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skaed Profile
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Date Registered: 01-2009
Location: Rockingham, Western Australia
TOTAL POSTS: 24
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Hidden Amplifiers T30


Hi all

just a quick one to let everyone know what i am currently undertaking, will post pics etc when i get hold of a camera.

At this stage only a rough install of 4ch amp where tool kit is (back left underfloor) and mono block (back right underfloor). To do this i have removed the foam compartments from each side and will need to re-enforce across where the flaps are for structural integrity (will post when i figure this out).

First off involved pieces of ply cut to the amp size for a flat base then remove stud on each side of boot underfloor. ply screwed into floor then amp mounted ontop after being wired. Monoblock (subwoofer amp) was wired with a switch on the remote lead to be able to turn off amp and remove subwoofers by only undoing speaker cable from the box for max boot space when required.

This location will be prone to overheating due to the lack of airflow, to combat this I will be installing a couple of 12V fans to provide airflow to the area.

I have gone down this path to keep the functionality of my exy while enjoying crisp clear tunes, hoping this turns out the way it does in my head (i work with electo-hydraulics so have a very sound electrical knowledge, read diploma) it will hopefully open the door for others to think about.


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Richard X1122
2006 ST-S 40th anniversary, manual

29/Jan/2009, 9:58 pm Link to this post Send Email PM   Send Private Message
 
basshead Profile
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Date Registered: 02-2004
Location: Panania, Sydney
TOTAL POSTS: 2852
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Re: Hidden Amplifiers T30


Richard, I like your ideas.

I hadn't even thought of mounting amplifiers in that space; once you remove the black foam padding, there would be plenty of room to fit amplifiers, and like you said, airflow for cooling might become a problem.

I assusme you're keeping the spare tyre in place? There might be enough room to mount an amp vertically immediately next to the spare tyre, instead of mounting them in the tool trays off to the sides of the spare wheel. I have a small tool-kit plus a 12v work-light on the left side of the spare, and jumper-leads and an air compressor inside the spare wheel well (still with all the black foam packing in place).

I wouldn't be too concerned about cooling - Two points:
1. fans are certainly a good idea, but you need to be removing hot air or drawing-in cool air (or both) rather than just circulating the air within that space.
2. I have had a 12-inch sub and monoblock amp in my work Falcon which has a full-size drawer from the back seats to the tailgate which is about the height of the bottom of the windows in the boot. On top of this drawer is a 32mm-thick plywood panel which I made a 12-inch cut-out for the sub, and the amp was mounted on the ply, next to the sub. The drawer essentially is the sub enclosure, however the sub is probably more closely functioning as free-air due to all the air gaps in the drawer system. To keep it hidden from those prying eyes that walk past, I have made approx 80mm tall "box" (cover) out of scrap ply which sits on top of the 32mm ply, and was painted black to roughly match the grey carpet which was on the 32mm ply. Initially and for some time (1.5yrs?) there were no holes in the cover apart from small gaps at the sides. After getting sick of the rattles and also concerned about airflow (the amp got too hot to touch!) I then made several 1-inch wide slots above the amplifier to assist cooling, and similar slots above the sub cone to assist in allowing sound to get out of the undesigned leaky bandpass-style enclosure it was working in. I then put carpet matching the other carpet on the top of the cover to prevent prying eyes from seeing the amp and sub through the 1-inch wide slots. It worked a treat - less rattles, but I don't know how much cooler the amp runs as I never took any measurements. I suspect the sub cone moves enough air to circulate it around to keep the amp abit cooler...

The point of example 2 above (although not X-Trail specific, and very long-winded) is that you could probably get away without using fans. If you're after sound quality, you'll be able to hear the fans running in the background, which you may not want.

As for a quick-removal setup, I actually mounted the amp on the sub-box in my X-Trail, and used "Anderson" brand (used on fork-lift battery chargers) for the power connections, and much smaller "bullet" style automotive push-connectors for the signal (12 power-on) connection to save having to screw/unscrew every time I wanted to install/remove the box. I should have photos on my webpage (see link in my sig). Having the amp under the floor would mean you'd only need to remove the box (less weight without the amp) and not need to go for the larger Anderson style plug as you'd only be disconnecting speaker wires.

I also contemplated mounting the sub in the boot door but there wasn't enough depth unless I chose shallow-mount subs and/or built the trim panel out considerably. The only other major problem with this method would've been getting the speaker wires to the subs.

I look forward to seeing your photos.


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Rich. X-013(c)
'04 S2 ST Auto. Nudge_roofracks_tow_tints_Lightforce_GME_YokoGeoA/T-S_TBS_bashplate_50mm-spacer-lift
Click here to see >300MB of photos and videos All For His Glory.
29/Jan/2009, 10:56 pm Link to this post Send Email PM   Send Private Message MSN Yahoo Blog
 
skaed Profile
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Date Registered: 01-2009
Location: Rockingham, Western Australia
TOTAL POSTS: 24
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Re: Hidden Amplifiers T30


Thanks for the input its always good to hear other ideas, especially from someone who has been in the business and knows what they are on about

 Fans would be set up as either a push/pull or extraction only (into boot space) as i am aware there is no point of just moving hot air around underneath the panels. I probably could get away with just some slits however im thinking about the longevity of my amps, and with some discreet placement and plumbing of extraction pipes should cut noise down a fair way.

Quick removal of subs involves banana plugs which as you would be aware are done up with "finger screws" on the side of the sub box (can also just be plugged into the top of the same connection if so desired) and so a plug would not be of any great advantage over this set up. This is also why i wired in the on/off switch on the remote for the monoblock so then i only had to remove speaker wires (I did steal the removable sub idea from you though, thanks)

The only thing I am really concerned with is strengthening the area where the black foam has been removed to retain the load carrying capacity of the boot, looks like it will just be a bit of trial and error.

The amps that i am using are out of my last car and as such the 4ch is a touch too long but fits on an angle. Also the amps i am using are too wide to fit next to the spare tyre but would be a very good spot if you had an appropriate amp



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Richard X1122
2006 ST-S 40th anniversary, manual

29/Jan/2009, 11:44 pm Link to this post Send Email PM   Send Private Message
 
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Date Registered: 02-2004
Location: SUTHERLAND, SYDNEY
TOTAL POSTS: 29094
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Re: Hidden Amplifiers T30


Richard,

Both back left and back right compartments have very adequate ventilation in place, there are ventilation outlets there that lead to the outside of the car behind the bumper on the sides. If you remove the foam of those compartments you will see these ventilation points.

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30/Jan/2009, 5:02 am Link to this post Send Private Message MSN Blog
 
ceasar M Profile
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Date Registered: 12-2005
Location: sydney australia
TOTAL POSTS: 97
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Re: Hidden Amplifiers T30


Hi, mine have it under the front passenger seat ,Alpine mono 500watts fit well and plenty air circulation ,for added security I have it covered with the floor mat.have it for a while with no dramas.
Cheers
 Ceasar

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Ti-L 03
Ceasar- X256
Hi Tech dual exhaust,OBA stainless steel extractor,OBA cold air intake with K&N pod filter,7in. monitor with bluetooth ,GPS iGO8,,MP3,MP4.245x40x18
30/Jan/2009, 11:32 am Link to this post Send Email PM   Send Private Message Blog
 
skaed Profile
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Date Registered: 01-2009
Location: Rockingham, Western Australia
TOTAL POSTS: 24
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Re: Hidden Amplifiers T30


thanks guys

 im aware of the ventilation in the sides however this is not adequate for the buildup of heat on a journey of more than an hour

under the seat is something i personally wanted to steer clear of due to personal preference and the fact that people in the back seat tend to kick or rest their feet on them and i really like the idea of completely hidden amps, it also lends well to what im planning to do a bit later on and build custom boxes for the subs, one in each back corner.

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Richard X1122
2006 ST-S 40th anniversary, manual

30/Jan/2009, 5:03 pm Link to this post Send Email PM   Send Private Message
 
skaed Profile
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Date Registered: 01-2009
Location: Rockingham, Western Australia
TOTAL POSTS: 24
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Re: Hidden Amplifiers T30


Image
monoblock back left side
Image
4 channel back right side
Image
monoblock
Image
4ch
Image
full boot shot with the removable box, which can be faced either way

The wiring is not completed hence why it looks so shabby, as i will be pulling the amps in and out while i am fabricating braces for the floor (which i will draw some plans up for others to follow if they so wish)


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Richard X1122
2006 ST-S 40th anniversary, manual

31/Jan/2009, 8:41 pm Link to this post Send Email PM   Send Private Message
 
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Date Registered: 02-2004
Location: Panania, Sydney
TOTAL POSTS: 2852
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Re: Hidden Amplifiers T30


quote:

skaed wrote:

thanks guys

 im aware of the ventilation in the sides however this is not adequate for the buildup of heat on a journey of more than an hour




After looking at the photos, I know you mentioned fans before - were you anticipating on installing one fan over the ventilation flap, sucking the warm air out? That might be enough to extract the heat effectively for such a small area. Having the tool box cover back in place would force the air over the top of the amplifier, too.



---
Rich. X-013(c)
'04 S2 ST Auto. Nudge_roofracks_tow_tints_Lightforce_GME_YokoGeoA/T-S_TBS_bashplate_50mm-spacer-lift
Click here to see >300MB of photos and videos All For His Glory.
1/Feb/2009, 7:27 am Link to this post Send Email PM   Send Private Message MSN Yahoo Blog
 
skaed Profile
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Date Registered: 01-2009
Location: Rockingham, Western Australia
TOTAL POSTS: 24
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Re: Hidden Amplifiers T30


that could be a possibility i hadnt really thought down that line thanks

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Richard X1122
2006 ST-S 40th anniversary, manual

1/Feb/2009, 2:48 pm Link to this post Send Email PM   Send Private Message
 
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Date Registered: 01-2009
TOTAL POSTS: 45
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Re: Hidden Amplifiers T30


wicked thread, great idea, im gonna do that hwen i install my amp this weekend my kenwood has built in cooling fans aswell

great job

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12/Feb/2009, 7:06 am Link to this post Send Email PM   Send Private Message
 


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