The K Array RedLine is an active subwoofer built around a 12-inch driver with 1200 W of integrated amplification, covering 40–150 Hz with a maximum SPL of 132 dB at 4 Ω. For distributors and rental companies sourcing used inventory, it is a compact, self-powered low-end box that pairs naturally with small line array and full-range systems where truck space and setup time matter. Because amplification is onboard, the unit is a single-point purchase: no separate amp racks, no matching calculations beyond AC power and signal.
Connectivity on the RedLine is straightforward for rental fleets: Speakon and XLR connectors, balanced XLR inputs with parallel TRS, and front-panel controls for Gain, Limit, Lift and Pad. The Lift control is useful for ground-stacked deployment where boundary coupling boosts low end; Pad helps match console output levels across mixed-brand racks. Confirm during inspection that all four controls move freely without scratchiness and that the Limit indicator behaves correctly under load rather than staying lit at idle. Buyers who also handle powered cabinets can apply the same inspection logic set out in our used amplifier buying guide when grading their own lots.
Condition grade A means the unit should present as fully functional with only light cosmetic wear. On a used K Array RedLine, check the following before committing: power the unit on 230V and listen for the soft-start and idle noise floor; run a sweep or program material through 40–150 Hz and listen for port chuffing, rattle or driver rub; inspect the 12-inch cone and surround for cracks, repairs or recone evidence; test both XLR and TRS inputs and the parallel output; verify the Speakon and XLR connectors are tight with no bent pins; and confirm the amplifier module, heatsink and rear panel show no impact damage or evidence of moisture. Ask for photos of the driver, rear panel and serial label. Rental companies building a mixed fleet can compare this box against other options in our second hand active subwoofer 12 inch range before deciding which model best fits their existing systems. Buyers weighing a compact 12-inch box against a larger horn-loaded design can read our used Funktion One 21SW152-8 buying guide for a parallel set of inspection points before committing to either format. Distributors comparing low-end options should weigh this compact box against a used Funktion One 21SW152-8 for sale listing before deciding which format suits their fleet.
For overseas buyers, the practical questions are power and spares. The RedLine is a 230V unit made in Italy, so confirm your destination market voltage and plug standard before shipping, and budget for step-down or step-up only if your venue power differs. Ask the seller whether the amplifier module has been serviced and whether any original accessories are included; if the answer is unclear, treat it as unknown rather than assume. Request a short video of the unit playing at moderate level, plus close-ups of the cabinet corners and grille, since grade A claims vary between sellers. Its compact, self-powered format also suits fixed installs, so buyers outfitting a venue should review our nightclub and bar PA system page for how a RedLine sub fits alongside full-range boxes. Where a rental fleet needs more low-end output than a single 12-inch box can deliver, it is worth comparing this unit against the used JBL SRX828S dual 18 subwoofer also listed in our stock. Rental companies sourcing a mixed fleet can browse our second hand pro audio gear department to see which other self-powered boxes fit alongside a RedLine sub.
Pricing, warranty and lead times are not fixed here and should be confirmed per lot and per destination. When comparing offers, weigh the cost of a replacement amplifier module and driver against the unit price, and factor freight class and packing for a self-powered sub. For rental fleets, a tested Grade A K Array RedLine with clean cosmetics and verified 230V operation is a low-risk addition to small-format systems; for distributors, it is a resale item that moves best when the test evidence and photos are complete. For larger events where several subs are ground-stacked or arrayed, check the concert and festival PA system page to see how these units integrate with line array and full-range systems. Distributors who also handle powered full-range cabinets can apply the same checklist approach outlined in our used JBL EON1500 buying guide when grading their own inventory. Distributors who also stock amplification can compare this self-powered box against a used Barefoot Sound amplifier unit listed in our current inventory.
Questions about this unit or about shipping to your country? Contact us for condition photos, test results and a quote. Buyers assembling a complete rental package may also want a used Crown CM-310A microphone on hand for test and measurement work.
Questions about this unit or about shipping to your country? Contact us for condition photos, test results and a quote.
Italian-made K Array RedLine series powered subwoofer, equipped with built-in amplifier and DSP processing module. The enclosure features a rugged black coated design with a metal grille bearing the K logo on the front, suitable for both touring performances and fixed installations.
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