1.888.955.6000
crutchfield.com
Crutchfield

Proficient Audio M8 (Factory Refurbished)

8-channel multi-room power amplifier

Zoom
  • Proficient Audio M8 (Factory Refurbished)

    Front

  • Proficient Audio M8 (Factory Refurbished)

    Back

 

Our take on the Proficient Audio M8 (Factory Refurbished)

by Dave Bar

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.

Read more

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.

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 from the Crutchfield Labs (what are the Labs?)

Features and Specs
General
Number of Channels 8
Power Output per Channel (8 ohms) 35
Power Output per Channel (6 ohms) ---
Power Output per Channel (4 ohms) 55
Frequency Response 20-20k
THD 0.07%
Bridged Power per Channel 110 watts
Speaker Outputs 8
THX Certification No
Width (inches) 17-3/16
Height (inches) 5-7/8
Depth (inches) 20-1/8
Weight 30 pounds
Parts Warranty 2 Years
Labor Warranty 2 Years
Inputs & Outputs
Number of Inputs 6
Level Controls Yes
Speaker Connectors Binding post
Product 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

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.

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.
 
Be the first to review this product
Great Gear Giveaway rewards card

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

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

Add accessories for the 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. See all categories & accessories

AudioQuest FLX-14/2 14-Gauge 2-Conductor In-Wall Speaker Cable UL-approved for in-wall use; direct-burial rated (125 feet)
51 people say
Your Price: $129.99
Add to Cart
AudioQuest FLX-14/4 14-Gauge 4-Conductor In-Wall Speaker Cable UL-approved for in-wall use; direct-burial rated (125 feet)
2 people say
Your Price: $219.99
Add to Cart
AudioQuest FLX-16/2 16-Gauge 2-Conductor In-Wall Speaker Cable UL-approved for in-wall use; direct-burial rated (125 feet)
28 people say
Your Price: $99.99
Add to Cart
AudioQuest FLX-16/4 16-Gauge 4-Conductor In-Wall Speaker Cable UL-approved for in-wall use; direct-burial rated (125 feet)
7 people say
Your Price: $159.99
Add to Cart
AudioQuest X2 Speaker Cable 14-gauge cable, connectors optional (30 feet, Gray)
23 people say
Your Price: $58.99
Add to Cart
AudioQuest G2 Speaker Cable 16-gauge cable, connectors optional (30 feet, Gray)
19 people say
Your Price: $38.99
Add to Cart
Monster XPHP™ MKII Speaker cable with clear jacket (100 feet)
8 people say
Your Price: $99.95
Add to Cart
Monster XP® Speaker cable with clear jacket, connectors optional (100 feet)
47 people say
Your Price: $64.95
Add to Cart
Monster XP® Navajo White MkII Speaker cable (50 feet)
2 people say
Your Price: $39.95
Add to Cart
3 people say
Your Price: $14.95
Add to Cart
63 people say
Your Price: $19.95
Add to Cart
5 people say
Your Price: $5.95
Add to Cart
4 people say
Your Price: $5.95
Add to Cart
10 people say
Your Price: $11.95
Add to Cart
4 people say
Your Price: $15.95
Add to Cart
9 people say
Your Price: $13.95
Add to Cart
Monster XP Mini Twist-on Pin Connectors 4 pair, 16-gauge (4 pair)
14 people say
Your Price: $11.95
Add to Cart
3 people say
Your Price: $10.99
Add to Cart
AudioQuest Evergreen Stereo interconnect cable with RCA plugs (0.6 meter/2 feet)
37 people say
Your Price: $31.99
Add to Cart
Monster Cable Stereo Audio 400i Stereo interconnect cables with RCA plugs (1 meter/3.3 ft.)
6 people say
Your Price: $39.95
Add to Cart
AudioQuest Golden Gate Stereo interconnect cable with RCA plugs (0.6 meter/2 feet)
16 people say
Your Price: $64.99
Add to Cart
Monster Cable Stereo Audio 200i Stereo interconnect cables with RCA plugs (1 meter/3.3 ft.)
14 people say
Your Price: $19.95
Add to Cart
AudioQuest Big Sur Stereo interconnect cable with RCA plugs (0.6 meter/2 feet)
3 people say
Your Price: $96.99
Add to Cart
AudioQuest Sydney Stereo interconnect cable with RCA plugs (0.6 meter/2 feet)
6 people say
Your Price: $154.99
Add to Cart
AudioQuest Columbia Stereo interconnect cables with RCA plugs (2-meter/6.6 feet)
1 person says
Your Price: $644.99
Add to Cart
Panamax MR4000 Power line conditioner and surge protector
1 person says
Your Price: $199.99
Add to Cart
Panamax M5300-PM Power line conditioner and surge protector
14 people say
Your Price: $539.99
Add to Cart
Panamax MR4300 Power line conditioner and surge protector
1 person says
Your Price: $299.99
Add to Cart
Panamax MR5100 Power line conditioner and surge protector
1 person says
Your Price: $439.99
Add to Cart
Panamax M5400-PM Power line regulator and surge protector
6 people say
Your Price: $739.99
Add to Cart
Furman Elite-15 PFi Power line conditioner and surge protector
8 people say
Your Price: $699.00
Add to Cart
Furman Elite-20 PFi Power line conditioner and surge protector
Your Price: $1,199.00
Add to Cart
Niles SVC100K Sliding stereo volume control with impedance magnification
Your Price: $129.99
Add to Cart
Niles VCS100K Stereo volume control with impedance magnification
4 people say
Your Price: $99.99
Add to Cart
Russound WALTX-2 Weatherproof stereo volume control with impedance magnification
Your Price: $134.99
Add to Cart
Niles WVC100E Weatherproof stereo volume control with impedance magnification
15 people say
Your Price: $124.99
Add to Cart
Sanus CFR1615 Modular open-frame component rack
6 people say
Your Price: $199.99
Add to Cart
Sanus CFR1620 Modular open-frame component rack
2 people say
Your Price: $229.99
Add to Cart
Sanus CFR2115 34"-tall steel component rack with heavy-duty casters
1 person says
Your Price: $529.99
Add to Cart
Sanus CFR2127 55"-tall steel component rack with heavy-duty casters
4 people say
Your Price: $749.99
Add to Cart
Sanus CFR2136 70"-tall steel component rack with heavy-duty casters
1 person says
Your Price: $1,099.99
Add to Cart
Sanus CFR2144 85"-tall steel component rack with heavy-duty casters
1 person says
Your Price: $1,299.99

After $200.00 Price Break

Add to Cart
Russound SDB-2.1 2-pair speaker and source selector with volume control
1 person says
Your Price: $199.00
Add to Cart
Russound AB-2.2 Tabletop A/B selector
3 people say
Your Price: $79.00
Add to Cart
Russound TBL-75 Tabletop volume control for multi-room audio systems
4 people say
Your Price: $119.99
Add to Cart
Russound EZB-1SC Connecting block for use with impedance matching volume controls
3 people say
Your Price: $59.00
Add to Cart
1 person says
Your Price: $19.99
Add to Cart

Why choose SquareTrade?

The #1-Rated Protection Plan

Thousands of people have reviewed SquareTrade Protection Plans — and made us #1.

5-Day Service Guarantee & Free Shipping

We'll repair or replace your item in five business days or less after we've received it, or your plan is free. And, as always, we pay for all shipping.

Protection from Normal, Everyday Use

Repairing your average mechanical or electrical failure can cost as much as buying a new device. With SquareTrade, you're covered — including parts and labor.

3 Year Protection Plan
3 Year Protection Plan
Your Price: $89.99
Add to Cart
4 Year Protection Plan
4 Year Protection Plan
Your Price: $119.99
Add to Cart

For a more in-depth review and enhanced detailed information on the Proficient Audio M8 (Factory Refurbished), please visit the Crutchfield website product page (/ISEO-rccbcspd/p_879M835X8R/Proficient-Audio-M8-Factory-Refurbished.html ).