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The Hifonics ZD-750.4D is a four-channel full-range Class-D car amplifier rated at 100W per channel into 4 ohms, 175W into 2 ohms, and 375W per bridged pair. It runs 2-ohm stable, uses a PWM MOSFET power supply, and has onboard high-pass and low-pass crossovers adjustable from 50Hz to 250Hz plus a bass control. That makes it a flexible single box for front and rear speakers or a bridged subwoofer setup. Class-D keeps it compact and cool-running, but it is a budget-line amp, so expect modest clean headroom and basic crossover control rather than the processing and build of premium four-channels.
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Lowest price we've seen: $125.99 on Nov 12 at Hifonics. Tracked across 13 stores since Nov 12.
The Hifonics ZD-750.4D Zeus Delta is a 4-channel, full-range Class-D car amplifier with up to 750 watts of maximum power output. It can run front and rear speakers, component systems, or bridged channels for more bass.
It uses a PWM MOSFET power supply and a low-noise preamplifier circuit. The aluminum heat sink helps manage heat. Protection circuitry with LED indicators covers overload and speaker protection.
An onboard electronic crossover has variable high-pass and low-pass filters from 50Hz to 250Hz, plus built-in bass control. The amplifier is 2 ohm stable and has a signal-sensing turn-on feature to simplify installation.
