12 inch subwoofer in the cargo box with amp in 2008 premium jbl Prius

looks good. how's it sound?

 

wow. lotta work going into that. I've given up and am gonna live with the jbl. its way better than what I had in my (dads) impala with the 8-track...

good write up so far. keep at it!

 

I found a cheap effective and convenient way of adding a sub to the JBL system. I have used a conventional amp mounted in the cargo tray, but instead of making a box for the sub I have used a ported sub used for add on TV surround sound systems.
The amp is as listed below. I have the ED 7800 version (4 x 100 watts)
edgecaraudio.co.uk/manuals/edge_amplifer.pdf
The sub it from a Samsung system and is rated at 100 watts rms and has an impedance of 2 ohms. It is conveniently silver grey in color. It is versatile in that it can be placed in any position or orientation. I have the unit connected via a non reversible connector making it easy to remove if the space is needed. It really does add punch to the missing base from the JBL system even though it it is based on a 7 inch cone. These systems are also made by Sony, Hitachi, and others so old sub units are readily available.








John (Britprius)

 

Where is your ground for the amp? I will be making a similar sub box since that will take up the least amount of space. Thanks!

 

The ground for the amp is at the point where the negative battery cable is fastened to the bodywork "just below the rear light". The positive feed is picked up from the positive battery terminal via a 30 amp fuse. The ready wire is picked up from the JBL amp under the "for us in the UK" drivers seat.
I connected the audio in through 2 10k ohm resistors to each rear speaker circuit again under the drivers seat, but only grounded the screen for the input at the amp end to avoid a ground loop.

John (Britprius)

 

ah. I have yet to even ask as I know its out there somewhere, but I dont have the JBL or nav... Could I splice the RCAs/speaker wire into the rear door speakers to send signal to the sub amp? (I ask as that is how I was recommend to add a better sub to the Ford Raptor, as the higher the volume goes the more the bass gets cut out of the sub...the Hz range of the rear speakers > sub. Since its just a signal wire and not a power wire it doesnt need to be anything of a hefty size.)

 

you can splice into the rear speaker wires for your sub but you'll need a converter unless your sub amp has speaker level inputs.

 

What kind of converter would it require?

 

to convert speaker level power to signal level. crutchfield can hook you up.

 

Nicely done! Do you have the measurements of your box? Looking to somewhat replicate it. Thanks for the PDF guide.

 

Here is a custom sub enclosure I built for the 2004-2009 Prius. Designed for a shallow or standard regular 10" subwoofer. You get the best of both worlds. Loud bass and full function of your cargo room. And yes stay away from Dual and Boss equipment. Its very inexpensive, but also very poorly made.