Experience music, be right in the middle of it, soak up the atmosphere, “see”, feel and sense each instrument, each voice - this is how speakers should reproduce music.

In order to reproduce music authentically, vividly and naturally, the ELAC R&D engineers have paid special attention to three-dimensional sound radiation patterns. Their aim: to acoustically “energize” the room in a consistent and harmonised way.

To this end, ELAC has developed new transducer systems for the bass and midrange, and has calibrated the crossover network to optimise sound dispersion characteristics across the entire frequency range. The result is a uniquely precise and musical three dimensional soundstage.

The ELAC JET tweeter is one of the most legendary tweeters in the hi-fi trade and has won international renown with its unusual transparent and effortless sound image.

The JET tweeter was developed to perfection on the basis of the famous 'Air Motion Transformer' by loudspeaker pioneer Dr Oskar Heil. Its principle: a concertinaed foil membrane is driven by a strong magnet system of neodymium rods.

This 'motor' drives the air considerably faster than the conventional pistonic technique. High sensitivity and extraordiary dynamics are the result.

The picture at the left displays the new JET III tweeter with its larger sound orifice. Due to many additional design changes (e.g. new neodymium magnet system) a higher efficiency and a smoother sound pressure level frequency response up to 50 kHz was achieved.

A special feature are the ELAC proprietary bass ports. As if from the wind tunnel, the double flare port has been designed so as to minimise ventilation noises and to reduce friction losses.

The sound of loudspeakers is heavily influenced by room-acoustics. In some cases the room shape and especially the furnishings offer less than ideal conditions for the optimum set-up of the loudspeakers, sometimes resulting in bass reproduction which is too strong.
When loudspeakers are used close to walls or in small rooms and the bass is too prominent the ELAC Bass Control plug can be used to improve the bass reproduction by reducing the low frequency output.
Just insert one or both of the supplied ELAC Bass Control plugs into the bass ports on your loudspeakers until the bass is at the correct level relative to the midrange and treble.

ELAC vented loudspeakers use bass reflex tubes with different lengths and diameters (45, 59, 60, 62 or 70 mm).

Here is a list of Bass Control plugs and their matching bass reflex tubes:

• use 55 mm diameter cylindrical rubber foam plugs with 45 mm bass reflex tubes,
• use 70 mm diameter cylindrical rubber foam plugs with 59 / 60 / 62 mm bass reflex tubes,
• use 60 mm nominal diameter polyurethane foam plugs with 60 mm bass reflex tubes.
• use 70 mm nominal diameter polyurethane foam plugs with 70 mm bass reflex tubes.

The ELAC "JET Dispersion Control DC" is a flat ring made of open-cell rubber foam which is mounted around the JET orifice with four clasps (or with adhesive tape).

The JET DC results in a broadband reduction of about 0.5 dB of the radiated sound level nearly independent of frequency. The JET DC is best suited for rooms with little sound absorption at high frequencies, especially for rooms with large windows without curtains or with a smooth floor without a carpet.

All loudspeakers of the 240 series are supplied with the JET Dispersion Control as an accessory.