{"product_id":"hertz-sp4-900-4-channel-d-class-car-amplifier","title":"Hertz SP4-900 4-Channel D-Class Car Amplifier","description":"\u003cp\u003eThe Hertz SP4-900 is a compact four-channel car audio amplifier designed to add substantial, configurable power where installation space is limited. It can run four speakers, a front speaker pair with a bridged subwoofer channel, or two bridged speaker\/subwoofer loads. Its IP55-rated enclosure and sealed connections make it especially relevant for vehicles and powersports applications exposed to humidity, vibration, or dust.\u003c\/p\u003e\u003cp\u003eAt 14.4V, the SP4-900 delivers 160 watts RMS to each of four 4-ohm channels or 250 watts RMS per channel at 2 ohms. For systems needing more output from fewer channels, it can be bridged to provide 500 watts RMS x 2 at 4 ohms. This flexibility supports upgrades ranging from amplified component speakers and coaxials to a speaker-and-subwoofer arrangement.\u003c\/p\u003e\u003cp\u003eThe amplifier uses Hertz ADC, an Advanced D-Class output stage specified for up to 85% efficiency. Its published noise, distortion, and damping specifications support a clean, controlled signal path for properly matched speakers. A fanless layout avoids an internal cooling fan, helping reduce the buildup of dirt inside the chassis.\u003c\/p\u003e\u003cp\u003eFactory-system integration is supported through both pre-level and speaker-level inputs. Hertz USS, or Universal Speakers Simulator, is built into the high-level input section to help the amplifier work with head units that monitor connected speaker loads. It also supports remote turn-on through a conventional remote input or DC sensing from compatible BTL speaker outputs.\u003c\/p\u003e\u003cp\u003eIndependent channel-pair crossover controls allow the SP4-900 to be configured for full-range, high-pass, or low-pass operation. Both channel pairs offer 50 Hz to 5 kHz filters with 12 dB-per-octave slopes, while channels 3-4 add adjustable 45 Hz bass boost when low-pass mode is selected. The compact footprint fits under-seat, behind-seat, motorcycle, and other space-conscious installations when mounted with appropriate ventilation.\u003c\/p\u003e\u003ch3\u003eKey Features\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFour-Channel D-Class Design:\u003c\/strong\u003e Supplies configurable power for speakers, subwoofers, or mixed systems.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e160W RMS Per Channel:\u003c\/strong\u003e Delivers rated four-channel output into 4-ohm speakers.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e2-Ohm Stable Channels:\u003c\/strong\u003e Provides up to 250W RMS per channel at 2 ohms.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBridgeable Outputs:\u003c\/strong\u003e Produces 500W RMS x 2 into 4-ohm loads.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUSS High-Level Integration:\u003c\/strong\u003e Helps maintain compatibility with speaker-load-detecting factory radios.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIP55 Aluminum Chassis:\u003c\/strong\u003e Adds protection against dust and water ingress.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eDesign \u0026amp; Installation\u003c\/h3\u003e\u003cp\u003eThe SP4-900 uses an aluminum IP55-rated chassis, sealed power, line-input, and speaker-output connections, plus a conformal-coated main board intended to resist harm from internal condensation. A removable aluminum control cover protects the adjustment section, and all crossover controls are grouped on one side for easier access after installation. The fanless design eliminates a cooling fan that could draw dirt into the amplifier.\u003c\/p\u003e\u003cp\u003eInstall the amplifier in a 12V negative-ground vehicle or boat electrical system, using the included power-supply and speaker-output harnesses. Select low-level input mode for pre-out signals or high-level USS mode for speaker-output signals, then choose 2-channel or 4-channel input routing as needed. Mount it in a ventilated location with clearance around the chassis, keep it out of the engine compartment, and observe the rated minimum impedance for the selected channel configuration.\u003c\/p\u003e","brand":"Hertz","offers":[{"title":"Default Title","offer_id":45631858606150,"sku":"SP4-900","price":872.1,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0048\/4163\/5910\/files\/71xVI0Q34WL.jpg?v=1784383950","url":"https:\/\/audiowatt.store\/products\/hertz-sp4-900-4-channel-d-class-car-amplifier","provider":"Audio Watt Store","version":"1.0","type":"link"}