The NBS Reference Monitor
LoudSpeaker Systems are an original design by Walter Fields, the designer
of NBS Audio Cables.
SIREN AND THE ONE
SIREN AND THE SARCOPHAGUS
In addition, the system should look good, be very reliable and be built to last.
Having identified and described these critical items, we must conceptualize a design which will address them.
The configuration of the Pyramid is unusual in that when viewed from the front, no openings or speakers are apparent. The woofer faces the floor, the midrange apertures are on the sides and the tweeter is in back. All the sound reaches the listener by indirect paths. Because of this, the room reflections are properly excited by the speakers and are, in fact, required to produce the proper imaging.
The important aspect of this philosophy is that no reasonable room needs to be tampered with in order to achieve good results. Many speakers have such colored off-axis response that it is necessary to "kill" the room reflections through acoustic treatment. This treats the symptom, not the disease. The problem is with the speaker, not the room. If the room has been "killed" it will be necessary to "un-kill" it for an indirect radiating speaker such as the Pyramid. When this is done, the result will be superior imaging over a very wide area. So now you can live in the room and have music too.
As mentioned above, the driver selection is critical. In all the NBS loudspeaker models, all the drivers are manufactured by the Professional Products Division of JBL. In the Pyramid, the three transducers are possibly the best of their respective kinds in the world. It follows that they are not inexpensive. The driver cost alone in the Pyramids exceeds the entire cost of goods for many $20,000+ speaker systems.
The woofer is a JBL 2235H, 15" unit in a sealed enclosure. Sealed systems invariably have better bass articulation than vented, or bass-reflex systems. By placing the driver close to the floor, the reflection dip which impairs the mid-bass performance of many systems is completely avoided. In our experience this is the most musically satisfying woofer we have ever heard. Because it is used near the reflecting plane of the floor, it has a practical sensitivity of 96 dB/Watt, which sets the sensitivity for the whole system.
The midrange is a JBL 2490H compression driver loaded in a 25" horn structure with conic expansion in a ratio of 2:1. This stupendous driver applied in this way has a raw sensitivity of over 105 dB SPL/Watt.
The tweeter is a JBL 2402H ring radiator. This is the modern version of one of the most classic horn tweeter designs. The horn is circular and there is no explicit diaphragm. The throat of the horn is driven by the edge of the voice coil. The response is very extended and the sensitivity is 110 dB SPL/W.
All these drivers have extraordinarily powerful motors. In the midrange and tweeter, exotic materials and designs give the lowest possible moving mass, hence very high acceleration (as discussed earlier).
The crossover uses the simplest topology that will do the job. The components are of the highest quality and comprise litz-wound air-core inductors and film-dielectric capacitors.
The cabinet shape of the pyramid ensures that diffractions around the cabinet are smoothly distributed in frequency. In all models the construction is of 1" thick material throughout and extensively braced (these are powerful systems).
SPECIFICATIONS & PRICING
E. V. A. AND BUTTER/FLY SPEAKER SYSTEMS
E V A & BUTTER/FLY
THE TWO PYRAMIDS HOUSE ONE 18" WOOFER PER UNIT
THE BASS UNITS FOLLOW THE COUTURE OF THE BUTTER/FLY AND HOUSES ONE 18" WOOFER PER UNIT
THE EVA & BUTTER/FLY HOUSE TWO MID-RANGE COMPRESSION DRIVERS AND TWO RING RADIATOR COMPRESSION TWEETERS AT THE EXTREME LEFT AND RIGHT
THE TOTAL ARE SIX DRIVERS IN PHASE ALIGNMENT
EFFICIENCY: 96db 1 watt at 1 meter
MINIMUM RECOMMENDED AMPLIFIER POWER 75 watts
That's all you need to know. Your ears will tell you the rest. Happy listening!
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