Hertz SPL Show SP 4.900 Class-D 4-Channel Amplifier, 250W x4 RMS @2Ω

Hertz SP 4.900 is a compact multi-channel amplifier from the SPL Show Series built around the renewed Hertz ADC (Advanced D-Class) output stage. It is designed to deliver high continuous power with very high efficiency in installations where space, heat management, and reliability are critical.

The SP 4.900 supports 4-channel, 3-channel, or 2-channel configurations, making it suitable for full-range systems, bridged subwoofer applications, or mixed front + sub layouts. With up to 160W x 4 RMS @ 4Ω or 500W x 2 RMS @ 4Ω bridged, it provides substantial output from an ultra-compact chassis, ideal for motorcycles, under-seat installs in sports cars, and behind-seat truck installations.

Key Performance Features

• Advanced D-Class (ADC) amplifier architecture with up to 85% efficiency
• Configurable 4-channel, 3-channel, or 2-channel operation
• High continuous output with low distortion and high damping factor
• Ultra-compact aluminum chassis for space-restricted installs
• IP55 rating for resistance to dust, moisture, and environmental exposure
• Designed for automotive, motorcycle, and powersports applications

Power Output

• 4 Channels @ 4Ω: 160W x 4 RMS
• 4 Channels @ 2Ω: 250W x 4 RMS
• 3 Channels @ 4Ω: 160W x 2 + 500W x 1 RMS
• 3 Channels @ 2Ω: 250W x 2 + 500W x 1 RMS
• 2 Channels @ 4Ω (Bridged): 500W x 2 RMS
• Total Power: 1000W

Inputs & Tuning

• Pre-amp (RCA) and high-level speaker inputs
• Independent filtering for Channels 1-2 and 3-4
• High-pass filter: 50–5,000 Hz @ 12 dB/oct
• Low-pass filter: 50–5,000 Hz @ 12 dB/oct
• Bass boost: 45 Hz, adjustable 0–8 dB (LPF enabled)
• Remote turn-on via traditional remote or DC-offset speaker signal

Installation Use Cases

• Front and rear speaker amplification in compact vehicles
• Front speakers + bridged subwoofer systems
• Motorcycle and powersports audio systems
• Under-seat or behind-seat truck installations

Technical Specifications

• Brand: Hertz
• Series: SPL Show
• Model: SP 4.900
• Amplifier Class: Advanced D-Class (ADC)
• Channels: 4 / 3 / 2
• RMS Power: 160W x 4 @ 4Ω
• Total Power: 1000W
• Minimum Load Impedance: 2Ω (4-ch), 2Ω + 2Ω + 4Ω (3-ch), 4Ω (2-ch)
• THD: 0.02% @ 1 kHz, 4Ω
• Signal-to-Noise Ratio: 105 dBA
• Frequency Response: 10 Hz – 35 kHz
• Damping Factor: 200 @ 1 kHz
• Operating Voltage: 11–15 VDC (6–16 VDC pulse)
• IP Rating: IP55
• Dimensions: 211.6 x 130 x 49 mm (8.33 x 5.12 x 1.93 in)
• Weight: 2.15 kg (4.74 lbs)

What’s Included

• (1) Hertz SP 4.900 amplifier
• Mounting hardware
• User documentation

Why Buy From MCOR Automotive

• Authorized Hertz retailer
• Pro-level system design and amplifier matching support
• Experience with automotive and motorcycle audio systems
• Fast shipping and knowledgeable technical assistance

Physical Specs

	mm	in
A	205	8.07
B	211.6	8.33
C	107	4.212
D	130	5.118
E	49	1.929

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.