Features
- Super wide edge poly-ether surround
- Triangular lattice helps eliminate wobbles and offset caused by non-linear movement
- Spider ring design increases linear position of spider
- Patented PSP (Parallel Series Parallel) terminal for easy speaker wiring and impedance selection
- Aluminum bobbin built voice coil
- Military-grade flat surface wire
- 30 day limited manufacturer’s warranty
Parameters
- Revc: 2.000 ohm
- Levc: 6.363 mH
- Fo: 23.581 Hz
- Sd: 89.000 msqM
- BL: 21.285 TM
- Qms: 4.846
- Qes: 0.380
- Qts: 0.352
- No: 0.295%
- SPLo: 86.7dB
- Vas: 3.117 CuFt
- Cms: 78.468 uM/N
- Mms: 580.5293g
- Mmd: 565.262 g
- Xmax: 4″ Peak to Peak
Specifications
- Size: 15″
- Max Power: 15,000 Watts
- RMS Power: 7,000 Watts
- Impedance: Dual (2 x 1-Ohm) voice coils
- Sensitivity: 87.4 dB
- Recommended Enclosure Type: Ported / Vented
- (4) Quad Nomex/Romex spiders
- 8 gauge speaker terminals
Dimensions
- Net Weight: 120 lbs
- Mounting depth: 14.5″ (396mm)
- Cutout diameter: 14.56″ (396mm)
Lava-fused Quad Helix Voice Coil
HoLeeS is equipped with a unique voice coil of incredible proportions. The voice coil has a winding height of over 4″ (10 cm), which results in identical electrical and mechanical x-max. The colossal winding height results in record electromagnetic coupling, which ensures against compression even under extreme use. The strong electromagnetic coupling increases the working impedance and enables the use of high-voltage amplifiers, as higher voltage potential can be exploited.
The voice coil former (the cylinder to which the coil is wound) is made of aluminum, not cellulose (cardboard), Kapton ®, or fiberglass. The use of aluminum prevents hot spots on the voice coil due to its superb heat conductivity. In essence, the entire voice coil becomes one big heat sink.
To further enhance voice coil strength, the super strong, ultra-high-temperature lava-based adhesive originally developed for the Subzero is used to bond the voice coil to the former (See the Subzero documentation for detailed info). Also borrowed from the Subzero is the unique anodization insulator for the coil wire.
Signature technologies such as the Quad-Helix winding scheme have evolved for use in the HoLeeS. The Quad-Helix design requires a very advanced production process. The Helix design is unique because it allows identical electromagnetic coupling and thermal signatures of two voice coils. A conventional subwoofer with dual voice coils is wound one on the other, resulting in asymmetrical electromagnetic coupling and heat dissipation capability. The Helix structure is free of these limitations since the two coils are wound synchronously in phase. The Helix wound voice coil has several obvious advantages – perfect electromagnetic coupling, identical thermal signature, lower distortion, higher performance, and durability.
The voice coil comprises four (Quad) edge wound oxygen-free copper wire layers. This special copper wire is of the flat-wire type. Flat wire has a much greater surface area than conventional round wire and can thus dissipate considerably more heat. Another advantage is the coil can be wound closer – increasing motor power. The coil assembly meets mil-std specifications for temperature resilience – specifications set by the U.S. Department of Defense for use in military equipment. This guarantees peak performance even during hard and continuous operation.
TCT – Turbine Cooled Transducer
HoLeeS is equipped with the patented TCT (Turbine Cooled Transducer) technology. TCT creates a cooling airflow similar to a tornado around the voice coil. Air forced through cooling channels milled in a vortex structure creates the tornado. Traditional voice coil cooling is done by drilling out the pole piece, and the woofer stroke then pushes air back and forth. This cooling scheme only has a linear increase as a function of the woofer stroke.
TCT is unique in that it increases cooling capacity exponentially as a function of woofer stroke. This is achieved by harnessing the centrifugal forces in the mini tornado to increase surface area contact between the air and voice coil. TCT is so effective that the voice coil temperature is reduced by 50% compared to the same woofer without TCT. This prevents heat-derived compression and keeps the woofer at maximum efficiency. The compression results from the increased electrical resistance of the voice coil – the higher the temperature, the higher the resistance. Since TCT’s cooling capacity increases exponentially with excursion, heat cannot build up. The harder you drive HoleeS, the more it cools.
Poly-Ether Draw SWE (Super Wide Edge) Suspension
For HoLeeS, our unique SWE (Super Wide Edge) suspension design has been enhanced by using Poly-Ether draw material. Sporting an extreme curve height of 62mm, the stage has been set for incredible excursion. The manufacturing of this advanced suspension is a complex process spanning several stages. Poly-Ether draw is used primarily in military applications because of its strength and flexibility. The sophisticated and costly processing requirements have limited its use outside the military. Thanks to the obsessive high-tech emphasis by Earthquake, the entire Poly-Ether draw manufacturing process can be done in-house. The Poly-Ether material is thermally pressed and laminated as part of the manufacturing process, giving it extreme strength and mobility. The suspension geometry is of the single-layer type and allows ultra-long excursion without mechanical breakup. This results in woofer stroke potential above 100mm without deformation or increased mechanical resistance. This ensures perfect reproduction of even the most bass-heavy soundtracks.
Parabolic Deep Dish Woofer Cone
The HoLeeS cone is made of a proprietary non-pressed fiber-reinforced cellulose pulp substance with extreme stiffness. It is then superimposed with a parabolic deep dish made of a strong space-age polymer that obtains additional rigidity by its geometric shape. The cone does not flex or deform regardless of input power and frequency.
Quad Super-Spider with Composite Center and Symmetric Stitched Tinsel Leads
The HoLeeS spider is of the super spider type, which means the spider has the same diameter as the cone, ensuring the spider is not limiting excursion. The HoLeeS is equipped with a quad super spider unit comprised of a Nomex /Romex hybrid material that has been epoxy-coated for increased strength. The individual super spider units are arranged as identical opposites – canceling nonlinearities inherent to typical single or dual spider designs. The result is a clean sound – free from mechanical artifacts. For optimal performance the edge suspension and spider must have the same excursion potential, this is not possible with a traditional spider of limited diameter. Traditionally, the spider is glued to the voice coil. This results in heat transfer from the voice coil to the spider. This heat transfer affects the spider’s compliance and can, over time, degrade the spider. The HoLeeS super spider is not glued to the voice coil but attached to a composite center ring that, in turn, is bonded to the voice coil. The unique composite material is neither heat-sensitive nor a thermal conductor. Thus, the endurance and longevity of the HoLeeS are not affected regardless of drive level.
The tinsel leads to the voice coil are sewn into the spider to prevent collision with the cone during extreme excursion. This also extends the life of the tinsel leads, as they now bend more gently over a longer distance. The symmetrical design of the tinsel leads prevents an asymmetrical pull on the cone. The result is longer woofer life and greater endurance.
Quad Stacked Cobalt-Ceramic High Gauss Magnet System
HoLeeS is built around a gigantic magnet system. It consists of four substantial Cobalt-Ceramic magnets, which have been hyper-magnetized in-house by Earthquakes military grade Magnetiser. The four magnets have a total thickness of 8 cm, the top plate alone is 7cm, and the pole piece is 2cm. With a total height of 17cm – the voice coil is given unhindered travel space far beyond its mechanical limits. This ensures that not even the strongest transient may cause the device to run out of electromagnetic coupling. At the same time, the high gap height contributes to voice coil cooling, as the immense mass of metal effectively absorbs heat.
Diamond Cut Chassis with XLT Geometry
The HoLeeS is based on Earthquake’s signature XLT chassis geometry. It is the optimal design for extreme excursion. The XLT chassis allows for extra length between the spider (center suspension) and the magnetic gap. It is designed to accommodate oversized spiders and voice coils. The oversized and rigid chassis is made of cast aluminum, then diamond cut. This results in an ultra-rigid and robust chassis featuring stunning good looks. The chassis is further characterized by all components of the assembly being bolted together with stainless steel machine screws. This design is extremely rugged compared to ordinary assemblies, where the chassis and magnet system are often glued or tabbed together. The technically superior design ensures exceptional durability, sound quality, and pride of ownership.
