Bose’s Solution For Big Bass Sound In The FD Mazda RX-7 Looked Disturbingly Like Your Guts

Rx7 Baseguts
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Recently, our own now-recovering Jason Torchinsky wrote a little bit about his near-death experience with very graphic medical illustrations of what happened, as well as a rather too-graphic written description of loss of control of his lower gastrointestinal system. The above image would appear to be a continuation of Torch’s story but is, in fact, not a human body part and instead an automobile component.

Starting in the late eighties, car manufacturers were all about that bass- the best way to translate that 808-generated sound into your vehicle. Bose started with the system used in the C4 Corvette, which was used almost verbatim in other General Motors luxury cars (and our 1990 Z32, which included a “center channel” below the head unit). The Bass Wars was officially on, with JBL getting into the mix with systems like the one in my crappy 200,000 mile Town Car which actually sounded like some dude in the trunk with a baseball bat against the rear seat back. Bose could not sit on their laurels.

For home use, Bose had developed something called the Acoustic Wave “Bass Cannon” which sounds at first like something designed to shoot fish great distances but is in fact a long tube that Bose discovered would be the best way to deliver maximum ground pounding.

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Bose

This is a cool idea, but somehow a giant tube like that was not going to work in a car, especially a small car like the FD Mazda RX-7 that Bose was tasked with making a sound system for in the early nineties.

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The solution Bose came up with was the same as how the human body deals with twenty-something feet of small intestines and five feet of large intestine; a twisted, convoluted tubing shape that snaked around the inside edge of the RX-7’s cargo space. The shape created the equivalent length of the bass cannon, though it did still take up a lot of trunk space and, jeez, just look at it.

Fd Rx7 Back 2
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In fact, it looked EXACTLY like a human colon if we’re being honest.

Intestine Image 12 26
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There are holes in the rear cargo cover when this Loch Ness monster pokes its heads to give you bass mechanics the thump you need. Googly eyes would look good mounted on the ends.

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Honestly, most low frequency fans took a simpler approach and just mounted foot-and-a-half diameter Cerwin Vega subs into fiberboard boxes where the rear seats would be on foreign market models and let that do the trick. That’s what I would have done back in the day- wouldn’t you?

Sorry, I couldn’t catch your answer; I’ve been having problems with my hearing recently. I’n not sure what’s caused this.

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59 thoughts on “Bose’s Solution For Big Bass Sound In The FD Mazda RX-7 Looked Disturbingly Like Your Guts

  1. As the article mentions, I feel like it would have been a lot easier and just as effective to just put a shaped sub enclosure in the package shelf cubbies where the rear seats were in the JDM FD3S. I did basically exactly that in my C4 (a car that is about the same size and probably has even less room in it) when I ripped all of the Bose stuff out of it and it sounds far better and doesn’t take up half of its main cargo area.

  2. I learned to get better with my carpentry building subwoofer boxes for my 89 XJ and my 99 Tacoma. Fun times. I now have a permanent tweeter in my ears called Tinnitus.

  3. Circus Warp used to have a massive pile of bass cannons they’d made out of, uhhh, ‘liberated’ yellow gas main pipes and woofer cones that they’d have in a big jumbled stack out front of their sound system at parties back in the day. Some of these things were 10 feet long and 2 feet wide and they packed a punch, alright. Aaaaah, the 90s…

  4. Obviously the thing to listen to in the RX-7 are Borborygmus recordings.
    By the way, it is truly remarkable how many bands are named Borborygmus or Borbetomagus , anyway any of the Borborygmi on this.

  5. It may be intrusive, but it is still better than what they did on my peterbilt. I have a 12 inch sub in the cargo compartment under the bed in the sleeper. Not only does it take up valuable room for tools and fluids, but the only way you hear bass from it is if you are laying in bed. And if I am in bed, I’m not listening to music. So yeah, at least the mazda bose has a reason to exist.

  6. This remeinds me of something similar but different. Didnt one car have special tubing running from the intake to the firewall to enhance engine sounds?Maybe one of the Miata models?

    1. I think they’re far from the only car that has it, but you’re probably thinking of the sound tube on some trims of ND Miata. It runs from the intake to the firewall and a fair number of people remove them either because they don’t like the sound or Miata owners being Miata owners, “weight-savings”.

      I still have mine, but every so often I think of at least disconnecting it to see if I can hear a difference. (you have to get a different fitting at the engine end though)

      1. The exact opposite of a sound enhancement from an mx5 is what bmw crammed into my r53. If I count correctly the intake on my mini makes 3 90* turns and 1 180* before it makes it to the filter, then another 180 through the filter followed by another 90 and a 45 before it gets to the throttle body.

        All of that to quiet the intake and supercharger sounds. It makes the r53 one of the few cars that a cold air intake kit actually does what it says on the box because it replaces all of that with a box that takes air from the high pressure in front of the windshield (the mini is terrible aerodynamically so that is a very high pressure spot) and puts it through a filter then a single simple turn straight into the throttle body. Much better sound, and an actually measurable increase in power.

    2. I believe you’re referencing the ‘noise pipe’ that VW added to the 2.0T Mk5 GTI to try to ‘enhance’ the sound, since it was ahem, ‘a bit’ disappointing compared to the VR6.

  7. This is it. Irrefutable evidence that the mysterious anonymous car designer known as The Bishop and Jason Torchinsky are one and the same person. The clues have been accumulating:

    * cold starts somehow uninterrupted in spite of Jason’s incident
    * references to body parts and/or functions in articles
    * broad and deep knowledge of automotive design arcana
    * Jason’s slow descent into madness due to lead acid battery dust inhalation

    Wake up, people!!1!

    1. I have believed for a while that Torch and the Bishop are the same person. However , he references owning a 1990s Nissan 300zx and a Lincoln Town Car. Neither of these are air cooled VWs or Chinese mobility scooters with roofs and doors. It cannot be the Torch.

        1. Multiple personality disorder… Personalities are the same, only the cars are different. 🙂 Let’s ask David if he ever saw them in a room together

      1. Don’t forget the 420SEL and the two BMW wagons currently still in the Autopian motor pool; pure kryptonite to Jason. Also, know the fact that I’m about to go to the garage to get into a vehicle that JT described as a “big lumbering idiot mobile”.

        Then again, wouldn’t this be a perfect cover to lead you off the trail to the truth that The Bishop doesn’t really exist? He claims to do this for fun. He supposedly feeds automotive arcana to the site that even Jason was unaware of. Yeah, and there was a unicorn ordering Burger King in the drive-thru in front of you as well, right?

  8. Years ago I had to do some disassembly on the back of one of my husband’s FDs. Basically to get to the relocated battery you have to disassemble a crap ton of the back. I was totally wondering what all was going on with that stuff ????

  9. I remember seeing these in the showroom back in the day and the sales guys were definitely showing off the Bose guts in the trunk and the holes drilled into the pedals for lightness. They both seemed futuristic back in the early 90s.

  10. Had a single 10″ JL sub in a narrow angle box behind the drivers seat in my standard cab S10 in high school and it was damn near perfect.

    Years later in a 94 Cherokee I found a 10″ box from subthump that went in the useless cargo cubby on the right side of the trunk.

    Both seemed less intrusive and more useful than this.

    1. I felt the same way. The system in the Z32 (which was very similar to the one in the C4 Vette) sounded good but took up no extra space.

      I remember back in the day there was a sub that fit into the void of the wheel of the spare tire that seemed like a great idea on the surface at least.

    2. As I mentioned above I had an 18″ ported JBL sub out of a movie theatre. That was quite obtrusive. It took up the entire cargo area of my XJ.

      I eventually woke up and replaced that monstrosity with a 10″ Infinity driver mounted into my spare tire adapted as an acoustic suspension box. It actually worked quite well. With the spare cover on it was undetectable and took up no room. It took a bit to disassemble but the spare was still usable as a spare should the need arise.

      I like your solution better though.

    1. Not surprised. I was in the audio/video industry in the 2000s. It was the insiders joke on how Bose stuff sounded like shit, but they did a hell of a job marketing it. Consumers who didn’t know the difference would be enthralled by the performance of Bose speakers, when they were generally marginal, at best.

        1. I learned how to solder when I had to replace the capacitors on all five of the Bose units in the Z32; they all eventually died. Unsuccessful on one so had to send to CorvetteAmps.com or something for a fix.

        1. Yep. They always had goofy marketing shit like “Waveguide”. Uh huh. Everyone else just calls that ported. The stuff that really mattered like driver quality, amplifier power etc. wasn’t mentioned. The worst offender was Monster Cable. I feel like the rest of the industry held them in grudging respect for how incredibly ridiculous they managed to market their over priced wire and have consumers go for it. We tried to distribute another brand called Ixos and realized the hard way that Monster had like 90+% of the wire market through aggressive and successful marketing. Consumers knew one thing when it came to wire, Monster. Otherwise they’d look at cables like they simply wouldn’t work. Amazing.

    1. I’ve never seen that, but I know that the pretty 929 that Mazda introduced the same year as this RX-7 had a Bose system that took up like half of the useable trunk space.

  11. Honestly not a bad design IMO.

    Meanwhile, in my Prius v I just have a tiny subwoofer (Infinity Basslink Mini) under the passenger seat, and I’m planning to give it a mate under the driver’s seat…basically the only useless available spaces left in the car.

    I don’t know why (especially because I don’t consider myself an audiophile), but I much prefer the sound of bass coming from dedicated woofers rather than the door speakers.
    The door speakers are otherwise stock and I think it sounds nicer split up that way.

    1. I just miss having a sedan with a trunk. The under-seat subs work OK but even a pair of Sparkomatic 6x9s in the rear package tray pumped by a Kraco head unit from KMart back in the day could produce bowel-shaking (excuse the pun related to the article) bass.

      1. Sparko made some surprisingly good 6x9s that could really take some abuse and pump up the jam. I had a really cheap 300w Class D attached to a pair back in the ’80s that would truly crank without breaking up. Rear deck of a ’70s GM A-Body. Good times.

    1. Not so much anymore. However, our two current cars (bought used) have a Mark Levinson and a Bose system respectively, which I sought out when buying them. I still listen to it too loud, more out of necessity now.

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