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AudioSource AD508

8-channel multi-room digital power amplifier

4 Reviews

Item # 021AD508

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Was: $849.99

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Our take on the AudioSource AD508

Did you buy a house that came with speakers already installed in the walls or ceilings? Or are you planning to put in a system like that from scratch? In either case, I can recommend AudioSource's AD508 as an amplification option for your medium-sized home.

Play music in four rooms at the same time

Did you buy a house that came with speakers already installed in the walls or ceilings? Or are you planning to put in a system like that from scratch? In either case, I can recommend AudioSource's AD508 as an amplification option for your medium-sized home.

This high-current, four-zone amp powers up to eight speakers simultaneously. It's flexible too. Play the same source through all four zones, or have a different source play in each of your zones.

Plenty of power under the hood

AudioSource made sure that the '508 has enough horsepower for your speakers. It delivers 65 watts per channel into eight ohms, and a robust 100 watts per channel into four ohms. Need a mountain of power to drive your heavy-duty outdoor or floor-standing speakers? Bridge two channels together and get a mighty 200 watts per channel into eight ohms.

Versatile inputs...

The AD508 offers two pairs of RCA inputs, as well as one optical digital input. These are handy for playing multiple sources in your various listening rooms at the same time.

Say you have a Sonos CONNECT hooked up to input 1 and you're listening to Paul Simon's Graceland on Spotify®. You can have one, two, three, or all four zones play Graceland. Let's say you also have a CD player hooked up to input 2. Two zones can jam to Paul Simon, while the other two play a CD.

Each zone also has a dedicated pair of RCA inputs for playing a "local" source in that room only.

...and outputs

Want to expand your multi-room system? Use the RCA outputs to feed audio signals to an additional amp of your choice.

Multiple power-on options

The '508 can be turned on manually, or automatically when it detects a source. It's also 12-volt trigger compatible, so you can have it turn on when another piece of equipment is fired up.

Precise volume control for each zone

Each zone of the AD508 has individual volume control for the left and right channels, giving you precise control over your system. If you have a big room that needs more volume to get to your preferred listening level, you won't blast music in the other zones when you turn up the master volume knob on your preamp. 

Rear-mounted bass and treble controls provide tone adjustments.

Product Highlights:

  • 8-channel amplifier with 4 independent playback zones
  • play the same source through all 4 zones, or have a different source play in each one
  • 65 watts x 8 into 8 ohms at 0.2% THD
  • 100 watts x 8 into 4 ohms
  • 200 watts x 4 bridged into 8 ohms (at 1 kHz)
  • high-efficiency switching amplifier design
  • Over Temperature Protection (OTP) gently reduces power if temperature gets too high, avoiding shutoff
  • Over Current Protection (OCP) differentiates between a direct short and a dynamically low speaker impedance
  • optical digital input for connecting a TV, CD player, or network streaming device
  • rear-panel bass and treble controls
  • rear-mounted, independent level controls for each channel
  • Bus 1 and Bus 2 RCA inputs can be assigned to any channel so that different sources are available for each zone
    • each pair of bus inputs has a corresponding output that can be daisy-chained to another amplifier
  • discrete pairs of "local" RCA inputs for each zone
  • Phoenix-style speaker connectors
  • three power-on modes (normal, signal-sensing, trigger)
  • infrared remote control included
  • rack-mountable with included hardware
    • two-rack spaces high (3.5" tall without feet)
  • frequency response: 20-20,000 Hz
  • signal-to-noise ratio: 100 dB
  • 16-3/4"W x 4"H x 16-5/8"D
  • weight: 32.4 lbs.
  • warranty: 2 years
  • Our 60-day money-back guarantee

What's in the Box:

  • 8-Channel/4-Zone power amplifier
  • 6' AC power cord
  • Remote control (CR2025 3V battery installed)
  • 8 Phoenix-style connectors (pre-installed)
  • 2 Rack-mount brackets
  • 4 Short screws
  • 4 Long screws
  • Owner's Manual

You use it for my outdoor speaker zone powering 6 pairs of speakers. Have it attached to my Denon 9.2 receiver with Heos

Steven, Rochester, MI


AudioSource AD508 Reviews

Average Customer Review(s):

(4 Reviews)

Nice amp for price

John from Highlands Ranch, CO on 10/19/2018

Crutchfield Customer Review (What's this?)

I used this amplifier to drive 3 other sets of speakers off of my zone 2 of my marantz sr6012. It seems to do the job. I wish the controls were on the front however. It does have a remote at least to increase or decrease the gain value. I had trouble with auto trigger type feature so I just activate it from the switch in front. So it works as i thought it would but 4 stars since controls in back.

Pros: Decent sound and power

Cons: Controls in back

AudioSource AD508

Steven from Rochester, MI on 7/30/2018

Crutchfield Customer Review (What's this?)

You use it for my outdoor speaker zone powering 6 pairs of speakers. Have it attached to my Denon 9.2 receiver with Heos



Great Multi zone Amp

Carlos from Hayward, CA on 6/12/2018

Crutchfield Customer Review (What's this?)

Love the amp. It works like expected and enough power for AW6500 outdoor speakers. Definitely recommend this amp for zone options!



AudioSource AD 508

John from Stewartsville, NJ on 4/6/2018

Crutchfield Customer Review (What's this?)

Very nice amp going to be nice addition to my whole house system. My Crutchfield rep Shawn did a great job putting all the equipment I needed together.

Pros: Easy set up.



Hands-on research

Product Research


AudioSource AD Series: AudioSource AD series digital amplifiers are designed for home and commercial audio distribution systems where high quality sound, flexibility, and reliability are essential. The AD series offers high efficiency and exclusive features that will make their installation and use easy and convenient.

8-Channel Power Amplifier: The AudioSource AD508 is an 8-channel amplifier that is designed for distributed audio applications. The amplifier can be configured for Stereo (4-ohm minimum) or Bridged (8-ohm minimum) output.

  • Stereo (8-ohm): 65 watts x 8 channel @ 20-20kHz with <0.2 THD+N
  • Stereo (4-ohm): 100 watts x 8 channel @ 20-20kHz with <0.2 THD+N
  • Bridged Mono (8-ohm): 200 watts x 4 channel @ 1kHz with <0.2 THD+N

4 Zones: The AD508 can distribute audio to 4 Zones. You can configure the amplifier to play the same source input (Bus 1/Bus 2) in each Zone, group source inputs (Bus 1/Bus 2) in specific Zones, or have different sources (Line In 1-8) playing in each Zone. Each Zone can consist of one pair of stereo speaker, two speakers in mono, or one Bridged-mono speaker. Each Zone also has independent level control.

Bus Line Inputs & Outputs: The AD508 has two "common" or Bus inputs that receive audio signals from standard line-level audio sources and sends them to any or all channels and zone. The two pair of Bus line outputs are direct feed-through to allow the Bus inputs to be fed to other amplifiers.

  • Bus Level Controls: Each Bus has its own independent level adjustment. This allows the output level of each Bus to be adjusted to make up for different source levels, or to group two different source's volume levels. The Bus Level Control can be operated from the rear-panel or remote control in 1dB increments.
  • Bus Bass & Treble Controls: Bass (100Hz) & Treble (10kHz) can be adjusted (from -12 to +12B) independently for Bus 1 and Bus 2.

Optical Digital Input: The AudioSource AD508 also features an optical (toslink) digital input that is assigned to Bus 1. This digital input only support 2ch PCM (not compatible with Dolby Digital or DTS).

Individual Channel Input: In addition to the Bus line inputs & Optical digital input, the AD508 offers a dedicated input for each of the eight output channels, so you can have a discrete source playing through each connected speaker.

Phoenix-Style Speaker Outputs: The AD508 uses high-quality Phoenix-style connectors for each speaker output (1-8). The Phoenix-style connectors can accept 14-18 gauge speaker wire. There are two sets of Phoenix-style connectors in each Zone (1-4), so you can connect two speakers in stereo, two speakers in mono, or one speaker in Bridged-mono in each Zone.

  • Source Selection: Each output channel (1-8) is capable of delivering source audio from on of 3 inputs - Bus 1, Bus 2, or Line In. You can choose to play the same source or different sources from each output channel.
  • Gain Control: Each output channel (1-8) has its own independent level adjustment. This allows the output level of each speaker to be perfectly matched to its area. It can also be used to limit the maximum audio level in a certain area.

IR Remote: The included IR remote provides wireless operation of the power amplifier. Remote functions consists of Power On/Off, Bus 1 Volume Up/Down, Bus 2 Volume Up/Down, and Mute.

Trigger Input/Output: The AD508 is outfitted with a trigger input and output, each consisting of a 3.5mm minijack terminal. The 3.5mm trigger input will accept a 3-30V AC/DC output from another electronic component device to turn the amplifier On from Standby mode. The A508 also provides a 3.5mm trigger output (12V/500mA) to turn on and off another electronic component device.

Detachable AC Power Cord: The AD508 comes with a detachable 6' AC power cord which will need to be plugged into an AC wall outlet, surge protector, or power conditioner.

Mounting Options: The AudioSource AD508 power amplifier features four heavy-duty feet and can simply be placed on top of a flat surface; like a table-top, shelf, or stand. You can also remove the four feet and rack-mount the amplifier using the included rack-mount ears and screws.

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 verify what’s in the box, 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.

Q & A

Customer Q&A

Crutchfield asked  
Why did you buy this?

I need an amp with enough power to drive my 3 other zones outside the main zone. This fit the need i was looking for. the reviews for this seemed good so i went with it as it was recommended by my crutchfield advisor. i did check out others but i couldnt find one that fit this feature set at this price point. [ john  Sep 24, 2018 ]