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Jamo c 80 series
Danish Sound Design
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Jamo C 80 page 0ꢀ
spelt with a capital c as in concert
C 803 / C 803 IW
Made for more ...
Like the whole c 80 range, c 803 is constructed with arch-shaped
sides that, together with internal bracing, makes the cabinet
extremely rigid. This ensures a clean and well-defined reproduc-
tion of midrange detail.
if you want a fully integrated sound solution then consider our
c 803 iW, which is an identical in-wall version of c 803. c 803 iW
is supplied with both a paintable grill and a black front cloth.
C 80 CEN
Screened for the screen
c 80 ceN uses the same tweeter as the rest of the c 80 range to
achieve optimum vocal clarity, partnered by a pair of the same driv-
ers used in c 805 and c 80 sUr for maximum timbral accuracy. Natu-
rally the c 80 ceN centre speaker is magnetically shielded to avoid
image distortion, when used in combination with a traditional crT
television. Thanks to the rubber cradle it is easy to adjust the angle
of the speaker in relation to your listening position.
C 80 SUR
Welcome to reality
if you want to create the perfect surround sound experience it’s vital that the rear speak-
ers generate sound diffusely. The c 80 sUr add to this experience by performing as left
and right surround speakers to create the perfect interaction with the front speakers.
To improve the performance of the dipolar arrangement Jamo has developed the
unique eXtended Bass Response (XBr) system. This allows the c 80 sUr to combine
the best from both bipolar and dipolar configurations.
if you wish an even more discreet surround solution you may alternatively consider
the unique in-ceiling surround speaker sU6.521K4 from our custom program. This
would work perfect with e.g. c 803 iW as front speaker.
C 80 SUB
How low can you go?
c 80 sUB is a front and rear-firing subwoofer equipped with two 254mm/10mm
aluminium cone woofers in a closed cabinet.
The heart of this low frequency power plant is a 1800W BasH amplifier,
which should be more than enough for both the most demanding mu-
sic lovers and serious film fans everywhere. With c 80 sUB you not only
get the traditional options of adjusting and fine tuning your subwoof-
er’s sound level, phase and cut-off frequency, you also get a variable
boundary gain compensation, giving you the opportunity to offset the
harmful effects that a room can have on sound at the lowest frequency
levels. c 80 sUB also features Motional Feedback (MFB) technology
which results in a very accurate and dynamic sound.
c 80 sUB also features a 12V trigger input, so it can be turned on and
off from a a/V receiver/controller that has a 12V output, ensuring that
the subwoofer always will be active when the a/V receiver/controller
is turned on.
Black ash
Dark apple
White (c 803 iW)
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spelt with a capital c as in concert
c 803
c 803
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Jamo C 80 page 0ꢁ
Jamo Tech platforms
WaveGuide
DTT (Decoupled Tweeter Technology)
WaveGuide refers to the unique way Jamo has shaped the tweeter’s face-
plate. The result is a controlled sound pattern with a more open and dynamic
reproduction of sound. WaveGuide makes it easier to position the speakers
in the room.
DTT* (Decoupled Tweeter Technology) is a remarkable mounting system
specially developed by Jamo.
one of the biggest challenges when designing speakers is preventing unwanted
cabinet vibrations from clouding or colouring the sound. High frequencies are
particularly susceptible. This problem is solved using the ingenious Jamo DTT.
By decoupling the tweeter from the rest of the loudspeaker, vibrations trans-
mitted from the front baffle to the tweeter are reduced by more than 20dB
resulting in an uncommonly detailed and realistic reproduction of high fre-
quencies.
another big challenge is to secure a uniform dispersion pattern in the tre-
ble and midrange frequencies. in general, dispersion gets narrower at high-
er frequencies. consequently in the area where the mid/woofer and the
tweeter should integrate smoothly, the mid/woofer has a narrow dispersion
and the tweeter has a wide dispersion. This problem is solved with the Jamo
WaveGuide. The completely smooth design of the WaveGuide also reduces
diffraction to an absolute minimum. Finally, the WaveGuide increases treble
output in the lower treble range which means the tweeter needs less power for
the same sPL. so, power handling is improved and distortion is reduced.
* Patent pending
dB
dB (sPL)
125
120
120
115
110
105
100
95
110
100
▲ on-axis
90
▼ off-axis
80
70
60
50
40
30
90
85
80
75
70
Normal face plate
60.0 100.0
DTT
WaveGuide
200
Normal tweeter
overplot
20
1000.0
100
500
1k
2k
5k
10k
20k
Difference between vibrations in a normal face-plate and vibra-
tions in a face-plate employing Decoupled Tweeter technology.
The WaveGuide results in a uniform treble dispersion pattern from
10kHz all the way down to the critical x-over point at 2kHz and thus
secures a seamless transition to the mid/woofer – both when listen-
ing on and off axis.
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Jamo Tech platforms
Centre-Plug
HCC (Hard Conical Cone)
The centre-Plug replaces the traditional dust cap, making the cone both lighter
and more responsive, while also cooling the voice-coil, resulting in a higher
power handling and a stable sound reproduction when playing loud. The de-
sign allows increased power-handling capabilities along with a more uniform,
precise and dynamic reproduction of sound.
The Hcc technology (Hard conical cone) enables the driver to reach far beyond
midrange frequencies before any significant cone break-ups occur. The mate-
rial’s rigidity and the membrane’s conical shape ensures the unit creates clear
and detailed sound with very little distortion, even at high sound pressures.
This combines with the natural rubber suspension, which effectively prevents
vibrations from travelling back to the diaphragm, the result being a very well-
controlled diaphragm that operates without break-ups up to 4kHz -well beyond
its working range.
The centre-Plug also prevents potential break-up points where the dust cap
would have been glued to the cone. in addition, it prevents over- and under
pressure behind the dust cap when the cone moves back and forth.
The advantage is more dynamic and precise sound reproduction.
0.00
0.50
1.00
1.50
2.00
dB
25.0
20.0
15.0
10.0
5.0
2.50 msec
mLssa
1k
2k
cumulative spectral Decay ieX Frequencies - Hz
dB (sPL)
Jamo Hcc operates without break-ups in critical areas.
100
95
90
85
80
75
0.00
0.50
dB
25.0
20.0
15.0
10.0
5.0
1.00
1.50
2.00
2.50 msec
mLssa
centre-Plug
50 100
Normal speaker unit
200 500
70
1k
2k
1k
2k
5k
cumulative spectral Decay ieX Frequencies - Hz
sound pressure level from a speaker with centre-Plug compared to
one without, when playing at high play-back level.
conventional speakers don’t fare so well!
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Jamo C 80 page 0ꢂ
Jamo Tech platforms
Motional Feedback (MFB)
Active Impedance Control (AIC)
c 80 sUB features a motional Feedback circuit. When a large woofer has been
abruptly driven by a strong sonic impulse such as an explosion or a timpani,
the woofer continues moving after the impulse stops. The mFB circuit com-
pares the impulse to be reproduced with the actual movement of the woofer.
if the woofer moves unnaturally in relation to the input signal, the mFB circuit
corrects the error before it becomes audible. Furthermore, the mFB makes it
possible to equalize the subwoofer to go deeper without losing any precision.
The result is incredibly accurate, deep bass, full of punch and dynamics.
all c 80 mid/woofers feature active impedance control (aic), an innovative
extension of existing techniques to reduce distortion in electrodynamic loud-
speaker drivers.
The aic makes the impedance more linear in the mid and high frequency
range. aic also increases the sensitivity and total sPL in the upper range of
the driver.
AIC - Active Impedance Control:
Motional Feedback (MFB)
impedance [ohm]
impulse response [V]
30
driver with aic
driver without aic
25
20
15
10
5
0
Time - msec.
Without mFB
With mFB
0
200
500
1k
2k
2k
10k
20k
Frequenzy ]Hz]
Boundary Gain Compensation
The effect of aic is a clearer midrange with a markedly reduced ‘roughness’, es-
pecially noticeable on vocal reproduction. in figures, this amounts to a reduc-
tion of third-order harmonic distortion of around 6dB (ie a 50% reduction).
The Boundary Gain compensation filter in c 80 sUB compensates for the
room influence at low frequencies, as any room amplifies the lowest frequen-
cies. The magnitude of the room’s amplification depends on the room size
and where the sub is positioned in the room – normally it increases the closer
the sub get to a wall. This can result in too high a bass level from approx.
60Hz and increasing downwards – in the range between 20 - 30Hz it peaks
up to 5 - 10dB in an average room!
Harmonic distortion
[dB]
-35
-40
-45
-50
-55
-60
at first this could sound really impressive, but the sound quickly begins to
sound ‘boomy’, especially when listening to music, and rather annoying. so
the Boundary Gain compensation ensures a very linear in-room bass response
and gives you more flexibility when it comes to placement and choosing your
favourite listening position.
driver with aic
driver without aic
Boundary Gain Compensation
-65
sPL/Volts [0.33 oct]
200
500
1k
2k
Frequenzy ]Hz]
When a voice coil is moving in and out of a magnet gap, it changes induc-
tion. When the coil moves inward, the induction increases and vice versa.
This causes the current from the amplifier to be modulated, creating very
audible distortion.
Furthermore the current flowing in the voice coil modulates the magnetiza-
tion of the magnet assembly which also causes distortion of the current.
By using an extra coil, placed inside the voice coil with opposite polarity to
the voice-coil winding, the inductance variation and the flux modulation can
be significantly counteracted.
off
on
10.0
100.0
Frequenzy ]Hz]
compared to the conventional conductive rings in a magnet system aic has
the advantage that it is significantly better at higher frequencies i.e. in the
midrange (on voices) where distortion is most audible to the human ear.
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Model
c 809
c 807
c 805
c 803
c 80 ceN
c 80 sUr
c 80 sUB
c 803 iW
sU6.521K4
Placement FroNT
Placement ceN
•
•
•
•
•
•
•
Placement sUr
•
•
Placement sUB
•
System
3-way bass-reflex
2 x 180 / 7
180 / 7
2½-way bass-reflex
180 / 7
2½-way bass-reflex
155 / 6
2-way bass-reflex
180 / 7
2-way bass-reflex
2 x 155 / 6
2-way dipole
closed
2-way closed
3-way dipole/bipole
165 / 6½
Woofer mm / in
2 x 155 / 6
2 x 254 / 10
180 / 7
Midrange mm / in
Tweeter mm / in
180 / 7
155 / 6
38 / 1½
25 / 1 DTT
200 / 400
89
25 / 1 DTT
180 / 360
89
25 / 1 DTT
160 / 320
88
25 / 1 DTT
125 / 250
87
25 / 1 DTT
160 / 320
88
2 x 25 / 1 DTT
160 / 320
87
25 / 1 DTT
125 / 250
87
25 / 1 Dome
60 / 120
Power W long / short term
Sensitivity dB (2.8V/1m)(2.8V/1m)
Frequency range Hz
Impedance ohm
Rated output W
90
30-24,000
6
35-24,000
6
40-24,000
6
45-24,000
6
70-24,000
6
65-24,000
6
20-200
22k
45-20,000
6
60-22,000
4-8 switchable
1800
Weight kg / lb
33.6 / 74.1
28.3 / 62.4
18.5 / 40.8
9.9 / 21.8
11.6 / 25.6
7.5 / 16.5
25.0 / 55.1
2.8 / 6.2
Dimensions (frame, baffle, cabinet)
1157 x 252 x 428 /
45.6 x 9.9 x 16.9
1007 x 242 x 406 /
39.6 x 9.6 x 16.0
877 x 201 x 347 /
34.5 x 7.9 x 13.7
380 x 225 x 341 /
15.0 x 8.9 x 13.4
212 x 501 x 281 /
8.3 x 8.9 x 13.4
293 x 286 x 181 /
11.5 x 11.3 x 7.1
447 x 390 x 432 /
17.6 x 15.4 x 17.0
400 x 270 x 85 /
342 / 13.5
mm / in (H x W x D)
Dimensions (hole)
15.7 x 10.6 x 3.3
347 x 225 x 110 /
307 x 184 / 12.1 x 7.3
23 / 1400
mm / in (H x W x D)
Back box size
litre / in3
13.7 x 8.9 x 4.3
14 / 854
Optional RIK
riK10.5LW
Black ash,
Black ash,
Black ash,
Black ash,
Black ash,
Black ash,
Black ash,
White (paintable)
Finish
White (paintable)
Dark apple
Dark apple
Dark apple
Dark apple
Dark apple
Dark apple
Dark apple
and Black grill incl.
Danish Sound Design
w w w . j a m o . c o m
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