The Interface D
combines the best qualities of the finest speakers in the world without their
weaknesses. The result is a new standard of accuracy, efficiency and overall
performance.
There are speakers
with exceptional midrange definition. And speakers with deep bass or
exceptional stereo imaging.
Really of 28 Hz
The Interface D's
bass response is virtually unprecedented. Its 3-dB-down point is 28 Hz. And
unlike some speakers which have limited output at low frequencies, the
Interface D can produce an incredible 106 dB long-term sound pressure level at
28 Hz.
The bass is also
smooth. This is due in large part to placing the 12" woofer in a
downward-firing position. This couples it to the floor and wall which smooths
the response, by eliminating boundary effects caused by front mounting, and
efficiency is increased by 3 dB.
A new kind of
midrange
The efficiency and
high output ability of the woofer made almost impossible demands of the
midrange. In fact, it would have been impossible to design a midrange driver of
reasonable size, high efficiency, high output and low crossover point using
conventional speaker technology. So we designed our midrange using the same
optimally vented technology we pioneered for woofers.
This
optimally vented midrange uses
exactly the same 16-pound magnetic structure as the woofer. So it can deliver
long term sound pressure levels of up to 115 dB and peaks up to 125 dB. At the
same time, it's small 6-1/2"
cone provides excellent dispersion over its entire frequency range.
Without vented
technology, a small cone couldn't produce high sound pressure levels at low
frequencies - it just couldn't move enough air. But the self-contained, vented
enclosure solves that problem. The enclosure and vent size are critically
selected so at low frequencies, a small movement of the cone produces a large
movement of the air in the vent. Over the lowest itself provides most of the
system's output.
The exceptionally
low crossover (350 Hz) made possible by the optimally vented midrange has an
important audible result. There is no crossover in the most critical part of
the vocal range. At last you'll hear an almost unbelievable clarity and
definition. It's the "sweetness" many audiophiles associate with
electrostatic speakers, but without their inherent weaknesses.
The tweeter without
"horn sound"
This tweeter has
natural, accurate sound and has significant advantages over conventional cone
and dome drivers.
It is 10 dB more
efficient than any cone or dome could possibly be. And it can play louder than
conventional tweeters. This additional output is extremely important in
contemporary music. At realistic volume, synthesizers and closemiked brass or
percussion make severe demands of a tweeter. Thanks to its horn tweeter, the
Interface D reproduces that kind of music accurately.
The third advantage
of our horn tweeter is equally important-unusually uniform and well-controlled
horizontal dispersion over its entire frequency range. The dispersion of all
cone and dome drivers varies with frequency. At low frequencies, dispersion often
exceeds 180 degree which causes severe diffraction from the edges of the
cabinet. This result in cancellation effects and less uniform total acoustic
power output. But a higher frequencies, conventional tweeters have much
narrover dispersion. These constantly changing dispersion angles result in a
vague, blurred stereo image.
But the Interface
D's dispersion is tightly controlled by the 120 degree angle of the horn. Even at low treble frequencies, dispersion
remains well under 180 degree, eliminating diffraction effects. And even above
16,000 Hz dispersion is better than 110 degree.
Specifications
Frequency
Response: 23 - 20,000 Hz ±3 dB, 28 -
18,000 Hz , 1 m on axis
Total Acoustic Power
Output: ±3 dB, 28 - 18,000 Hz
Horizontal
Dispersion:
Angle 170° ±5° in
the 500 - 1000 Hz octave bands
Angle 115° ±10° in
the 2000 - 16,000 Hz bands
Anglw 110° in the
16,000 Hz band
Recommended
Amplifier Power: 1,5 watts per channel
minimum; 500 watts max
Sound Pressure
Level: 97 dB at 1W/1m
Midband Sound
Pressure Level (in a Typical Listening Room):
90 dB average, 100
dB peak with a 1,5 watt amplifier;
115 dB average, 125
dB peak (10 ms) with a 500 watt amplifier.
Maximum High
Frequency Sound Pressure Level( In a typical Listening Room): 103 dB long-term average (10,000 Hz)
Midband Power
Capacity: 50 watt long-term average; 500
watts peak (10 ms)
Crossover
Frequencies: 40 Hz acoustic, 350, 3000
Hz electrical (may be bi-amplified at 350 Hz)
Transducers:
12"
downward-firing woofer
6-1/2" vented midrange
Radial horn tweeter
Impedance: 8 Ω nominal; 5 Ω minimum
Controls: Environment slope (0 dB, -3 dB, -6 dB, -9 dB
at 10,000 Hz)
Dimensions (H x W x
D): 32" x 21-3/4" x
15-1/2"
Weight: 114 lbs
Cabinet: Walnut veneer
