4 HDC3 18s C pillar below window line SPL help - Car Audio Classifieds!
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Old 04-19-2016, 05:44 AM
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Default 4 HDC3 18s C pillar below window line SPL help

Below i'll list the box specs with torres box calc. Its Tester box just to see how my car reacts with each tuning and port area. I will be changing out the ports to either a big slot or an octoport.



Power is an ampere TFE 8.0 at half ohm.

Pic of the box atm. It was 17 inches away from the hatch but now its 9 inches away from the hatch.



Here's the results

With all 5 open at 43.5hz tuning 16 port per cube, It felt like the subs were free air. Very low output all around even in the higher notes. This was supposed to be the burp configuration.

With 4 open at 40hz, 13 port per cube, feels like the same issue, just weak output all around like above.

3 open at 36.5hz is the best out of all of them. 19-60hz bandwidth, very flat with great SQ however output is still only around 149-150 db. peaking very low 29-42hz

2 open at 31.5hz just made the 19hz to 32hz area get more impact but lost top end impact. Zero port noise even at 19hz-30hz

So far only basic deadening and 1/2 plywood on the roof with the vehicle

Goal is to be 155 db below window line C pillar by the end of this year. Along with peaking 30-50hz.

My old setup with two DC level 5 18s in the D pillar up fire on less power was just as loud and peaked a lot higher with less bandwidth. I'm thinking of making a box extension and making a slot port up fire again to see if that will make things peak higher. I would GLADLY trade off anything below 30hz for much stronger 30-50hz performance.

Any suggestions are welcomed


video of my HDC3s playing 22hz

https://www.youtube.com/watch?v=rSwrq6oWtmQ
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09 sienna B pillar 6th order with 4 team ascendant 18s on two taramps 15ks
320 amp singer alt, 6 group 31 agms in the back (battery revamp in the works)
80 prs, 3 way front with head unit + amp crossovers, massive ct 2 german silk tweets, pwx 10s in the doors, PRVs 6mr500 ndy in the kick on ct 500.2 to the pwx 10s, ppi 900.4 bridged to prvs, ppi 600.2 to the tweeters.

Last edited by jeffdachef; 04-19-2016 at 05:55 AM.
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Old 04-19-2016, 06:33 AM
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Shlt the struggle is real!!!! Lol I had hell of a time getting non wall loud with 4 18s... I ended up with like 18cubes tuned to 32hz with like 180-200" of port. Loudest I got was 152.xx on music at 37hz on 1 8k... I have different vehicle and woofers then you but I started at like 22cubes and ended up at like 18 cubes.
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Old 04-19-2016, 08:56 AM
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closer to the hatch. and tune higher and use hatch as extenetion of port
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Sometimes I just want to drive my shit into a shop and hand them a fistful of money and be like... "Here. Do this shit."
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Old 04-24-2016, 04:16 PM
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Quote:
Originally Posted by djscrubb View Post
closer to the hatch. and tune higher and use hatch as extenetion of port
I tried but after a certain point i dont really gain anymore. Its at the loudest positioning from the hatch atm.
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09 sienna B pillar 6th order with 4 team ascendant 18s on two taramps 15ks
320 amp singer alt, 6 group 31 agms in the back (battery revamp in the works)
80 prs, 3 way front with head unit + amp crossovers, massive ct 2 german silk tweets, pwx 10s in the doors, PRVs 6mr500 ndy in the kick on ct 500.2 to the pwx 10s, ppi 900.4 bridged to prvs, ppi 600.2 to the tweeters.
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