AX-DSP Programmable EQ

This Article Will Explain How to Quickly Get up and Running with the New AX-DSP EQ.


The AX-DSP Is Available for Purchase Here.

Follow this guide and you will be up and running fast without missing out on any of the cool features that the AX-DSP offers. The best thing about the AX-DSP is that it performs some very techy feats without being overly complicated. This article assumes that you will be using the AX-DSP with a '14 & up Harley and are retaining the factory radio. The AX-DSP is also capable of working with any radio including aftermarket radios. The key is to understand the basic jargon and a few basic concepts. So here we go!

Install the Free App

The App that controls the DSP is free and available in both the Google Play as well as the Itunes store.  

Don't Worry about Connecting to Your Computer.

The AX-DSP has a USB port on it for updating the firmware but as of the writing of this article there are no reasons to use the USB port or ever connect to a PC. All of the settings will be done via Bluetooth with your smartphone or tablet. 

Don't worry about selecting a vehicle in the app or obtaining a vehicle T harness. none of this applies to Harley applications. Leave the vehicle selection blank. 

Make the Connections

The AX-DSP is designed to work with a lot of different vehicles (cars). On a Harley you will not be using a lot of the wires in the input harness. 

Identify the input harness and the output harness. The output harness hass only RCAs and a remote wire (Blue/White). 

On the Input harness you will not be using the following wires. 

  • Blue/Pink
  • Black/Yellow
  • Orange
  • Pink
  • Brown

Unused wires

Insulate these and tie them off so that they are separated from the wires that we will be using. 

The wires that we will need to use are as follows. 

  • Yellow = Constant Battery Power. Connect directly to an amplifier positive power terminal or run directly to the battery (fuse it!). 
  • Black = Battery Ground. Do not ground this wire to the frame. Connect it directly to an amplifier negative power terminal or run it directly to the battery. 
  • Red = Accessory power. Run this to an accessory circuit on the bike. This will be a circuit that goes to 12V when the bike is in accessory or the run position. The cigarette lighter circuit is a good place to tag this connection
  • Blue/White = Remote output. This goes to your amplifiers to turn them on whenever the AX-DSP is on. This wire is located in the output harness. 

RCA Input Connections for '14 & Up Bikes with Factory Radio

AX-Dsp RCA Input

The DSP has 6 channels of RCA signal input and 6 channels of RCA output. If your bike is only setup from Harley for two speakers, and you plan on using more than two speakers, then you will use a set of RCA Y adapters and an American Hard Bag Plug & Play signal harness. The plug and play signal harness will plug into the factory radio harness on one end and then plug into the RCA Y adapters on the other end. Then those Y adapters will plug into the front and rear RCA inputs of the DSP. 

If your bike is flashed for 4 speakers or came with 4 or more speakers from Harley, then you will be using both front and rear American Hard Bag plug & play signal harnesses to plug directly into the DSP and no Y adapters will be required. 

The subwoofer RCA inputs will never be used with a '14 & up Factory radio. The subwoofer signal input can be set within the DSP app to be taken from the front or front/rear inputs. This makes connection to the Subwoofer RCAs on the DSP unnecessary.  


All of the Settings Are Done with Your Smartphone or Tablet.

Here is the beauty of this DSP. The interface is very straightforward and does not take long to set. 

Step 1.

 Step 1

 Start by powering up your DSP and connecting to your tablet or phone by Bluetooth. This is done from within the App and not from your devices Bluetooth settings. Tap on the "Bluetooth Connection" button (White Hand). 

The DSP should show up in the "Nearby Devices menu" (Blue Hand). Once You are connected you can run a quick test by tapping the "Identify" button in the configuration menu (Red Hand). This will send a quiet "ding-ding" sound through the front left speaker. This will verify that the DSP is connected properly and functioning. 

Lock It Down!

Notice the "Lock Down" button in the configuration menu. Tapping this button saves all of your settings to the DSP directly. Be aware that there is also another button further down in the configuration menu that is labeled "Save Configuration" (Blue Hand in Next Pic). do not confuse this button with the Lock Down button. The "Save Configuration" feature saves your current settings to your tablet or phone and not the DSP. The DSP can only hold one configuration at a time. Your device (tablet or phone) on the other hand can save many, and those saved profiles can be instantly uploaded to your DSP at any time. 

Vehicle Type

Do not select a vehicle type. This feature of the AX-DSP does not apply to Harley Davidson applications. You will not need a vehicle T harness either. The only harness that you will need is the '14 & up Harley signal harnesses that we sell as an option for the AX-DSP. These harnesses will plug directly into your bike for audio signal. There are three harness options.

  1. Front signal adapter. This harness obtains front signal from the factory radio and also comes with a new set of harnesses to go from your front speaker pods to your new aftermarket amplifier. 
  2. Rear signal adapter. This harness obtains rear signal from the factory radio. If using this harness, your radio will need to be flashed for 4 speaker operation. 
  3. Ultra specific signal adapter. This is a T harness that connects to the tour pack connector under the seat to tag both rear audio signal as well as rear speaker input and reroutes these connections to the front of the bike. 

 Second screenshot Axxess AX-DSP

 Selecting Inputs


Select if you would like for the subwoofer to be derived from a combination of front + rear or directly from the subwoofer input RCAs. Generally you want to select "front + rear" since Harley Davidson radios do not have a dedicated subwoofer output.

Input Level Select 

This is where you select if you will be using high level or low level signal input. Set all three of these to "High" when using a factory Harley radio. 

Amp Turn On

Here you have the option to select when the AX-DSP will send a signal out to your aftermarket amplifiers to turn them on. You have the option "Always On" or Signal Sense". "Always On" is the recommended setting. This will give you a definite amplifier on status whenever the bike is on, where as the signal sense option will only turn on the amplifiers when music has been sensed at the RCA inputs. This can sometimes be problematic. 

Note: The "Always On" name can be somewhat misleading. Always on actually means that the amplifier remote out will always be on as long as the AX-DSP is seeing that the bike is in the run or accessory state. So, if the bike is on, your amps are on. 

3rd Screenshot Axxess AX-DSP

Delay Adjust

Delay adjust is for advanced users only and is not generally necessary in a Harley application. The quick rundown here is that this feature allows you to add delay to a speaker that you select so that that speaker sounds like it is farther away from the listener. Using this tool you can make the speakers that are closer to you sound as if they are the same distance from you as the speakers that are farther from you (bag speakers). When done right, this can make the bag speakers compliment the fairing speakers in such a way that it sounds like all of the sound is coming from the front. Left and right delay should always be the same since you sit right in the center of left and right speakers. 


The levels menu allows you to set how much radio distortion the DSP will allow to pass to your amplifiers. This is a genius feature that mutes the output of the DSP temporarily when distortion is detected in order to warn you. This will potentially save your speakers from going up in smoke!  Use this feature to aid you in adjusting your amplifier gain levels. You can read more about setting amplifier gain levels here. 

Chime Level

This feature is not used in Harley applications.