Phoenix Gold Oz Posted September 14, 2012 Author Report Share Posted September 14, 2012 Hi All, It's been awhile since we last updated this build log, but there hasn't been a lot of significant changes since the last updates. As many of you have heard/seen the Astra does some decent numbers with a Pb of 152.1dB at 32Hz (on music) but more impressively we also do a 151.7dB at 22Hz on music as well. The 'issues' we've been having with the box has all been linked to the shape of the centre chamber. Basically we didn't make the angle of the baffles steep enough, so there is too much airspace at the back of the box and not enough at the front. What that means is that most of our pressure is actually going to the back of the box. In testing we put the Termlab meter on a broomstick and moved it around the box and vehicle. We used a 30Hz tone and found that at the back of the box we were doing 161.x dB at 30Hz, but in the port we were only getting 147dB, we would then gain back about 5dB at the dash for a 152.xdB on the dash (our Pb in testing was 153.1dB with driver's door open) What we would like to do is try a different layout / box design to see if we can get rid of 'some' of the cancellation. We haven't decided on a final design yet, but while we do we are pulling out all of the amplifiers, batteries and subwoofers to give everything a thorough once over. The've all been beaten on pretty hard for the last 10 months and we need to see if we broke anything. So here's where we're at... Stay Tuned for more updates this afternoon! Cheers, Scott Link to comment Share on other sites More sharing options...
Scynte Posted September 14, 2012 Report Share Posted September 14, 2012 Holy crap - good to see another Aussie on here! Keen to see what the new box will be.. Link to comment Share on other sites More sharing options...
Endgame Posted September 14, 2012 Report Share Posted September 14, 2012 Wow this lil car is awesome great workmanship,hats off Trust No One Link to comment Share on other sites More sharing options...
armykyle1 Posted September 14, 2012 Report Share Posted September 14, 2012 I like the dem boobies TEAM XS POWERTEAM HEAVY HERTZMy build- http://www.stevemeadedesigns.com/board/topic/194454-e46-bmw-build-pos/#entry2914134youtube- http://www.youtube.com/user/armykyle1big build starting Link to comment Share on other sites More sharing options...
Phoenix Gold Oz Posted September 14, 2012 Author Report Share Posted September 14, 2012 OK a bit more progress this afternoon. We got all the batteries removed as well as all the 5-1/4" speakers and pods... Next step is to remove the B-Pillars and all the Subs. While that's happening Mick has already ordered all the new lighting and has designed the new protection circuit which will shut off all the amps if any amp goes into Thermal Protection. Not that this new box will have the same issues as the old one, but just in case. For those of you that don't know, in the 4th order we had issues with physically tearing subs apart. Basically if a single amp went into protection then those particular 2 subs would not get any power, that mean the other 16 subs that were still playing would basically bash the crap out of the 2 non-powered subs. Anyway Mick's new super-duper circuit will turn off all the amps whenever one goes into protection. No more lying upside down lifting new subs into position LOL! More Next Week! Scott Link to comment Share on other sites More sharing options...
Phoenix Gold Oz Posted September 17, 2012 Author Report Share Posted September 17, 2012 Well yesterday we got all the subwoofers removed, so getting closer to having the car gutted... Tons of fun removing these damn things, especially the top subs, we had put 2x bolts in each sub just incase the screws ever decided to let go, sounded like a good idea at the time, but makes it a pain to remove them LOL!!! Love the shot of all 18 subs in front of the car! A bit more work tonight and all the front stage amps should be removed. Cheers, Scott Link to comment Share on other sites More sharing options...
Kyblack76 Posted September 17, 2012 Report Share Posted September 17, 2012 Awesome,... just flat awesome...... uhhh,.. awesome guys... SMD SUPER SELLER The Burban Build Blazer Build sold Acura trunk build sold Link to comment Share on other sites More sharing options...
vrollin Posted September 18, 2012 Report Share Posted September 18, 2012 Holy shit! Can that poor little astra even move any more!? Thats a lot of gear! Link to comment Share on other sites More sharing options...
quakecitystudio Posted September 18, 2012 Report Share Posted September 18, 2012 Glad you guys are back at it again! Bass Music Producer • Photographer • Graphic Designer -------------- Deep Sector Boom... Link to comment Share on other sites More sharing options...
Phoenix Gold Oz Posted September 20, 2012 Author Report Share Posted September 20, 2012 Hey Guys, Thanks for the great feedback on our build. Sadly there's not too many exciting things to show you yet, we're just stripping everything down at the moment to prep the shell of the box and get it ready to cut out the old baffles. Hopefully within the next couple of weeks we will have everything ready to cut out, so it will actually look like we're doing something. In the meantime we're working out a new lighting system. Mick is working on a new amplifier protection circuit and amplifier status display. Basically one of the issues we would have in the old setup was IF one amp went into thermal protection, then it would stop powering 2 of the subs. That meant there were 16 other subs trying to turn those 2 into passive radiators - and that always ended BADLY! So the circuit that Mick is building will tap into the Protection indicators in each amp, so if any amp shuts down it will then trigger all 9 amps to also turn off for a set time-out period. This should keep us safe, even in the hot Australian Summer! Beyond that it's just testing batteries, looking at amps to see if we killed anything, and looking at cleaning up some of the head-unit / CANbus wiring. So we are doing stuff - it's just BORING stuff LOL!!! Hopefully some pics soon of somethign exciting. Scott Link to comment Share on other sites More sharing options...
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