Recone & enclosure modifications... it's getting closer to my goal


shredder2

Oldmang
Nov 19, 2017
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251
Az
Well... reconing to dual 1 was something I wanted to do. Waiting for about a month for the recone to arrive was something I should have expected... thx Fi
Then due to the added power I had some enclosure surgery to do. 7.6ft3 then to 7.1ft3... finally around 6.7ft3 seems to be where I need it. I've closed up the port area a bit to 111in2 and kept the tuning close (around 42hz... best guess I got). I removed my preamp/eq and set gains a little better (DD1 and all). I had to get assistance with the reconing as my hands lack strength and fine motor movement skills but it got done.
I think I'm getting closer to my goal and will meter it soon. After the recone I blew my dustcap loose and now it's mufugly with CA but solid after fixing the issue.
At .5 nominal I sure need more current but it IS a difference for sure. Not setting records here or anything but for a daily single 18?.. :)
I've never made an enclosure last so long or go thru so many changes... lol... this one started at 9.07ft3, then I cut it down to 7.6ft3, added bracing/45's to take it around 7.1ft3 and is now around 6.7ft3/42hz after more bracing/45's and doubling up the inner port wall.
I got that smaller Northstar I can still add as well but nowhere to put it in back realistically so I might try to locate it up front eventually (good luck charlie).
At least the enclosure is well braced now... lol
 
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shredder2

shredder2

Oldmang
Nov 19, 2017
2,341
251
Az
I've closed-up the port area to 105in2 and am going to shrink the net volume by .25-.35ft3 as I'm still able to overpower the sub seemingly.
At full out I can make the coil tap slightly (frequency dependent) so I think I'm close to where I need to be volume-wise at least.
With only a few burps testing, that small port area change did make a real difference, so I'm hoping the volume change will let me use all the power. This AAK-4000.1 is pretty strong at .5.
I'm very happy as is but looking for more as usual...🤣
 
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shredder2

shredder2

Oldmang
Nov 19, 2017
2,341
251
Az
I got to shrink volume some more, it should raise tuning a touch right where I need it, I cant even burp at cabin frequency as is... what I metered was just under 47hz (cabin freq) at 45hz.
I've got this to play with soon...


For now I'm sticking with the Bl and trying to get some more DB's out of it 1st before changing up.
I'm trying a - .5ft3 change for now. I about sent that BL at the event... i think the last .1db was the coil tapping.
 
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shredder2

shredder2

Oldmang
Nov 19, 2017
2,341
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I replaced the crispy 0ga Soundquest alt charge wire earlier today with a Toolmaker dual lug and dual 1/0 copper welding wire. Found another ground that was powdery as well and got busy under the hood for once. I ended up changing the battery terminals (ILL customs) and any Cca I could find. I am waiting on lugs and wire to finish the main run and amp area then I'll double up all grounds up front with copper as well.
Now to resize this box so I can burp at cabin frequency without killing the sub and see if 151db+ comes. I won't rebuild this setup for this sub so it's just test and test. I kinda shot myself in the foot, I can't with play around with positioning only change the distance to the loading surface. It's in there and not getting moved so I'll just see what I can get out of it now.
Jeez... look at all this nonsense... blue, yellow and green needs to be added to close up volume. The tan, pink and purple is already previously done.

I remeasured and ran some #'s and I'm around 7.1ft3 net tuned 39hz or so currently.. with the change in volume I should be around 6.5ft3 net tuned just under 41hz. Hopefully that will allow the sub to handle the power better... there's another event in Oct locally coming up. I'll probably fart a 45 on that day... lol
 
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shredder2

shredder2

Oldmang
Nov 19, 2017
2,341
251
Az
Well... I changed the enclosure net volume for my BL-18 by -.5ft3 and if it gained I cannot tell. I'm still getting that sound at 44hz and above. I'm throwing darts at this point... lol. This is uncharted territory for me, I suppose I might be asking more from my sub than it's got possibly... idk... I'm clamping well above rated (3000+) and even with the additional spider it's possible it is well past the limits. I'll try another -.5ft3 change... my tuning will be around 42.5hz then so if this won't let me burp at cabin frequency (47hz) I think I've passed the subs mechanical limits. Everytime I downsize the box it lowers the impedance around tuning so I might negate the changes with additional power anyways. It looks like .5 rising to 1.4 if I go .5ft3 less on volume but hell... I'm gonna find out...
😂

 
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shredder2

shredder2

Oldmang
Nov 19, 2017
2,341
251
Az
The volume change has worked, I still coil tap around cabin frequency but am able to get closer to 47hz than before. I'm hoping another .5ft3 might get me there. With the volume/tuning change I'll probably clamp more power at that frequency (47hz) so I might be chasing my tail... we'll see.
The coil tap starts at 44hz now instead of before the change at 42hz... from a 150.8db to 151.51db with only a small volume (.5ft3) change and consequent tuning change has me wondering if I might get lucky and break 152db with another identical change.
Testing, testing... but it's getting hard to shrink the enclosure anymore so I will have to be creative.
 
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shredder2

shredder2

Oldmang
Nov 19, 2017
2,341
251
Az
So you don't actually listen to music? Just tones?
Omg... it's a daily... of course. I just change levels and x-over points for metering.
Who listens to tones only?.. I meter it with tones, listen to mainly old school rock/metal and some old school rap but really anything. I do try to avoid "whale song" at full volume... I kinda want this sub to last long enough to sell eventually after the Platinum 18 gets installed, For now I'm chasing numbers with the same enclosure and having fun doing it trying to maximize db's.
 
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