{"product_id":"sonifex-cm-bh4w-belt-pack-4-wire-headphone-amp","title":"Sonifex CM-BH4W | Belt-Pack 4-Wire Headphone Amp","description":"\u003cp\u003eThe CM-BH4W is a portable, battery powered 4 wire communication unit for use in a multitude of TV and radio broadcasting applications. This uses audio transformers at its input and output, providing galvanic isolation from outside interference, ensuring your communications are loud and clear, every time. In 4-wire mode, the unit acts as a 2-way intercom, with input audio routed to the headset earpiece, and microphone audio is routed to the output upon pressing the talk button. The output level is maintained at +2dBu peak level by a built-in AGC. In IFB mode, the input audio is routed to the output, and is interrupted by the microphone signal when the talk switch is pressed. The talk switch can easily be converted from momentary to latching operation to suit your application. A low battery warning LED flashes when the 9V PP3 battery has depleted to 6V, giving plenty of notice to swap the battery. In addition, the CM-BH4W automatically switches off when the headset jack is removed, and the low power circuitry gives up to 150 hours use from a single alkaline 9V PP3 battery. Transformer balanced inputs \u0026amp; outputs.\u003c\/p\u003e\u003ch3\u003eProduct Features\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eTransformer balanced inputs \u0026amp; outputs.\u003c\/li\u003e\n\u003cli\u003e4-wire and IFB modes.\u003c\/li\u003e\n\u003cli\u003eLow battery warning indicator.\u003c\/li\u003e\n\u003cli\u003e150 hours from a single 9V PP3 battery.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eTypical Applications\u003c\/h3\u003e\u003cp\u003eUsed in TV studio floors, sports grounds and arenas by presenters and cameramen to produce content and to hear talkback.\u003c\/p\u003e\u003ch3\u003eProduct Category\u003c\/h3\u003e\u003cp\u003eBelt Packs\u003c\/p\u003e\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\u003ch4\u003eMic In to Line Out\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMic Input Impedance:\u003c\/strong\u003e 1k5Ω Unbalanced for 200Ω dynamic microphone\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLimiter Input Threshold:\u003c\/strong\u003e -60dBu\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLine Output Level:\u003c\/strong\u003e +2dBu\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLine Output Impedance:\u003c\/strong\u003e 150Ω Transformer balanced\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eLine In to Headphone Out\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eLine Input Impedance:\u003c\/strong\u003e \u0026gt;10kΩ Transformer balanced\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInput Gain\/Volume:\u003c\/strong\u003e Adjustable off to +10dB\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaximum Input Level:\u003c\/strong\u003e +24dBu\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaximum HP Output Level:\u003c\/strong\u003e +7dBu (ref 9V battery voltage, \u0026lt;1% THD, 100Ω load)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMinimum HP Impedance:\u003c\/strong\u003e 100Ω\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eConnections\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eLine Input:\u003c\/strong\u003e 1 x XLR 3 pin female socket (balanced)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLine Output:\u003c\/strong\u003e 1 x XLR 3 pin male plug (balanced)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHeadset (CM-BH4W):\u003c\/strong\u003e 1 x ¼” (6.35mm) mono unbalanced jack socket\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eEquipment Type\u003c\/h4\u003e\u003cul\u003e\u003cli\u003e\n\u003cstrong\u003eCM-BH4W:\u003c\/strong\u003e Belt-pack 4-wire headphone amplifier\u003c\/li\u003e\u003c\/ul\u003e\u003ch4\u003ePhysical Specification\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDimensions (Raw):\u003c\/strong\u003e 12.5cm (W) x 6.7cm (D) x 4.8cm (H)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDimensions (Raw):\u003c\/strong\u003e 4.9” (W) x 2.6” (D) x 1.9” (H)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDimensions (Boxed):\u003c\/strong\u003e 23cm (W) x 13cm (D) x 8cm (H)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDimensions (Boxed):\u003c\/strong\u003e 9.1” (W) x 5.1” (D) x 3.1” (H)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e Nett: 0.3kg Gross: 0.4kg\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e Nett: 0.6lbs Gross: 1.0lbs\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eSupport and Downloads\u003c\/h3\u003e\u003ch4\u003eHandbooks \u0026amp; Guides\u003c\/h4\u003e\u003cul\u003e\u003cli\u003e\u003ca href=\"https:\/\/ad56550c.delivery.rocketcdn.me\/wp-content\/uploads\/products\/CM-BH4W\/cm-bh4w_hb.pdf\" target=\"_blank\" rel=\"noopener noreferrer\"\u003eCM-BH4W Handbook\u003c\/a\u003e\u003c\/li\u003e\u003c\/ul\u003e\u003ch4\u003eBrochures\u003c\/h4\u003e\u003cul\u003e\u003cli\u003e\u003ca href=\"https:\/\/sonifex.co.uk\/brochures-guides\" target=\"_blank\" rel=\"noopener noreferrer\"\u003eClick to visit the brochures page.\u003c\/a\u003e\u003c\/li\u003e\u003c\/ul\u003e\u003ch4\u003eDeclarations\u003c\/h4\u003e\u003cul\u003e\u003cli\u003e\u003ca href=\"https:\/\/sonifex.co.uk\/support\/ce-ukca-declarations\" target=\"_blank\" rel=\"noopener noreferrer\"\u003eClick to visit the declarations page.\u003c\/a\u003e\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eRelated Products\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/sonifex.co.uk\/product\/cm-bh4wx\" target=\"_blank\" rel=\"noopener noreferrer\"\u003eCM-BH4WX Belt-Pack 4-Wire Headphone Amp\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/sonifex.co.uk\/product\/cm-bha\" target=\"_blank\" rel=\"noopener noreferrer\"\u003eCM-BHA Belt Pack Headphone Amplifier with Limiter \u0026amp; Loudspeaker\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/sonifex.co.uk\/product\/cm-tb8\" target=\"_blank\" rel=\"noopener noreferrer\"\u003eCM-TB8 8 Channel Talkback Control Unit\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eOfficial Links\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e\u003ca href=\"https:\/\/sonifex.co.uk\/product\/cm-bh4w\" target=\"_blank\" rel=\"noopener noreferrer\"\u003eOfficial Product Page\u003c\/a\u003e\u003c\/li\u003e\u003c\/ul\u003e","brand":"Sonifex","offers":[{"title":"Default Title","offer_id":53670419661141,"sku":"CM-BH4W","price":421.96,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1033\/6993\/3141\/files\/Sonifex_Sonifex_CM_BH4W_Belt_Pack_4_Wire_Headphone_Amp_01.jpg?v=1780656653","url":"https:\/\/tvpro.lt\/products\/sonifex-cm-bh4w-belt-pack-4-wire-headphone-amp","provider":"tvpro.lt – Broadcast \u0026 Pro Video Equipment Online Store","version":"1.0","type":"link"}