Mazda Miata Amplifier: Plug and Play ENA-3Z1 Install on an ND2
A Mazda Miata amplifier upgrade is the quickest way we know to get more out of the factory stereo in an ND2 roadster, and on the 2019 Miata in this video it took us well under an hour. The Miata is quick, nimble and a blast with the top down, but the factory audio runs out of steam the moment you add wind and road noise. That is true even with the Bose package.
Short answer: the Beat-Sonic ENA-3Z1 plug and play amplifier kit for the 2019-2023 ND2 Mazda Miata plugs into one factory connector behind the passenger kick panel. You keep the factory head unit and speakers, you cut no wires, and you get more volume and more depth from the speakers you already have.
Why a Mazda Miata Amplifier Fixes the Weak Factory Sound
The Miata cabin is tiny and it is open to the sky half the time. The factory head unit simply does not send enough clean power to the speakers to compete with that. Turn it up and you get more noise before you get more music. The bass thins out and the detail goes with it.
That is a power problem, not a speaker problem. The ENA-3Z1 sits between the head unit and the speakers and drives them with up to 50 watts per channel across four channels. If you want the background on why extra power changes factory speakers so much, our piece on what an amplifier does for factory speakers walks through it. The whole lineup of vehicle-specific kits lives in our plug and play amplifier collection.
What you do not have to change
- No speaker swap. The factory speakers stay in the doors.
- No new head unit. Your factory screen and controls stay as they are.
- No rewiring. The harness unplugs and plugs back into the factory connector.
Which ND Miata Is This Kit For?
This is the part to get right before you order. The ND Miata came in more than one revision, and it came with and without Bose. The ENA-3Z1 is listed for the 2019-2023 ND2 Miata, with or without Bose. Our car in the video is a 2019.
If you own an earlier or later ND, or you are not sure which audio system you have, email info@beatsonicusa.com with your year and trim before you buy. As we say in the video, we may ask for a photo of your factory connector so we can send you the correct kit. A two minute email saves you a return.
ENA-3Z1 Install, Step by Step
Everything happens on the passenger side footwell. You need a plastic panel removal tool, a 10mm socket and ratchet, and a thick blanket or towel.
1. Pull the passenger door sill
The sill trim lifts straight up. No screws.
2. Protect yourself from the door frame
Once that plastic cover is off, the metal frame edge underneath is sharp. Lay a thick blanket or towel over it before you start working in that area. Your forearms will thank you.
3. Remove the kick panel
The kick panel is held by a single small clip. Wedge your panel tool between the inner and outer part of the clip, pop it, and pull the clip out. Do not lose that clip. Then pull the panel straight toward you. The weather strip will come loose with it, which is normal, because it shares those clips.
4. Unplug the factory connector
The factory connector sits right behind that panel. There is a release tab on top. Push the tab down and pull the connector straight out.
5. Ground first
There is a factory ground point right there. Loosen it with the 10mm socket just far enough to slip the ring terminal from our harness underneath, then tighten it back down. You do not need to remove the bolt completely.
6. Connect the T-harness, male side first
Our harness is a T. One end goes to the factory connector and the other goes to the location you just unplugged it from. Connect the male end into the factory location first. If you do the other side first, you may not have room to work behind the glove box area. It is a tight angle, so take your time and push until you hear and feel the click. Then connect the factory connector to the female side.
7. Plug in the amplifier
Only two connections are left. Gray goes to gray and white goes to white. Push each one in until it clicks.
8. Set the gains, then mount the amp
The amp ships with the gain dials at the 12 o'clock factory default. Settings are below. Once you are happy, use the supplied foam tape to stick the amp into the back corner of the footwell, then zip tie the harness alongside the factory loom or tuck it out of the way.
9. Reassemble
Line the kick panel up with that one clip hole, push the clip back in, refit the weather strip, and press the sill back down.
The Mistake That Costs People a Second Teardown
The female side of the harness has delicate pins. If you push the connectors together at an angle, you can bend or kink a pin, and then a channel or a function goes missing. Line the halves up square and push straight in. Never force it. This is the same lesson we covered in detail in bent pins and other amp install mistakes, and it applies to every plug and play kit we make.
Our Gain Settings on the Miata
The ENA-3Z1 has separate front and rear gain dials. Here is where we left this car:
- Rear: turned all the way up, fully clockwise.
- Front: brought down to about 40 percent, roughly the 10 to 11 o'clock position.
Treat those as a starting point for this particular car, not a rule. Turn the car on, play a song you know well, and adjust by ear at the volume you actually drive at. If you are worried about pushing the factory speakers, read whether an amplifier can damage factory speakers before you go chasing more gain.
Room to Grow: Sub Output and Remote Lead
The ENA-3Z1 has RCA outputs on the amp, so you can add a powered subwoofer or another amplifier later. The harness also carries a remote turn-on lead for that extra sub or amp. We were not using it on this install, so we insulated it with electrical tape and tucked it away. If you do not plan to add a sub, do the same.
Small car, small cabin, open roof: road noise is the other half of the fight. If you want the music to carry further at speed, our sound deadening kits and the post on why factory audio sounds weak at highway speeds explain how the two upgrades work together.
Miata Amp Questions We Get
Does the ENA-3Z1 work on a Miata with Bose?
Yes. The ENA-3Z1 is listed for the 2019-2023 ND2 Mazda Miata with or without Bose. If you are unsure which system or revision you have, email info@beatsonicusa.com before ordering.
Do I need to replace the speakers or the head unit?
No. The kit keeps the factory head unit and the factory speakers. It adds clean power between them.
Where does the amplifier mount?
In the passenger footwell behind the kick panel. The amp is compact, and we stuck it into the back corner with the supplied foam tape so it is out of sight.
How long does the install take?
Our install in the video took well under an hour. It is one factory connector, one ground and two amp plugs.
Can I add a subwoofer later?
Yes. The amp has RCA outputs and the harness includes a remote turn-on lead for a powered sub or another amplifier.
Rather Have Us Do the Miata?
Beat-Sonic USA is based in La Mirada, California, and we install these kits in house, often the same day you roll in. Send our install team a message with your Miata's year and audio system, or keep exploring stereo interface kits and everything else we make.