VERY RARE VMPS -VERITONE MINIMUM PHASE SPEAKERS - WALNUT - PRE 1998 - (Spring Hill, FL) $450.00
http://tampa.craigslist.org/hdo/ele/5350668532.htmlhttp://www.ebay.com/itm/VERY-RARE-VMPS-VERITONE-MINMUM-PHASE-SPEAKERS-WALNUT-pre-1998-/221963311393?_trksid=p2141725.m3641.l6368
"VMPS Loudspeakers
Hello you're looking at a set of Very Rare vintage VMPS ( Veritone Minimum Phase Speakers ) Speakers . VMPS was a division of Itone Audio , in El Sobrante California. VMPS was a basically a 1 man show ( Brian Cheney ) speaker company that lasted from 1977 to 2012 when Brian passed away . More information is below ,
They roughly measure 8 3/4 inches deep X 18 inches tall X 12 inches wide each
They seem to be from before 1998 since there is no ribbon tweeter.
Woofer surrounds have been replaced
NO STANDS ARE INCLUDED IN THIS SALE
Specifications :
VMPS 2 WAY Bookshelf Speakers
Woofer: 8 inch
Tweeter: 1 inch SOFT DOME w/adjustable gain
Cabinets: Walnut over MDF
Size: 18" x 12" x 8 3/4"-PORTED
Condition:
Cabinets: 8-8 1/2
Sound: 10+
Level Controls
On the rear of speaker cabinet, VMPS speakers included level controls to attenuate the sound level of the mid-range and treble (tweeter). These level controls were intended to be used in concert with PR mass tuning to achieve the desired overall tonal balance.
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*All items are in used condition with normal signs of wear unless other conditions are specifically mentioned in the description. If clarification is needed, don't hesitate to contact us.
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VMPS History, discussed in this Ad.VMPS (Veritone Minimum Phase Speakers) delivered its first production run to dealers in January 1977. Since it started out, hundreds of competitors have come and gone. VMPS survived 35 years because it not only provided a good product at a good price, but give the audiophile something rare in today's marketplace: fullrange, floorstanding speaker systems with first-octave bass response, wide dynamic range, high sensitivity, and a neutral tonal balance suited to any kind of music (or home theater, for that matter) at prices that are a fraction those of other name brands.
It was Bert Whyte, late Senior Editor of Audio Magazine, whose April 1980 review ("Towers of Power") of the 198cm, 113kg VMPS Super Tower IIa/R put VMPS on the map, validating a unique design philosophy which emphasized full spectrum reproduction at intentionally, often spectacularly low prices. The STIIa/R, with its 16 active drivers including four of the most expensive tweeter extant, the Focal T120 harddome, retailed back then for a very affordable $3,876/pr.
VMPS aspired to the highest levels of transducer technology, sound quality, ruggedness, and cabinetry and are undaunted when it comes to spending the money necessary to achieve those high levels. Speakers were not priced to mislead the consumer, who naturally assumes price and quality are related. No automobile selling at Ferrari prices would dare offer VW performance, but that is precisely what is happening in many instances with audiophile speaker systems. Brian Cheney found such pricing practices a shame and a scandal, the cause of endless confusion and grief for music lovers who want the best but do not have six figures to invest in sound equipment.
The VMPS program included Subwoofers, all passive (i.e. no builtin amplifier), all quite substantial size and weight (the "Dedicated" Sub is the baby at 38kg), all requiring no equalization to pump out bass in the teens and twenties, and all easy to add to any system via the existing main amplifier and our optional Passive Crossovers, or via the biamp route with an outboard Electronic or Passive Crossover and a separate drive amplifier. Typically, the distortion of VMPS Subs is an order of magnitude lower than the competition. VMPS invented the slot-loaded passive radiator in 1979. It remained a feature in all VMPS Subs and Towers, a push-pull, high efficiency means of generating first octave bass with high input sensitivity.
VMPS was proud of its great reputation for solid, clean, extended bass in nearly every speaker it made. However, there is more to good speakers than just bass, although bass is the foundation of all music and a third of the keyboard lies in the bass range.
Year 1998 saw two new drivers arrive from VMPS that have never existed heretofore. The 190cm tall push- pull, transformerless, unobstructed, high impedance (6 Ohms), high output 100Hz ribbon panels in the acclaimed Special Ribbon Edition Super Tower III (see Anthony Cordesman's review in Audio Magazine Aug 98; the reviewer also purchased the system for his home) are nothing short of a new "Absolute State of the Art" (Audio). Matched up with the unique synthetic granite, quadruple 30cm woofer towers and 15cm free- swinging ribbon supertweeter, the SRE/ST3 is the best speaker you can buy at any price. This is no mere repackaging of a few hundred dollars worth of cones and domes costing megabucks: our system includes the speakers, outboard electronic crossover and massive associated power supply (one million microfarads!).
Veritone Minimum Phase Speakers
From Wikipedia, the free encyclopedia
VMPS
VMPS Company Logo.jpg
Founded January, 1977
Defunct December, 2012
Headquarters VMPS was based in El Sobrante, California
Key people
Brian Cheney, founder
Products Loudspeakers
Website vmpsaudio.com
Veritone Minimum Phase Speakers, or VMPS, was a loudspeaker manufacture founded in 1977 by speaker designer Brian Cheney. Many VMPS speakers received favorable reviews from audio critics, such as the RM40, which was awarded Best of CES in the High-End Audio category in 2002.[1] VMPS was in operation for over 35 years, from January 1977 to December 2012, when it closed soon after the death of company owner Brian Cheney on December 7, 2012.[2]Design[edit]
The VMPS speakers employed phase coherent drivers (for best stereo imaging) by employing first-order "minimum phase"[3] filters and drivers wired electrically in-phase.[4] Such first-order filter designs typically do not provide adequate low-frequency attenuation for mid-range and tweeters. Speaker designer Brian Cheney viewed high-order filters as undesirable since they were not "minimum phase", meaning their phase response was not flat with frequency. He also avoided high-order filters because he believed they often required drivers be wired electrically out-of-phase and, in his opinion, had inferior stereo imaging.
Brian also believed direct measurements should not play a significant role in the design process or evaluation of a loudspeaker. Instead, speakers should be designed and evaluated based on how they sounded. In this sense, VMPS speakers did not follow a conventional design philosophy which strived for a "flat" frequency response within a set tolerance, e.g. ±2.5 dB. In Brian's belief, most listeners could tolerate moderate fluctuations in frequency response. Furthermore, such measurements performed in the laboratory (anechoic chamber) were a poor representation of the customer's listening environment, meaning a speaker that "measured flat" in the laboratory would likely never measure flat in the customer's home. Thus, he felt that flat frequency response was both unnecessary and practically impossible to achieve, unlike the vast majority of other speaker designers throughout audio history.
Brian approached speaker design like a musician, using his ear for primary feedback. Minimum phase filters and drivers wired in-phase were used because they sounded the best. This philosophy was directly expressed in the name of his company: Veritone Minimum Phase Speakers, which taken literally means: variable tone (or frequency) minimum phase distortion speakers (drivers wired in-phase with linear phase response). The choice of term "tone" (musician's terminology) over the term "frequency" (scientist's terminology) also may have expressed his belief that the musical characteristic of the speaker was more important than scientific measurement.
The most recent VMPS speakers were a three-way design that featured ribbon drivers for the mid-range and tweeter. The high bandwidth of the mid-range "Neopanel" complemented the use of first-order filters. Woofers were used for bass and mid-bass, along with a passive radiator or port for the 626 bookshelf model. The "RM" in the speaker name (e.g. RM40) stood for "Ribbon Monitor". The RM40, RM/X, 626, RM30, RM-V60, and RM-50, all used a "Neopanel" mid-range, and a modified Aurum Cantus ribbon tweeter, except for the RM50, which used a Hi-Vi ribbon tweeter. Woofers had woven carbon fiber cones and phase-plugs. The VMPS bass management system used one or more high-compliance down-firing passive radiators that was tunable by adding or removing putty from the diaphragm.
Passive radiator mass tuning, along with level controls for mid-range and treble on the rear of the speaker, allowed the listen to tune the sound of the speaker to their listening room and personal preference. Tuning of VMPS speakers was time consuming to achieve optimal sound and required some experience. Brian Cheney would frequently visit a customer's home, often at his own expense, to optimize the sound of the speaker system in the listening environment.
Neopanel[edit]
The mid-range "Neopanel" is 2.5" x 7" planar diaphragm (ribbon) using a push-pull motor with neodymium magnets. The Neopanel in the VMPS speakers is used with a first-order filter between 220 Hz and 7 kHz. The Neoplanel was originally designed by Bruce Thigpen.[5] This design was licensed to Level 9 and manufactured in Canada and later China and sold as Monsoon computer speakers[6] with a subwoofer. Brian Cheney stated he modified these panels to fix a mechanical flaw that made them unreliable.[7]
Constant Directivity Wave Guide[edit]
Brian Cheney invented and patented[8] a Constant Directivity Wave Guide (CDWG) to increase the horizontal dispersion of the planar mid-range and tweeter. The first generation CDWG was attached like a speaker grill to the RM30 and RM40 speakers. The CDWG consisted of an aperture (slit) with sound absorbing foam between the CDWG grill and front baffle. A second generation CDWG placed the CDWG aperture directly on the face of the Neopanel and ribbon tweeter.
Bass Management System
Most VMPS speakers incorporated one or more passive radiators (PR). To achieve optimal sound quality, the set-up process required the listener change the mass of the PR by adding or removing Mortite putty from the cone. This process changed the resonant frequency and "Q" of the PR and dramatically affected the sound of the bass. This allowed the listener to change the overall tonal characteristic of the bass and to compensate for the bass response of the particular listening environment.
VMPS's passive radiators used a unique high-compliance suspension and a low moving mass diaphragm to achieve a low resonant frequency. The low moving mass reduced the gravity sag of the PR cone and allowed it to be mounted on the bottom of the speaker cabinet and fire downward in a loaded slot. The slot acted as a low-pass filter to remove unwanted high-frequency sound generated by the PR cone. The low mass of the PR also meant it was very sensitive to small changes to the amount of putty (mass) on the cone.
