Model 2. W Series Subwoofers . The 2. Wq receives its input from the power amplifier and is designed to maintain maximum sonic continuity between the subwoofers and main speakers in all music and home theater systems where a crossover can be inserted between the preamplifier/processor and the main power amplifier. The V2. W accepts line- level inputs exclusively and is designed for home theater systems with integrated processor/amplifier units where the bass is handled by a line- level subwoofer channel. The 2. W subwoofer series is compatible with a wide range of main speakers from Vandersteen and other manufactures.
Large main speakers with accurate frequency and phase response extending at least an octave below the crossover point will provide optimum blending and linearity through the crossover region. Even subwoofers rarely excel at all three, their designers choosing to compromise one in exchange for proficiency at another. Vandersteen Audio refused to compromise. The original Model 2.
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W spent five years in the prototype stage being tested, evaluated, measured and revised before its introduction in 1. Equal exhaustive attention was paid to the technology of the 2. Wq and V2. W. Vandersteen 2. W series subwoofers use three active eight- inch drivers rather than a single large woofer. The three eight inch drivers equal the cone area of a fourteen- inch woofer, but with much higher motor- to- cone- area ratio. The high ratio improves pitch definition and insures stable frequency and phase responses throughout and beyond the drivers ’ operating range. This allows more crossover design flexibility since a steep- slope, high- order crossover is not necessary when the drivers perform well several octaves past the crossover frequency.
The drivers are downward firing in a front slot- loaded configuration to provide superb bass detail, impact and dynamics while minimizing any potential midrange interference. Each of the drivers uses a heavy duty 1 1/2 inch, four- layer voice coil engineered to withstand high temperatures. Each voice coil is within a massive 4. Critically damped, long fiber cones with environmentally stable butyl rubber surrounds are used for excellent rigidity and linearity. The drivers are connected to a built- in 3.
This powerful amplifier provides the benefits of bi- amplification to the system without the additional expense and complexity of an additional separate amplifier. The cabinets of the 2. W series subwoofers are constructed of MDF (Medium Density.
Fiberboard), a wood product far more dense and acoustically inert than particle board. FFT analysis and listening tests refined both the shape of the enclosure and the placement of the internal braces. The entire structure is carefully designed to minimize cabinet resonances that could affect the system ’s performance. Feed- Forward Error Correction. Many subwoofers use a negative feedback or servo control type of error correction that samples the output of the subwoofer amplifier or the movement of the driver and makes comparisons to the original input. When a deviation is detected, a correction signal is generated to counter the error.
A shortcoming of these systems is that an error must actually occur before the correction process can begin. The negative feedback and the non- linearities of the correction create their own audible distortions that compromise the performance of the subwoofer. The 2. W series uses Feed- Forward Error Correction (FFEC), which eliminates the errors before they begin. Extensive spectrum, FFT and dynamic analysis of the 2. W detected the errors that would occur during normal use. The inverse of these errors was then designed into the integral amplifier to eliminate the errors before they could occur.
Errors resulting from coupling, loading, driver phase and frequency non- linearities and thermodynamic box loss are eliminated by FFEC. The 2. Wq’s Unique Adjustable QIn Subwoofer engineering terms, system Q is the product of a complex mathematical equation derived from driver, electrical and enclosure parameters. In practical terms, it relates to the character of the bass response. A low Q subwoofer sounds highly damped and very tight. A high Q subwoofer produces a warm loose bass with more energy in the most audible bass range. The trick has always been to try to find the subwoofer with the Q that best matched your listening room and personal tastes.
The 2. Wq is the first subwoofer to feature adjustable Q. A bass contour control on the rear panel allows you to set the system Q anywhere from . Slightly overdamped, i. Significantly underdamped, i. Somewhere in this wide range, you will find the perfect sonic complement for your room and taste.
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Conventional powered subwoofers receive their input signal directly from their crossover before the main amplifier. The sonic signature of the main amplifier that is an important part of the sound you hear from the full- range speakers is missing from the subwoofer.
This causes blending and integration problems as the sonic characteristics of the system are different above and below the subwoofer crossover point. This deterioration of system coherence is why conventional subwoofers have never been totally accepted as part of ultra high- performance audio systems. The 2. Wq uses a unique, innovative connection method that reduces the current demands on the main amplifier, but leaves the main amplifier in the signal path to the subwoofer. The system realizes the benefits of bi- amplification with absolute sonic continuity as the main amplifier ’s characteristics that are evident through the full- range speakers are maintained to the deepest bass, but with the power and control of the 2. Wq ’s internal 3. The crossover of the 2. Wq is divided into separate low- pass and high- pass sections.
Like conventional subwoofers, the high- pass portion of the 2. Wq ’s crossover is inserted into the signal path just before the main power amplifier to roll- off the low- frequency response of the main amplifier and speakers. The critical difference is that the 2. Wq does not take its input from its crossover, but samples the output from the main amplifier that is driving the main speakers. To compensate for the low- frequency roll- off induced by the crossover, the response of the 2. Wq’s amplifier is contoured to restore the low frequencies to the proper level.
The 2. Wq ’s input impedance is high enough that it has no effect on the output of the main amplifier. Since the high- pass portion of the crossover is inserted between the preamplifier and power amplifier, you must be able to separate the preamplifier and power amplifier sections of a receiver or integrated amp for it to be compatible with the 2. Wq. In all systems, the input impedance of the main amplifier must be known in order to properly set the 2. Wq ’s high- pass crossover. The low pass crossover is integrated with the 2. Wq ’s amplifier and does not require adjustment. Both sections of the crossover are transient perfect, 6d.
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B per octave designs. A variable single- ended crossover is included with each 2. Wq subwoofer. Optional fixed value crossovers are available both in single- ended and balanced configurations to match any main amplifier.
The output level of the 2. Wq can be adjusted to match speakers with an efficiency rating of between 8. B and 1. 00d. B. Wires and banana plugs to connect the output of your full- range amplifier to the input of the 2. Wq are included with each subwoofer. Mono or Stereo Bass. There are significant advantages to using two subwoofers. Modern sources such as CDs, DVDs, digital high- resolution music files, and Blu- ray Discs maintain full stereo separation to below 2.
Hz. Summing the channels into a single subwoofer reduces or cancels all the low- frequency information containing phase differences between the channels. Stereo subwoofers reproduce all of the bass information complete with the phase differences that help provide the imaging and location cues we use to place people and things at distinct points in the sound field. Stereo subwoofers alsoimprove linearity on mono as well as stereo sources by coupling the bass to the room at two points and lend themselves to natural placement near the corners where low frequency room gain is often desirable. Ultimate Multi- Channel.
A pair of 2. Wq subwoofers is the premier configuration for high- quality multi- channel home theater systems where the surround- sound processor can be programmed to redirect the LFE (Low Frequency Effects) information to the main speakers. In addition to the benefits of stereo bass, disabling the surround processor’s LFE output often improves the system ’s midrange clarity and articulation. For the ultimate system, additional 2.
Wq ’s can be added to the surround channels.