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The ELS303 was released in June 2005. Combining the sonic strengths of the ELS 3 bookshelf speaker with an integrated 130mm woofer, this 2 1/2 way floor-standing speaker now covers a much wider range of frequencies than a bookshelf or stand mount speaker can.

The ELS 303 utilises the Swift Tweeter and Lightning 130 midrange driver from the ELS 3 with improvements to the cross-over and midrange linearity. Epos has also developed a new 130mm woofer, based upon the same chassis as the Lightning 130 midrange. It can be differentiated by the round dust cap and lack of cone damping material used on the outside. The woofer is coupled to the rest of the speaker in a 2 1/2 way fashion with a high linearity crossover which rolls off at 100Hz. This combines with the low frequency output of the midrange to give added power handling to the bass, while maintaining a very slim 150mm front baffle, which improves imaging at high frequencies.

The ELS SUB has a massive and powerful 10" loudspeaker driver fitted to the front of the cabinet, with enough magnet strength and voice coil size to handle very high power levels for long periods without distress. Its cone diaphragm is very stiff to keep distortion and colouration to a minimum. The rubber suspension surround is smaller than normal and quite stiff, which also helps to reduce distortion and low frequency over-hang. In short it has been designed to be more appropriate for a two-channel bass unit than a conventional sub-woofer.

To further boost the fidelity of the ELS SUB it has a very stiff cabinet with extensive internal bracing which is rarely found in conventional subwoofers. It has a completely separate section at the back of the cabinet to house the amplifier, which is more normally found in professional speakers and not found in conventional subwoofers at any price.