JBL CSM28 Commercial Mixer/Amplifier

JBL Professional CSM28 - 8x2 Commercial Mixer for Two Zones, Fanless 1U (No Power Amplifier)

The JBL Professional CSM28 is an 8-input , 2-output analog installation mixer designed for use in BGM, announcements, and PA applications in restaurants, retail, gyms, schools, offices, and houses of worship . It offers independent channel level control , priority control , and VOX ducking on dedicated channels, plus zone-level bass/treble EQ . Its full 1U rackmount fanless design and GreenEdge™ standards-compliant electronics deliver reliability and efficiency in 24/7 environments.

It features balanced Euroblock inputs (switchable mic/line and +27 V phantom power) and unbalanced RCA (mono summation per channel), and Euroblock line outputs ; it does not incorporate power amplification. DIP switching allows zone routing for each channel, 70 Hz HPF filters per output, and global phantom power activation. For wall control, it integrates RJ45 ports compatible with JBL CSR-V for remote volume adjustment for each zone up to 305 m (Cat5).

Main features

• 8×2 Architecture : Eight inputs to two zones with master control and bass/treble EQ (±10 dB) per output.
• Flexible DIP routing : assign inputs to OUT1/OUT2, HPF 70 Hz per output, and switchable +27 V phantom .
• Priority & VOX Ducking : Dedicated channels with push-to-talk (PTT) priority and adjustable VOX for clear messages over music.
• Professional connectivity : balanced Euroblock inputs + RCA per channel; Euroblock line outputs.
• Wall-mounted remote : RJ45 ports for CSR-V (volume per zone, Cat5 cable up to 305 m).
• Audio Performance : 20 Hz–20 kHz (±1 dB) , THD 0.05 % typical, S/N > 90 dB , crosstalk > 70 dB .
• Easy installation : 1U chassis (43.3 × 437 × 303.4 mm), rack ear kit included , 100–240 V~ power supply.

Product benefits

• Intuitive operation : Illuminated level rings, simple EQ and priority logic streamline the daily work of non-technical personnel.
• Two real zones : DIP routing to send exactly the necessary sources to each area, with HPF per output to protect systems.
• Scalability : Line outputs ready to pair with commercial amplifiers and mixers (e.g. Crown/JBL CSMA/CSA).
• 24/7 Reliability : Fanless design, universal 100–240 V and construction for fixed installation.

Use cases

• Restaurants and shops: BGM with priority notifications at the checkout/reception desk and wall-mounted controls by zone.
• Gyms and fitness centers: music mix and instructor mic with VOX ducking.
• Schools, churches, and community halls: Clear announcements with priority and distribution to two areas.

Frequently Asked Questions

• Does it include amplification for 70/100 V speakers? No. The CSM28 is a mixer only (line output). It requires external power amps/mixer amplifiers.
• Can I assign each source to a zone? Yes. DIP switches allow you to send inputs to OUT1, OUT2, or both, and apply HPF per output.
• Which channels have priority/VOX? On the CSM28, CH1 (for OUT1 or both if routed) and CH5 (over OUT2) have priority and VOX with rear adjustment.
• Which wall control is compatible? CSR-V (RJ45/Cat5) for zone volume; cabling up to 305 m .
• Does it come with rack ears? Yes, it comes with a rack-mount kit as standard.

Description for projects

JBL CSM28 commercial mixer, 8 inputs / 2 outputs . Inputs: Euroblock balanced mic/line switchable (phantom +27 V global), and RCA per channel (mono sum); contact priority and VOX on CH1 and CH5. Outputs: Euroblock line (2), HPF 70 Hz switchable per output. DIP routing of channels to zones. Performance: 20 Hz–20 kHz (±1 dB) , THD 0.05 % , S/N > 90 dB , output level 5 Vrms . Remote control: CSR-V via RJ45 . Power supply 100–240 V~, 50/60 Hz . 1U chassis (43.3 × 437 × 303.4 mm) , weight 3.4 kg .