CONES

A cone’s material strongly influences the acoustical behaviour and the sound of a loudspeaker. Hence for every specific application the optimum material should be used. DKM gives you support in choosing the right material.

To fulfil every requirement, DKM produces cones from various materials:

  • Paper with different degrees of hardness, fillers, coatings and colours. Using hard basic materials with strong grouting also suitable for the top frequency range of a loudspeaker (tweeter cones).
  • Paper as a sandwich with a foam or honeycomb core
  • Plastic membranes based on PP, PC, PET, PEN, PEEK and much more, as a single layer or in combination with other materials.
  • High-modulus carbon fiber sandwiches as a single layer for the mid and high frequency range, as well as a stiff sandwich for the low frequency range.
  • Metal membranes (aluminum alloys) anodized in various colours or as an alternative with ceramic surfaces.
  • Metallmembranen (Aluminium-Legierungen) in verschiedenen Farben anodisiert oder auch mit keramischen Oberflächen.

We would also be pleased to supply you with our membranes also assembled with our surrounds.

PAPER CONES

Membran_Papier

Due to it’s ideal combination of low weight and excellent mechanical features (stiffness, damping) paper is still a material that is highly suitable for the production of loudspeaker cones. By means of special processes and materials DKM offers an appropriate solution for each of your applications.

1. Production of paper cones

  • sieve inside or sieve outside
  • pressed for improvement of fidelity
  • air dryed to increase internal damping
  • sizes up to 10 inches are produced in Germany, sizes larger than 10 inches are produced in UK

2. Materials of paper cones

  • production in UK: hardest Blue Sig, standard material and soft material Mu and K2 or very hard special material SigX
  • production in Germany: hard, black ST material, standard material and soft, damping materials V, DU, DS and special materials MA (Micra), NU
  • for increase of strength spacing material is used (aramid fibre, carbon fibre, glass fibre, ...)

3. After treatment of paper cones

  • hardening of cone neck or whole cone by painting
  • water-repellent, bactericidal or fungicidal design
  • complete immersion to raise internal damping
  • coating to improve appearance and acoustics
  • laminating with high-tech fabrics

SANDWICH CONES

SANDWICHMEMBRANEN

DKM’s sandwich cones are an optimum compound of strongly damping core material with a hard and stiff top coat. In this way mechanical strengths up to 10.000 Mpa are realised with a low weight.

DKM produces sandwich cones in different compounds:

  • honeycomb, foam, strongly damping paper as core material
  • glass fibre, aramid fibre, carbon fibre, bimax fabric etc. as top coat material
  • in various weights, surface structures and colours

METAL CONES

Metal cones fulfil the highest optical requirements combined with very high mechanical strength.

DKM produces cones of aluminium or aluminium alloys. For increase of stiffness or mechanical and chemical resistance aluminium material can be anodized.

PLASTIC CONES

KUNSTSTOFFMEMBRAN

Plastic cones provide a strong internal damping and allow a very balanced frequency response.

Moreover plastic is a very tough material that is well suited to outdoor applications, for example. Plastics used by DKM are resistant against corrosion and water and show a high UV stability.

By means of suitable spacing materials (e.g. talcum) the plastic stiffness can be increased further.

Plastic cones produced by DKM are deep-drawn on the basis of PA, PC, PES, PP, PS or innovative materials like PEN and PEEK. Typical materials used for injection moulding are filled or coloured polypropylenes.

FABRIC CONES

Gewebemembranen

Fabric cones are commonly used in, for example, midrange speakers (5 inches).

DKM produces high-tech fabrics with various grammages from 50 up to 300 g/sq.m.In order to sustain sound pressure, fabrics get an airtight coating.

Common fabric materials used by DKM are glass fibre, carbon fibre and Bimax fabric.

The optical appearance of fabric cones can be varied by colouration. For instance DKM produces black aramid fibre fabrics.

CERAMIC CONES

Ceramic cones are suited excellently for use at high temperatures. In special cases ceramic cones of DKM are applied at temperatures up to 250°C.

Owing to the specific characteristics of ceramics, these cones possess high stiffness as well as excellent mechanical and chemical resistance.