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Trail Can Directions

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6.5” Trail Can Assembly Instructions

If you want to paint your enclosures, we have had great results with Krylon’s Fusion line of spray paint that is specifically designed for adhering to plastic.  They have many colors available, or if you desire to use specific color of paint to match your vehicle Krylon has a Fusion Primer.

It’s best to disassemble your cans prior to painting and follow the direction on the paint can.

1.  Your speaker enclosures should have arrived with the speaker mounting flange attached for strength in shipping.  It may make assembly a little easier to remove the mounting flange(4 Phillips head screws) and sit it aside for now.

2.  If you ordered your speaker enclosures without speakers, you will need to crimp on appropriate female spade terminals, to the wiring pigtails, for the speakers you plan to run.

3.  Next, take two of the gold wiring terminals(1 red striped and 1 black) and unscrew the caps.  If you would like, you can place a small amount of RTV around the holes.  Insert them into the holes on top of the speaker enclosures, then place the ring terminal of the appropriate speaker wire over the stud inside the can, then the gold lock washer and nut.

Using a small screwdriver or awl inserted in the hole in the top of the wiring terminal, to hold it in place, tighten the nuts inside with a 9/32” socket.

Do not over tighten; just snug the flat base to the top of the can

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4. Take the time to consider how, and at what angle, your cans will be mounted to your vehicle.  You can run a small bead of RTV around the bolt on the bottom of the octagonal washer if you’d like. 






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5.  Take your clamps, with the octagonal locating washer, and insert them into the large hole on top of the can with the clamp indexed the desired direction.  Then place the washer, lock washer, and wing nut inside; and tighten firmly by hand.







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6.  If you want to, run a small bead of RTV just inside the lip of the enclosure.









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7.  Lay the can on a table and sit the speaker mounting flange in place and snug down with a Phillips screwdriver(by hand).  Wipe off excess RTV(if applied).









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8.  Considering how the enclosure will be mounted to the vehicle, lay the speaker in the enclosure with it oriented to the horizon(this is purely cosmetic).  If the speaker has a separate grill, place it over the speaker and use it to center the speaker.  Then mark the speakers screw holes with a fine tipped, white or silver marker(something you can see).






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9.  The size of screws of speakers may vary.  So, take a small drill bit(probably start with 7/64”) and drill pilot holes where you marked. If it’s too difficult to hand screw into those hole open them up to 1/8”. 

NOTE:  Before screwing down the speaker connect the pigtails to the speakers.  Be sure that the red terminal’s wire is connected to the positive terminal on the speaker and the black to negative.




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DO NOT use a power screwdriver to avoid stripping out the plastic of the mounting flange.  Be careful not to stab the speaker cone.






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10.  When your speakers are mounted securely to the vehicle, insert the stripped ends of the speaker wire(coming from your source) into the hole of the appropriate terminal and tighten down the cap firmly by hand.





Amplifier Wiring


  • If running your speakers off an amplifier, make sure you use the appropriate sized power and ground wires.
  • Decide where your amp will be mounted.  Even marine grade amplifiers should not be submerged, so higher mounting points are recommended if you will encounter deep water.
  • Connect the power wire directly to the battery.  It is best to have your fuse within 18” from the battery.
  • DO NOT insert the fuse until all your wiring and mounting is complete.

If using a midi fuse and holder purchased on our site, the below picture show how to connect it to the power wire.

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Our fuse holders take a 3/16” allen wrench.

With the fuse holder completely assembled,  pop the base off and attach it with self tapping screws to a safe location away from moving parts and exhaust.

It’s best to keep your ground wire as short as you can(less than a 2’ is ideal).  Connect the ground wire to the vehicle with a ring terminal to an existing bolt(seat frame bolts work) or use a self tapping screw.  Just make sure it’s attached to something that grounded.  You may have to remove some paint around where the ring terminal contacts the body.

A small amount of dielectric grease around connections can prevent corrosion.

The remote wire coming from your amp can be 18 gauge.  This wire turns the amplifier on.  It will need to be connected to a 12v source that is hot when the ignition is on, or to a switch.

Make sure you consider the polarity as you run speaker wire from your amplifier to your enclosures.  Keep positive to positive and negative to negative.

On higher-powered speaker 16 gauge wire is recommend.  Marine speaker wire is not required, but will last longer without corrosion; especially in humid or salty environments.

If your are using a CD player/head unit for your amp’s source, run an RCA cable from the amplifier’s input to the output of the head unit.

If directly connecting to an MP3 player or phone, use a 3.5mm(headphone) to RCA adapter or an adapter for your specific device to RCA.  Connect to the amplifier’s RCA input.

If you are using an inline gain(volume) controller.  Run a male to male RCA audio cable from the amp’s input to the output of the gain controller.  Then attach the RCA source adapter to the gain controllers input.  Mount the gain controller in a convenient location when tightly strapped into your vehicle.

Adjusting Your Amplifier

Once everything is wired up, and your fuse is installed. 

Set the amps cross-over to High Pass or Full.  You can play with these settings to see what gives you the desired sound.

You can adjust the amplifiers cross over to match the range of the speakers you will be using, but you may wish to fine tune it by ear.

Turn the gain on the amplifier all the way down.  Then set whatever you will adjust your volume with(CD player, remote gain controller, or MP3 player) to around ¾ of maximum volume.  Then, with your favorite tunes playing, start turning the gain on the amp up until you get distortion and then back it off slightly.


Thank You For Purchasing Our OCX Trail Cans


for installation and assembly questions please email us at info@crawltunes.com



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