McIntosh MAC6700 Solid State Receiver With HD FM/AM Radio, DAC, MC/MM Phono

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General:

Fantastic piece from McIntosh and a recent revival as McIntosh took some time off from making full featured receivers.

This one has it all. 200W per side *with* autoformers, gorgeous blue meters. built-in HD Radio and FM/AM tuner, outstanding headphone amp, built in DAC, and a capable MC and MM phono section.

If you're looking for a one piece solution for a 2 channel system this might be perfect for you.

McIntosh Performance Features Include:
• Power Output with Patented Autoformer
The MAC6700 consists of a 200 watts per channel stereo Power Amplifier with less than 0.005% distortion. The McIntosh designed and manufactured Autoformer allows connection of 2, 4 or 8 ohm Loudspeakers. The Power Amplifier uses ThermalTrak Output Transistors for lower distortion and cool operation.

• Digital Audio Inputs
The MAC6700 has Coaxial, Optical and USB Digital Inputs to Decode PCM Signals from an external source. The MA/MAC6700 Up Samples the Digital Signal to 192kHz with 32Bit resolution before the Digital to Analog process begins.

• Moving Coil and Moving Magnet Phono Inputs
The MAC6700 contains two different precision Phono Preamplifier Circuits. One for low output Moving Coil Phono Cartridges with selectable resistance loading, the other is for Moving Magnet Cartridges. Both circuits use the latest designs to provide the lowest possible noise and distortion. The RIAA Correction Equalization Circuitry utilizes close tolerance resistors and capacitors for an extremely flat frequency response.

TM2 Tuner Module Performance Features • Reception
The TM2 Tuner Module with HD Radio Technology allows for the reception of high quality FM and AM Radio Broadcasts in regions where available.

• Digital Sound
Digital, CD-quality sound. HD Radio Technology enables local radio stations to broadcast a clean digital signal. AM sounds like today’s FM and FM sounds like a CD.

Brand Background:

McIntosh Laboratory is an American manufacturer of handcrafted high-end audio equipment based in Binghamton, New York. The company was founded in 1949 by Frank McIntosh. The company designs and produces audio amplifiers, stereo tuners and other consumer electronics products.

Ownership:

Single Owner

Connections:

Inputs:
• USB (Type B) input for connection to a computer
Supported bit depth and sample rates: up to 32-bit/192kHz (dedicated McIntosh USB audio driver required for playback on a Windows® PC, free USB driver download available from McIntosh's website)
• 1 optical and 1 coaxial digital audio input
Supported bit depth and sample rates: up to 32-bit/96kHz
• 1 set of balanced stereo XLR inputs
• 5 stereo RCA audio inputs
• Separate RCA phono inputs for moving magnet (MM) and moving coil (MC) cartridges
adjustable input impedance loading for optimum sonic performance with a range of MC cartridges (50-, 100-, 200-, 400-, and 1000-ohm settings)
• IR input for connecting an IR receiver

Outputs:
• Custom McIntosh gold-plated binding-post speaker connectors with 2-ohm, 4-ohm, and 8-ohm output taps to match speaker impedance
• Dull-size headphone output (20-600 ohms recommended impedance)
• RCA preamp out/power amp input jacks

General Sound:

Smooth, uncolored, undistorted natural and clean

Cosmetic Condition:

8 - Very Slight Signs of Use

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

Working Condition:

Working perfectly and tested in our lab and listening room. 

Included:

MAC6700, McIntosh Double-Shipping Carton, Remote, Manual, and not-pictured RAA2 External AM Antenna with RAA2  Connecting Cable.

Packing:

Original Manufacturers Packing

Original MSRP:

$6,500.00

Dimensions:

Width is 17-1/2 inches (44.45cm)
Height is 7-5/8 inches (19.37cm) including feet
Depth is 22 inches (55.88cm) including the Front Panel, Knobs and Cables

Shipping Carton Dimensions
Width is 29-1/2 inches (74.93cm)
Depth is 29 inches (73.66cm)
Height is 17 inches (43.18cm)

Weight:

75 pounds (34.1 kg) net
93 pounds (42.3 kg) in shipping carton

Approximate Age:

2018

Reviews:

https://perfectacoustic.co.uk/mcintosh-ma6700/

Link to Manual:

https://www.mcintoshlabs.com/-/media/Files/mcintoshlabs/DocumentMaster/us/ma6700om02.ashx

Recommended Cables:

Kimber Kable - RCA Interconnects - Better

Kimber Kable - RCA Interconnects - Best

Kimber Kable - BALANCED XLR Connectors - Better

Kimber Kable - BALANCED XLR Connectors - Best

Kimber Kable - Select Series Reference USB Cable

Kimber Kable - Coaxial Digital Interconnect

Kimber Kable - Optical Digital Interconnect

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 

Kimber Kable - Power Cords - Best

Testing Process:

The SkyFi Testing Process for Preamplifiers:

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 PCB’s 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.

When we first power on a preamplifier we connect its RCA output to a Sencore PA81 Power Analyzer which simulates real world loading conditions and gives us an oscilloscope interface. The first order of business is checking that the volume control works smoothly throughout its entire range with acceptable channel balance. This is accomplished by feeding a 1KHz sine wave into one of the preamp’s line level inputs while monitoring the preamp’s output on an oscilloscope. We then switch to a 1KHz square wave to test the tone controls, loudness function, and filters where applicable. During this step we are watching for equal alteration of the test signal by both channels. This also helps us identify dirty controls that will need treatment. Once the basic line stage functions are verified, we test each input individually. This is especially important for devices that use relays to select their sources. If the preamp is equipped with a phono stage we test that as well. We use an inverse RIAA filter which allows us to feed a reference test signal into the phono input with the proper RIAA equalization and level. A square wave or sine sweep is used to verify that the device’s phono stage is faithfully reproducing the RIAA curve. If the preamp under test has balanced inputs and/or outputs these are tested as well.

We finish up our bench testing with a listening test with our bench amplifier and reference speakers. During this test we check for hum or hiss that may not have shown up in earlier testing. We also check that all of the tone controls and filters perform as expected. If the preamplifier has remote control functions these are also tested. Preamps with tube circuits or complicated power supply topologies are connected at our long term test rig for extended stress testing under real world conditions.

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.

The SkyFi Testing Process for Tuners:

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. Vintage analog tuners also have moving parts related to the tuning gang and dial string. These parts are inspected for smooth operation.

If the unit passes visual inspection it is bench tested for a handful of key performance parameters using a Sencore SG80 AM/FM Stereo Analyzer. The SG80 allows us to “simulate” an ideal radio station using precision test signals instead of music. This device, in conjunction with an oscilloscope allows us to properly evaluate the following parameters:

1. AM Reception (Where Applicable)

2. FM Mono Reception & Tuning Meter Function

3. FM MPX Reception (Stereo)

4. Dial Tracking - How accurately the tuner dial or display indicates the actual frequency of the broadcast being received.

5. Stereo Separation - A properly working stereo tuner will have minimal crosstalk between the left and right channel.

6. Sensitivity & Signal Strength Meter Function - By lowering the output of the SG80 we can simulate weak stations and determine how well the tuner will be able to pull in weak distant stations. This adjustment also helps us verify signal strength meter function.

If the tuner has acceptable performance related to the parameters above we connect the unit for listening tests with a simple dipole antenna. We listen for audio reproduction quality of local stations and evaluate how many stations the tuner can receive while we sweep through the dial. We are looking to verify that the tuner can decode stereo on strong local broadcasts and pick up a wide variety of local stations at the bottom, middle, and top of the frequency band. At this point we also test convenience features such as muting, filters, built in oscilloscope function, etc.

We finish up with an extended listening test on our long term test rig. We tune in a strong local station and monitor for drift over a 2-3 hour period.

Specs:

Amplifier Specifications
Power Output
200 watts is the minimum sine wave continuous aver- age power output per channel, both channels operating

Output Load Impedance
2, 4 or 8 ohms

Rated Power Band
20Hz to 20,000Hz

Total Harmonic Distortion
0.005% maximum with both channels operating from 250 milliwatts to rated power, 20Hz to 20,000Hz

Dynamic Headroom
2.0dB

Frequency Response
+0, -0.5dB from 20Hz to 20,000Hz
+0, -3dB from 10Hz to 100,000Hz

Preamplifier Output 1 and 2 (for rated input)
1.4V unbalanced (8V Maximun)

Sensitivity (for rated output)
High Level, 250mV unbalanced, 500mV balanced
Phono MM, 2.5mV
Phono MC, 0.25mV
Power Amp In, 1.4V

Signal To Noise Ratio (A-Weighted)
High Level, 95dB below rated output
Phono MM, 84dB below 5mV input
Phono MC, 82dB below 0.5mV input
Power Amplifier, 113dB below rated output

Intermodulation Distortion
0.005% maximum, if the instantaneous peak power is 400 watts or less per channel with both channels oper- ating for any combination of frequencies from 20Hz to 20,000Hz

Wide Band Damping Factor
Greater than 40

Input Impedance
High Level, 20K ohms
Phono MM, 47K ohms; 50pF
Phono MC, 50, 100, 200, 400 or 1,000 ohms; 100pF
Power Amp In, 10K ohms

Maximum Input Signal
High Level, 8V unbalanced, 16V balanced
Phono MM, 80mV
Phono MC, 8mV
Power Amplifier In, 16V

Preamplifier Output Impedance
220 ohms

Headphone Output Impedance
20 to 600 ohms

Power Guard
Less than 2% THD with up to 16dB overdrive at 1,000Hz

Voltage Gain
High Level to Rec Output: 0dB
High Level to Output 1 and 2: 15dB
Phono MM to Rec Output: 40dB
Phono MC to Rec Output: 60dB
Phono MM to Output 1 and 2: 55dB
Phono MC to Output 1 and 2: 75dB
Power Amplifier: 29dB

Tone Controls
Bass Control ±12dB (1dB steps) @ 30Hz
Treble Control ±12dB (1dB steps) @ 10,000Hz

Digital Input Sample Rates
Optical: 16Bit, 24Bit - 32kHz to 96kHz
Coaxial: 16Bit, 24Bit - 32kHz to 96kHz
USB: 16Bit, 24Bit, 32Bit - 32kHz to 192kHz

Power Control and Trigger Output
12VDC, 25mA

TM2 - FM HD Radio Specifications
Sensitivity
-85dBm

Signal To Noise Ratio
85dB

Frequency Response
± 1dB from 20 to 20,000Hz

Harmonic Distortion
0.1%

Stereo Separation
80dB

TM2 - FM Analog Specifications
FM Tuning Range
87.5MHz - 107.9MHz

FM Channel Spacing
200kHz

Useable Sensitivity
1.6uV (15.2dBf)

50dB Quieting Sensitivity
1.8uV (16.2dBf)

Signal To Noise Ratio
Mono: 75dB Stereo: 72dB

Frequency Response
± 1dB from 20 to 13,000Hz

Harmonic Distortion
Mono: 0.1%

TM2 - FM Analog Specifications, con’t
Stereo: 0.4%

Channel Selectivity
65dB Adjacent Channel 74dB Alternate Channel

Stereo Separation
35dB

TM2 - AM HD Radio Specifications
Signal To Noise Ratio
85dB

Frequency Response
20 to 15,000Hz

Harmonic Distortion
0.1%

Stereo Separation
75dB

TM2 - AM Analog Specifications
AM Tuning Range
530kHz - 1710kHz

AM Channel Spacing
10kHz

Sensitivity
550uV/m

Signal To Noise Ratio
45dB

Frequency Response
+ 0, - 6dB from 100 to 3,500Hz

Harmonic Distortion
0.25%, 80% Modulation

Selectivity
50dB Adjacent Channel

TM2 - General Specifications
FM Antenna Input
75 ohms, Type “F” Coax connector

AM Antenna Input
Balanced, RJ45 connector
(for use only with supplied McIntosh RAA2 Remote AM Antenna)

RAA2 Connection Cable
20 foot (6.09m) 8 conductor straight-thru cable with an outer shield and RJ45 connectors on each end (shielded CAT5 or CAT6 patch cable)

RAA2 Remote AM Antenna Overall Dimensions
Width is 6 inches (15.24cm)
Height is 2-1/2 inches (6.35cm)
Depth is 1-1/2 inches (3.81cm)

General Specifications
Power Requirements
Field AC Voltage conversion of the MA/MAC6700 is not possible. The MA/MAC6700 is factory configured the following AC Voltages:
120 Volts, 50/60Hz at 4.4 amps
Standby: Less than 0.25 watt
Note: Refer to the rear panel of the MA/MAC6700 for the correct voltage.

Overall Dimensions
Width is 17-1/2 inches (44.45cm)
Height is 7-5/8 inches (19.37cm) including feet Depth is 22 inches (55.88cm) including the Front Panel, Knobs and Cables