Description
Included in this kit
This bundle includes a Hertz SP-4.500 D-Class 4 Channel Amplifier 125 W RMS x 4 at 2Ω, and 2x Hertz HMX 7.7 S-LD-SW – 7.7" Hi-End LED Marine Coaxial Speaker, 200W Peak, 4Ω, IP65 Water-Resistant, White Sport Grille, UV & Salt Fog Certified.
1x Hertz SP-4.500 D-Class 4 Channel Amplifier 125 W RMS x 4 at 2Ω (SP-4.500)
SP 4.500 features Hertz ADC (Advanced D-Class) output stage, reaching up to 85% efficiency and delivering an impressive power rating of 90 x 4 (4Ω) W RMS or 300 W x 2 (4Ω) W RMS when bridged, with an ultra-compact size of 192.7 (7.58) x 130 (5.1) mm (in.) x 49 (1.9). Being ultra-compact with impressive power, SP 4.500 is the ideal choice for Motorcycle applications and for under-seat in sports cars and behind-seat installations in trucks.
General Specs
Channels: 4 - 3 - 2
Nominal power supply voltage: 11 ÷ 15 VDC
Pulse Operating voltage: 6 ÷ 16 VDC
Idling current: 0.9 A
Idling current when off: 0.03 mA
Consumption @ 14.4 VDC, MIN load impedance (Max Musical Power): 27 A
Remote IN: 6 ÷ 15 VDC (9 mA)
DC-REM - Remote Turn on by SPK DC from OUTPUT BTL speakers: 3.5 ÷ 7 VDC
Distortion - THD @ 1 kHz, 4Ω, 70% Rated Power: <0.02%
Damping factor @ 1 kHz, 4Ω, 2 VRMS: >150
Bandwidth @ -3 dB: 10 Hz ÷ 35 kHz
S/N ratio (A weighted @ 1 V Input): 100 dBA
Pre-In sensitivity: 0.6 ÷ 6 VRMS
Speaker-In sensitivity: 2.2 ÷ 22 VRMS
Minimum load impedance:
@ 4Ch: 2Ω
@ 3Ch: 2Ω + 2Ω + 4Ω
@ 2Ch: 4Ω
IP Rating: IP55
Operating Temperature Range: 0°C (32°F) to 55°C (131°F)
Max size (mm/inch): 192.7 x 130 x 49 / 7.58 x 4.18 x 1.9
Weight (kg/lbs): 2.15 / 4.74
Adjustable Crossovers: yes
2x Hertz HMX 7.7 S-LD-SW – 7.7" Hi-End LED Marine Coaxial Speaker, 200W Peak, 4Ω, IP65 Water-Resistant, White Sport Grille, UV & Salt Fog Certified (HMX-7.7-S-LD-SW)
Hertz HMX 7.7 S-LD-SW – Premium 7.7" LED Marine Coaxial Speakers (Pair)
The Hertz HMX 7.7 S-LD-SW marine coaxial speakers deliver premium sound and unmatched durability for open-water listening. Featuring a sport-style, paintable grille with integrated LED lighting, these speakers provide high-quality audio with a modern, customizable look. Engineered with Hertz Pure Marine Certified construction, they are ready to perform season after season in the harshest marine environments.
Marine-Grade Construction
- IP65 Certified – Resistant to water and dust ingress.
- UV Resistance – ASTM-D4329 compliant for long-term exposure to sunlight.
- Salt Fog Resistance – ASTM-B117 compliant for corrosion protection in marine conditions.
- Gold-Plated Terminals – Corrosion-resistant for optimal signal transfer.
Audio Performance
- Component Type: Hi-End LED Coaxial
- Woofer: 7.7" (196 mm) polypropylene cone with UV inhibitors and co-molded Santoprene surround
- Tweeter: 1.4" (36 mm) neodymium magnet with PEI dome, faceplate, and acoustic lens for best off-axis dispersion
- Woofer Voice Coil: 1.26" (32 mm)
- Tweeter Voice Coil: 0.8" (20 mm)
- Woofer Magnet: High-density flux ferrite – 3.54" x 1.57" x 0.79" (90 x 40 x 20 mm)
- Tweeter Magnet: Neodymium – 0.78" x 0.12" (19.7 x 3 mm)
- Frequency Response: 45 Hz – 25 kHz
- Sensitivity: 91 dB SPL
- Xmech: ±0.33" (±8.5 mm)
- Xmax: 6 mm
- Re: 3.3 Ω
- Fs: 60 Hz
- Le: 0.56 mH
- Vas: 12.50 liters
- Mms: 22 g
- Cms: 0.32 mm/N
- BL: 6 T*m
- Qts: 0.72
- Qes: 0.76
- Qms: 11.8
Power Handling
- Continuous Power: 100 W RMS
- Peak Power: 200 W
- Nominal Impedance: 4 Ω
Design & Features
- Sport-style, sound-transparent grille for efficient high-frequency transfer
- Paintable grille for custom aesthetics
- Built-in LED lighting for visual enhancement
- Aramid fiber spider with silicone-insulated lead wires
- Sealed built-in crossover with resettable solid-state tweeter protection
- Optimized for infinite baffle applications
Physical Specifications
- Mounting Depth: 4.4" (113 mm)
- Overall Dimensions (W x H x D): 17.87" x 8.98" x 5.79" (454 x 228 x 147 mm)
- Weight (Each): 11.70 lbs (5.31 kg)
Sold as a Pair.