2015 Chevy Sonic/Wall/4 PSI 15's/SA 6K/Active/Arc/CDT/Singer/US Alt/XS

[WalledSonic]

Driving home from Slam, I had a 16 hour drive to think about why I'm not very loud (lol but seriously).  I had only taken a few data points with the IM-SG, but figured it would be good to plot the entire impedance curve of the sub-box system so I could fully understand how and why the impedance varies like it does.

The dark green line is the impedance rise of the system wired to 0.8ohm.  I took values every 1/2 hertz from 15-65Hz, which took a painfully long time with the sensitive dial of the IM-SG.  The faint green line is the power output the amp should make when subjected to the impedance curve of the system.  The takeaway here is that I need a bigger amp!

The bright red line is the system wired to 0.2ohm.  I'm going to make a different thread to discuss this (and possibly other) impedance curves.

[the_garynator]

44 minutes ago, WalledSonic said:

Thanks man, it was good to meet and see your rig.  Funny thing, I was more excited to see everyone else's rigs and to get demos than to show off my own, so I was wandering around most of the time.  Trying to upload pics right now, I'll be posting them to everyone's threads once I get them loaded.

I'll have to get one next time!  And you'll have to get one in my truck again, the added power made things violent big time! 

[WalledSonic]

I also saw a BAD freeway accident on the way home, and realized (again) that when I removed my rear airbags, that disengaged the entire airbag system.

So I measured the resistance of each airbag (2.2ohm each) and bought (5) 2.2ohm resistors on ebay for $1.67.

Some careful custom bends later: 

And BAM, no more airbag light!  Since the airbag system is a 2 wire daisy chained system, it only makes sense to complete the original circuit with the right resistance so that the startup checks can be performed by the BCM.  

[the_garynator]

3 minutes ago, WalledSonic said:

Driving home from Slam, I had a 16 hour drive to think about why I'm not very loud (lol but seriously).  I had only taken a few data points with the IM-SG, but figured it would be good to plot the entire impedance curve of the sub-box system so I could fully understand how and why the impedance varies like it does.

The dark green line is the impedance rise of the system wired to 0.8ohm.  I took values every 1/2 hertz from 15-65Hz, which took a painfully long time with the sensitive dial of the IM-SG.  The faint green line is the power output the amp should make when subjected to the impedance curve of the system.  The takeaway here is that I need a bigger amp!

The bright red line is the system wired to 0.2ohm.  I'm going to make a different thread to discuss this (and possibly other) impedance curves.

This is the kinda shit I like to see!  I've graphed impedance curves in old systems, it's a tedious process but helps a ton in matching coils to your amp.  I have to do this in my truck now, just haven't had time yet lol

[BP1Fanatic]

Where would the airbag light be on the screen? 

[WalledSonic]

47 minutes ago, BP1Fanatic said:

Where would the airbag light be on the screen? 

Exactly, Mr. State Inspector, there's no airbag problem at all... Haha.  It was the 5th dot on the bottom.

[BP1Fanatic]

Lol!

[WalledSonic]

Damn, really wish I wouldve built a driver's side port.  That way I could block of the 4th sub hole and play around with just 3 subs and more box volume.  I dont think I would get good response by removing a sub from a center slot port design like mine.  Life lessons.  

[bsneon98]

man id love to catch up on this but photofuckit is killing the internet with loss of pics lately

nvm im an idiot lmao

[WalledSonic]

Hahaha thanks man.  New build log for anyone that ended up here:

https://www.stevemeadedesigns.com/board/topic/209412-2015-chevy-sonicwall4-15s10klithiumlarge-case-hairpin-us-alts/