The Epos ELS303 was released in June 2005. Combining the sonic strengths of the ELS 3 bookshelf speaker with an integrated 130mm woofer, this 2 ½ 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 ½ 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 cabinet has the same footprint as the ELS3 but the height is 87.5cms, including the plinth but not spikes. This brings the tweeter up to the optimum 81cms listening height to the user, when seated. The midrange section is not ported. The woofer section is braced and sealed off from the midrange section and is tuned with a port to 47Hz, which determines the lower cut-off frequency of 43Hz for the speaker.

Because the ELS 303 is a tall and slim speaker, it needs to be stabilised to prevent it being accidentally knocked over. Epos has designed a PVC foiled MDF plinth, which is attached to the bottom of the cabinet with 6mm bolts. The plinth increases the footprint of the speaker to make it more stable. 6mm spikes are also supplied to help decouple unwanted energy from the cabinet/plinth, when in use, through to the floor.

To enable the user to connect the bass driver separately from the midrange and tweeter, a gold plated bi-wiring terminal is used. Metal links join the upper and lower sections together and can be removed by the user to allow bi-wiring.

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The Epos ELS 3C centre channel utilises the same drive units as the ELS 3 and is therefore ideally matched for use in a home cinema application.

Featuring a 25mm metal dome tweeter with neodymium magnet, together with two 5 ½" woofers, this centre channel uses a new die cast aluminium chassis with a cone and surround similar to that being used in the M5 woofer. The Epos logo is embossed on the tweeter faceplate.

In designing this centre channel, we have introduced an unusual and acoustically advanced crossover which reduces the colouration when two mid/bass units are in close proximity to each other.

Available in a choice of three finishes, the Epos ELS 3C centre channel is ideal for use with other ELS products in a home cinema application.

The EPOS 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.

To further improve the sound quality Epos does not use port tuning to achieve increased bass extension, which avoids 'chuffing' air turbulence noises interfering with the fidelity of the loudspeaker.

As a general rule, stereo systems tend to be difficult to integrate with conventional sub woofers because, for the most part, sub woofers are generally not designed to match them, and therefore suit 5.1 systems only. The Epos ELS SUB is different and was conceived as a means of extending the frequency response of a small pair of bookshelf speakers, rather than just producing large outputs at one particular frequency, such as 60 Hz.

This may appear to contradict established principles, but Epos engineers have not limited themselves to only trying to produce a product that plays 'one note' sound. For that reason the ELS SUB is capable of extending low frequencies with a relatively flat response down to 20 Hz. This is most unusual and would normally be unheard of in conventional woofers, because apart from anything else their cabinets and amplifiers would rattle and buzz, due to the simple method of construction used.

As a consequence of the design principles, this ELS SUB is dynamic when part of a 5.1 system.

Back panel controls include High Level Input, Volume, Low Filter, Power Switch (when left on with no signal the sub's standby feature activates, AC Voltage Selector Switch, High Filter, Phase, Low Level Input, and High Level Input.

Additional features to be found in this sub are both over current cut-out and over temperature cut-out. The ELS SUB does not use a compression limiter to pre-distort the signals it cannot handle. No amplifier has infinite power capabilities and has to be protected against destroying itself under extreme conditions. To protect the sub's 300W amplifier from excessive current demands it has been designed to cut the signal to the speaker in the event of an overload. The sound output is restored automatically immediately the demand is lower. To protect the amplifier from damage caused by excessive heat, there is a thermal sensor attached to the amplifier's heatsink that is set to trip the output if the internal temperature exceeds a pre-set level. The reasons this might occur are high ambient room temperature, direct sunlight, high level operation for long periods and insufficient ventilation of the amplifier control panel.

With a finish similar to the ELS 3 speakers and ELS 3 centre channel, the new ELS SUB will be available in the same three finishes – light cherry, dark cherry and black ash. The sub woofer has a black fabric grille and is sold complete with spikes.

The M5i two-way bass reflex speaker may be the baby of the new series, but its performance belies its size. It is equally at home in a two-channel or home theatre application. As you would expect, it is fully shielded magnetically.

The M5i includes our revised Epos 25mm (1 in.) low distortion metal dome tweeter, designed to have smooth, clear extended treble. This tweeter features a strong die-cast aluminium alloy face plate, moulded surround, ferrite magnet and Ferrofluid cooling.

The new Epos 140mm (5.5in.) mid-range woofer reproduces dynamic, natural bass and mid-range frequencies. This robust drive unit has a die-cast aluminium alloy chassis and phase plug, with contoured moulded polypropylene cone. To reproduce bass cleanly and powerfully, it is loaded with a port flared at both ends, which reduces turbulence and distortion. The crossover is centred on 3kHz and incorporates film capacitors in critical locations.

The bi-wirable input panel is made from solid anodised aluminium alloy, with sturdy high-spec terminals suited for spade lug or other types of plugs. High-grade metal links join the terminals together and can be removed for separate connection to each driver.

The front and rear baffles of the cabinet are 25mm (1 in.) thick to reduce unwanted vibration and coloration. In a choice of three pattern matched real wood veneers, the M5i will be equally at home in a traditional or contemporary setting. With its stylish silk cloth grille it integrates easily with home furnishings.

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Epos approached the design of its M8i centre channel speaker exactly as you would expect - with no compromise to sound quality. Engineered specifically for the critical requirements of centre-channel reproduction, it has powerful bass, a fast, dynamic sound and high power handling. It is, of course, magnetically shielded.

The M8i includes the revised Epos 25mm (1 in.) low-distortion metal dome tweeter, designed to have smooth, clear extended treble. This tweeter features a strong die-cast aluminium alloy face plate, moulded surround, ferrite magnet and Ferrofluid cooling.

The new Epos 140 mm (5.5in.) high power mid-range woofer reproduces dynamic, natural bass and mid-range frequencies. Two such units are used in this model, isolated from each other in separate rear-ported enclosures and positioned either side of the tweeter. With two woofers working together at low frequencies, power handling and sound levels are greatly increased.

The M8i features an unusual crossover which reduces colouration from the two closely spaced mid-bass units. The upper crossover frequency is centred on 3kHz and incorporates film capacitors in critical locations. The bi-wirable input panel is made from solid anodised aluminium alloy, with sturdy high-spec terminals suited for spade lug or other types of plugs. High-grade metal links join the terminals together and can be removed for separate connection to each driver.

Centre channels can pose difficulties with placement but Epos has provided the perfect solution with the M8i. The cabinet is now rounded on the bottom and flat on the top. It is also supplied with a contoured plinth, so that the angle of the speaker can be adjusted to point at the listener.

The M8i is styled to complement any décor. With its silk cloth grille and beautifully manufactured real wood cabinets, it will easily integrate with all furnishings.

Traditionally the core of any Epos speaker series, the M12i is the ideal loudspeaker for those enthusiasts who prefer a stand-mount over a floor-stand option.

As with all speakers in the Mi range, the 12i is designed to meet all the demands of today's two-channel and home-theatre audio. It is equally at home with music or movies and is fully magnetically shielded. If the M12i is to be used in a home theatre application, the M8i centre channel and M5i, used for rears, make ideal choices.

The M12i uses the revised Epos 25mm (1 in.) low distortion metal dome tweeter, designed to have smooth, clear and extended treble. Featuring a strong die-cast aluminium alloy face plate, moulded surround, ferrite magnet and Ferrofluid cooling, it is a significant improvement over the earlier M tweeter. The upper frequency crossover is centred on 5kHz and the minimalistic 1st order crossover is simply a polypropylene film capacitor.

Epos has designed a robust new 165mm (6.5in.) mid-range woofer with die-cast aluminium alloy chassis, phase plug and moulded polypropylene cone. Its curved cone profile and graduated thickness were engineered to 'roll off' high frequencies mechanically, in a smooth fashion. It also has very high power handling. As such, the woofer requires no electrical crossover to reproduce dynamic, natural bass and mid-range frequencies in this model. To reproduce bass cleanly and powerfully, it is loaded at the rear with a port flared at both ends, which reduces turbulence and distortion.

The bi-wirable input panel is made from solid anodised aluminium alloy, with sturdy high-spec terminals suited for spade lug or other types of plugs. High-grade metal links join the terminals together and can be removed for separate connection to each driver.

Equally attractive with or without the silk cloth grilles, the M12i is offered in a choice of three beautiful real-wood veneers. It seamlessly wraps around the front edges of the pattern matched cabinets. The front and rear baffles are 25mm (1 in.) thick to reduce unwanted vibration and colouration.

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The new Epos M16i is a floor-standing 2 ½ - way speaker which excels in accuracy, dynamics, imaging and poise. This speaker was designed to be equally dynamic in a two-channel or home theatre application. The result is a loudspeaker with deep bass, a fast dynamic sound and very high power handling. It is equally at home playing music or movies and is of course magnetically shielded.

The revised Epos 25mm (1 in.) low distortion metal dome tweeter used in the M16i is designed for smooth, clear and extended treble. It features a strong die-cast aluminium alloy face plate, moulded surround, ferrite magnet and Ferrofluid cooling. The crossover is centred on 3kHz and incorporates film capacitors in critical locations.

The 140mm (5.5in.) mid-range driver, similar to that used in the M5i, runs in a sealed chamber, with the tweeter. It is designed to roll-off naturally around 90Hz, with useful output below that. The woofer and mid-bass output overlap and work effectively as one bigger unit. This reinforces the power and dynamics of this compact speaker.

The bass driver is similar to the midrange but has a dust cap instead of a phase plug. It is mounted in a separate chamber in the lower section of the cabinet and is loaded with a rear-firing port, flared at both ends for low turbulence and minimal distortion. It is also filtered by the crossover to limit frequencies above 100Hz.

Together, the woofer and mid-range units handle very high power. We recommended that the M16i should be partnered with an amplifier that is capable of driving a four Ohm load to high levels.

Internally, extensive bracing and 25mm (1 in.) thick front and rear baffles have been skilfully engineered to reduce unwanted cabinet vibration and colouration. The tri-wirable input panel is made from solid anodised aluminium alloy, with sturdy high-spec terminals suited for spade lugs or other types of plugs. High grade metal links join the terminals together and can be removed for separate connection to each driver.

Grilles are made of cloth, over an MDF frame, for easy integration with home furnishings, although the M16i is equally attractive without the grilles. A black lacquered integral plinth includes sturdy steel inserts which take adjustable 6mm carpet spikes (included). The plinth is removable if desired.

The M16i is offered in a choice of three beautiful real wood veneers, which seamlessly wrap around the front edges. Cabinets are grain-pattern matched on left and right speakers.

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The current flagship of the Mi range of speakers, the 2 ½- way M22i, has deeper bass and higher power handling than the M16i. In designing the M22i, the Epos engineering team designed a high performance two channel speaker that would be equally at home in a home theatre application.

The M22i uses the revised Epos 25mm (1 in.) low distortion metal dome tweeter, designed for smooth, clear and extended treble. The upper frequency crossover is centred on 5kHz and the minimalistic 1st order crossover is simply a polypropylene film capacitor.

Epos has designed a robust new 165mm (6.5in.) mid-range woofer with die-cast aluminium alloy chassis, phase plug and moulded polypropylene cone. Its curved cone profile and graduated thickness were engineered to 'roll off' high frequencies mechanically, in a smooth fashion. It also has very high power handling. As such, the woofer requires no electrical crossover (neither high pass, nor low pass) to reproduce dynamic, natural bass and mid-range frequencies in this model.

The mid-range driver runs in a sealed chamber, with the tweeter. It is designed to naturally roll-off around 80Hz, with useful output below that. The woofer and mid-bass output overlap and work effectively as one bigger unit. This reinforces the power and dynamics of this compact speaker.

The 165mm (6.5in.) bass driver is similar to the midrange but has a weighted dust cap instead of a phase plug. It is mounted in a separate chamber in the lower section of the cabinet and is loaded with a rear-firing port, flared at both ends for low turbulence and minimal distortion. It is also filtered by the crossover to limit frequencies above 100Hz.

Together, the woofer and mid-range units handle very high powers. We recommended that the M22i should be partnered with an amplifier that is capable of driving a four Ohm load to high levels.

The tri-wirable input panel is made from solid anodised aluminium alloy, with sturdy high-spec terminals suited for spade lug or other types of plugs. High grade metal links join the terminals together and can be removed for separate connection to each driver.

Great care has been taken with the manufacturing of the cabinets. They are grain pattern matched for each pair. Internally, extensive bracing and 25mm (1 in.) thick front and rear baffles have been skilfully engineered to reduce unwanted cabinet vibration and coloration. Grilles are made of silk cloth, over an MDF frame, for easy integration with home furnishings, although the M22i is equally attractive without the grilles. A black lacquered integral plinth, which includes sturdy steel inserts to take adjustable 8mm carpet spikes, completes the package.

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The M SUB has a powerful 10" loudspeaker driver fitted to the bottom of the cabinet, with 2" voice coil and large magnet size to handle very high power levels for long periods without distress. Its paper 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 enable the M Sub to integrate perfectly with a two-channel system that requires additional bass extension. However, it is also well suited to the needs of a 5.1 system and can provide exceptional bass extension for movies.

To further boost the fidelity the M SUB has a very stiff cabinet with extensive internal bracing and thick walls, which is rarely found in conventional subwoofers. It has a completely sealed section at the back of the cabinet to house its high powered 300 Watt amplifier. This technique is more normally found in professional speakers.

To further improve the sound quality Epos does not use port tuning to achieve increased bass extension. This helps to avoid air turbulence noises ('chuffing') from interfering with the fidelity of the loudspeaker. It also avoids the usual peak in bass at one frequency that usually characterizes the sound of inferior 5.1 type subwoofers.

As a general rule, stereo systems tend to be difficult to integrate with conventional sub woofers because, for the most part, sub woofers are generally not designed to match them, and therefore suit 5.1 systems only. The Epos M SUB is different and was conceived as a means of extending the frequency response of a small pair of bookshelf speakers, rather than just producing large outputs at one particular frequency, such as 60 Hz.

This may appear to contradict established principles, but Epos engineers have not limited themselves only to designing a product that plays 'one note' sound. For that reason the M SUB is capable of extending low frequencies with a relatively flat response down to 20 Hz. This is most unusual and would normally be unheard of in conventional woofers because, apart from anything else, their cabinets and amplifiers would rattle and buzz, due to the simple method of construction used. As a consequence of the design principles, this M SUB is exceptionally dynamic when part of a 5.1 system.

Back panel controls include variable Volume, Low Filter, High Filter and Phase adjustment controls. Low and High Level Inputs allow the M sub to be driven either from loudspeaker outputs direct from a power amp or pre-amp signal, which will not load the driving amplifier as the M sub's low level input is high impedance. Its Power Switch features a standby function that sends the amplifier to sleep when not used and wakes up automatically when it receives a signal. The amplifier is able to work in most regions as it has an AC Voltage Selector Switch and mains fuse, accessible from the rear panel.

Additional features to be found in the M Sub are over-current protection and over temperature cut-out. The M SUB does not use a compression limiter to pre-distort the signals it cannot handle. However, no amplifier has infinite power capabilities and has to be protected against destroying itself under extreme conditions.

With a cosmetic design similar to the M series range of speakers, the M SUB is available in the three finishes - light cherry, dark cherry and black ash.

The M Sub is designed to be a down firing speaker, with fixed height legs to stand on. These can be used on their own or with the matching wooden plinth that protects the driver and allows the driver to breath properly. 6mm carpet spikes or soft foam pads can be fixed to the bottom of the plinth, depending on the floor surface or personal preference.

EPOS M SUB.pdf

Designed to accommodate the smaller Epos bookshelf speakers – the ELS3 and M5, the ST35 metal stand is both elegant and functional and is available in a choice of either black or silver.

The Epos ST35 stands 56 cm high (without spikes) and has a solid top plate measuring 17 x 15.5 cm. The bottom plate measuring 25 x 28 cm features an Epos badge. Three columns make up the supports, the larger of which has the added advantage of a cable channel.

This particular model does not have provision for the addition of sand fill. The stands are supplied in a self assembly format complete with top and bottom spikes.

Product PDF: EPOS ST35 Stand
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This 3 column stand has been manufactured to provide an alternative to our popular ST12 frame stand for use with the Epos M12.2 speaker.

However it is not solely for use with Epos – having a solid top plate it lends itself to many other popular speakers which will perform better if placed on a solid well engineered stand.

Supplied as a multipart flat pack with easy to follow self-assembly instructions, the ST21 is available in either silver or black. It also has a cable channel but does not have any provision for sand filling.

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