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Tyler R's 2007 Subaru Impreza

Great sound and trunk space

Tyler R. from Standish, ME, thought it was very important to have an abundance of trunk space in his 2007 Subaru Impreza. But he also wanted powerful sound, which brought him to Crutchfield. First he pulled out the floor of his trunk, then designed a fiberglass enclosure to hold two 12" subwoofers, an amplifier, and a capacitor that would fit in the space.

Tyler R's 2007 Subaru Impreza

Tyler and his 2007 Subaru Impreza with a boomin' new system that fits in his trunk without sacrificing valuable real estate.

"I enjoy the challenge of rewiring and upgrading my car," says Tyler, and he had a big job in front of him, with two pairs of speakers, two subs, an amp, a capacitor, and a portable GPS unit to install. He's always been a Kenwood fan (they've "never let me down," he says), so he went with Kenwood speakers for the front and rear doors, plus a pair  Kenwood 12" shallow-mount subs that would fit into his custom box, but still allow for plenty of accurate bass.

Items installed:

Adding the subs

Tyler built the fiberglass sub box to fit perfectly in the floor of his Impreza's trunk and sit flush with the seats when folded down. He used some speaker accessories from Crutchfield, like the box speaker terminals and polyester fiber stuffing to help round out his project.

Tyler R 2007 Subaru Impreza with empty custom sub box

After adding some carpet from Crutchfield to match his trunk's interior, Tyler was able to install his subs, amp, and capacitor. He went with a 5-channel amplifier to save on space since he was also adding two sets of speakers. The placement of the box would allow the heat from the amp to vent into the spare tire well.

Tyler R 2007 Subaru Impreza

Speaker challenges

Tyler wanted to use the same speakers for the front and rear doors, but the Kenwood components he ordered were going to require some modifications to the vehicle to make them fit in the rear doors. He had to cut each rear door speaker opening to the desired 6.5 inches, but then the speakers were too deep for the doors to fit. Tyler made custom MDF speaker mounts to hold the speakers in the rear doors, then drilled the speaker grilles directly to the door's interior surface. Luckily the front door speakers were easier to install, as you can see here:

Tyler R's 2007 Subaru Impreza - front door speaker

For the tweeters, Tyler drilled into the car's A-pillar and C-pillar and mounted them where they would deliver the most efficient sound.

Tyler R's 2007 Subaru Impreza - Kenwood tweeter mounted on door pillar

Adding the GPS and more wiring

Tyler wanted to keep his new Garmin portable navigator with its 5" display handy without cluttering up his windshield, so he invested in a mount and adapter plate from Pro.Fit to secure the Garmin to his dash. He also spliced the Garmin's power cable into the rear of the 12-volt power port in his dash so he could keep the navigator charged, his power cables hidden, and have his port free for other portables, like a cell phone or MP3 player.

Tyler R's 2007 Subaru Impreza - Kenwood stereo and Garmin nuvi portable navigator

Tyler also ran a cable from the aux input in the rear of the head unit to the center console which would allow any passenger in the car with a portable MP3 player to access the stereo. He also ran the stereo's rear USB input cord to the glove compartment where he has an iPod® stashed. Here's a look at Tyler's Subaru Impreza with all his new gear installed and the sub/amp/capacitor enclosure covered up for safety:

Tyler R's 2007 Subaru Impreza - final installation shot

Up next for Tyler: adding some sound damping material to reduce the rattles in his car and make it sound even better.

Vehicles in the Custom Car Showroom are submitted by customers and fans, and edited by Crutchfield writing staff. You can find more of these articles on the Showroom main page.

  • mike from Seaford

    Posted on 2/17/2021

    how did you build this need help

    Commenter image

    Dominic DeVito from Crutchfield

    on 2/22/2021

    Hi Mike - It's not terribly likely that Tyler will see this comment and walk you through how to build a custom fiberglass enclosure, but I can recommend this article as a possible starting point for considerations you'll need to take into account for a sub box build. Remember: fiberglass is going to be quite more expensive than wood/MDF. If you need further help for working with fiberglass, there are many tutorials available online.
  • Christopher C Verton from Albion

    Posted on 9/18/2018

    I have the same car in wx blue...but..I was able to fit 2 big boy sound qubed 10s in a 4cui box on 3000 watts..and Infiniti kappa components in all doors..the catch with door speakers with big magnets is to use at least a half inch spacer ring between speaker and door panel to prevent the window assembly from hitting the mag. Otherwise..they are sound stage canvases with amazing potential.

  • Garret O'Dell from St Mary's

    Posted on 3/27/2018

    Tyler, if you see this it would be great if we could get in touch, I have the same car as you and would like to do something similar

  • Steve

    Posted on 11/25/2015

    Hats off to Tyler. I wish I had his expertise and temerity to address the poor sound quality of my Impreza!

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