Harmonic Design P12st 400 W RMS active subwoofer, 12" driver, Class-D amp 3 x 500 W @ 4 ohm, hd MultiDSP and FIR
FEATURES
Active 12” stereo subwoofer that combines compactness and power. With an elegant and robust design, it is easy to transport and ideal for mobile setups. It uses a specially developed long-excursion speaker with a 3" voice coil, single rubber surround, and ferrite magnet assembly that ensures optimal heat dissipation via pole piece ventilation with minimal power compression. Less heat generation also means greater reliability and reduced thermal stress on the voice coil. The result is excellent dynamics and controlled, incisive bass reproduction at incredible sound pressure.
The electronics are integrated into the subwoofer body, with a well-organized connection panel on the back offering all necessary inputs and outputs. The over 1500 W amplification stage works in conjunction with FIR (Finite Impulse Response) DSP technology, allowing precise sound management and superior audio quality.
The hd P12 stereo is the optimized subwoofer for the hd M and ML series speakers. Their frequency response is extended downwards, and the headroom/dynamics in the low range are significantly increased very efficiently, relieving the column speakers.
The top of the hd P12st features an M20 threaded insert for a pole and two generous carrying handles for easy handling. The cabinet is made of multi-ply birch wood and covered with a shock-resistant and scratch-proof textured paint. The front of the speaker is protected by a metal grille covered with acoustic foam. Four anti-abrasion rubber feet on the bottom ensure secure placement.
This subwoofer is particularly suitable for live events, DJ sets, conferences, and other applications that require high-quality sound and a quick and easy setup.
Main features
- 1 x 12" long-excursion speaker 400 W / 800 W
- Frequency response from 40 Hz
- 3-way Class-D output stage (3 x 500 W)
- High-end DSP with FIR filter
- Ultra-compact dimensions
- Subwoofer extension to match hd M / ML series
- Installation version available without handles / M20 thread
- hd LevelZ software
SPECIFICATIONS
- Principle: bass-reflex system
- Transducers: 1 x 12″ long excursion woofer with a 3″ voice coil, vented at the pole piece
- Crossover: active up to max. 180 Hz
- Power handling: 400 WRMS / 800 W peak
- Frequency response: 40 – 180 Hz
- Sensitivity: 98 dB/W/m
- SPL max: 133 dB (half space)
- Power @ 4 ohm: 3 x 500 W
- Enclosure: 15 mm multiplex birch wood, textured paint black, acoustic foam, ergonomic transport handles, M20 thread insert
- DSP: hd MultiDSP 2 IN 3 OUT with FIR / IIR filter, multistage limiter architecture, hd LevelZ remote software, LED meter and USB
- Connections: 2 x XLR input, 1 x NL4 output TOP L (2-pole), 1 x NL4 output TOP R & SUB (4-pole), 1 x IEC mains input
- Dimensions: 400 x 430 x 420 mm
- Weight: 19 kg
- Options: transport protection cover, installation version, RAL color customization
Technical characteristics
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About Harmonic Design
Harmonic Design is a brand specializing in the design and production of high-performance professional sound reinforcement systems. The catalog includes full-range loudspeakers, subwoofers, stage monitors, and solutions for fixed installations and live applications, designed to ensure high intelligibility, sound pressure, and reliability even in the most demanding uses. Thanks to careful acoustic design and the use of quality components, Harmonic Design products are appreciated by audio service providers, installers, and entertainment professionals who seek high performance and precise sound reproduction. Discover the Harmonic Design range and find the sound reinforcement system best suited to your professional needs.
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Shipments
Shipments
We ship throughout Italy and the European Union via selected express courier partners. All orders travel in special reinforced packaging and are covered by 100% included insurance to fully protect the value and integrity of professional equipment during transport.
Returns and refunds
Returns and refunds
You can request a return within 14 days of receiving the order. As these are professional hardware and devices, items must be returned completely intact, unused, unactivated, and sealed in their original packaging, complete with all accessories and manuals.
Frequently Asked Questions
Can't find the answer you're looking for? Our team of specialists is at your disposal for configurations or technical questions.
What are your shipping and delivery times?
What are your shipping and delivery times?
Orders are processed within 24/48 business hours. Delivery is made by insured express courier to guarantee maximum protection and safety even for the most delicate and expensive equipment.
Are the products covered by an official warranty?
Are the products covered by an official warranty?
Yes, all products are 100% original and covered by the official 24-month manufacturer's warranty. In addition, our technical department offers free after-sales support to assist you with the initial setup of your system.
How does the right of withdrawal work?
How does the right of withdrawal work?
If the hardware does not meet your expectations, you can return it within 14 days of receipt. The product must be returned intact, unused, and sealed in its original packaging, complete with all accessories and manuals.
What does it mean if a product is "Available on order"?
What does it mean if a product is "Available on order"?
Some complex professional audio systems or lighting equipment are ordered directly from official distributors based on customer requests. You can proceed with the purchase as normal and our team will immediately inform you of the exact arrival times at our warehouses.

