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D 7SUR
The dipolar surround speaker D 7SUR, use the same
drivers as the D 7LCR.
This is done to achieve seamless timbre matching with
D 7LCR and to obtain the same high level of detail in
the sound reproduction.
D 7SUR is equipped with one 5½" woofer, four 2½"
midrange drivers and two 1" tweeters. At both ends of
the speaker, there is a midrange/tweeter array with
two midrange drivers, mounted close to each other
D 7SUR
with the tweeter above them - all in a vertical line.
This is done because the surround speakers, due to their positioning in relation to the
listening position, must have a different dispersion characteristic than the front speakers.
The dispersion pattern must be to the sides and upwards to "paint" the walls and ceiling
with sound.
The D 7SUR features a single woofer mounted in the centre of the front baffle.
This configuration was chosen as conventional dipole speakers often suffer from poor bass
reproduction, due to phase cancellation between the two woofers.
When equipped with one woofer, the depth of the cabinet can also be minimized, further
adding to the ease of installation in the room.
The crossover frequency for the woofer is set at 200Hz, making it impossible to locate the
speaker placement.
With this configuration we have a dipole surround speaker with the "best of two worlds": It
is capable of reproducing the deepest bass - and still able to disappear physically in the
sound picture.
D 7SUB
The D 7SUB is equipped with a very powerful 15"
woofer. It is controlled by our Motional feed back
(MFB) circuitry and equipped with a solid 400 watt
(continuous output) class D amplifier, capable of
delivering peak power of up to 700 watt.
The stand by power consumption is <1 watt.
Thanks to the heavy MDF board cabinet, the powerful
amplifier, and the MFB circuitry, the D 7SUB delivers a
deep, precise and detailed reproduction of the low
register - perfectly matching the sound from D 7LCR.
D 7SUB
D 7SUB visually matches D 7LCR as width and design are identical.
A change in THX Ultra2 compared with THX Ultra is the frequency range. In THX Ultra2
the subwoofer is required to operate down to 20 Hz -6dB, compared to 35 Hz -3dB.
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