220-240 Volt versionNOT suitable for North America I bought this, not knowing it was for 220/240 Volt systems. It has a standard North American type plug and 220-240V is in very small print. It did not work right in my system so I replaced all of the old capacitors. Still not right so I took it to a professional technician who discovered the fact that this is designed for 220-240 Volts. So if you are a an audiophile who lives in a country where the mains are 220-240Volts, 50-60Hz, this may be for you. Designed for Allison speakers but also appropriate for virtually any Acoustic Suspension speakers that could use a little bass boost. According to Allison, The equalization curves provided in the ESW are unlike those obtainable from conventional tone controls or general-purpose equalizers. Equalization is carried down to 20 Hz. . . . Only closed-box systems have response that falls off at 12dB per octave below resonance, and so only they are correctly equalized by the ESW. And only closed-box systems maintain control of the woofer at very low frequencies.

This product is an Allison Acoustics dome tweeter with its original mesh cover. The diameter is just shy of 4 Fits various vintage Allison acoustics speakers. Tinsel was repaired at one time however it works great. Reads 4ohms

Allison acoustics filter and bass equalizer. The Electronic Subwoofer. This is used and may show minor wear. Has NOT been tested. The power cord is included as shown.

Nice clean tweeter and has clear undistorted sound

Very rare Allison acoustics AL105 P Loudspeakers exceptional condition, beautiful Oak colour. Beautiful sounding speakers with very little use from the legendary Allison Acoustics factory in USA. Probably the best around on the market at this time. As part of a recent service /refurbishment ( Summer 2022 ) the following work was carried out to bring the speakers up to the highest Allison standards. Driver speakers suspension foam seals renewedNew spiders installed and voice coil magnet seats cleaned and reset to maintain the high standards set by Allison acoustics.New tweeter grills.New carbon steel screws fitted throughout. Just completed 100 hours of running in time, the longer I play them the better they sound. Will be sent by 24 hour fully insured delivery in a secure box with bubble wrap and foam. But before I tell you about Allison I need to explain a little about bass cancellation. A room can be pretty effectively treated for mid and high frequencies because their shorter wavelengths rarely cause unsolvable phase problems but the really big problems are below 500Hz where the bass is. Bass is omnidirectional; it travels in all directions. Not only towards the listener, but also towards rear and side-walls. When this bass bounces off the walls and is reflected back towards the listener, it has travelled a longer distance than the directly radiated bass. In the best case (when the speaker is so close to the wall that the reflected wave is still more or less in step with the original sound) this muffles the sound, destroys timing, makes bass pitch less clear or makes the bass overall just a bit woolly. More often (when the distance to the walls is great enough to delay the reflected sound so much that it is effectively arriving half a wavelength later) it causes cancellation at certain frequencies, which more often than not results in large dips in the mid bass. You can probably imagine what happens if this problem is doubled if both rear and side-walls cause the same problem. At the same time there is the real possibility that one wall causes cancelling while the other wall does the opposite, which is to amplify the bass at certain other frequencies. The end result is a long shot from the wishful thinking that is the flat frequency curve. The theoretically best place for a bass speaker is smack in the corner. This way, all bass, both direct and reflected, is traveling the same distance and is always in phase. This is why we place subwoofers in corners. The bass is amplified acoustically and couples best with the room. Of course you can’t just shove any speaker in the corners of your room because the acoustical amplification will not only keep the bass in phase; it will also hugely colour the sound higher up the frequency spectrum. It works with subwoofers because they are filtered to cut off all frequencies above, say, 100Hz. This is so low that it is mostly below the room resonance and the result will be powerful full bass. Normal speakers also have to portray the midrange and high frequencies. These two are hugely compromised when a speaker is placed near a wall.In come the Allison speakers. They have been designed from the get-go to be placed in corners. Their frequency curve has been tailored just so that they sound neutral when they are placed in the corners of a room. This is not an entirely new idea but these days, in the current loudspeaker assortment, it is unique. Have you ever noticed that the amount of bass differs enormously depending on where you stand in the room? The cool thing about the Allison speakers is that the bass sounds perfect just about anywhere in the room. OverviewThe AL 105 feature room matching, patented Stabilized Radiation Loading, and Convex Diaphragm Dispersion. An acoustically suspended 6.5 woofer keeps the bass lean and tight, while a 1 Mylar dome tweeter provides the crystal clear highs. Highlights6.5 paper cone woofer with foam surround1 Mylar dome tweeterFaux granite baffle finishSealed cabinet constructionThe AL 105 feature room matching, patented Stabilized Radiation Loading, and Convex Diaphragm Dispersion. An acoustically suspended 6.5 woofer keeps the bass lean and tight, while a 1 Mylar dome tweeter provides the crystal clear highs.Specifications:*Power handling: 150 watts max*Impedance: 6 ohms*Frequency response: 78-20,000 Hz*Sensitivity: 90 dB 2.83V/1m*Dimensions: Height 14 3/4 inches or 38cms Width 9 1/2 or 24cms Depth 7 1/2 or 19cms Above dimensions are approximations

Vintage Allison Acoustics The Electronic Subwoofer, audio bandpass filter and bass equalizer. For use with Allison speaker systems. Pre-owned, from a high-end audio studio / collectors estate.

RDL Acoustics F-1 Speakers. Lightly used speakers in excellent condition. Designed by late master builder Roy Allison. Includes original brochure & set up instructions

RDL Acoustics F-1 Speakers. Lightly used speakers in excellent condition. Designed by late master builder Roy Allison. Includes original brochure & set up instructions

RDL Acoustics F-1 Speakers. Lightly used speakers in excellent condition. Designed by late master builder Roy Allison. Includes original brochure & set up instructions

RDL Acoustics F-1 Speakers. Lightly used speakers in excellent condition. Designed by late master builder Roy Allison. Includes original brochure & set up instructions

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.

RDL Acoustics F-1 Speakers. Lightly used speakers in excellent condition. Designed by late master builder Roy Allison. Includes original brochure & set up instructions

RDL Acoustics F-1 Speakers. Lightly used speakers in excellent condition. Designed by late master builder Roy Allison. Includes original brochure & set up instructions

RDL Acoustics F-1 Speakers. Lightly used speakers in excellent condition. Designed by late master builder Roy Allison. Includes original brochure & set up instructions

Offered for your consideration is one (1) Allison Acoustics two-way crossover network removed from an MS200 speaker, U.S.-manufactured c.1990. It was used to divide a 4” mid/bass woofer from a 1” dome tweeter at 2.5kHz and has top quality materials in its construction. This crossover is from the first version MS200; later MS-200 used a smaller tweeter and cost-cutting spring-tab +/- terminals.So, please see my large photos and read the remaining description to decide if this outstanding dividing network is correct for your needs. This Allison crossover is in clean, excellent condition. The black plastic chassis has no cracks, chips, or scratches. It measures 4?” in diameter, extends 2½” into the cabinet, and features heavily wound copper inductors, quality resistors, and a large capacitor. Plus, the sturdy +/- binding post input terminals hold speaker cable very tightly and can also accommodate banana plugs, pins, etc. And, Ive divided the woofer and tweeter wires neatly into pairs for the new owners convenience. Overall, this crossover network is very nicely preserved! Seldom available, this crossover is a great find if you have broken an input terminal, etc. on one of your MS200’s. It’s also ready for action in your next speaker-building project; a center-channel to match your MS200’s comes to mind! As pictured and described, this splendid Allison two-way crossover network is offered at a competitive price. Terms of Sale:I encourage interested parties to ask any questions they may have about this listing before committing to purchase. Payment is due at checkout by PayPal or other accepted methods. U.S. mailing addresses will pay $7.95 for very carefully packed shipping via U.S. Postal Service with tracking and delivery confirmation. International purchases accepted only from those who are able to pay with PayPal, including shipping by U.S. Postal Service First Class Parcel Air Mail. Thanks for looking!

RDL Acoustics F-1 Speakers. Lightly used speakers in excellent condition. Designed by late master builder Roy Allison. Includes original brochure & set up instructions

RDL Acoustics F-1 Speakers. Lightly used speakers in excellent condition. Designed by late master builder Roy Allison. Includes original brochure & set up instructions

RDL Acoustics F-1 Speakers. Lightly used speakers in excellent condition. Designed by late master builder Roy Allison. Includes original brochure & set up instructions

ALLISON MINI 2 Power Guard 6-ohms ALLISON ACOUSTICS Overall all good condition for the age No wires Please see the damages of both speaker Tested and they working but not clear voice Some paints comes off

RDL Acoustics F-1 Speakers. Lightly used speakers in excellent condition. Designed by late master builder Roy Allison. Includes original brochure & set up instructions

RDL Acoustics F-1 Speakers. Lightly used speakers in excellent condition. Designed by late master builder Roy Allison

ALLISON MINI 2 Power Guard 6-ohms ALLISON ACOUSTICS Overall all good condition for the age No wires Please see the damages of both speaker Tested and they working but not clear voice Some paints comes off