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Old 11-26-2012, 01:27 PM   #1
GreyFixer
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Default Sound Ordnance B-8PT underseat sub installed into my 2013 Impreza Sport (non-WRX/STi)

Hereís a walk-through on how to install an underseat sub.

I have a post on replacing the head unit here: http://forums.nasioc.com/forums/show....php?t=2430330


First, I prepped the wires by connecting the terminals and heat shrinking the connections. I also put some heat shrink near the fuse holder to make everything look better once the install is finished.



I didnít have wire terminals small enough to connect to the inputs so I had to modify larger ones to fit.






Next, I removed the four bolts connecting the seat to the car and tilted the seat back to have room to work. Note: these bolts SUCK to remove.




Test fit. Make sure to set it as close to the center console as possible.



Now to start running the wires. I started by removing the upper rubber grommet on the firewall on the driverís side. (Sorry I didnít take a before picture of this but you can see where Iím talking about in later photos.) I cut a small hole in the grommet and put the smaller grommet from the wiring kit it the middle.

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Old 11-26-2012, 01:28 PM   #2
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DO NOT CONNECT THE POWER WIRE AT THIS TIME!!! That will be the last step!


I ran the power wire through the grommet and began routing it through the firewall by pushing it down and to the right until it finally comes out under the dash.






I pulled out the slack in the wire and routed it over to the passenger side where it was joined by the RCA cables and remote turn-on lead from the head unit.



I pulled back the carpet from the center console and cut a small gash for the wires to go through.




I connected the ground wire to a bolt on the floor below the seat. I know this is not the best ground but I donít want to drill any holes.
Now I cut the wires to length and routed them under the center console and out through the hole I cut earlier.




Now I attached the terminals, covered the wires with sheathing, and covered the ends with heat-shrink tubing. I should mention that the wires are not as visible through the sheathing in real life. The camera flash just makes it look that way.
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Old 11-26-2012, 01:28 PM   #3
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Now the wires are connected to the amp and the seat can be bolted back in place.





To finish off the wiring, I started wrapping the power wire with the plastic looming all the way up to the firewall. I even found a nice clip to attach the fuse holder to.





Then I just connected the wire to the terminal block and put everything back in place.




Here is the finished product. It shouldnít look like anything is there.



And finally the sub under the seat.
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Old 12-12-2012, 11:44 PM   #4
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Thanks for the write up. I'm picking up one of these for Christmas.
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Old 12-12-2012, 11:58 PM   #5
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Very nice and clean install. Any reason for choosing the passenger side over the driver side?
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Old 12-13-2012, 10:01 AM   #6
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Quote:
Originally Posted by RacEoHolic330 View Post
Very nice and clean install. Any reason for choosing the passenger side over the driver side?
Do you want to feel that vibration on your butt while driving and listening to music? lol.
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Old 12-13-2012, 10:45 AM   #7
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Excellent post, I'll be installing my B-8PT in my 2013 STI this weekend. It's not the same but close enough to be extremely helpful. Thank you for the pictures.

Quick question - did you bolt the subwoofer down to anything or is it just sitting on the floor?

edit: Ooh, I just found what I think is an ideal solution, at least for mounting my amp, and maybe also the subwoofer - slide thin plywood under the carpet and screw the amp into it, through the carpet! Brilliant!

Last edited by Mephiska; 12-13-2012 at 11:03 AM. Reason: added a link
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Old 12-13-2012, 01:55 PM   #8
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Mephiska, Velcro would be easier.

It's what I use to mount my amp, she hasn't moved an inch with all my crazy driving.


Buy at Amazon or Big box store.
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Old 12-13-2012, 03:54 PM   #9
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Quote:
Originally Posted by Mike 01Hawk View Post
Mephiska, Velcro would be easier.

It's what I use to mount my amp, she hasn't moved an inch with all my crazy driving.


Buy at Amazon or Big box store.
You my friend is a genius!!! I've been thinking of ways to put my amp in the car without drilling through it. Completely there's a thing call velcro lol. Been thinking about double sided tapes or those foam tape thing but I know those don't hold on to fabric very well. Ahhhh sometime it's better to think stuff a bit more simple so you can see all the options.

Question: How do you attach velcro to the carpet? Are you somehow having one on the carpet and one on the amp or do you just use the one rough side on the amp and have it cling to the carpet? (found out that's what people has been doing to mount amp on carpet =D)

Last edited by luan87us; 12-13-2012 at 04:13 PM.
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Old 12-13-2012, 04:36 PM   #10
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Correct, I'm just using the Velcro hook side. A little really does go a long though. I'm using foot long strips on both sides of my amp (attached to wood trim I sprayed with flat black, which were then mounted to the amp with nuts/bolts thru the amp's stock mounting holes). It's complete overkill and will probably screw up my stock carpet trunk floor if I'm not careful whenever I do need to remove the amp.

For a sub like that under the seat, I'm sure just a couple patches hot glued to the sub would be more than enough.
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Old 12-13-2012, 05:19 PM   #11
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@GreyFixer this is awesome!! I'm saving this for future reference. I have a cople of questions:

Did you replace the stock speakers and tweeters? And how's the sound of the sub overall?

I have the Nav unit and I'm not planing to replace it but I would like to add a sub down the road. I know Subaru offers one, but it looks more like an overpriced, space problem afterthought. Is there a way to connect a sub like this to the factory nav (since you can connect the Subaru sub I guess the answer is yes, but what kind of connector should I use)?

And one last question, Is the cable on the 7th pic the cable for the heated seats and seat belt? I thought it would be impossible to add and under seat sub because this cable was in the middle, but you have proved me wrong.

Cheers!!
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Old 12-13-2012, 05:30 PM   #12
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Quote:
Originally Posted by Mike 01Hawk View Post
Correct, I'm just using the Velcro hook side. A little really does go a long though. I'm using foot long strips on both sides of my amp (attached to wood trim I sprayed with flat black, which were then mounted to the amp with nuts/bolts thru the amp's stock mounting holes). It's complete overkill and will probably screw up my stock carpet trunk floor if I'm not careful whenever I do need to remove the amp.

For a sub like that under the seat, I'm sure just a couple patches hot glued to the sub would be more than enough.
I'll be using velcro only to attach an amp half the size of your to the back of that smaller rear seat lol.
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Old 12-22-2012, 08:38 AM   #13
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Mine just arrived from crutchfield! Merry Christmas to me.
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Old 01-09-2013, 12:31 AM   #14
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Going to install SO B-8PT in a week or two in 2012 WRX Premium, so thanks much to GreyFixer for the detailed pics. And the install looks very clean! Nice!

A couple of questions and comments.

Questions:
1. GreyFixer, with the sub mounted "sideways" (which looks great for the wire runs) how did you dial in (tune) the amp? It seems in this orientation that manipulating the gain, crossover, etc. would be hard? I haven't put my sub underseat yet, so I'm just guessing at this point. But if adding new H/U, speakers, etc., you would need to have easy access for sound stage tuning.
2. Was the grommet you found through the fire wall a spare? Looks like it.
3. Where did you remount the B-8PT's supplied remote control knob?

Comment(s):
1. Velcro's "Industrial" from HD or other is so strong that it will often peel off from the sticky side (attached to component) before peeling from the hook and loop side. I use it a lot on my motos (helmet bluetooth wiring, underseat wiring) and it holds up well. I have an Alpine Amp in my WRX attached with Velcro and I can hardly remove it from the carpeting.

Last edited by calisubie; 01-09-2013 at 12:36 AM. Reason: missing info
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Old 01-09-2013, 01:46 PM   #15
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Quote:
Originally Posted by calisubie View Post
Going to install SO B-8PT in a week or two in 2012 WRX Premium, so thanks much to GreyFixer for the detailed pics. And the install looks very clean! Nice!

A couple of questions and comments.

Questions:
1. GreyFixer, with the sub mounted "sideways" (which looks great for the wire runs) how did you dial in (tune) the amp? It seems in this orientation that manipulating the gain, crossover, etc. would be hard? I haven't put my sub underseat yet, so I'm just guessing at this point. But if adding new H/U, speakers, etc., you would need to have easy access for sound stage tuning.
2. Was the grommet you found through the fire wall a spare? Looks like it.
3. Where did you remount the B-8PT's supplied remote control knob?

Comment(s):
1. Velcro's "Industrial" from HD or other is so strong that it will often peel off from the sticky side (attached to component) before peeling from the hook and loop side. I use it a lot on my motos (helmet bluetooth wiring, underseat wiring) and it holds up well. I have an Alpine Amp in my WRX attached with Velcro and I can hardly remove it from the carpeting.
1. I did the initial settings while the seat was still raised. For later adjustments, I can slide my hand under the seat on the side closest to the door and adjust the knobs from there. It's a tight fit but it's doable. I leave everything flat except for the gain so I really only adjust that.

2. Yes. It was a spare grommet blocking an unused factory hole.

3. I don't use the remote knob. I just set the gain and control everything else from the head unit.

Last edited by GreyFixer; 01-09-2013 at 02:20 PM.
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Old 01-09-2013, 02:17 PM   #16
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Quote:
Originally Posted by ICE_NY View Post
@GreyFixer this is awesome!! I'm saving this for future reference. I have a cople of questions:

Did you replace the stock speakers and tweeters? And how's the sound of the sub overall?

I have the Nav unit and I'm not planing to replace it but I would like to add a sub down the road. I know Subaru offers one, but it looks more like an overpriced, space problem afterthought. Is there a way to connect a sub like this to the factory nav (since you can connect the Subaru sub I guess the answer is yes, but what kind of connector should I use)?

And one last question, Is the cable on the 7th pic the cable for the heated seats and seat belt? I thought it would be impossible to add and under seat sub because this cable was in the middle, but you have proved me wrong.

Cheers!!

I replaced the door speakers with a set of Polk Audio db651s, which are outstanding for the price. I didn't replace the rear speakers because the adapters I bought don't fit the rear doors. The sub sounds OK. It's much better now that it's been broken in but it doesn't work miracles. It's still an 8-inch driver in a small sealed enclosure with a modestly powered amplifier so it just can't physically reproduce the low end bass that you would get from a larger driver. It's more of a mid-bass than a subwoofer. Your satisfaction would kinda depend on what genre of music you listen to. I listen to mostly rock so it's fine for what I use it for but someone who listens to rap or dubstep may be underwhelmed.

As far as adding a sub to the factory head unit, you could use a "breakout" harness from SVXdc: http://ae64.com/20-pincombinedharness.htm. You'd probably be better off with replacing the head unit to get better sound overall though.

Yes. It stays out of the way.
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Old 01-09-2013, 04:45 PM   #17
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This is super clean! good job.
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Old 01-18-2013, 04:25 PM   #18
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Question Thanks for an excellent write-up.

This is very well documented: great job!

Does the OP or other reader have any opinion about any potential change in the sound quality caused by not attaching the box firmly to the floor? Would it sound better, the same, or worse if it were anchored to the shell of the car body? Or perhaps soft mounted (rubber biscuits?) onto the floor pan?

Regards,
Sig
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Old 01-18-2013, 05:29 PM   #19
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Quote:
Originally Posted by Sigmoid View Post
This is very well documented: great job!

Does the OP or other reader have any opinion about any potential change in the sound quality caused by not attaching the box firmly to the floor? Would it sound better, the same, or worse if it were anchored to the shell of the car body? Or perhaps soft mounted (rubber biscuits?) onto the floor pan?

Regards,
Sig
It wouldn't make a difference.
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Old 04-12-2013, 08:45 AM   #20
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Do you think you could fit a 10 inch low profile powered sub under the seat?
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Old 04-12-2013, 10:01 AM   #21
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Do you think you could fit a 10 inch low profile powered sub under the seat?
Most definitely not. At that point you would be better off putting an amp under the seat and running the speaker wires to a subwoofer in the rear and just removing it any time you need the extra room. If I could go back and do it again, that is what I would do instead of getting an under-seat sub.
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Old 04-12-2013, 10:14 AM   #22
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do you think one might be able to run the wires to the sub under the carpet?
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Old 04-12-2013, 10:22 AM   #23
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Quote:
Originally Posted by GreyFixer View Post
Most definitely not. At that point you would be better off putting an amp under the seat and running the speaker wires to a subwoofer in the rear and just removing it any time you need the extra room. If I could go back and do it again, that is what I would do instead of getting an under-seat sub.
You can, the hard part is done. Just swap your sub out for an amp, and run some speaker wire to the back for a sub. I'm sure someone will by the S/O, they seem to be popular around here.
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Old 04-12-2013, 10:24 AM   #24
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Quote:
Originally Posted by goregasm View Post
do you think one might be able to run the wires to the sub under the carpet?
They are under the carpet. Thats why he cut the small hole in the carpet under the seat, so they pop out where no one will see them.

Honestly, you should talk to a local installer.
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Old 04-12-2013, 12:33 PM   #25
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Nice write-up. Good clear steps with lots of pictures. I don't have one of these cars, but it should be nice and helpful for those who do. Thumbs up!
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