REL T/9x SE Subwoofer — Review

Overview

The T/9x SE sits at the top of REL’s Serie T/x lineup — a limited-edition, visually striking version of one of the company’s most popular mid-series subwoofers. Audiograde’s Lee Dunkley, reviewing the Italian Racing Red finish, captured the appeal well: it’s more than just a flashy paint job, building on the standard T/9x with genuine acoustic upgrades alongside the eye-catching color options (Italian Racing Red, Le Mon Yellow, Tangerine Dream, French Racing Blue, and Green With Envy). Hi-Fi+ was similarly impressed with the concept, noting enough difference between the SE and standard T-Series subs to make it “an exciting development for the company.”

Build & Design

Cabinet construction is exquisite, following REL’s meticulous high-gloss finish process — multiple paint layers applied both horizontally and vertically. The SE’s badge alone takes three days to perfect, and each solid billet aluminum foot undergoes a three-day chroming process, layering copper, nickel, and chrome with a full day allowed between each coat to properly set — genuinely obsessive attention to detail for a subwoofer. The design draws inspiration from classic racing liveries, and REL clearly leaned into that aesthetic rather than playing it safe with the usual black or white gloss finishes most subwoofers ship in.

Driver & Amplifier

The core upgrade over the standard T/9x is the driver: REL’s chief designer John Hunter specifically reworked the front-firing 10-inch driver’s center cap, swapping the standard alloy dust cap for a carbon fibre version. That change reduces weight by 10 grams while increasing stiffness, resulting in a claimed 1.2dB output increase along with faster, more articulate bass response. A matching 10-inch down-firing passive radiator (also using long-throw design) supplements low-end output. Power comes from a 300-watt Class A/B monoblock amplifier — a design REL has used across Serie T flagships since 2007, with nearly 90,000 units in circulation and a strong track record for reliability. Setup uses straightforward analog rotary controls for gain, crossover, and LFE gain, plus a 0-180-degree phase switch — no app, no digital menu diving, just dependable, old-school engineering that Audiograde specifically praised for its simplicity.

Performance

Rated for -6dB extension at 27Hz, the T/9x SE punches well above expectations in real-world listening. Audiograde’s review, conducted in a genuinely difficult listening room (a converted 16th-century cottage with irregular dimensions), found the SE’s lighter carbon fibre driver kept sub-bass timing fast and accurate, integrating seamlessly with the main speakers with no sense of sluggishness or overhang. On tracks like Massive Attack’s “Teardrop,” the reviewer noted clear, deep bass notes without over-driving the room, plus noticeably richer, more natural-sounding drums. Acoustic material fared just as well — double bass on Jennifer Warnes’ and Rickie Lee Jones’ recordings came through with real scale and richness, and Prokofiev’s “Troika Song” delivered more low-end weight and power than the reviewer remembered from the same recording without the sub. Audiograde’s verdict was a “Recommended” award, specifically praising how the SE’s fast, accurate timing made it disappear seamlessly into the overall sound rather than calling attention to itself as a separate component.

Owner reviews on REL’s own site echo this closely: buyers consistently describe the bass as fast, effortless, and well-integrated rather than boomy or one-note, with several specifically praising how the T/9x SE opened up the soundstage of their main speakers rather than just adding low-end thump. One owner running a stereo pair alongside Fyne F501SP speakers described the effect as making “everything better, bigger, more solid and clear.”

Features

Connectivity includes high-level Neutrik Speakon input, low-level RCA, and a dedicated LFE RCA input, with the SE compatible with REL’s optional Arrow Wireless system for a cable-free setup using REL’s zero-compression wireless protocol. REL specifically notes the T/9x SE works best in rooms between 150-400 square feet, and can be run in stereo pairs (including mixed colors, which REL says has become something of an owner trend) or integrated into REL 3D home theater setups alongside Serie HT or Serie S models. It is not designed for vertical line-array stacking — REL points buyers wanting that configuration toward its HT/1510 Predator or Serie S models instead.

Value

At $1,799 (single) or $3,598 (stereo pair) — a modest premium over the standard T/9x’s $1,699 — the SE represents a genuinely small price increase for a meaningful performance step-up plus a striking visual upgrade. Audiograde’s only real caveats were that existing T/9x owners may not find the SE a big enough leap to justify upgrading, and that Arrow Wireless connectivity costs extra rather than coming bundled. Customer reviews on REL’s own site sit at a perfect 5.0 out of 5 across multiple verified purchasers.

Verdict

Pros: Fast, accurate, well-integrated bass thanks to the lighter carbon fibre driver center cap; genuinely striking, meticulously finished color options; dependable, straightforward analog setup controls; strong reliability pedigree from a proven amplifier platform; excellent value for the performance step-up over the standard T/9x; Arrow Wireless compatibility for cable-free setups.

Bottom line: The T/9x SE takes an already well-regarded REL subwoofer and makes it both faster-sounding and better-looking, for a genuinely modest price premium. For anyone shopping a mid-sized room and wanting fast, musical, well-integrated bass with genuine visual flair, it’s an easy recommendation.