JAMO E 7SUB Manuel utilisateur

Technical Description

Jamo E 7 system

Version 1.0

Technical Description

Jamo E 7 System

Contents:

1. General system description

2. The products:

2.1. E 700

2.2. E 750

2.3. E 770

2.4. E 7CEN

2.5. E 7SUB

3. Driver explanation

3.1. Tweeter

3.2. Midrange/Woofers

3.3. (Sub) woofer

4. Cabinets

Page

5. Technical specifications

1. General description

The goal with our new E 7 series loudspeakers has been to bring audiophile quality

loudspeaker technology to the mass market. Furthermore our requirement from the start

has been that this new series should perform equally well with music as movies and have

the eye pleasing aesthetics that allow most people to integrate these loudspeakers in their

everyday living rooms without sacrificing their interior decor. A task that proved to require

new and ingenious solutions as well as ground breaking technology from our EISA award

winning D 7 series.

These are loudspeakers designed by engineers with a

passion for music in all its forms. Anybody who listens to

these designs will hear that. We wanted this new range to

exceed all sonic expectations in the class… we think that’s

exactly what it does.

One of the biggest challenges when designing speakers is

preventing unwanted cabinet vibrations from clouding or

colouring the sound. High frequencies are particularly

susceptible so we came up with the first ingenious

solution… Decoupled Tweeter Technology (DTT). Exploded view of the Decoupled

Tweeter Technology.

By decoupling the tweeter from the rest of the

loudspeaker, vibrations transmitted from the front baffle to the tweeter are reduced by

more than 20 dB resulting in

an uncommonly detailed and

realistic reproduction of high

frequencies.

Firstly the tweeter is

decoupled from the

aluminium front baffle using a

special rubber compound

called EPDM (Ethylene

Propylene Diene Monomer)

which has extremely good

acoustical properties.

Secondly the aluminium front

baffle is not just screwed onto

the wooden front baffle but

mounted using natural rubber

rawlplugs which further

prevents vibrations being

transmitted.

Wooden front baffleWooden front baffle

Dif

erence between vibrations in a normal front baf

le and vibrations

in a front baffle employing Decoupled Tweeter technology.

The loudspeaker cabinets themselves are constructed from solid MDF and the front baffle

is angled by 2 degrees in order to further enhance the rigidity of the cabinets. The two

floorstanding models in the range also have internal bracings adding further to the

structural stiffness of the whole construction. Please refer to section 4 for more information

about the cabinets.

2. The products

2.1 E 700

E 700 is a very compact 2-way bass reflex speaker with a 4” mid/woofer and a 1” soft dome

tweeter using our new DTT (Decoupled Tweeter Technology), see more details about DTT

and the drive units below.

The compact drivers improve the dynamics: As they weigh less they can move faster. Of

course under the precondition that they are equipped with

very powerful motors (magnet/voice coil) as is the case here.

The crossover frequency is 2,500 Hz.

Every diaphragm has a break up point and it is important

that the driver is used in a range where break ups are

controllable or do not appear. By choosing newly developed

drive units made from a special fibre glass and glue

compound, we have eliminated many of the known

challenges regarding break-ups in the diaphragm material.

For example the inevitable diaphragm break ups can be

controlled and distributed more evenly across the whole

diaphragm thereby avoiding uncontrolled colouring of the

sound at certain frequencies.

Decoupled Tweeter Technology

solid aluminium front baffle.

When used as a surround speaker in an E 7 solution, the E

700’s voicing ensures that seamless timbre matching is

guaranteed when the sound pans across the room.

2.2 E 750

E 750 is a tall slim line 3-way speaker utilising a bass reflex system and a rear firing woofer.

The E 750 is equipped with the same 1” soft dome DTT tweeter as found in the E 700, and

the rest of the series for that matter. The bass/midrange

driver is a 5¼” and the rear firing woofer is a 5½”.

The crossover frequencies are 150 Hz and 2,500 Hz.

The rear firing woofer on the E 750/E770 have been

specifically designed to deliver increased bass output but

with a very linear response, even when placed relatively

close to a wall. Furthermore this design will result in a

general level of 3-6 dB increased output (depending on the

distance from the front wall and the side walls) which means

that the drive unit can obtain the same relative volume level

but with less excursion, thereby minimising the overall

distortion. Rear firing woofer on E 750/E 770.

The low crossover frequency of the woofer (150 Hz) also make sure that the drive unit

performs in the frequency range were it is designed to perform best, delivering a deep

powerful bass equally at home with music and movies.

2.3 E 770

The range-topping floorstanding model in the E 7 series is the E 770, similar in proportion

and driver complement to the E 750 but physically larger at nearly 1m high and even

better endowed in the driver

department. The same 1” DTT

tweeter is used, naturally, but

here it’s partnered with a

front facing 6½” mid/bass

unit and a ported 6½” woofer.

The crossover frequencies are

similar as with the E 750 150

Hz and 2,500 Hz.

By utilising a rear firing

woofer on the E 750/E 770 the

in room bass response is also

easier to control as the

natural quarter wave

frequency cancellation is

minimised.

Front firing woofer

Rear firing woofer

Front firing woofer

Rear firing woofer

The in room frequency response of a traditional front firing woofer

and a rear firing woofer respectively.

This model offers a low frequency response that reaches down to 35 Hz, allied to 90 dB

sensitivity.

2.4 E 7CEN

Vocal clarity is all important in any centre-channel loudspeaker so using the Decoupled

Tweeter Technology in the E 7CEN was the natural step. Here for timbral accuracy, it’s

partnered by a pair of the same 4” mid/bass drivers you’ll find in the E 700 and augmented

with a flowed port at the rear

The crossover frequency is 2,500 Hz.

With a height of just over 14 cm the E 7CEN is extremely compact and thereby easy to

place in the listening room.

2.5 E 7SUB

The E 7SUB is equipped with a very powerful 10”

woofer and equipped with a solid class AB amplifier,

capable of delivering peak power of up to 675 watt.

Thanks to the heavy MDF board sealed cabinet, the

powerful amplifier and the high excursion woofer, the

E 7SUB delivers a deep, precise and detailed

reproduction of the low register - perfectly matching

the sound from the rest of the E 7 series.

With a frequency response that reaches down to 25

Hz the E 7SUB is not only designed for movies but for

music too. This subwoofer is just as comfortable

portraying subtle musical nuances as it is churning

out high-level gunfire, explosions and earthquakes.

E7SUB

However, under certain circumstances the capability of being able to reproduce very low

frequencies can create a problem, which is why we have chosen to implement the

Boundary Gain Compensation technology also found in our EISA award winning D 7SUB.

Boundary Gain Compensation compensates for the room influence at low frequencies, as

any room amplifies the lowest frequencies.

The Boundary Gain Compensation starts at

55 Hz -3dB and drops to –10 dB at 25 Hz.

Off

The magnitude of the room’s amplification

depends on the room and where you are

positioned – normally it increases the closer

you get to a wall, which also means that the

problem get worse the smaller the room.

This can result in too high bass level from

approx. 60 Hz and increasing downwards. In

the range between 20-30Hz it peaks up to 5-

10dB in an average room.

Illustration of how the Boundary Gain

Compensation technology works. Note that in both

off positions the peak around 20-30 Hz is much

higher than 40-100 Hz, whereas in the on position

the bass response is more linear.

At first impression this could sound really

impressive, but especially when listening to

music the sound can be “boomy” and rather

annoying.

With the usual adjustment possibilities such as cut-off frequency and volume level it will be

impossible to obtain a linear in-room frequency response. However the Boundary Gain

Compensation switch will allow an additional fine tuning possibility which will

compensate non optimal placement of the listening position in most rooms.

Boundary Gain Compensation together with

the normal set of controls (phase, cut-off

frequency and volume level) makes it easier

to integrate the E 7SUB in your listening room

no matter whether you are using large

floorstanding speakers like the E 770 or small

high quality compact speakers such as the E

700.

Most of today’s subwoofers have an auto

on/standby feature whereby the subwoofer

switches itself on if it senses a signal and

switches in standby mode again a certain

time after it has last sensed a signal. However,

in movies (or typically classical music) with

relatively quiet passages many subwoofer

tends to switch to standby mode thereby “missing” the start of a new action packed

sequence like for example an explosion or a kettledrum. Besides the auto on/standby

mode we have therefore implemented a mode were the subwoofer is always on.

Extensive range of adjustmen

possibilities,

including Boundary Gain Compensation, on the E

7SUB

3. Driver explanation

3.1 Tweeter

The new 1” soft dome DTT tweeter chosen for the E 7 series features an extremely efficient

neodymium magnet (10 times more powerful than a conventional magnet). Because the

magnet can be reduced in size, it can be placed inside the voice coil of the loudspeaker

unit, allowing the magnet force to be concentrated around the voice coil – exactly where it

is needed.

Furthermore, the use of a neodymium magnet was required on the E 7 series because of

the limitations in space and weight for the realisation of the Decoupled Tweeter

Technology. Please refer to the exploded view of the DTT principle on page 3.

3.2 Midrange/Woofers

The 4”, 5¼, 5½ and 6½” midrange/woofers found in the E 700, E 750, E 770 and the E 7CEN

feature diaphragms made of a special fibre

glass/glue compound. This material helps to

control and distribute wave modes evenly,

thereby ensuring minimal coloration and a very

transparent midrange.

The natural rubber surround we use linearises

frequency response yet further.

3.3 (Sub)Woofer

The 10” woofer features an air dried paper cone

with a massive surround allowing and a very

powerfull double magnet for high excursion

with minimum distortion.

Drive units made from woven fibre glass/glue

compound with natural rubber surround.

4. Cabinets

The MDF board used for the E 700 and the E 7CEN is 16mm thick all around. This together

with the compact size, the solid brushed aluminium front baffle, the 2 degrees angle of the

front baffle and the Decoupled Tweeter Technology makes for a very resonance dead base

for the drivers to work in.

The E 750 and E 770 employ 19mm MDF board. Furthermore we have made the cabinet

even more inert by adding internal bracings and at the same time a separate enclosure for

the mid/bass drivers.

The E 7SUB utilises 22mm MDF board all round. This together with internal bracing and a

separate enclosure for the electronics makes for a very solid cabinet with a minimum of

cabinet vibrations. As with the rest of the E 7 series the front baffle is angled 2 degrees for

even more rigidity.

5. Technical specifications

00 Dark Apple

E 7CEN

E 700

E 750

E 7SUB

E 7

E 700 E 750 E 770 E 7CEN E 7SUB

System Basreflex Basreflex Basreflex Basreflex Closed

Woofer 4” 5 ½” 6 ½“ 2 x 4” 10”

Midrange 5 ¼“ 6 ½”

Tweeter 1” (neodyn.) 1” (neodyn.) 1” (neodyn.) 1” (neodyn.)

Long term power (W) 100 140 150 100

Short term power (W) 140 200 220 140

Sensitivity (dB/2.8V/1 m) 85 89 90 87

Frequency range (Hz) 70-20k 42-20k 35-20k 80-20k 25-150

Crossover frequency (Hz) 2500 150-2500 150-2500 2500

Impedance(Ohm)666622k

Phase Adj. 0-180 deg.

Cut off frequency (Hz) 40-150

Amplifier rated output (W) 675 W peak

Limiter Yes

Boundary gain compensation Yes

Weight kg/lb 3.0/6.6 14.5/31.9 17.2/37.9 5.8/12.8 21.0/46.3

Dimensions (H x W x D)

mm/in

140x238x165

5.5x9.4x6.5

185x912x315

7.3x35.9x12.4

195x998x320

7.7x39.3x12.6

440x142x170

17.3x5.6x6.7

375x375x375

14.8x14.8x14.8

Finish Dark Apple/Light Apple/Black Ash

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