{"product_id":"toa-da-550f-cu","title":"TOA DA-550F CU 4-Channel Class-D Rack Power Amplifier","description":"\u003cp\u003eThe TOA DA-550F CU is engineered for demanding installed sound and production environments where multi-channel power distribution, remote monitoring, and reliable long-term operation are non-negotiable. Its Class-D topology and switching power supply make it practical for racks where thermal management and weight are real constraints — integrators gain high output density without sacrificing control flexibility.\u003c\/p\u003e\u003cp\u003eEach of the four channels operates from an independent power section, meaning a fault or bridged configuration on one pair has no effect on the remaining pair. The RJ-45 control\/monitor terminals allow facility automation systems or custom control panels to switch individual channels on or off and report protection and fan status over runs up to 600 meters — a capability that distinguishes this amplifier in distributed system designs where the amp rack is not co-located with the operator position.\u003c\/p\u003e\u003cp\u003eFront-panel recessed attenuators with optional security covers prevent accidental level changes after commissioning, and removable dust filters service without pulling the unit from the rack. A 2-second turn-on relay delay suppresses noise at the loudspeaker outputs during power cycling, which matters in permanently installed systems running sensitive transducers. Stack up to five units in a single rack without thermal spacing, and select per-pair bridging independently — giving system designers the configuration flexibility to match different loudspeaker loads across zones without additional hardware.\u003c\/p\u003e","brand":"TOA ELECTRONICS, INC","offers":[{"title":"Default Title","offer_id":53768187216056,"sku":"207562","price":3294.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0871\/7382\/4696\/files\/207562_DA-550F-CU_ALT01sqr.jpg?v=1784233976","url":"https:\/\/soundpro.com\/products\/toa-da-550f-cu","provider":"SoundPro","version":"1.0","type":"link"}