Adding factory amp/sub to non premium audio car - MR2 Owners Club Message Board
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post #1 of 19 (permalink) Old March 26th, 2018, 01:10 Thread Starter
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Adding factory amp/sub to non premium audio car

I'm about a decade or so late to the party, but hopefully someone can shed some light (maybe this ought to go in the audio section):

Are the factory sub/amp drop in into a non-premium audio car? From what I have searched, the actual storage box in the premium audio car does have a grill for the speaker and has a different lid.

1.) Would one still be able to drop the sub enclosure/housing into the storage box? And from the factory, does it go behind the driver or passenger side?
2.) Are these cars pre-wired for this (i.e. is there a harness somewhere hiding in the non-premium car that would plug into the factory premium audio sub box/amp)
2b.) If so, are they pre-wired for dual sub boxes which I believe were in the 93+ cars

Thanks
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post #2 of 19 (permalink) Old March 26th, 2018, 03:57
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Based on my experience with our NZDM models which are based on the JDM G or the USDM NA the wiring is completely different and they are not prewired for the premium system. There is a lot of wiring that you would need to get the factory system to work and even if you did the system isn't very good at all.

What you are better off doing is recreating the factory system using modern day technology.

But to answer your questions more directly.

1.) Yes you could drop in the factory sub boxes in. All you'd need to do is find the speaker grille which is only cosmetic to make it look like you have a sub in there. You can install both left and right sub boxes but you'd need to find the boxes, lids and clips to do a full install.

2.)No they are not prewired.

3.)Again not prewired for dual subs.

What is best to do is install a head unit, wire it to the front door speakers, then also wire it to the rear side speakers/subs. Add in amps if you want them and place them under the seats.

Personally my car which is a JDM G-Limited with the single sub premium system uses just the head unit to provide power to the speakers. I have bypassed the factory amps but I do run a factory sub in the left side box. I run aftermarket speakers in the doors and run the door speakers in the panels behind the doors. Much better sound that way. No amps inline.
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post #3 of 19 (permalink) Old March 26th, 2018, 10:11
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My 91 turbo non premium audio came with the sub wiring preinstalled. I used that existing harness for a power and remote signal for a slim box that sits on top of the storage box.
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post #4 of 19 (permalink) Old March 26th, 2018, 16:12
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As GDII recommended, you'd be much better off with a modern system. The stock woofer will really not impress you at all and the amplifier is a common failure item. Just go for a stealth aftermarket setup and you'll be much happier.
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post #5 of 19 (permalink) Old March 26th, 2018, 22:51 Thread Starter
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Thanks for the info guys - I'll have to dig around back there and see. I totally get that it is an old system, but I wanted to try and keep the car factory-ish or at least reversible with no splicing etc. One idea would be to use the stock subwoofer system and just upgrade the speaker/use it as a box for an aftermarket set up... It would be to nice to use a potential existing harness/wiring to fabricate something I can plug into and work with like J.harris suggested.

J- I'm guessing you still ran a line-level/pre-amp out from the head unit (or does the factory system have a line-level output in that pre-existing harness).

/\ I hope that makes sense - I'm not an audio guy by any means
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post #6 of 19 (permalink) Old March 28th, 2018, 07:33
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Heya!

I happen to have a spare set of factory subwoofer boxes that I was packaging up to sell on eBay. I bought them before I bought my car which - surprise! - already came with a pair. What people above have said above is sort of true and sort of not. Instead of re-foaming the original speakers, I replaced them with 5 1/4" Polk bass drivers. (ebay dot com/itm/4-ohm-MW-5530-Woofers-5-1-4-Major-Brand-New-Pair-/250715364951[/url]) I have no idea what they sounded like with the original paper drivers, but now they sound pretty darned good! They won't rattle your license plate or blow your hair back, but they're respectable with more punch than you think they should have, and they do not audibly distort. A small Class-D amplifier will easily fit in the original location, but it's a long run from the head unit so be sure to use well-shielded RCA cables.

If you're a bass hound, I'd suggest using the factory subs in conjunction with one of those 8" amplified subwoofers that are designed to go under the seats. (amazon dot com/Sound-Storm-LOPRO8-Amplified-Subwoofer/dp/B0082YUR7M[/url] ) They're a bit too tall to fit under our seats, but will strap down behind the driver's seat, against the firewall and above the factory subwoofer box. I know it might sound odd to have three small subwoofers in such a tiny car, but this way, should you wish to remove the 8" subwoofer for more cargo volume or to store your T-tops on a sunny day, you still have the two small subwoofers to give you partial bass. Again, this setup isn't designed to win any SPL competitions, but it's surprisingly good without intruding too much on precious cabin space or blowing your budget.

I'll hold onto the factory boxes for another day or so, in case you want them. I'm asking $75.00 shipped, and they include the correct speaker grilles, AND they're currently loaded with some 2-way Sony speakers that look to be in great shape. Assuming your front speakers are knackered, I'd move the Sonys to the front doors and fit Polk 5 1/4's in the woofer enclosures.
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post #7 of 19 (permalink) Old March 28th, 2018, 11:06
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Quote:
Originally Posted by Y_chromosome View Post
Heya!

I happen to have a spare set of factory subwoofer boxes that I was packaging up to sell on eBay. I bought them before I bought my car which - surprise! - already came with a pair. What people above have said above is sort of true and sort of not. Instead of re-foaming the original speakers, I replaced them with 5 1/4" Polk bass drivers. (ebay dot com/itm/4-ohm-MW-5530-Woofers-5-1-4-Major-Brand-New-Pair-/250715364951[/url]) I have no idea what they sounded like with the original paper drivers, but now they sound pretty darned good! They won't rattle your license plate or blow your hair back, but they're respectable with more punch than you think they should have, and they do not audibly distort. A small Class-D amplifier will easily fit in the original location, but it's a long run from the head unit so be sure to use well-shielded RCA cables.

If you're a bass hound, I'd suggest using the factory subs in conjunction with one of those 8" amplified subwoofers that are designed to go under the seats. (amazon dot com/Sound-Storm-LOPRO8-Amplified-Subwoofer/dp/B0082YUR7M[/url] ) They're a bit too tall to fit under our seats, but will strap down behind the driver's seat, against the firewall and above the factory subwoofer box. I know it might sound odd to have three small subwoofers in such a tiny car, but this way, should you wish to remove the 8" subwoofer for more cargo volume or to store your T-tops on a sunny day, you still have the two small subwoofers to give you partial bass. Again, this setup isn't designed to win any SPL competitions, but it's surprisingly good without intruding too much on precious cabin space or blowing your budget.

I'll hold onto the factory boxes for another day or so, in case you want them. I'm asking $75.00 shipped, and they include the correct speaker grilles, AND they're currently loaded with some 2-way Sony speakers that look to be in great shape. Assuming your front speakers are knackered, I'd move the Sonys to the front doors and fit Polk 5 1/4's in the woofer enclosures.
I can second this recommendation. My car has the OEM sub enclosure behind the driver's seat (with a tang band 5.52" in it) and a ported 8" behind the passenger seat. It gets pretty loud, and that's how I like it (I have hearing damage in my left ear so I tend to lean more towards bass than treble). Both of them are running on an aftermarket amp and round out the system pretty well.
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post #8 of 19 (permalink) Old March 31st, 2018, 15:42 Thread Starter
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Thanks guys for the info/ideas. I may do something along those lines. Out of curiosity, how does it sound with just the stock woofer replaced and amplified (without a separate powered sub)?

Also I may have accidentally PM'd the wrong person about thee boxes Y_chromosome has available... if so, then sorry about that!
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post #9 of 19 (permalink) Old March 31st, 2018, 15:59
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Quote:
Originally Posted by Rocket3004 View Post
Thanks guys for the info/ideas. I may do something along those lines. Out of curiosity, how does it sound with just the stock woofer replaced and amplified (without a separate powered sub)?

Also I may have accidentally PM'd the wrong person about thee boxes Y_chromosome has available... if so, then sorry about that!
It's better than the stock amplifier by far. That said running in tandem with my 8" blows that out of the water.
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post #10 of 19 (permalink) Old April 1st, 2018, 01:07
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Quote:
Originally Posted by Rocket3004 View Post
Thanks guys for the info/ideas. I may do something along those lines. Out of curiosity, how does it sound with just the stock woofer replaced and amplified (without a separate powered sub)?

Also I may have accidentally PM'd the wrong person about thee boxes Y_chromosome has available... if so, then sorry about that!
I run my stock sub of my 50W x4 head unit only and works pretty well. I have messed around with the fade and balance to isolate it and for a tiny 28 year old paper cone sub it works well enough to add bass to the sound system.
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post #11 of 19 (permalink) Old May 16th, 2018, 22:52 Thread Starter
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Mini update

I poked around behind the drivers side panel and noted these two plugs... I looked at some wiring diagrams and I think one is to plug into the factory amp and the second is to plug into the factory woofer box?

If that’s the case then I’m assuming the 2 wire plug to the speaker doesn’t have any signal going through it as is?

I looked around online and saw some different connector adapters but wanted to know if anyone has any links to make/female adapters for these connectors (the 2 wire which I think is the same connector going to the rear speaker itself). I’m thinking I’ll make a ‘sub harness’ so I can either tap into the line going to the rear speaker and or alternatively use the plug meant for the factory amp to power/feed an aftermarket amp... that way I don’t have to run any more wires and don’t have to cut anything from the factory.

Thanks!
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post #12 of 19 (permalink) Old May 18th, 2018, 21:01
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I have a parts car with the interior and stereo out that has the premium sound. I can take some pics if that'll help. Would sell the amp, sub, speakers and radio as well.
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post #13 of 19 (permalink) Old May 20th, 2018, 15:29
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Large pink and pale green wires are speaker signal wires, red wll be power, pink with blue stripe will be the amp switch (to tell the amp to turn on when the radio/CD/tape is turned on)
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post #14 of 19 (permalink) Old May 20th, 2018, 19:30
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The small two wire would be the one that goes to the sub. The other goes to a small box in the pillar which is the Subwoofer Amplifier. There is another amp above that with 2 plugs that go into it, kind of right behind the speaker. This set up was used from 89-92(REV 1) and Rev 2 used from 93-98 from my research. I'll attach some pics
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post #15 of 19 (permalink) Old November 4th, 2018, 17:48
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Hey all thanks for the great info. I found the subwoofer and amp from a junkyard mr2 and am planning to install into my JDM 92 GT but the harness also has a brown, a black and a smaller red wire. Any ideas what those are for? Thanks.
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post #16 of 19 (permalink) Old November 4th, 2018, 21:11
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My 94 has the Premium Stereo Option ($1305 when new). Never noticed the sub etc behind the seats. Will have to check tomorrow. Anybody have pics?
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post #17 of 19 (permalink) Old August 9th, 2019, 12:34
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I know this is an old thread - but something here got me curious - did only the 93+ come with TWO subs behind the seats?
Were 91/92 only single sub and then a storage box?
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post #18 of 19 (permalink) Old August 9th, 2019, 22:54
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In the US, only the '93+ with premium audio came with 2 subs.
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post #19 of 19 (permalink) Old August 12th, 2019, 14:12 Thread Starter
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To update this thread, I actually put this in, but only on the drivers side so far. For some reason, the actual plug that goes to the speaker that I identified earlier didn't appear to work/send a signal when I plugged my non-amped sub box into it (as someone mentioned earlier, the speaker lines I think are actually on that larger plug) So what I ended up doing is using OEM toyota connectors, I made a "T" harness that plugs into the speaker harness going to the speaker below the quarter window with one end continuing to that speaker and the other end going down to the cubby where the OEM sub box goes and plugs right into the OEM sub box connector. It (along with the rest of the speakers) is currently powered by an Alpine inline-amp that is seamless with the headunit.

Overall it works pretty well, sounds much better but can probably be improved a bit. The aftermarket speakers my OEM sub box came with could probably be swapped out for a better sound.
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