HDR-ClubStack is a unique, idealistic, and enthusiastic SoundArt project from Dortmund, Germany, aiming to redefine the boundaries of conventional club and event sound reinforcement.
Featuring Precision Devices PD.24603BR Sub Bass Drivers. At its core lies the vision of an audiophile-extended sound performance, merging space, audience, and sound into an immersive unity – for an even more tactile, highly dynamic, and immersive dancefloor experience at clubs and festival dancefloors.
The developer has been engaged in HiFi as well as club and festival sound applications for 30 years.
The system arose from the long-standing desire to create an ultimate club sound system tailored to higher personal standards, integrating experiences from both the HiFi realm and event sound reinforcement.
Technical Implementation and Innovations
The project incorporates technical concepts highly appreciated in the HiFi community, adapted for this application, for example:
- Very large horns covering a frequency range from below 500 Hz to the highest treble, which, despite their visually robust appearance, deliver a highly resolving, brilliant, clear, and direct HiFi sound – by no means inferior in the highest frequencies to conventional separate tweeters or smaller horns.
They provide exceptional sound directivity, precision, and clarityon the dancefloor, rarely matched by conventional sub-top or sub-line-array systems. According to the developer, this is consistently confirmed by visitors.
The large horns are a modified version of very rare, long-established large horns.
- The GFRP thickness was increased to at least 1 cm (approx. 1.5 inches).
- The rear of the horns is smooth and glossy, unlike conventional originals.
- The horns feature a three-segment stepped geometry.
These modifications result in:
- a uniform dispersion across all frequencies,
- a more consistent directivity up to the highest treble, than is possible with horns of this size with a continuous horn profile without steps.
Additionally, a highly floor-focused and unusually large dual 15-inch low-mid solution was developed, providing precise focusing and directionality to the dancefloor.
The largest component was the realisation of 8 × 24-inch, PD.24603BR subwoofers in a very large bass-reflex enclosure, configurable with variable tuning options for different applications. This theoretically allows the frequency range of large organs from 16 Hz to the highest frequencies in enclosed spaces. For club or festival applications, the focus is usually on reproduction from 26–28 Hz at −3 dB.
The entire system produces a strong focus on the floor in its intended standard setup.
Even 2 meters to the side of the floor or 2 meters above the system width, normal conversation is easily possible, and bass is barely perceptible.
Behind the system – without cardioid or endfire subwoofer technology – there is unusually little bass above 40 Hz.
According to the developer, this is created by the large, gapless enclosure.
Main Focus and Sound Character
The system’s primary focus is on a precisely oriented dancefloor performance, delivering maximum sonic accuracy, virtually unlimited volume and dynamic reserves, as well as a full, neutral, and voluminous sound reproduction.
Even at peak levels, playback remains not fatiguing and pleasant, free from listener fatigue or tinnitus sensations.
The clear, brilliant, and highly resolving HiFi sound impresses with a direct, precise character, making music for approximately 99% of visitors in Germany perceptible in a felt extended and nearly new dimension.
This results in an exceptionally dense, physically tangible, highly precise, and at times explosively powerful, detailed soundscape, surpassing what comparable sound reinforcement solutions, typically used at similarly sized events, achieve.
Solutions like 4-point setups would, for example, completely contradict the intended concept in terms of maximum precision and attack.
The main focus is on sound reproduction from a single front, single-level plane, ensuring a concentrated, coherent, and immersive listening experience.
Component Selection and Sound Design
Great emphasis was placed on component quality.
Due to the over 25-year long-standing, almost legendary presence of the PD 24-inch subwoofer and its well-known audiophile image, the developer initially chose the PDN2450. This was later replaced with the successor PD.24603BR to achieve an even further extended sound performance and more headroom.
Key Features (Subjective Highlights)
- Enhanced tactile experience – for a more physically tangible, immersive feel
- More headroom – allows dynamic peaks without distortion
- Maximum attack and impulsiveness – highly reactive and energetic sound
- Neutral and balanced sound performance – consistent across all frequencies
- Versatile for all music styles – from classical instruments and live rock to soul, hip-hop, classic club music, house, EDM, techno, and extreme fast, hard techno
- Immersive dancefloor experience – precise, impactful, and emotionally engaging
— The HDR-Acoustics Team
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