illuminated rings; priority and VOX for clear messages over the music.
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Efficiency and reliability : DriveCore™ architecture and fanless design for continuous operation with low power consumption.
Use cases
- Retail, hospitality and catering: background music and announcements by area.
- Education and corporate: classrooms, meeting rooms, hallways and reception areas.
- Fitness centers, museums and public spaces with local level control (CSR-V).
Frequently Asked Questions
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How do I switch to 70/100 V? Activate Hi-Z on the DIP switches (AMP1 and/or AMP2). A 70 Hz high-pass filter is automatically applied.
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Can I send the same source to both zones? Yes. Using the Input Routing DIP switches, you can assign any channel to AMP1 , AMP2 , or both.
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Does it support wall control? Yes, via the RJ-45 port with a CSR-V panel (zone volume).
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Can low Z and 70/100 V be mixed on the same output? No. Each output must operate either at low Z or high Z.
Project description
JBL CSMA-240 Mixer/Amplifier: 2 × 40 W @ 4/8 Ω (1 kHz, ≤ 0.5% THD); switchable 70/100 V outputs ( Hi-Z , HPF 70 Hz , ≤ 1 dB insertion loss). 8 inputs : balanced Euroblock on all channels and stereo RCA on CH2–CH8 (sum to mono); priority and VOX on CH1/CH5; AUX outputs per amplifier; 27 V phantom power ; SNR > 90 dB ; frequency response 20 Hz–20 kHz (4/8 Ω) / 80 Hz–15 kHz (70/100 V); sensitivities: Mic 3 mVrms, Line 0.775 Vrms, RCA 0.300 Vrms; Impedances: Mic 400 Ω, Line 20 kΩ (balanced), RCA 50 kΩ; minimum load: 4 Ω (low Z), 120 Ω @ 70 V , 240 Ω @ 100 V ; CSR-V remote control via RJ-45 ; dimensions 43.3 × 436.9 × 303.4 mm ; net weight 4.8 kg (shipping 6.3 kg ); 1U fanless design with DriveCore™ technology.
