Mobile Electronics› Power Accessories

Alphard Audio

Class D Monoblock Amplifier

$519.90

SKU: ATOM 5.5K PRO

In Stock
In Stock
Ships by Sep 12
Free Shipping over $200
$100 Minimum Order
30 Days Return
INSTALL DIFFICULTY
DIY PRO SHOP

Moderate — 2–4 hours

Overview

The Alphard Audio ATOM 5.5K PRO is a Class D monoblock amplifier designed to deliver significant power. It offers a frequency response of 10 - 250 Hz and can produce up to 5500W RMS at 1 Ohm with a 14.4V input. The amplifier also features a low-pass filter adjustable from 40 - 250 Hz and a subsonic filter from 10 - 50 Hz.
Show original supplier description
The Alphard Audio ATOM 5.5K PRO is a Class D monoblock amplifier engineered for high-output audio systems. This amplifier is capable of delivering a substantial 5500 Watts RMS at a 1 Ohm load with a 14.4V input, and 3900 Watts RMS at 1 Ohm with a 12V input. It also provides 2850W RMS at 2 Ohms and 1710W RMS at 4 Ohms, both at 14.4V. Designed for versatility, the ATOM 5.5K PRO operates within a frequency response range of 10 - 250 Hz. It includes integrated crossover and filter controls, featuring a low-pass filter (40 - 250 Hz) and a subsonic filter (10 - 50 Hz) with a 12 dB/Oct crossover slope. The bass frequency adjustment can be fine-tuned between 35 - 90 Hz, allowing for precise tonal shaping. Installation is facilitated by its robust input terminals, accepting 0 Ga power wire, and output terminals for 4 Ga speaker wire. The amplifier operates within a working voltage range of 9 - 16 V, and boasts a signal-to-noise ratio of ≥ 82 dB. Its compact dimensions of 11.4 x 8.6 x 2.6 inches make it suitable for various installation environments.

Product descriptions are provided by our supplier partners and may not always be perfectly accurate. Not sure this fits? or call (760) 282-4645 and we’ll verify before you order.

Fitment

Fitment Guaranteed

Don’t gamble
on fit.

Log your build in the MOTORMIA app and we’ll guarantee this part fits your exact setup — or your money back, return shipping covered.

Available on iOS & Android

Specifications

BrandAlphard Audio
Part NumberATOM 5.5K PRO
CategoryMobile Electronics

We’re here — turning wrenches, just like you.

Call us, follow along, or come say hi.

(760) 282-4645 Instagram Google

Buy with Confidence

Returns & Fitment

Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

View Full Return Policy

Shipping

Orders are processed in 1–3 business days. In stock parts ship promptly from our partner network. Special-order items either aren’t currently stocked or are built to your spec — expect 4–6 weeks. If a part goes on backorder while your order is in the queue, we’ll reach out and work through discounted alternatives together.

Free shipping over $200 in the continental US. Alaska, Hawaii, U.S. territories (Puerto Rico, U.S. Virgin Islands, Guam, American Samoa, and the Northern Mariana Islands), and international orders carry surcharges — most appear at checkout. Some exceptions (LTL freight, or suppliers who quote freight only after we place the order) won’t. In those cases we’ll reach out with the exact charge before your order moves forward.

View Full Shipping Policy