How to use the OEM amp Wiring - Page 4 - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

DNAPoPo · 08-21-2013, 08:46 PM

Quote:

Originally Posted by RandomHero

Easiest route: Buy an amp with High Level inputs

Slightly more advanced:
A line output converter. Because its a full signal you can use it on speakers or a sub with appropriate crossover points. Only problem is the "Sub" volume control on whatever headunit you are running will have no effect. You would have to boost the lower frequencies yourself, which is often possible on line converters (many have built in eq's) or your HU.

:happy0180:

One last question, the amps I have in mind do speaker level inputs, would I be tapping into wires (A) or (B)?

(A)
White = LF Speaker amplified out (black line means -) [PIN 1 and 5]
Grey = RF Speaker amplified out (black line means -) [ PIN 2 and 6]

(B)
Green = Left speaker signal input from HU [PIN 3 and 9]
Purple = Right Speaker signal in from HU [PIN 4 and 10]

mid_life_crisis · 08-22-2013, 10:17 AM

Not knowing if (B) is amplified from the HU or line level (probably amplified), I would try (B) first. If it doesn't produce any real volume, you haven't hurt anything. You can always still connect (A) with the gains down and see what happens if (B) isn't loud enough.

f0rge · 08-22-2013, 10:24 AM

You definitely want to tap (B), I use (B) for the speaker level inputs on my amp. (A) is the powered signal going to the door speakers.

(B) is coming from the HU, (A) has been "amped" by the factory trunk amp and no one is really sure if that amp has any crossovers or filters or other sound shaping built in.

RandomHero · 08-22-2013, 01:17 PM

Quote:

Originally Posted by DNAPoPo

One last question, the amps I have in mind do speaker level inputs, would I be tapping into wires (A) or (B)?

(A)
White = LF Speaker amplified out (black line means -) [PIN 1 and 5]
Grey = RF Speaker amplified out (black line means -) [ PIN 2 and 6]

(B)
Green = Left speaker signal input from HU [PIN 3 and 9]
Purple = Right Speaker signal in from HU [PIN 4 and 10]

Use B as inputs. @f0rge is correct. The white and grey wires will now be powered by your aftermarket Amp as these wires go directly to your door speakers (ie no filter exists between this harness and the door so set your HPF and LPF on your amp as you desire)

DNAPoPo · 08-22-2013, 04:19 PM

Quote:

Originally Posted by RandomHero

Use B as inputs. @f0rge is correct. The white and grey wires will now be powered by your aftermarket Amp as these wires go directly to your door speakers (ie no filter exists between this harness and the door so set your HPF and LPF on your amp as you desire)

Ther I go lying about last questions... Hopefully last question pin 3&4 correspond to white wire on speaker RCA connection or red?

kuhlka · 08-22-2013, 04:41 PM

I'll just do a YouTube video tonight showing my setup. I recently moved my wires from the HU to the amp and it works fine. I'm using posi-taps.

Sigh-on-Rice · 08-22-2013, 07:13 PM

Quote:

Originally Posted by DNAPoPo

Did you use the speaker outputs or HU signal to wire to your sub amp?

I was thinking to take these below and convert to RCA and use as sub output from HU, since BRZ HU does not have RCA out, will this work?

Green = Left speaker signal input from HU [PIN 3 and 9]
Purple = Right Speaker signal in from HU [PIN 4 and 10]

Sorry, I was sick and didn't check the forum for a while.
It's already been answered and f0rge explained it well.
I used signal wires. PIN 3, 4, 9, 10.

BRZnut · 08-22-2013, 08:19 PM

Quote:

Originally Posted by kuhlka

I'll just do a YouTube video tonight showing my setup. I recently moved my wires from the HU to the amp and it works fine. I'm using posi-taps.

Looking forward to seeing it!

kuhlka · 08-22-2013, 09:10 PM

[ame]http://youtu.be/ma5s8GLOd7w[/ame]

kuhlka · 08-22-2013, 09:11 PM

I'll do better videos after I move. I have garbage lighting in my dinky garage. Where I'm moving I'll have access to a full pneumatic lift and TONS of tools.

BRZnut · 08-24-2013, 03:21 PM

Thanks for the video..doesn't look too bad to do

kuhlka · 08-27-2013, 12:41 AM

Quote:

Originally Posted by BRZnut

Thanks for the video..doesn't look too bad to do

The only annoying part is running the positive lead. I'll flop my back seat down, get a shop light, and do a better video when I'm all moved next weekend. I still need to shorten some of the wires and eventually get a custom enclosure for the driver's side corner.

mmontes · 08-28-2013, 01:57 PM

:happy0180: this post helped my life in so many ways!

Chase Bays · 08-29-2013, 12:48 PM

I will be using this write up to install an AMP for my speakers and sub. I'll take some pictures to share.

Perks of the job: My battery is in the back. (May need to upgrade the size haha)

08-22-2013, 10:17 AM	#44
mid_life_crisis Senior Member Join Date: May 2013 Drives: FR-S 10 #103 AT Location: NC Posts: 1,519 Thanks: 101 Thanked 599 Times in 347 Posts Mentioned: 5 Post(s) Tagged: 0 Thread(s)	Not knowing if (B) is amplified from the HU or line level (probably amplified), I would try (B) first. If it doesn't produce any real volume, you haven't hurt anything. You can always still connect (A) with the gains down and see what happens if (B) isn't loud enough. __________________ Necessity may be the mother of Invention but Desperation is quite often the father. “Sex is like Bridge. If you don't have a good partner, you'd better have a good hand.” - Mae West Papa said, "son there's a lot of evil temptations out there. Best to try 'em all so you know which ones to avoid."

08-29-2013, 12:48 PM	#56
Chase Bays Join Date: Oct 2012 Drives: FR-S \| 335i \| S13 Location: Birmingham, AL Posts: 290 Thanks: 85 Thanked 232 Times in 122 Posts Mentioned: 15 Post(s) Tagged: 0 Thread(s)	I will be using this write up to install an AMP for my speakers and sub. I'll take some pictures to share. Perks of the job: My battery is in the back. (May need to upgrade the size haha) __________________ Chase Bays FR-S

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BRZnut Senior Member Join Date: Oct 2012 Drives: BRZ DGM Limited Location: USA Posts: 1,237 Thanks: 5 Thanked 431 Times in 250 Posts Mentioned: 8 Post(s) Tagged: 0 Thread(s)	Thanks for the video..doesn't look too bad to do

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