Ayre Acoustics MX-R Monoblock Amplifiers - Just Serviced by Ayre

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Highly desirable set of MX-R monoblocks from Ayre capable of 300W into 8 ohms, 600W into 4 ohms, or a massive 1200W into 2 ohms. 

Freshly returned from the factory in Colorado where they were serviced and are working perfectly. We have a copy of the official service sheet for the new owner (see last photos).

A tremendous value considering the slightly different and current version, the MX-R Twenty now retails for $35k a pair.

These MX-R's are also capable of being upgraded at the factory to "Twenty" specification down the road if you see it necessary. My guess is the the MX-R will be enough of a substantial upgrade for most audiophiles to skip the upgrade.

Functionally they are perfect and working to factory specifications. Cosmetically they have some signs of use including a few nicks on the corners, visible upon close inspection.

Brand Background:

Ayre Acoustics, Inc. has been designing and building superior quality, award-winning audio and video equipment since 1993. Ayre is recognized as a world leader in the industry, and its full line of audio and video components sets new standards in innovation, design, and performance. We proudly offer the finest equipment for your listening and viewing pleasure.

Our mission is to create audio and video systems that provide a lifetime of excitement and discovery. Combining stunning realism with exceptional clarity. Ayre components offer a natural, relaxed presentation that draws you into your favorite music and films as never before. Ayre's bold, unique design approach ensures superlative levels of performance. Every design detail is focused on a single aim-unprecedented musical and cinematic delight. All of our products employ Ayre's exclusive fully-balanced, zero-feedback circuitry, with special emphasis lavished on the power supply. The result is a new world of artistic insight and experience

Ayre products are manufactured in Boulder, Colorado. Each component is carefully hand-assembled on-site by a dedicated technician, using only state-of-the-art materials and assembly techniques. Quality control is assured by a rigorous testing procedure, as well as a thorough inspection process. Ayre's services and support is unsurpassed. Our environmentally responsible manufacturing processes include the careful selection of equally conscientious American suppliers. Enter the world of Ayre; enter a new dimension of musical meaning and cinematic enjoyment.

Ownership:

Single Owner

Connections:

XLR Inputs, IEC Power Cord, Spade Speaker Binding Posts

General Sound:

Neutral sound with little to no coloration 

Cosmetic Condition:

7 - Some Wear and Light Scratches 

https://skyfiaudio.com/pages/our-rating-scale

Working Condition:

Working perfectly and tested in our lab.

Included:

Just the units as pictured and two power cords

Packing:

Will be packed using our highly developed in-house process and custom packing materials.Original MSRP:

$17,000.00

Dimensions:

11" (280mm) W by 3.75" (96mm) H by 18.75" (480mm) D. 

Weight:

120 / Pair

Approximate Age:

2010

Reviews:

https://www.stereophile.com/solidpoweramps/407ayre/index.html

Link to Manual:

https://www.ayre.com/wp-content/uploads/2018/06/Ayre_MXR_Manual.pdf

Recommended Cables: 

Kimber Kable - BALANCED XLR Connectors - Better

Kimber Kable - BALANCED XLR Connectors - Best

Kimber Kable - Speaker Cables - Better

Kimber Summit Series Monocle XL Speaker Cables (PAIR) - Best

Kimber Summit Series BiFocal XL Bi-Wire Speaker Cables (PAIR) - Best If Applicable 

Kimber Kable - Power Cords - Better

Testing Process:

The SkyFi Testing Process for Solid State Amplifiers:

We start with a visual inspection of all internal components to make sure that there are no signs of heat stress or damage. Capacitors are checked for telltale signs of predictive failure including bulging, shrunken wrappers, or physical leakage. We also inspect the PCBs for discoloration from resistors or transistors that may have been running hot. On vintage units we often spot check select capacitors for value and ESR.

If the amplifier passes visual inspection, we move on to a controlled power on sequence using a Sencore safety analyzer to monitor current draw in real time. Once the amplifier is determined to be safe to operate, we connect it to full AC mains for function and power testing. We connect the speaker outputs of the amplifier to a Sencore PA81 Power Analyzer which acts as a dummy load, DC offset monitor, and oscilloscope interface. We start with a low level 1KHz test signal at the amplifier’s input and slowly increase its amplitude while monitoring the output on an oscilloscope for signs of noise, clipping, distortion, or improper channel balance. We continue increasing the signal level until the amplifier reaches clipping. At this point we take an output power measurement and compare it to the spec sheet of the amplifier to verify proper performance. If the device under test has both balanced and single ended inputs they are both tested at this time. We finish off the bench evaluation with a 1KHz square wave check and a 20Hz to 20KHz sine sweep to assess the amplifier’s frequency response characteristics. This battery of tests will usually reveal if the amplifier has any issues that need further attention.

Before the device leaves the bench, we perform a listening test with actual music using a variety of preferred test tracks. Our benches are outfitted with familiar monitor speakers which help us identify inconsistencies that will not always show up on our test gear. The main things that we are listening for are hum or noise with no signal present, proper center image, clicks, pops, or any other obvious undesirable audio characteristics.

If the unit passes all of these tests it is moved to our long term testing rig where we simulate real word operating conditions for 6-8 hours. This allows us to monitor the unit for signs of thermal runaway or intermittent issues that only crop up when the unit has fully come up to temperature.

Specs:

Solid-state monophonic power amplifier. Inputs: one balanced. Output power: 300Wpc into 8 ohms (24.8dBW), 600Wpc into 4 ohms (24.8dBW). Frequency range: 0Hz–250kHz. Voltage gain: 26dB. Input impedance: 2 megohms. Power consumption: 34W (standby), 120W (operating/no signal).

Dimensions & Weight: 11" (280mm) W by 3.75" (96mm) H by 18.75" (480mm) D. Weight: 52 lbs (23.6 kg).