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Authorized dealer · Car Audio Bargain
Loud daily systems with several large subwoofers, or a first step toward competition, usually land in this range. The 3,500W to 4,400W monoblock amplifiers listed here include the Sundown Audio SALT-4 and SIA-3500D v2 and the Crossfire C7-4K from the C7 Series, each a single-channel amp meant for heavy subwoofer loads.
An amp in this band can pull several hundred amps at full output, so the vehicle's electrical system becomes part of the audio system. Plan on a high-output alternator, additional batteries and heavy 1/0 AWG power wire, sometimes in more than one run, along with matching ground wire and fuses near each battery. Skipping this step leads to voltage sag, dimming lights and an amp that never delivers its rated output.
Plan the enclosure and coil wiring first. Four high-power 12s or 15s, or a pair of 18s, are typical, but the final impedance decides how much the amp can deliver. Check each amp's chart at the load you will actually run instead of relying on the model name.
High-power amps produce real heat. Mount them where air can move across the heatsink, avoid burying them under carpet or luggage, and consider an amp rack with space between units if you run more than one.
Set gains with an oscilloscope or a meter and test tones, and use the subsonic filter to keep ported subs from unloading below box tuning. Clean power at this level is loud enough; clipped power at this level is how voice coils fail.
The Sundown SALT-4 and SIA-3500D v2 come from two different Sundown lines, while the Crossfire C7-4K is rated at 4,000 watts RMS. Compare features, footprint and the recommended wire and fuse size for each before choosing.
A step down sits in the 2,500W to 3,400W monoblock amplifiers, and serious competition builds move up to the 4,500W+ band. The full lineup is in amplifiers. Choosing from 3,500W to 4,400W makes sense once the charging system is ready for it.
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