For sale is a pair of Mosaic Acoustics Illumination reference loud speakers. These are the latest creation of Dale Pitcher and are the result of many years of research. These are end of the road speakers and are capable of creating a listening experience that very, very few speakers are capable of. I heard these at Axpona a couple of years ago and absolutely loved them. I asked how they would work in my room and was told that my room may be too small (12 x 15.5 x 8). As is the case with all of Dale's speakers that I have heard, these have a very wide and even dispersion. They image and stage as well as any speaker I have ever heard, period. They produce very fast and articulate bass. They have electrostatic like speed and resolution in the mids and highs. I know that comment gets used quite a bit, but with these, it is absolutely true. I found them to require a subwoofer to reproduce the lowest octave. This pair came up for sale and I had to give them a try. Turns out that I can get a fair portion of what these are capable of, but my room is indeed too small to get the most out of them. I had to give it a try, but regretfully, they are for sale as I am not getting a bigger room any time soon. There are a couple of cosmetic issues to point out. First, one of the pedestals has had a repair done to the granite wrap on it. I tried to take a picture of it, but it is hard to see. It is there none the less. Second, on the top of both woofer cabinets are black anodized aluminum plates that the tweeters sit on that are mechanically isolated from the vibration of the woofer cabinets. There are scratches thru the black from the front point that the tweeter housing rests on. These are not visible when the speakers are set up. Third, the pedestals have some scratches on top from positioning the woofer cabinets on top. It is a difficult task to set the woofers on the pedestal and must be done with the points installed. The woofer cabinets are about 150 pounds each. These are not visible when the speakers are set up either. I am rating these as 6 of 10 due to these issues. I have added pictures that show the top of the bass cabinets and the speaker pedestals. None of these will be visible when the speaker is set up. I have all of the original packaging for these. Also included are the reference external crossovers, a total of 8 point for between the woofers and pedestals, a total of 14 Herbie's Audio Lab threaded stud gliders for below the pedestals and crossovers (I have no idea how you would move these if you did not have something like this. It would be impossible with points in those positions). I also have the quartz aggregate used for mass loading of the tweeter housing, the single point for each tweeter housing, and the felt for between tweeter housing and woofer cabinet. These are reference transducers that are very particular about room set up and tweeter positioning and require high quality matching components. The factory packaging is of very high quality, but these speakers must be shipped by freight with a lift gate truck. I am asking $4400 plus shipping for these. Contact me with any question and thanks for looking. Below are some of the design features and considerations of these outstanding speakers.
The Mosaic Acoustics Illumination is a floor-standing, two-way loudspeaker of 46” Height, weighing in at 240 pounds per side. The Illumination has an efficiency of 92.6 dB. Frequency response of 55kHz to 35Hz. It is comprised of five individual components:
1) The Pedestal: The Illumination rests on an internally-cast platform assembly with 5 – 1” diameter Brass thru-assemblies. Interfaced internally with each of these shafts are mechanical loads for the termination of vibrational energy. A pocket at the rear of the pedestal allows for the inset of the external filter housing below the speaker. The 30 pounds of reactive-mass on the interior the pedestal provides for bass isolation from the floor and considerable energy projection into the listening environment.
2) The External Filter Assembly: The Filter topology of the Illumination is a 1st order Butterworth. The external housing is cast in Quartz aggregate and contains the 3 terminal blocks and the electrical componentry. It is set on 3 Brass feet. The capacitor is a proprietary design assembled by Mosaic Acoustics. The non-conventional topology allows for extremely fast and symmetrical rise and settling times without the overhang of internal electrical energy storage.
3) The Bass Housing: The Bass Housing is cast from a mineral filled “plasticized” cement. The casting defines the acoustical paths. The acoustical load is an integrated hybrid design: Laminar-Flow Transmission Line, Exponential Horn and Aperiodic topologies are used in both parallel and series configurations throughout the acoustical load. More about this singular acoustic load topology is found in the “Design Overview section”. All internal damping is with long hair wool and acoustical wool felt. Exterior wall construction is a seven layer constrained-layer damping configuration, culminating in .5” thick granite on the exterior surface.
4) The Vibration Isolation Platform: This provides for two primary functions – isolation of the tweeter housing from modulated bass cabinet vibrations (isolated silent mechanical ground) and a mechanical load termination to dissipate any vibration from the tweeter housing (exclusion of Doppler issues).
5) The Tweeter Housing: The Tweeter Housing features a 1.125” silk dome tweeter which couples into an internal quartz aggregate load.
1) ACOUSTICAL PROPAGATION: The Illumination loudspeaker is configured to emulate a point-source. Transducers are vertically aligned. A set of charts and a protractor system is provided with the speaker system. The listening distance and ear height at the listening position correspond to chart information which gives transducer housing offsets. The protractor system allows the user to easily position the lateral displacement of the tweeter housing. With this alignment, the arrival times of each transducer at the ear is the same.
2) REAR WAVE LOAD TERMINATION: Several key areas are addressed by the design topology and the execution of the rear-wave loading in the cast bass cabinet. These include: internal resonant modes, turbulence, linear load progression and linear (face and load) throat air-flow patterns.
The Bass Cabinet housing for the Illumination was designed by Dale Pitcher over a three year period. This singular internal acoustical load configuration is the subject of several patents in process.
The Illumination Bass Cabinet pioneers a new direction in dynamic transducer housings. It combines Laminar-Flow Transmission Line, Exponential Horn and Aperiodic Load topologies in both parallel and series configurations throughout the progression of the acoustical load. Great effort has been placed in eliminating all internal turbulence patterns and resonances within the enclosure, and providing for a completely linear load progression. The result is bass energy freed from the constraints of compression, resonances and time overhangs – bass energy capable of startling dynamics on micro and macro levels.
3) SIGNAL PATH INTEGRITY: Considerable attention is paid to maintaining the integrity of the electrical signal path to the transducers. All connections are made with modified Cardas CPBP Binding Posts. Filter capacitors are made in-house and have extremely fast rise and settling times. The internal wiring harness is Mosaic Sigma Speaker Cable (which retails at $2000 for the 8’ pair). All signal path componentry is deep-cycle Cryogenically treated.
4) VIBRATIONAL CONSIDERATIONS / MECHANICAL ENERGY LOAD TERMINATION: The Illumination addresses the issues of spurious vibrations more than any other dynamic loudspeaker. Unaddressed vibration issues re-emerge as a modulated haze. The Illumination suspends music on a totally silent background that is alive with unmodulated ambient information.