Esoteric Esoteric MG-10 Manuale utente

9A10515500

Loudspeaker System

OWNER’S MANUAL

MG-10/MG-20

Thank you for choosing Esoteric. Read this manual

carefully to get the best performance from this unit.

<Choose the installation location of your unit carefully. Avoid

placing it in direct sunlight or close to a source of heat. Also

avoid locations subject to vibrations and excessive dust, heat,

cold or moisture.

<Keep this manual in a safe place for future reference.

MG-10

This model is designed to be placed on a loudspeaker stand.

A specially made Esoteric loudspeaker stand is available from

your dealer. This stand is supplied with fixing bolts and has

fixing holes in the top plate which match up with threaded

inserts in the bottom of the MG-10. Screw the loudspeaker

firmly to the stand using the fixing bolts and washers

provided. Do not overtighten the bolts. If using an alternative

loudspeaker stand the height of the stand should be chosen

so that the ears of people in the normal listening position are

at approximately the same height as the centre of the

tweeter. The loudspeaker should be secured to the top plate

of the stand by suitable adhesive pads or small balls of Blu-

Tack, or by the method recommended by the stand

manufacturer.

MG-20

This model is designed for floor mounting on carpet or bare

wooden floors. Screw the four carpet piercing spikes

(supplied in the accessory pack) into the bottom panel of each

cabinet to get the best sound quality, adjusting the length of

the spike to ensure stability on uneven floors. Lock the spikes

with the locknuts supplied. The spikes are designed to avoid

damage to the carpet as they penetrate the woven backing of

the carpet. For bare wooden floors the spikes should rest on

the metal cups provided to protect the floor. The ideal

listening position is where the listener’s ears are at

approximately the same height as the centre of the tweeter.

MG-20 Optional Accessory Plinth

A specially designed Esoteric Performance Platform is available

from your dealer for model MG-20 to improve stability and

sound quality. The Platform bolts onto the bottom of the

loudspeaker using the threaded inserts provided for the

spikes.

Before Use Initial Positioning

Initial Set Up

Amplifier Matching

Locate the loudspeakers so that the favourite listening position is

approximately 15° from the front to back axis of each cabinet.

The axes of both cabinets should intersect at a point slightly in

front of the listening position. Remember that the proximity of

the loudspeakers to walls and corners will affect the sound.

Some experimentation will probably be needed to fine-tune the

stereo image depth and low frequency sound quality.

Loudspeaker positions which are close to walls or in room

corners have the effect of increasing and unbalancing low

frequency sound energy and adjacent reflective walls may upset

the stereo image accuracy and width by causing unwanted

reflections.

The loudspeakers are designed to be used at least 1m from any

sidewall or reflective surface and at least 0.5m away from a rear

wall. Only at these distances or greater from side and rear walls

will their exceptional stereo image depth capabilities be realised.

Consult the product specification page as this clearly shows the

acceptable power range for amplifier matching to your

loudspeakers. The high peak power handling of Esoteric

loudspeakers permits responsible use with more powerful

amplifiers.

As with all loudspeaker systems, power handling is a function of

voice coil thermal capacity. Care should be taken to avoid

overdriving or overloading the amplifier as this will cause

“clipping” or distortion of the output signal. If overload

distortion or clipping lasts for any extended period it will cause

damage to the loudspeakers.

Generally an amplifier of higher power that is operating well

within its power limit and therefore free from distortion will do

much less damage to the loudspeaker than a lower power

amplifier operating at its power limit producing clipping

distortion. Also, a high powered amplifier running at less than

50% to 90% of output power generally sounds a great deal

better than a lower powered example struggling to achieve

100%. An amplifier with insufficient drive capability will not

allow the full performance of the loudspeakers to be realised.

Cable Choice Connecting your Loudspeakers

Terminal Panel

FIG. 1

FIG. 2

Always use the best quality of cable available within your

budget. High quality audio signals passing from the amplifier to

the loudspeaker are unusual in their demands on the cable.

Wide dynamic ranges of greater than 100dB and frequency

bandwidth information ranging over 9 octaves have to coexist

with the ability to transmit peak currents of at least 10 amps, all

without incurring any loss or signal impairment. This is one

reason why the sound quality of the information reproduced by

the loudspeakers is so dependant on the physical properties of

the cables connecting them to the amplifier.

Another reason for special loudspeaker cables concerns Radio

Frequency Interference (RFI). There are many very strong Naval

and Maritime radio signals availabe nearly everywhere in the

world and these can be tuned by simple loudspeaker cables in

combination with passive crossover components and voice coil

inductance. RFI energy can be fed back into the amplifier output

stage circuits, demodulated and find its way into the feedback

loop causing considerable loss of sound quality.

MG-10 and MG-20 loudspeakers have special internal wiring

which connects the grounding terminal on the rear terminal

panel to the metal chassis and magnet system of the drive units,

thereby screening the voice coils. This effectively shields the voice

coils and any interfering RFI picked up inside the loudspeaker. To

take advantage of the driver grounding feature and to optimise

performance, use a low capacitance shielded or screened

loudspeaker cable. The screening termination or drain wire

should be connected to the “ground” (green) terminal at the

loudspeaker end of the cable and to the ground or chassis

connection at the amplifier end of the cable (Figure 1).

If you are not using a screened loudspeaker cable but wish to

benefit from the grounding facility, run a single cable between

the “ground” (green) terminal on the loudspeaker to the ground

or chassis connection on the amplifier.

Connection in Single Wire Mode

<Locate the 2 wire links in the accessory pack. Each link has a

4mm sleeve at each end. Referring to Figure 2, Link the HF+

and LF+ terminals and HF- and LF- terminals as shown.

<Take hold of the loudspeaker cable from the amplifier and fit

the red (positive) lead into the red (positive) high frequency

(HF+) terminal on the loudspeaker.

<The cable at the other (amplifier) end of the lead should be

connected to the red (positive) terminal on the amplifier.

<Repeat this operation at the loudspeaker end of the cable for

the black (negative) high frequency (HF-) terminal, and then

at the other end of the cable connect to the black (negative)

terminal on the amplifier.

<Repeat the whole operation for the other loudspeaker.

<Check all connections carefully making sure that red cable

connects to red terminal, black to black. If your cable is not

colour coded make sure that the positive terminal from the

amplifier connects through the appropriate part of the cable

to the positive (HF+) terminal on the loudspeaker and the

negative terminal on the amplifier connects through the cable

to the negative (HF-) terminal on the loudspeaker.

Choosing the HF terminals for single wire mode has been found

to give the best sound quality. Note that most loudspeaker

cables have directional properties and give their best sound

quality when arrows printed on the cable point from the

amplifier to the loudspeaker.

Select a signal source, such as a CD player; switch on the

amplifier and slowly turn up the volume control to check that

both loudspeakers are reproducing bass and treble information

by listening closely to the woofer and then the tweeter at a low

volume setting.

To avoid potential damage to your loudspeaker, ensure that the

amplifier is switched OFF prior to connecting or disconnecting

any cables. Before switching on double check that all

connections are secure and that polarity is correct.

HF-

LF-

HF+

LF+

High Frequency

Positive (+) Terminal

Low Frequency

Positive (+) Terminal

“Earth” or “Ground” Terminal

High Frequency

Negative (–) Terminal

Low Frequency

Negative (–) Terminal

HF-

LF-

HF+

LF+

POWER AMPLIFIER

To “Ground” or

“Earth” Connection

on Amplifier (Optional)

To Right

Speaker

+– +–

Connection in Bi-Wire Mode

Note: The link cables in the accessory pack are not used for Bi-

wire mode.

<Be sure that the amplifier is switched OFF and then prepare

the two sets of cabling for each “side” of the system

separately.

<Measure and cut four lengths of cable, two lengths for each

loudspeaker. Label two of the cable lengths Left LF and Left

HF (low frequency and high frequency) then repeat this

process with two lengths of cable for the right side, Right LF

and Right HF.

<If your amplifier is not equipped with separate output

terminals for bass and treble information then, at the

amplifier end of the cables, twist the Left LF+ (positive) and

the Left HF+ (positive) conductors together. Connect these to

the amplifier Left channel positive terminal marked + (plus) or

coloured red. Next, twist the Left LF- (negative) and the HF-

(negative) cables together and connect them to the amplifier

Left channel negative terminal marked - (minus) or coloured

black. At the loudspeaker end connect the cables labelled Left

LF+ and Left LF- to the left hand loudspeaker LF terminals,

ensuring that you note the polarity markings on the cable

sheathing. Then proceed to connect the Left HF+ and Left HF-

to the HF terminals on the same loudspeaker.

<Repeat this process to connect the right hand loudspeaker to

the amplifier right channel output, once again ensuring that

polarity is correct throughout.

Switch the amplifier on with the volume control set at its lowest

setting. Select a favourite source and slowly turn up the volume

to a low level. Check that bass and treble information is being

reproduced from both loudspeakers by listening closely to the

woofer and then the tweeter at a low volume setting. If there is

a problem, switch off the amplifier and recheck the connections.

Connecting your Loudspeakers

Connection in Bi-Amp Mode

Note: The link cables in the accessory pack are not used for Bi-

amp mode. If you are converting from Single-wire mode, remove

the link cables now, otherwise amplifier damage could result.

Bi-Amping extends the principle of bi-wiring one stage further.

In this connection option separate power amplifiers are used for

bass and treble signals in each loudspeaker. Four mono (or two

stereo) amplifiers of the same type and identical electronic

design are required for a stereo pair of loudspeakers operating in

Bi-amp mode.

<Ensure that any cable links between the loudspeaker HF+ and

LF+ or HF- and LF- terminals are removed or amplifier damage

may result.

<Ensure that correct polarity is maintained throughout.

<If two stereo amplifiers are used (instead of 4 separate

amplifiers), it is recommended that one amplifier supply bass

information to left and right loudspeakers and the other, the

treble information.

<Avoid potential damage to your amplifier - ensure that all

connections are secure and the polarity is correct in all wiring.

HF-

LF-

HF+

LF+

POWER AMPLIFIER

To 'Ground' or

'Earth' Connection

on Amplifier (Optional)

Links Removed

To Right

Speaker

+– +–

HF-

LF-

HF+

LF+

High Frequency

POWER AMPLIFIER

Low Frequency

POWER AMPLIFIER

To “Ground” or

“Earth” Connection

on High Frequency

Amplifier (Optional)

Links Removed

+– +–

To Right

Speaker

To Right

Speaker

FIG. 4

FIG. 3

Grille Removal

Special acoustically transparent cloth is used in the grille

assembly. However for the very best performance, you may wish

to remove the grilles. The grille is fixed to the cabinet by dowel

pegs mounted in the back face of the grille and sockets

mounted in the front of the loudspeaker. The MG-10 has 2 pairs

of dowel pegs, top and bottom. The MG-20 has 3 pairs of dowel

pegs, top, lower middle and bottom. To remove the grille pull

gently on the grill close to each pair of dowel pegs and when

movement is detected, move to another pair of dowel pegs.

Repeat this operation until all the grille pegs have disengaged

with their respective sockets.

Proximity to Televisions & Monitors

The Low Frequency Section

Running In

The High Frequency Section

Loudspeaker drive units contain powerful magnets. These are

capable of generating a substantial magnetic field extending a

considerable distance beyond the sidewalls of the loudspeaker

enclosure. This field can cause picture distortion if the

loudspeakers are placed too close to a television or monitor

using a Cathode Ray Tube (CRT).

For this reason, the MG-10 or MG-20 should be placed no closer

than 1.0m (3.25 ft.) from a television or monitor using a CRT. If

a CRT television or monitor is accidently placed too close to a

loudspeaker and the colour values are upset, carry out the de-

gaussing procedure by referring to the television or monitor

instruction manual. Plasma and LCD screens are not affected by

magnetic fields and do not have this problem.

Like all loudspeakers, the drive units in your Esoteric

loudspeakers will take a while to reach optimum performance,

as the stresses created in the materials during manufacturing

processes relax - especially in the suspension systems. For this

reason, it is beneficial to run the system at fairly high levels at

normal room temperature, for approximately 20 hours to

achieve best results.

The high frequency diaphragm is a similar high temperature

deep draw Magnesium pressing but 10 times thinner resulting in

an ultra lightweight structure of immense stiffness. The

diaphragm is suspended by a miniature roll surround for good

damping and low free air resonant frequency and coupled to a

rigid aluminium voice coil suspended in a high flux magnetic gap

provided by a neodymium magnet structure. The rear of the

diaphragm vents through to a damped rear chamber to define

the low frequency response of the HF unit and which absorbs

the rear acoustic radiation to prevent interference with the main

forward facing acoustic energy pattern.

Extraordinary new developments in high temperature deep

drawing and pressing of Magnesium foil have led to the

development of a cone piston and dust cap of near perfect

acoustic qualities. Magnesium offers optimised mass, internal

damping, rigidity and a selective speed of sound through the

material to give a superb standard of reproduction which is

immediately obvious from the first audition of the loudspeaker.

In addition the Magnesium components are treated with a high

temperature resistant coating to protect them from oxidation

and to enhance the acoustic characteristics. The permanent

magnet motor drive system is fitted with two sets of flux control

devices which linearise the voice coil inductance and reduce odd

order distortion components. Complementary linear front and

rear suspension systems complete the low frequency drive unit

which is housed in a rigid diecast chassis and connected through

a selectively absorbent damping mechanism through to the

cabinet bracing structure. The cabinet volume is ported to

provide ideal damping and low frequency extension resulting in

a very fast and detailed bass response.

During the design of the crossover network the acoustic,

mechanical and electrical interactions of the high and low

frequency sections have been fully analysed. The crossover is

therefore an integral part of the design of the system. The

crossover network provides complex equalisation in both

amplitude and phase for both LF and HF drive unit and fully

integrates the response at the crossover point.

All components are high precision, low-loss and thermally stable.

Very high quality specially damped and treated audio grade

polypropylene capacitors are used for the high frequency feed.

Large, low hysteresis laminated iron core inductors avoid

distortion and saturation effects. The individually hard wired

components are laid out to minimise inter component coupling

and are placed well away from the driver magnetic field. Van

den Hul high purity silver-plated copper wiring is used

throughout the internal connections in the loudspeaker.

The Crossover Network

The cabinet carcass is constructed from 15mm birch plywood

with a 30mm birch plywood front baffle. Carefully selected solid

hardwood mouldings and veneers have been hand finished to

exacting standards. The wood should only be cleaned with a dry

cloth or with a light application of quality non-silicone furniture

polish, taking care not to get polish on the grille cloth or any

part of the HF and LF drive units.

In common with all solid wood furniture, exposure to extremes

of heat, cold and varying humidity will cause the wood to ease

slightly. Therefore it is recommended that the loudspeaker is

protected from environmental extremes to guard against any

such occurrence. Any wood will change colour when subjected

to the UV content of ambient light. Although the cabinet is

protected by an anti ultra violet lacquer, a light veneer such a

Cherry will darken naturally over time to a rich natural golden

colour.

Care of the Cabinet

Faultfinding

Esoteric loudspeakers are designed and manufactured to be

reliable. When a fault occurs in a hi-fi system the effect is always

heard through the loudspeakers although they may not be the

source of the fault. It is important to trace the cause of the

problem as accurately as possible. A fault heard on one source

only (for example CD or Phono for instance) is most unlikely to

be a loudspeaker problem. Loudspeakers do not in themselves

generate hum, hiss or rumble although high quality, wide

bandwidth loudspeakers may emphasise such problems.

Quality

The manufacture of Esoteric loudspeakers follows a policy of

stringent quality control procedures using sophisticated

measurement facilities. All drive units are designed and

manufactured specifically for the MG-10 and MG-20 models. All

incoming parts are thoroughly tested to ensure that they are as

specified. Not only is all data computerised, but rigorous testing

procedures during construction ensure every loudspeaker meets

or exceeds our exacting standards.

Caution

The high peak power handling of Esoteric loudspeakers will

allow responsible use with larger amplifiers on wide dynamic

range material. Take care with any amplifier, irrespective of

power output, to avoid abnormal conditions such as switch on

surges or output overload (clipping) that may result in peaks of

power measuring greatly over the rated output.

Technical Specifications

MG-10

Dimensions (H x W x D) . . . . . . . . . . . . . 440 x 216 x 271 mm

(17-5/16 x 8-1/2 x 10-11/16”)

Enclosure Volume. . . . . . . . . . . . . . . . . . . 13 litre (7/16 cu.ft.)

Enclosure Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Reflex

Enclosure Weight . . . . . . . . . . . . . . . . . . . 7.5 kg (16-1/2 lbs)

Cabinet Construction . . . . . . . . . . High density birch plywood

Internally crossbraced and heavily damped

Recommended Amplifier Power . . 20 to 120 watt per channel

Power Rating . . . . . . . . . . . . . . . . . . . . . . . . . . . 75 watt RMS

300 watt peak

Sensitivity . . . . . . . . . . . . . . . . . . . . . . 87.5 dB for 2.83 volt at

1 metre, half space

Nominal Impedance . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 ohm

Minimum Impedance . . . . . . . . . . . . . . . . . . . . . . . . 3.8 ohm

Frequency Response (-6dB) . . . . . . . . . . . . . . . 41 Hz - 44 kHz

Crossovere Frequency. . . . . . . . . . . . . . . . . . . . . . . . . 1.9 kHz

Crossover Type . . . . . . . . . . . . . . . . 2nd order LF, 3rd order HF.

Bi-Wired, Hard-Wired passive, low loss.

Driver Type . . . . . . . . . . 165mm (6-1/2”) magnesium cone LF

25mm (1/2”) magnesium dome HF

MG-20

Dimensions (H x W x D) . . . . . . . . . . . . 1060 x 216 x 271 mm

(41-3/4 x 8-1/2 x 10-11/16”)

Enclosure Volume . . . . . . . . . . . . . . . . . . 21.5 litre (3/4 cu.ft.)

Enclosure Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Reflex

Enclosure Weight . . . . . . . . . . . . . . . . . . . . . . . 15 kg (33 lbs)

Cabinet Construction . . . . . . . . . . High density birch plywood

Internally crossbraced and heavily damped

Recommended Amplifier Power . . 20 to 170 watt per channel

Power Rating . . . . . . . . . . . . . . . . . . . . . . . . . . . 90 watt RMS

360 watt peak

Sensitivity . . . . . . . . . . . . . . . . . . . . . . . 89 dB for 2.83 volt at

1 metre, half space

Nominal Impedance . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 ohm

Minimum Impedance . . . . . . . . . . . . . . . . . . . . . . . . 3.7 ohm

Frequency Response (-6dB) . . . . . . . . . . . . . . . 38 Hz - 44 kHz

Crossovere Frequency. . . . . . . . . . . . . . . . . . . . . . . . . 1.9 kHz

Crossover Type . . . . . . . . . . . . . . . . 2nd order LF, 3rd order HF.

Bi-Wired, Hard-Wired passive, low loss.

Driver Type. . . . . . . . 2 x 165mm (6-1/2”) magnesium cone LF

25mm (1/2”) magnesium dome HF

For European Customers

Disposal of your old appliance

1. When this crossed-out wheeled bin

symbol is attached to a product it

means the product is covered by the

European Directive 2002/96/EC.

2. All electrical and electronic products should be disposed of

separately from the municipal waste stream via designated

collection facilities appointed by the government or the

local authorities.

3. The correct disposal of your old appliance will help prevent

potential negative consequences for the environment and

human health.

4. For more detailed information about disposal of your old

appliance, please contact your city office, waste disposal

service or the shop where you purchased the product.

0207.MA-1204A

This appliance has a serial number located on the rear panel. Please record

the model number and serial number and retain them for your records.

Model number Serial number

TEAC ESOTERIC COMPANY 3-7-3, Nakacho, Musashino-shi, Tokyo 180-8550, Japan Phone: (0422) 52-5132 e-mail: [email protected]

TEAC AMERICA, INC. 7733 Telegraph Road, Montebello, California 90640 Phone: (323) 726-0303

TEAC CANADA LTD. 5939 Wallace Street, Mississauga, Ontario L4Z 1Z8, Canada Phone: (905) 890-8008

TEAC MEXICO, S.A. De C.V Campesinos N°184, Colonia Granjas Esmeralda, Delegacion Iztapalapa, CP 09810, México DF Phone: (525) 581-5500

TEAC UK LIMITED Unit 19 & 20, The Courtyards, Hatters Lane, Watford, Hertfordshire, WD18 8TE, U.K. Phone: (0845) 130-2511

TEAC EUROPE GmbH Bahnstrasse 12, 65205 Wiesbaden-Erbenheim, Germany Phone: 0611-71580

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