SEAS Prestige Line - Loudspeakers - Hasaudio |
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The Seas
Prestige line represents
some of the best
low to mid priced speakers in
the world. Seas Prestige
Loudspeakers -audiophile
results at rock bottom
prices.
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Dome tweeters
We have dome tweeters with 19 and 25 mm voice coil diameters and different surround diameters. The rigid chassis are made from glass filled engineering plastic materials by injection moulding. The cosmetic standard of our chassis is very high. Further, the chassis may be custom designed to specified shapes, surface finishes, fixing holes, logos etc. within wide limits. The corresponding tool expense is quite reasonable. We offer dome diaphragms made from soft materials such as impregnated fabric, aluminium and from titanium. The latter is equipped with a soft surround which suspends the dome diaphragm in a compliant, but precise and dependable manner. All dome diaphragms and surrounds are made in-house at SEAS, except for anodized aluminium and titanium. The relatively fragile aluminium diaphragms may be protected by wire mesh or perforated metal grilles, or by plastic diffusers. The diffusers also linearize the frequency response to an amazing degree.
The 25 mm voice coil dome tweeters with ferrite magnets may be equipped with a damped hole in the magnet pole and with a rear chamber, thereby offering a low resonance frequency. The voice coil may be fitted with braided lead out wires for applications which involve larger coil excursions.
The highly efficient magnet material made from Neodymium, lron and Boron has been used both in small 1" dome tweeters for general use and in specialized tweeters for our coaxial drivers.
The latest addition to our range of tweeter is the Seas Prestige DXT® tweeter , with controlled wide dispersion.
All SEAS tweeters are available with magnetic fluid in two different viscosities which improves the heat transfer from the voice coil. It also introduces mechanical damping of the voice coil. The consequent smoothing of the impedance curve simplifies crossover design considerably.
Cone units
Our cone drivers are generally based on injection moulded zinc chassis, powder coated for attractive and durable protection. The moulding process allows us to locate the material exactly where it is needed for stiffness and strength, which is essential to high quality sound reproduction.
We offer a wide range of cone materials:
Aluminium (which is very stiff, yet reasonably light). Paper (a wide range of different pulps are available along with a highly efficient coating material for dynamic control). We also have Polypropylene (unfilled, or mineral filled for increased stiffness). XP (an optically transparent high polymer material which is light, stiff and well damped). Glass fibre weave (which is impregnated for stability and dynamic control).
Surround materials range from several different low loss natural rubber qualities for specialized woofers, to different high loss rubber intended for high accuracy in midrange reproduction.
Our impregnated fabric suspensions are generally flat and with slightly progressive stiffness characteristic for excellent linearity and stability.
Our voice coils are generally made from copper wire with duroplastic coating, allowing coil temperatures of 220-250 degrees centigrade before disintegration. We also have voice coils made with copper clad aluminium wires (CCAW) available. Although most drivers are equipped with two layer coils, some woofers have four layer coils for higher inductance and reduced high frequency output.
Most coils are wound on aluminium formers for high strength and heat dissipation. We also supply non-conducting formers without compromising on thermal or mechanical strength. These are made from Kapton, Nomex or Glassfiber.
The magnet systems are based on high quality barium ferrite magnets, and soft steel parts which are precision turned or fine blanked to ensure the highest dimensional tolerances in the critical gap area. The parts are bonded together by a heavy duty two component adhesive.
In order to reduce the magnetic stray fields for audio/video applications, we offer compensated magnet systems. A shielding cup enclosing the compensated magnet system, may be added for the most critical applications. We also offer shielding kits to our standard drivers presented in this catalogue.
The dust cap has great influence on the behaviour of a drive unit at high frequencies. We offer dust caps made from various paper qualities and from fabric. All of these may be coated for dynamic control. Dust caps made from Polypropylene, Aluminium and various PVC qualities are also available. Instead of the dust caps, we also offer phase plugs which eliminate the cavity inside the coil former, thereby lowering sound colouration. Since the phase plug improves the air circulation around the coil windings, the coil temperature variation as well as the consequent sensitivity modulation are lowered. Further, the power handling capacity is increased.
The lead out wires are made from high quality materials for durability and dynamic control. We also take great care in arranging the wires so that they move in a smooth, controlled way.
In order to assemble the above parts correctly, consistently, and in a durable way, we use high quality specialized adhesives and application equipment. Precision jigs and fixtures keep the parts firmly in position while the adhesives set. This is important, because in many positions, especially between cone and surround, the type, amount and distribution of the adhesive have great influence on the performance of the driver.
We hope that the above gives an impression of how much we care about the quality of our products for the benefit of you as our customer.
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