{"product_id":"jbl-csm-21-public-address-mixer-2-stereo-input-1-output-digital-mixer-with-paging-ducking-and-subwoofer-output","title":"JBL CSM-21 Public Address Mixer – 2 Stereo Input \/ 1 Output Digital Mixer with Paging, Ducking, and Subwoofer Output","description":"\u003cp data-start=\"154\" data-end=\"464\"\u003eThe \u003cstrong data-start=\"158\" data-end=\"172\"\u003eJBL CSM-21\u003c\/strong\u003e is a compact digital commercial mixer designed for background music and paging applications in retail, hospitality, conferencing, and corporate environments. As part of JBL’s Commercial Series Mixers (CSM), it provides flexible signal routing and simple control without requiring a computer.\u003c\/p\u003e\n\u003cp data-start=\"466\" data-end=\"836\"\u003eFeaturing a \u003cstrong data-start=\"478\" data-end=\"528\"\u003e2 stereo input + 1 stereo output configuration\u003c\/strong\u003e, the CSM-21 allows seamless integration of multiple music sources along with a dedicated microphone input for announcements. It also includes an additional \u003cstrong data-start=\"685\" data-end=\"708\"\u003epriority line input\u003c\/strong\u003e, enabling emergency or alarm signals to override all other audio sources when required. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-start=\"838\" data-end=\"1098\"\u003eA key highlight is its \u003cstrong data-start=\"861\" data-end=\"922\"\u003ebuilt-in active crossover with dedicated subwoofer output\u003c\/strong\u003e, allowing easy integration of a subwoofer without external processing. This makes it more advanced than basic mixers in the CSM lineup. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-start=\"1100\" data-end=\"1455\"\u003eThe system includes \u003cstrong data-start=\"1120\" data-end=\"1135\"\u003eVOX ducking\u003c\/strong\u003e, automatically lowering background music during microphone announcements—critical for paging systems. It also features JBL technologies like \u003cstrong data-start=\"1277\" data-end=\"1320\"\u003eLevelGuard™ (consistent volume control)\u003c\/strong\u003e and \u003cstrong data-start=\"1325\" data-end=\"1380\"\u003eAutoWarmth™ (maintains tonal balance at low levels)\u003c\/strong\u003e for improved listening experience. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-start=\"1457\" data-end=\"1632\"\u003eDesigned for real-world installations, the CSM-21 supports \u003cstrong data-start=\"1516\" data-end=\"1540\"\u003eCSR wall controllers\u003c\/strong\u003e, \u003cstrong data-start=\"1542\" data-end=\"1569\"\u003eCSPM paging microphones\u003c\/strong\u003e, and \u003cstrong data-start=\"1575\" data-end=\"1591\"\u003eRJ45 linking\u003c\/strong\u003e to expand systems across multiple zones.\u003c\/p\u003e\n\u003cp data-start=\"1634\" data-end=\"1767\"\u003e⚠️ Note: This model is now \u003cstrong data-start=\"1661\" data-end=\"1677\"\u003ediscontinued\u003c\/strong\u003e, but still widely used in existing installations. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003chr data-start=\"1769\" data-end=\"1772\"\u003e\n\u003ch2 data-section-id=\"m1vap0\" data-start=\"1774\" data-end=\"1800\"\u003ePerformance Highlights:\u003c\/h2\u003e\n\u003cp data-start=\"1801\" data-end=\"2103\"\u003e• 2 stereo inputs + mic + priority input for flexible source control\u003cbr data-start=\"1869\" data-end=\"1872\"\u003e• Stereo output with dedicated subwoofer output (built-in crossover)\u003cbr data-start=\"1940\" data-end=\"1943\"\u003e• VOX ducking for paging and announcements\u003cbr data-start=\"1985\" data-end=\"1988\"\u003e• LevelGuard™ and AutoWarmth™ for consistent audio quality\u003cbr data-start=\"2046\" data-end=\"2049\"\u003e• Expandable via RJ45 linking for multi-zone systems\u003c\/p\u003e\n\u003chr data-start=\"2105\" data-end=\"2108\"\u003e\n\u003ch2 data-section-id=\"1071k5m\" data-start=\"2110\" data-end=\"2144\"\u003eWhy You Should Buy This Product\u003c\/h2\u003e\n\u003cp data-start=\"2146\" data-end=\"2438\"\u003e• ⭐ Advanced mixer with subwoofer output (rare in this category)\u003cbr data-start=\"2210\" data-end=\"2213\"\u003e• ⭐ Ideal for paging + music systems with priority control\u003cbr data-start=\"2271\" data-end=\"2274\"\u003e• ⭐ No PC\/software required – simple front-panel operation\u003cbr data-start=\"2332\" data-end=\"2335\"\u003e• ⭐ Expandable system via linking (multi-zone capable)\u003cbr data-start=\"2389\" data-end=\"2392\"\u003e• ⭐ Reliable JBL commercial-grade processing\u003c\/p\u003e\n\u003chr data-start=\"2440\" data-end=\"2443\"\u003e\n\u003ch2 data-section-id=\"1ma7m6t\" data-start=\"2445\" data-end=\"2460\"\u003eKey Features\u003c\/h2\u003e\n\u003cp data-start=\"2462\" data-end=\"2984\"\u003e• 2 stereo music inputs (RCA) with gain control\u003cbr data-start=\"2509\" data-end=\"2512\"\u003e• 1 microphone input with phantom power\u003cbr data-start=\"2551\" data-end=\"2554\"\u003e• 1 priority line input (alarm\/emergency override)\u003cbr data-start=\"2604\" data-end=\"2607\"\u003e• 1 stereo output + dedicated subwoofer output\u003cbr data-start=\"2653\" data-end=\"2656\"\u003e• Built-in active crossover (HPF + LPF)\u003cbr data-start=\"2695\" data-end=\"2698\"\u003e• Bass \u0026amp; treble EQ (music + mic separate)\u003cbr data-start=\"2739\" data-end=\"2742\"\u003e• VOX ducking and priority muting\u003cbr data-start=\"2775\" data-end=\"2778\"\u003e• LevelGuard™ and AutoWarmth™ processing\u003cbr data-start=\"2818\" data-end=\"2821\"\u003e• RJ45 link ports for system expansion\u003cbr data-start=\"2859\" data-end=\"2862\"\u003e• CSR wall controller compatibility\u003cbr data-start=\"2897\" data-end=\"2900\"\u003e• Contact closure control (paging\/muting)\u003cbr data-start=\"2941\" data-end=\"2944\"\u003e• Security cover plate for front panel\u003c\/p\u003e\n\u003chr data-start=\"2986\" data-end=\"2989\"\u003e\n\u003ch2 data-section-id=\"58xi60\" data-start=\"2991\" data-end=\"3020\"\u003eTechnical Specifications\u003c\/h2\u003e\n\u003ch3 data-section-id=\"1b952b4\" data-start=\"3022\" data-end=\"3033\"\u003eGeneral\u003c\/h3\u003e\n\u003cp data-start=\"3035\" data-end=\"3139\"\u003e• Product Type: Public Address Digital Mixer\u003cbr data-start=\"3079\" data-end=\"3082\"\u003e• Brand: JBL\u003cbr data-start=\"3094\" data-end=\"3097\"\u003e• Model: CSM-21\u003cbr data-start=\"3112\" data-end=\"3115\"\u003e• Status: Discontinued\u003c\/p\u003e\n\u003chr data-start=\"3141\" data-end=\"3144\"\u003e\n\u003ch3 data-section-id=\"jt44pa\" data-start=\"3146\" data-end=\"3169\"\u003eAudio \u0026amp; Performance\u003c\/h3\u003e\n\u003cp data-start=\"3171\" data-end=\"3401\"\u003e• Frequency Response: 20 Hz – 20 kHz (±0.1 dB) \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003cbr data-start=\"3255\" data-end=\"3258\"\u003e• Dynamic Range: ~104 dB \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003cbr data-start=\"3320\" data-end=\"3323\"\u003e• THD: ~0.005% \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003cbr data-start=\"3375\" data-end=\"3378\"\u003e• Sample Rate: 48 kHz\u003c\/p\u003e\n\u003chr data-start=\"3403\" data-end=\"3406\"\u003e\n\u003ch3 data-section-id=\"nbnrr7\" data-start=\"3408\" data-end=\"3418\"\u003eInputs\u003c\/h3\u003e\n\u003cp data-start=\"3420\" data-end=\"3558\"\u003e• Music Inputs: 2 × Stereo RCA\u003cbr data-start=\"3450\" data-end=\"3453\"\u003e• Mic Input: 1 × Euroblock (with phantom power)\u003cbr data-start=\"3500\" data-end=\"3503\"\u003e• Priority Input: 1 × Line input (for alarm\/override)\u003c\/p\u003e\n\u003chr data-start=\"3560\" data-end=\"3563\"\u003e\n\u003ch3 data-section-id=\"et0zxm\" data-start=\"3565\" data-end=\"3576\"\u003eOutputs\u003c\/h3\u003e\n\u003cp data-start=\"3578\" data-end=\"3738\"\u003e• Main Output: 1 × Stereo (Euroblock)\u003cbr data-start=\"3615\" data-end=\"3618\"\u003e• Subwoofer Output: 1 × Mono (dedicated, summed)\u003cbr data-start=\"3666\" data-end=\"3669\"\u003e• Output Level: Up to +20 dBu \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003chr data-start=\"3740\" data-end=\"3743\"\u003e\n\u003ch3 data-section-id=\"1ts5j2l\" data-start=\"3745\" data-end=\"3759\"\u003eProcessing\u003c\/h3\u003e\n\u003cp data-start=\"3761\" data-end=\"3919\"\u003e• DSP: Yes (digital processing with analog-style control)\u003cbr data-start=\"3818\" data-end=\"3821\"\u003e• Crossover: Built-in (125 Hz HPF \/ LPF) \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003cbr data-start=\"3899\" data-end=\"3902\"\u003e• Equalization:\u003c\/p\u003e\n\u003cul data-start=\"3922\" data-end=\"4104\"\u003e\n\u003cli data-section-id=\"6uny1v\" data-start=\"3922\" data-end=\"3963\"\u003eMusic EQ: Bass ±10 dB \/ Treble ±10 dB\u003c\/li\u003e\n\u003cli data-section-id=\"1ron058\" data-start=\"3966\" data-end=\"4104\"\u003eMic EQ: Bass ±6 dB \/ Treble ±6 dB\u003cbr data-start=\"4001\" data-end=\"4004\"\u003e• Ducking: Yes (adjustable VOX)\u003cbr data-start=\"4035\" data-end=\"4038\"\u003e• Priority Muting: Yes\u003cbr data-start=\"4060\" data-end=\"4063\"\u003e• LevelGuard™: Yes\u003cbr data-start=\"4081\" data-end=\"4084\"\u003e• AutoWarmth™: Yes\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"4106\" data-end=\"4109\"\u003e\n\u003ch3 data-section-id=\"bbkx2b\" data-start=\"4111\" data-end=\"4127\"\u003eConnectivity\u003c\/h3\u003e\n\u003cp data-start=\"4129\" data-end=\"4283\"\u003e• Control Ports: RJ45 (CSR wall controller)\u003cbr data-start=\"4172\" data-end=\"4175\"\u003e• Link Ports: RJ45 (multi-unit linking via Cat5)\u003cbr data-start=\"4223\" data-end=\"4226\"\u003e• Logic Inputs: Contact closure (paging \/ mute control)\u003c\/p\u003e\n\u003chr data-start=\"4285\" data-end=\"4288\"\u003e\n\u003ch3 data-section-id=\"v033e1\" data-start=\"4290\" data-end=\"4317\"\u003ePhysical \u0026amp; Installation\u003c\/h3\u003e\n\u003cp data-start=\"4319\" data-end=\"4555\"\u003e• Form Factor: Rack-mount (1U)\u003cbr data-start=\"4349\" data-end=\"4352\"\u003e• Dimensions: ~48.3 × 4.6 × 17.8 cm \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003cbr data-start=\"4425\" data-end=\"4428\"\u003e• Weight: ~2.4 kg \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003cbr data-start=\"4485\" data-end=\"4488\"\u003e• Power Consumption: ~10W \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003chr data-start=\"4557\" data-end=\"4560\"\u003e\n\u003ch3 data-section-id=\"k34kmu\" data-start=\"4562\" data-end=\"4579\"\u003eConfiguration\u003c\/h3\u003e\n\u003cp data-start=\"4581\" data-end=\"4721\"\u003e• System Type: Digital mixer (pre-amplifier stage)\u003cbr data-start=\"4631\" data-end=\"4634\"\u003e• Channels: 1 stereo zone\u003cbr data-start=\"4659\" data-end=\"4662\"\u003e• Amplifier: ❌ Not included (requires external amplifier)\u003c\/p\u003e\n\u003chr data-start=\"4723\" data-end=\"4726\"\u003e\n\u003ch3 data-section-id=\"v6ee9q\" data-start=\"4728\" data-end=\"4740\"\u003eIncluded\u003c\/h3\u003e\n\u003cp data-start=\"4742\" data-end=\"4870\"\u003e• 1 × Public Address Mixer\u003cbr data-start=\"4768\" data-end=\"4771\"\u003e• 1 × Power Supply\u003cbr data-start=\"4789\" data-end=\"4792\"\u003e• 1 × Rack Mount Kit\u003cbr data-start=\"4812\" data-end=\"4815\"\u003e• 1 × Security Cover Plate\u003cbr data-start=\"4841\" data-end=\"4844\"\u003e• 1 × User Documentation\u003c\/p\u003e","brand":"JBL","offers":[{"title":"Default Title","offer_id":52850468127039,"sku":"JBL CSM-21","price":75900.0,"currency_code":"INR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0014\/5942\/1272\/files\/CSM-21-Front_large_b47dd89f-a3b5-4273-a394-2d8ac49f534f.jpg?v=1777044909","url":"https:\/\/audiomaxx.in\/products\/jbl-csm-21-public-address-mixer-2-stereo-input-1-output-digital-mixer-with-paging-ducking-and-subwoofer-output","provider":"Audiomaxx India","version":"1.0","type":"link"}