Used Martin Audio Blackline H3T+
Used Martin Audio Blackline H3T+ loudspeakers are high performance, all-horn three-way systems delivering wide-bandwidth coverage in a single cabinet, suited to larger clubs and large-scale installs. Second-hand examples offer a proven Martin Audio solution with a horn-loaded hybrid LF section and constant-directivity HF performance. Browse the used Blackline H3T+ listings available below to find the right unit for your application.
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Martin Audio Blackline H3T+ specifications
| Brand | Martin Audio |
| Segment | Audio |
About the Martin Audio Blackline H3T+
The Martin Audio Blackline H3T+ is a high performance all-horn three-way loudspeaker system in a single wide-bandwidth cabinet. Its Hybrid low frequency section combines a horn-loaded 15-inch driver with a reflex-loaded enclosure to extend output below the horn's natural cut-off point, while a water-resistant cone and triple roll surround allow increased excursion. The mid-horn uses a unique phase-ball loading device to maintain constant directivity at the upper end of the horn's range, driven by a 10-inch midrange driver with an aluminium demodulating ring for clarity and reduced distortion. The 70-degree by 40-degree HF section is powered by a neodymium 1-inch exit compression driver with a Kapton diaphragm for high sensitivity. The H3T+ supports bi-amp and tri-amp operation and is fitted with handles and castors for ease of deployment.
Martin Audio Blackline H3T+ — buyer FAQs
What is the Martin Audio Blackline H3T+ and what is it designed for?
The Martin Audio Blackline H3T+ is an all-horn, three-way loudspeaker system in a single wide-bandwidth cabinet. It is designed for larger club performances and large-scale installations. Its architecture combines a Hybrid low-frequency section, a phase-ball loaded mid-horn and a 70-degree by 40-degree HF section, making it suited to applications that demand consistent directivity and extended frequency coverage.
How does the Hybrid LF section of the H3T+ work?
The Hybrid low-frequency section uses a horn-loaded 15-inch driver with a 4-inch voice coil that is also reflex loaded, extending LF output below the horn's natural cut-off point. The cone is water resistant and the surround is a triple roll design to allow increased excursion. This combination is what Martin Audio calls the Hybrid approach, blending horn-loading and reflex-loading in a single enclosure.
What amplifier or controller does the H3T+ require for bi-amp or tri-amp use?
In bi-amp mode, a Martin Audio M3+ Electronic Controller is available to handle crossover and limiter functions for the H3T+. For tri-amp operation, a DX1.5 or equivalent controller is recommended to provide those same crossover and limiter facilities. Neither controller is built into the cabinet itself, so the appropriate external unit should be budgeted for when planning a system.
Who makes the Blackline H3T+ and where does it sit in the Martin Audio range?
The Blackline H3T+ is made by Martin Audio, a British loudspeaker manufacturer founded in 1971 and based in High Wycombe, England, now part of the Focusrite Group. Within the Blackline range it represents a high-performance, all-horn three-way format aimed at demanding professional applications such as larger clubs and large-scale installs, rather than smaller utility or portable use cases.
What should I check when buying a used second-hand H3T+?
Check that all three driver sections are functioning correctly, including the LF, mid and HF compression driver, as any one failed driver reduces the system to partial operation. Confirm whether handles, castors and any grilles are present, and ask whether an M3+ or compatible controller is included or available separately. Listings on this page vary by condition and included accessories. Every purchase on 10K Used carries a 21-day warranty covering major functional faults; full detail is in the buying guide at 10kused.com/used-av-equipment-guide/.
