Proficient Audio M8 (Factory Refurbished)

8-channel multi-room power amplifier

Item #: 879M835X8R

Out of Stock

Ship date unknown Reserve yours risk-free

1 Review | Ask Questions

Was:$999.99

Price Break:-$500.00

Your price: $499.99 Earn up to 500 Rewards points

Add to Cart Free Shipping Lifetime Tech Support

+ Add to wishlist

View all associated offers

Factory-refurbished and repacked with care

If you've been looking for a high-quality multichannel amplifier, but have been working on a tight budget, this factory-refurbished model may be just what you need. Proficient Audio is so confident you'll like it just as much as a brand new unit, they're including their full two-year warranty.

Flexible power where you need it

Proficient Audio's M8 eight-channel amplifier combines classic styling, a versatile design, plus high-performance sound for your whole-house music system. You can easily configure this powerful amp to best suit your specific multi-room applications. Enjoy clear stereo sound in four rooms, or combine two channels into one to give your speakers more juice — a great option for power-hungry outdoor speakers. Use a single channel of power for mono sound in smaller listening areas, like a walk-in closet or bathroom.

Enjoy music throughout your home

The M8 can distribute music from one audio source, such as a networked music streamer, to multiple rooms in your home. Or you can connect additional sources directly to the individual amplifier channels and assign each one to a single listening room. Each channel features its own separate level control so you can easily adjust the volume to fine-tune the sound of your system. Optional audio and voltage sensing capabilities automatically turn the amp on and off with the rest of your
system. And to top it off, the M8's heavy cast-aluminum front panel makes it a handsome addition to any equipment rack.

Product Highlights:

  • 8-channel amplifier
  • power output:
    • 35 watts RMS per channel into 8 ohms (two channels driven, remaining channels driven at 1/8 of rated power)
    • 55 watts RMS per channel into 4 ohms (two channels driven, remainder undriven)
    • each pair of adjacent channels are bridgeable for 110 watts RMS into 8 Ohms (two channels driven, remainder undriven)
  • frequency response (at 1 watt, 8 ohms): 9.5-80,000 Hz (±1.5 dB)
  • signal-to-noise ratio: greater than 120 dB
  • total harmonic distortion (at rated power): 0.070%
  • individual RCA audio inputs for all 8 channels
  • stereo RCA main bus and auxiliary inputs for connecting audio sources
  • stereo RCA main bus and auxiliary outputs for "daisy-chaining" up to four amplifiers for very large systems
  • source selection switch for each channel allows you to select between the common bus or auxiliary inputs, or the individual channel input
  • individual selector switches allow three audio playback options for each channel: left, right, or left plus right (mono)
  • independent line-level controls for all 8 channels
  • three turn-on modes: audio signal sensing, voltage trigger, and manual
  • 12-volt DC control output
  • gold-plated binding post speaker connectors for all channels
  • eight front-panel LED status lights with independent thermal and short-circuit protection circuits for each channel
  • detachable AC power cord
  • 17-3/16"W x 5-7/8"H x 20-1/8"D
  • weight: 30 lbs.
  • warranty: 2 years
  • Our 60-day money-back guarantee

Hands-on research

What's in the box?

Download owner's manual

  • Refurbished 8-channel amplifier
  • 6' AC power cord
  • 2 Rack-mount brackets
  • Installation/User Guide

Product Research

Features

Distributed Audio: The Proficient M8 amplifier delivers the power and fidelity needed to distribute music throughout your home. This amplifier includes the necessary features needed for flexible, reliable custom installation. Sophisticated design and superior internal components, result in outstanding sound quality, performance, and long term reliability.

35W x 8Ch High-Current Amp: The Proficient M8 amplifier is rated at 35 watts x 8 channels (in 8 at 20-20kHz with 2-channels driven and 0.07% THD), or 55 watts x 8 channels (in 4 at 20-20kHz with 2-channels driven and 0.1% THD). It provides pure, high-current sound.

Bridgeable: The power output of adjacent amplifier channels can be combined to provide extra power when needed in certain locations & applications. This is easily accomplished by flipping a single switch on the amplifier's rear-panel. Bridged power rating of the amplifier is 110 watts x 4 channels (in 8 at 20-20kHz with 2-channels driven and 0.5% THD)

Binding Posts: The Proficient M8 amplifier is fitted with gold-plated, binding posts for each channel. The sixteen binding-post terminals will accept bare-wire (up to 12AWG), pin-connectors, and banana plugs (dual or single). Us the following chart to determine the proper wire gauge based on actual overall wire length from the M8 the speaker.

Speaker Wire Length Speaker Wire Gauge
150' 16 AWG
400' 14 AWG
1000' 12 AWG

Flexible Input Selection: With selectable Line, Bus, and Aux inputs, the M8 can simultaneously output multiple audio sources. Each of the amplifier channels can be assigned a variety of source inputs; a dedicated input can be assigned to each channel or each channel can be configured to play common signals from the Bus or Auxiliary inputs. This provides the flexibility needed in sophisticated custom audio installation.

  • Line Inputs: The Line inputs (RCA) allow amplification of up to eight mono or four stereo sources for discrete playback in multizone applications.
  • Bus Input: The Bus input (stereo RCA) can each feed the same audio source to any of the eight channels allowing optional distribution of mono and/or stereo sources to multiple rooms.
  • Aux Input: The Aux left and right RCA inputs are fed to the respective left and right output channels for distribution of two mono sources to up to four rooms each or one stereo source to four rooms.

Controls: The Proficient M8 amplifier offers Channel Input selection and Channel Level adjustment on the rear-panel.

  • Channel Input Switch: Each Eight 4-position switches allow you to select the input to each channel. These switches allow multiple audio sources to be connected and played simultaneously. The Line In setting feeds audio only to its dedicated channel. The Bus L/R setting sets a channel's input to the source connected to the amplifier's Bus input. The Aux L/R setting will set a channel's input to the source connected to the Aux input.
  • Channel Level Adjustment: Each channel has its own level adjustment. This allows the loudness of each speaker to be perfectly matched to its location and application and balance your system's sound.

Bus Loop: For larger systems, the Bus Loop can be used to connect up to four additional M8 amplifiers for a total of up to twenty rooms of amplified audio.

Protection Circuitry: Each channel of the amplifier is individually protected. If the advanced circuitry determines that a channel must be shut down for protection (a rare occurrence) only the channel affected will be turned off, while the other channels continue to play. Once conditions return to normal, the affected channel will be turned back on and operate as normal.

Note: When the Protection LEDs (Red) on front of the amplifier are lit, it is indicating either a fault in the wiring, the speaker, or the amplifiers of that particular channel.

Power Modes: There are three ways to turn the amplifier on; Constant, Trigger, or Audio Sense. This allows the amplifier to operate seamlessly as part of a sophisticated custom installation. The 3-way power mode switch is located on the amplifier's rear-panel.

  • Constant: Select Constant mode when you wish to manually turn the amplifier on and off by using the front mounted power button.
  • Trigger: Use Trigger mode if you prefer the amplifier turn on when it receives voltage (3-30V) from an external source and turn off once that voltage has stopped. The voltage source must be connected to the trigger input jack (3.5mm) on back of the amplifier.
  • Audio Sense: Audio Sense mode turns on the amplifier when the amp's main input receives an audio signal. Once the signal stops, the amplifier waits 3 minutes and then turns itself off.

Trigger Output: A separate output trigger (3.5mm) allows the amplifier to activate other components via a 12-volt trigger.

Cast Aluminum Front-Panel: The Proficient M8 amplifier features a cast aluminum front-panel for added rigidity and a great look.

Air Flow Design: The Proficient M8 is designed to run cool under most normal operating conditions, but may run warm with multiple channels running at moderate to high output. It is typical for an eight-channel amplifier to generate certain amount of heat dissipation that need to be properly ventilated. When installing the M8 a few steps should be taken to assure proper air flow:

  • Never block the vent holes on the top or bottom of the M8.
  • Never remove the feet on the bottom of the M8.
  • Leave at least 2" above and 1" on each side of the M8 for free air flow.
  • Whenever possible, provide vent holes in the shelf under the M8 to increase air flow into the bottom of the unit.
  • Leave the back of the cabinet as open as possible for good air circulation.
  • Place other system component on separate shelves.
  • Install fans in cabinets and racks when equipment is generating high heat levels.
Note: Closed spaces such as equipment cabinets and racks can get hot with the heat generated by microprocessors and motors in various devices. Providing proper ventilation for good air flow will help keep the temperature down and protect not only the M8, but all system components and help preserve their longevity.
Rack Mountable: The amplifier includes a set of rack ears for rack mounting applications.

Our Product Research Team

At Crutchfield, you'll get detailed, accurate information that's hard to find elsewhere. That's because we have our own in-house Product Research team — they open the box, verify contents, check the owner's manual, and record dimensions, features and specs. We stay on top of new products and technologies to help people make informed choices.

Proficient Audio M8 (Factory Refurbished) Reviews

Average Customer Review:

1 reviews
Review this product
Great Gear Giveaway

Submit a review and then enter to win a $500 rewards card

(0)
(0)
(0)
(0)
(0)

Review this product:

Thanks for taking the time to share your experiences about this product. Please be sure to focus your comments on the product itself. Read our Review Guidelines for more information.

Your email won't be visible. Please use the email address that is associated with your order.
(e.g., JohnD) Your review will be signed using the display name and location
(e.g., Charlottesville, VA)

Click on a star to rate the overall product on a scale of 1-5
1500 characters left
  Attach a YouTube Review
Crutchfield Video Review Guidelines
  • Only submit videos that you made or are authorized to use.
  • Do not submit videos that contain music, video or visuals that are copyrighted and belong to someone else.
  • Please see our Review Guidelines for more information.
500 characters left
500 characters left

Proficient Audio M8 (Factory Refurbished)

Written By Anonymous, Arkansas on Thursday, September 25, 2014

Not happy with the quality or ease to use. Thought I would be able to pick the speakers I wanted to use but only on the back of the unit is that available

Get everything you’ll need to enjoy your new Proficient Audio M8 (Factory Refurbished)

You'll need speaker wire to get the signal from your new amplifier to your speakers. UL-listed wire is specifically designed for in-wall installation.
Make the speaker hook-ups easy with connectors.
Better cables give you less noise and more sound.
Protect your investment and get better performance with quality power protection for your gear.
Control the volume in each room with a stylish volume controller.
Have your new equipment installed by qualified professionals.
A better subwoofer cable will give your subwoofer the tools it needs to recreate the deep bass on your music and movies.
AudioQuest FLX-14/2 14-Gauge 2-Conductor In-Wall Speaker Cable

AudioQuest FLX-14/2 14-Gauge 2-Conductor In-Wall Speaker Cable

UL-approved for in-wall use; direct-burial rated (125 feet)

Item #: 703142125

(52)

$129.99
Add to Cart
AudioQuest FLX-14/4 14-Gauge 4-Conductor In-Wall Speaker Cable

AudioQuest FLX-14/4 14-Gauge 4-Conductor In-Wall Speaker Cable

UL-approved for in-wall use; direct-burial rated (125 feet)

Item #: 703144125

(2)

$219.99
Add to Cart
AudioQuest FLX-16/2 16-Gauge 2-Conductor In-Wall Speaker Cable

AudioQuest FLX-16/2 16-Gauge 2-Conductor In-Wall Speaker Cable

UL-approved for in-wall use; direct-burial rated (125 feet)

Item #: 703162125

(28)

$99.99
Add to Cart
AudioQuest FLX-16/4 16-Gauge 4-Conductor In-Wall Speaker Cable

AudioQuest FLX-16/4 16-Gauge 4-Conductor In-Wall Speaker Cable

UL-approved for in-wall use; direct-burial rated (125 feet)

Item #: 703164125

(7)

$159.99
Add to Cart
AudioQuest X2 Speaker Cable

AudioQuest X2 Speaker Cable

14-gauge cable, connectors optional (30 feet, Gray)

Item #: 703X230G

(27)

$58.99
Add to Cart
AudioQuest G2 Speaker Cable

AudioQuest G2 Speaker Cable

16-gauge cable, connectors optional (30 feet, Gray)

Item #: 703G230G

(20)

$38.99
Add to Cart
Monster XPHP™ MKII

Monster XPHP™ MKII

Speaker cable with clear jacket (100 feet)

Item #: 119XPHP100

(10)

$99.95
Add to Cart
Monster XP®

Monster XP®

Speaker cable with clear jacket, connectors optional (100 feet)

Item #: 119XPMS1H

(52)

$64.95
Add to Cart
Monster XP® Navajo White MkII

Monster XP® Navajo White MkII

Speaker cable (50 feet)

Item #: 119XPNWS50

(2)

$39.95
Add to Cart
Monster Cable Dual Banana Speaker Connectors

Monster Cable Dual Banana Speaker Connectors

1 pair

Item #: 119MBDRHT2

(3)

$14.95
Add to Cart
Monster crimp-on mini bananas

Monster crimp-on mini bananas

1 pair, 16-gauge

Item #: 119MTMB

(5)

Monster crimp-on banana connectors

Monster crimp-on banana connectors

1 pair, 12-gauge

Item #: 119MTRB

(4)

Monster Twist-on Mini Banana Connectors

Monster Twist-on Mini Banana Connectors

2 pair, 16-gauge

Item #: 119MTTMH2

(12)

$11.95
Add to Cart
Monster Twist-on Banana Connectors

Monster Twist-on Banana Connectors

2 pair, 12-gauge

Item #: 119MTTRH2

(4)

$15.95
Add to Cart
Monster Cable Twist-on Angled Gold Pins

Monster Cable Twist-on Angled Gold Pins

4 pair, 12-gauge

Item #: 119AGPTRH2

(9)

$13.95
Add to Cart
Monster XP Mini Twist-on Pin Connectors

Monster XP Mini Twist-on Pin Connectors

4 pair, 16-gauge (4 pair)

Item #: 119GPTMH

(14)

$11.95
Add to Cart
On-Q Banana Plugs

On-Q Banana Plugs

1 pair

Item #: 717WP34831

(3)

$10.99
Add to Cart
AudioQuest Evergreen

AudioQuest Evergreen

Stereo interconnect cable with RCA plugs (0.6 meter/2 feet)

Item #: 703EGRR06M

(40)

$31.99
Add to Cart
Monster Cable Stereo Audio 400i

Monster Cable Stereo Audio 400i

Stereo interconnect cables with RCA plugs (1 meter/3.3 ft.)

Item #: 119MC4001M

(7)

$39.95
Add to Cart
AudioQuest Golden Gate

AudioQuest Golden Gate

Stereo interconnect cable with RCA plugs (0.6 meter/2 feet)

Item #: 703GGRR06M

(17)

$64.99
Add to Cart
Monster Cable Stereo Audio 200i

Monster Cable Stereo Audio 200i

Stereo interconnect cables with RCA plugs (1 meter/3.3 ft.)

Item #: 119MC2001M

(15)

$19.95
Add to Cart
AudioQuest Big Sur

AudioQuest Big Sur

Stereo interconnect cable with RCA plugs (0.6 meter/2 feet)

Item #: 703BSRR06M

(4)

$96.99
Add to Cart
AudioQuest Sydney

AudioQuest Sydney

Stereo interconnect cable with RCA plugs (0.6 meter/2 feet)

Item #: 703SDRR06M

(6)

$154.99
Add to Cart
AudioQuest Columbia

AudioQuest Columbia

Stereo interconnect cables with RCA plugs (2-meter/6.6 feet)

Item #: 703CMB2MR

(1)

$644.99
Add to Cart
Panamax MR4000

Panamax MR4000

Power line conditioner and surge protector

Item #: 299MR4000

(1)

$199.99
Add to Cart
Panamax M5300-PM

Panamax M5300-PM

Power line conditioner and surge protector

Item #: 299M5300PM

(15)

$539.99
Add to Cart
Panamax MR4300

Panamax MR4300

Power line conditioner and surge protector

Item #: 299MR4300

(3)

$299.99
Add to Cart
Panamax MR5100

Panamax MR5100

Power line conditioner and surge protector

Item #: 299MR5100

(1)

$439.99
Add to Cart
Panamax M5400-PM

Panamax M5400-PM

Power line regulator and surge protector

Item #: 299M5400PM

(6)

$739.99
Add to Cart
Furman Elite-15 PFi

Furman Elite-15 PFi

Power line conditioner and surge protector

Item #: 756ELT15PF

(11)

$699.00
Add to Cart
Furman Elite-20 PFi

Furman Elite-20 PFi

Power line conditioner and surge protector

Item #: 756ELT20PF

$1,199.00
Add to Cart
Niles SVC100K

Niles SVC100K

Sliding stereo volume control with impedance magnification

Item #: 190SVC100K

$129.99
Add to Cart
Niles VCS100K

Niles VCS100K

Stereo volume control with impedance magnification

Item #: 190VCS100K

(5)

$99.99
Add to Cart
Russound WALTX-2

Russound WALTX-2

Weatherproof stereo volume control with impedance magnification

Item #: 543WALTX2

$134.99
Add to Cart
Niles WVC100E

Niles WVC100E

Weatherproof stereo volume control with impedance magnification

Item #: 190WVC100E

(15)

$124.99
Add to Cart
Sanus CFR1615

Sanus CFR1615

Modular open-frame component rack

Item #: 051CFR1615

(7)

$199.99
Add to Cart
Sanus CFR1620

Sanus CFR1620

Modular open-frame component rack

Item #: 051CFR1620

(2)

$229.99
Add to Cart
Sanus CFR2115

Sanus CFR2115

34"-tall steel component rack with heavy-duty casters

Item #: 051CFR2115

(2)

$529.99
Add to Cart
Sanus CFR2127

Sanus CFR2127

55"-tall steel component rack with heavy-duty casters

Item #: 051CFR2127

(4)

$749.99
Add to Cart
Sanus CFR2136

Sanus CFR2136

70"-tall steel component rack with heavy-duty casters

Item #: 051CFR2136

(1)

$1,099.99
Add to Cart
Sanus CFR2144

Sanus CFR2144

85"-tall steel component rack with heavy-duty casters

Item #: 051CFR2144

(1)

$1,299.99
Add to Cart
Russound SDB-2.1

Russound SDB-2.1

2-pair speaker and source selector with volume control

Item #: 543SDB21

(1)

$199.00
Add to Cart
Russound AB-2.2

Russound AB-2.2

Tabletop A/B selector

Item #: 543AB22

(4)

$79.00
Add to Cart
Russound TBL-75

Russound TBL-75

Tabletop volume control for multi-room audio systems

Item #: 543TBL75

(4)

$119.99
Add to Cart
Niles® 12-Volt DC Adapter

Niles® 12-Volt DC Adapter

Item #: 19012VUNIV

(1)

$19.99
Add to Cart
Monster Cable® 400sw2

Monster Cable® 400sw2

Subwoofer cable (12 feet)

Item #: 119140711

$49.99
Add to Cart

Questions & Answers Ask the community. Share your knowledge.