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ALLISON Acoustics CD 7 Room-Matched Walnut Speakers (pair) Completely Refurbished - Beautiful and Wonderful Sounding - New Internal Components NEW Old Stock EMINENCE 8 WoofersNEW MPT Film Audio CapacitorsOriginal Convex Diaphragm Tweeters Checked and TestedWalnut Cabinets Refinished and OiledWe even made special stronger grills with cloth under the metal mesh to help keep the woofer dust free (as seen in the last 2 photos). Both the original grills and these custom grills are included.The result is a beautiful pair of small tower type speakers. The sound is wonderful, the upward facing woofers are strong, deep and responsive with the speakers placed against the wall as designed (typically where we need to place the speaker but seldom recommended for most speakers). Several compliments have been made in our showroom concerning the stage presence and 3D sonic characteristics. Nice, smooth and musical. 27 tall x 9.625 x 9.625 and weighing 22lbs each We feel comfortable packing and shipping these in two separate boxes.Please refer to our feedback to see our success selling and shipping valuable audio equipment. Below is an Overview and a HiFi Classic review of the Allison CD7 Speakers: Overview:Allison’s CD line of Room-Matched speakers is built on the strong foundation of the Designer Series. Sculptural art in cabinet styling, and state-of-the-art acoustic technology, are combined to produce speakers with extraordinary visual effect and a new, higher level of musical accuracy. It is clear that loudspeaker cabinets, which occupy prominent positions in living spaces, should be as pleasing to the eye as we can make them. But loudspeakers are more than furniture, and technical performance is of overriding importance. Our primary performance criteria are:Uniform(flat) acoustic power output.High output capability, enabling the system to reproduce the full dynamic range of digital and analog recordings.The lowest possible distortion at all output levels..Very broad dispersion at all frequencies.Maximum reliability, gained through sophisticated .engineering and rigid quality control.Convenience and flexibility in placement.Convex DiaphragmsA very important factor in our ability to achieve high accuracy is the unique operating principle of our mid-range driver and tweeter, which function effectively as pulsating hemispheres. Our Convex-Diaphragm tweeter has dispersion more uniform at the highest frequencies than that of any other tweeter made. This is important because it provides flat treble power output, which yields accurate spectral balance and timbre. It also produces sound imaging over a large listening area and gives a realistic simulation of the original space around the image. The CD series of Allison loudspeakers has refinements in high frequency performance now available for the first time. Tweeter distortion, already very low, has been further reduced.Power response in the tweeter crossover region has been made even smoother.Power handling capability has been increased without compromise in any other aspect of performance. HiFi Classic Review:Some years ago, Roy Allison conducted a study that indicated that the room in which a speaker is placed, and the physical relationship of the speaker and the room, can produce a significant change in the actual acoustic low-frequency power response of the system. This is in addition to the normal standing-wave and room-resonance phenomena that usually cause variations in the low-frequency sound-pressure level throughout a room. The undesired interaction between room and speaker can be minimized by designing the speaker to operate together with the room as a system. From the beginning, therefore, Allison loudspeaker systems have featured what Allison Acoustics calls “Room-Matched” design. The low-frequency power output of a speaker can be optimized for mounting against one, two, or three room-boundary surfaces (walls, floor, or ceiling). All Allison speakers have been designed to take advantage of this fact, although the various models differ considerably in their physical configuration and in their recommended placement. The new Allison:Seven is a relatively low-cost, floor-standing, two-way speaker designed to be placed against a wall but at least 2 feet from a corner. Because of their broad dispersion, a pair of Allison:Seven speakers need not be placed against the same wall and will operate effectively when facing at right angles to each other. The oak-veneer cabinet is 27-1/2 inches high and 9-5/8 inches square, and each speaker weighs 22 pounds. The 8-inch woofer of the Allison:Seven faces upward, and in the recommended placement its edge is within an inch of the wall. (This is necessary to avoid the partial cancellation of mid-bass output that occurs whenever a woofer is located a foot or so from a wall.) The woofer operates in a sealed (acoustic-suspension) enclosure with a volume of 1,775 cubic inches, and it resonates at 52 Hz. It crosses over to the tweeter at 2,000 Hz, with 6-dB-per-octave slopes. The speaker has no level or balance controls. The forward-facing tweeter is located near the top of the front surface of the cabinet. Its voice coil is cooled and damped by Ferrofluid, and the tweeter has the patented Allison convex diaphragm, which gives excellent dispersion by virtue of being designed to simulate a pulsating hemisphere. The diaphragm is not hemispherical in shape, however. It resembles a rounded cone reminiscent of a giant spherical phono stylus. The low-frequency response of the Allison:Seven is specified as — 3 dB at 41 Hz and —6 dB at 34.5 Hz. The system impedance is rated at 4 ohms, and its sensitivity is specified as 87 dB at 1 meter for a 1-watt input. The Allison:Seven is sold in pairs, and the price is $450 per pair. Comment...Over the years, we have tested most of the Allison speakers as they have appeared, and we have found them, despite their wide differences in size and price, to be uniformly excellent and generally very similar in their sound properties. The Allison:Seven is in that tradition. In our listening room we were unable to place the speakers directly against the wall behind them because of baseboard heating fins and other obstacles. Much of the time, the speakers were about one foot from the wall. If this had any adverse effect on their performance, we were unaware of it. The sound was smooth, balanced, and without any apparent emphasis or de-emphasis of any part of the audio spectrum. The dispersion of the speakers was excellent, and there was no sense of spatial separation between the sounds from the woofer and tweeter. The Allison:Seven is a compact speaker, and its walnut finish is attractive. When given the opportunity, the system delivers an impressive level of clean, deep bass that seems almost inconsistent with its dimensions and light appearance. Considering that we did not have the speakers placed optimally for flat bass output, their performance is all the more impressive. Priced competitively with a number of good but conventional “bookshelf’ speakers, the Allison:Seven offers definite advantages over many of them in both audible and visible terms. It is an excellent value, and the only possible disadvantage we can see for it is the requirement of a closely backing wall for theoretically optimum results. Allison claims, however, that no matter where the speaker is placed, its bass response will always be at least as good as a conventional speaker in the same location, and this seems to have been confirmed in our tests. Smooth, well-balanced sound, compact, and relatively inexpensive—a nice combination.
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