Hertz SP 4.500 is a compact Class-D 4-channel amplifier from the SPL Show series, built for high-efficiency installs where space, durability, and clean output matter. It’s designed to run front/rear speakers from a single chassis, with flexible 4CH/3CH/2CH operating modes. In 4-channel mode, the SP 4.500 delivers 90W RMS x4 @4Ω or 150W RMS x4 @2Ω (14.4V, 1% THD). It also supports 3-channel and 2-channel bridged configurations using manufacturer-published power ratings, making it a practical “one amp” solution when wiring and space are tight. Key Performance Features Class-D (ADC Advanced D-Class) output stage with up to 87% efficiency IP55-rated aluminum chassis for protection against humidity and external agents Balanced fully-differential high-noise rejection inputs USS (Universal Speakers Simulators) speaker-load detection for OEM head unit compatibility ART (Automatic Remote Turn-On/Off) (enable/disable) for OEM integration Sealed power/inputs/speaker outputs to help prevent oxidation Single-side access to filter controls for easier in-vehicle calibration Power Output (RMS) 4CH @4Ω: 90W x 4 4CH @2Ω: 150W x 4 3CH: 80W x 2 @4Ω + 330W x 1 @4Ω 3CH: 145W x 2 @2Ω + 300W x 1 @4Ω 2CH bridged: 300W x 2 @4Ω Input / Output & Tuning Inputs: Pre IN / Speaker IN Input sensitivity: 0.2–6V RMS (Pre IN), 2.2–22V RMS (Speaker IN) Filter (OUT 1–2): Hi-pass 50–5k Hz @ 12 dB/oct, or Full Filter (OUT 3–4): Hi-pass 50–5k Hz @ 12 dB/oct; Lo-pass 50–500 Hz @ 12 dB/oct; or Full Bass Boost: 45 Hz, adjustable 0–8 dB (LP = ON only) Installation Use Cases Front + rear speaker amplification in compact builds 4-channel amp for OEM integration where turn-on and load detection matter 3-channel setup (front speakers + bridged sub channel) using published 3CH ratings Space-constrained installs needing sealed connectors and an IP-rated chassis Technical Specifications Brand: Hertz Series: SPL Show Model: SP 4.500 UPC: 8018823139922 Amplifier Class: Class D (ADC Advanced D-Class) Channels: 4 Frequency Response (-3 dB): 10 Hz – 35 kHz S/N Ratio (A-wtd @ 1V input): 100 dBA Distortion (THD @ 1 kHz, 4Ω, 70% rated power): 150 IP Rating: IP55 Max Size (mm/in): 192.7 x 130 x 49 mm (7.59 x 5.12 x 1.93 in) Weight: 1.9 kg (4.18 lb) What’s Included (1) Hertz SP 4.500 amplifier (1) Power supply harness (1) Speakers-out harness (4) Installation screws (3.5 x 25 mm) (4) Wire-to-RCA adapters Why Buy From MCOR Automotive Authorized retailer Expert amplifier matching and system design support Fast fulfillment with knowledgeable install-level guidance Physical Specs mm in A 185.7 7.31 B 192.7 7.58 C 107 4.21 D 130 5.12 E 49 1.93 Fitment, Installation & Warranty Notes Fitment Help: Need help confirming fitment, compatibility, amplifier matching, or installation parts? Use our Fit Guide or contact us through the chat button before ordering. Authorized Retailer: MCOR Automotive is an authorized Hertz retailer. Products purchased from MCOR include applicable manufacturer warranty coverage when installed and used according to manufacturer guidelines.
