Infinity Reference REF-551A Mono Subwoofer Amplifier
(JBL Infinity REF551A)

We Think You Should Know

• 550W RMS at 2 ohms
• 370W RMS at 4 ohms
• 10Hz - 320Hz frequency response
• Variable bass boost and subsonic filter
• Phase control for system integration

Overview

The Infinity Reference REF-551A is a mono subwoofer amplifier engineered to deliver powerful, dedicated low-frequency amplification for car audio systems. With 550W RMS at 2 ohms and 370W RMS at 4 ohms, this Class A/B amplifier provides ample power for demanding subwoofer installations. The 10Hz-320Hz frequency response ensures deep, accurate bass reproduction, while variable bass boost, subsonic filter, and low-pass filter allow precise tuning. Phase control optimises subwoofer integration with existing speakers, making this compact amplifier ideal for enthusiasts seeking authoritative bass performance.

Delivery

This item is sold and shipped by an Everyday Market Partner. Delivery costs and estimated delivery timeframes are shown on the product page.

Returns

Returns or refunds for Everyday Market items can't be processed in-store. These items are sold and shipped by our Everyday Market Partners, so all returns must be arranged online via Feedback & Enquiry form.

Change of Mind Returns

You can request a change of mind return within 30 days of purchase if your item is in new condition. Items must be unused, undamaged, and returned in their original packaging, including all tags for clothing, footwear and accessories. Some items aren’t eligible for a change of mind return, including bulky items, personal or hygiene-sensitive products, perishables, custom or personalised items, e-gift cards, prepaid SIMs, and dangerous goods. If your change of mind return is approved, a return fee may apply and will be deducted from your final refund. For full details and exclusions, please see our Change of Mind Returns Policy.

Faulty or Damaged Returns

If your item is faulty or arrives damaged, please contact the Everyday Market Partner as soon as possible via Feedback & Enquiry form. Providing clear details and photos will help the Everyday Market Partner assess the issue and work with you to resolve it quickly. Your rights under the Australian Consumer Law still apply.