Change my mind-Ported subs cant touch sealed - Page 6 - AVS Forum | Home Theater Discussions And Reviews
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post #151 of 203 Old 08-13-2019, 01:48 PM
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Originally Posted by Remy.Alexander View Post
Morning,
Sorry I missed some. I showed my wife the alternatives. (JBL) lol this was the first time she has stepped in, She said "I dont want anything that ugly" HAHA. I'll Talk to the wife and see what she wants to do.

Understood.

Also, problem solved! Put these on and pretend they are any subwoofer you want. $2.50 for a solid black, dome dustcap!

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post #152 of 203 Old 08-14-2019, 05:46 PM - Thread Starter
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Well this just happened. 7ply-3/4(23/32) 5million screws and a tone of glue. 2X4 as bracing- Im really pleased with the bracing, the think is a tank. 2"X18.5"X48" slot port un the back of the cab firing up. both sides and top are also heavily screwed into port. 20X20X60 cab- 64 with leg section. using as feet/isolate. later ill fill it with sand or something lol
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post #153 of 203 Old 08-15-2019, 08:15 AM
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Cheese us! I thought you didn't want a big box?!?! haha

What the hell is that big contraption?
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post #154 of 203 Old 08-15-2019, 12:25 PM - Thread Starter
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Originally Posted by lknhomeaudio View Post
Cheese us! I thought you didn't want a big box?!?! haha

What the hell is that big contraption?
I said i didnt want any thing to big like 20s this is 11(ISH) 20X20X60 ported out the top
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post #155 of 203 Old 08-15-2019, 12:41 PM
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Originally Posted by Remy.Alexander View Post
I said i didnt want any thing to big like 20s this is 11(ISH) 20X20X60 ported out the top

Ah, okay. You kept the Dayton 15s?
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post #156 of 203 Old 08-15-2019, 12:46 PM
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Box looks well built! What was the reason for the external double baffle vs internal?


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post #157 of 203 Old 08-15-2019, 12:57 PM - Thread Starter
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Originally Posted by lknhomeaudio View Post
Ah, okay. You kept the Dayton 15s?
Yes for now, I cant afford any upgrades at this time

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Originally Posted by superkyle View Post
Box looks well built! What was the reason for the external double baffle vs internal?


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Not sure why I do that lol - odd now that you mention it
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post #158 of 203 Old 08-15-2019, 01:23 PM
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Soooo,
Quote:
Change my mind-Ported subs cant touch sealed
yet you're building ported cabs


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post #159 of 203 Old 08-15-2019, 01:41 PM
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Originally Posted by johnson636 View Post
This gif is my reaction to seeing the bracing then seeing the baffle already glued down. I wouldn't say woefully underbraced, but not as much of a tank as many builds I've seen.

Also, the external double baffle with a 60" tall 20x20 footprint is alarming. If you can tether it to a stud a the top, I wouldn't hesitate to do it.
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post #160 of 203 Old 08-15-2019, 01:50 PM
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Originally Posted by notfastenough View Post
This gif is my reaction to seeing the bracing then seeing the baffle already glued down. I wouldn't say woefully underbraced, but not as much of a tank as many builds I've seen.

Also, the external double baffle with a 60" tall 20x20 footprint is alarming. If you can tether it to a stud a the top, I wouldn't hesitate to do it.

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post #161 of 203 Old 08-15-2019, 01:52 PM - Thread Starter
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Originally Posted by johnson636 View Post
Soooo, yet you're building ported cabs




Think you're missing a lot of discussions. We have been discussing them, ive been informed the advantages of ported, I built ported but incorrectly so I rebuilt them. cant start this large conversation and not even try
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post #162 of 203 Old 08-15-2019, 01:59 PM
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Quote:
Originally Posted by Remy.Alexander View Post
Think you're missing a lot of discussions.
You can say that, but

Quote:
Originally Posted by Remy.Alexander View Post
I built ported but incorrectly
was my thought all along.

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post #163 of 203 Old 08-15-2019, 02:01 PM - Thread Starter
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Yeah I didnt want to drop to much volume for window bracing. Top is tied into both sides and back- Long port ties sides together etc-- everything is glues and screwed with 3" screws.. Not sure what the rest is about- Seems like you just want to knock everything- Which I guess you can, but rather you keep it to your self
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post #164 of 203 Old 08-15-2019, 02:02 PM - Thread Starter
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You can say that, but


was my thought all along.

Wow, wife not putting out? why are you such a ass hat stfu
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post #165 of 203 Old 08-15-2019, 02:03 PM
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Tune appears to be around 13hz... you gonna run a HPF?
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post #166 of 203 Old 08-15-2019, 02:05 PM - Thread Starter
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Old 6.6 i built incorrectly are small lol. Wife is going to paint and decorate them more. right now im just calling them the evil containers-
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post #167 of 203 Old 08-15-2019, 02:10 PM
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Originally Posted by Remy.Alexander View Post
Wow, wife not putting out? why are you such a ass hat stfu
Wow indeed.

I'm not even sure why you quoted me in response to a comment I didn't even make

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post #168 of 203 Old 08-15-2019, 02:38 PM - Thread Starter
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Tune appears to be around 13hz... you gonna run a HPF?
Yes, Still working out the details. For now I just have it at 16HZ. kids are crazy, and its a family room so its hard to get peace and quite
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post #169 of 203 Old 08-15-2019, 03:30 PM
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Yes, Still working out the details. For now I just have it at 16HZ. kids are crazy, and its a family room so its hard to get peace and quite

Okay, cool. XMAX is 14mm on these subs, but they've been Klippel tested and shown to be safe out to at least 20mm... so you might not even need a HPF. Depends how much power you end up giving it.

You lose 5dB @ 13hz with the HPF set at 16hz.
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post #170 of 203 Old 08-15-2019, 04:17 PM - Thread Starter
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Okay, cool. XMAX is 14mm on these subs, but they've been Klippel tested and shown to be safe out to at least 20mm... so you might not even need a HPF. Depends how much power you end up giving it.

You lose 5dB @ 13hz with the HPF set at 16hz.

Thank ill try that- Im about to pull my hair anyway i dont get this responce. In room No audyssey on, 1/4" from woofer and -20 on avr.
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post #171 of 203 Old 08-15-2019, 04:21 PM - Thread Starter
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and this was MPL- maybe im reading this wrong but doesn't seem correct
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post #172 of 203 Old 08-15-2019, 04:24 PM
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And this is with your new, 11ft box?
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post #173 of 203 Old 08-15-2019, 04:25 PM - Thread Starter
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This is same settings MLP no HPF- Jesus that thing was killing me I followed steps in guide and set postive gain on channels to offset
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post #174 of 203 Old 08-15-2019, 04:33 PM - Thread Starter
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And this is with your new, 11ft box?
yeah with HPF on, at 500w. I took it off and did that other measurement. I after that i dropped to 300W lol just to be safe
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post #175 of 203 Old 08-15-2019, 04:35 PM
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I told you that the HPF would have you down 5dB at 13hz lol... and naturally, it will be even more at frequencies lower than the HPF.

A close-mic sweep of the cone isn't a true representation of total enclosure output, because you're neglecting the port output. Which is at the top of your box.

Do you see the hug dip in the close-mic sweep at 13-14 hz? That's where the tune frequency is, and the port is doing all the work while the cone barely moves.
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post #176 of 203 Old 08-15-2019, 04:43 PM
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To help you understand what's going on a little better, I took your close-mic response of the cone and manually added some close approximations of what the port would be adding, as well as the combined response of the cone and the port.

Green = your sweep of the cone
Black = approximate port addition
Red = combined response of the two

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post #177 of 203 Old 08-15-2019, 05:04 PM
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Originally Posted by Remy.Alexander View Post
and this was MPL- maybe im reading this wrong but doesn't seem correct
Looks like a good start. Use your PEQ to lower those peaks at 20 Hz and 45 Hz. Since you have two subs, first play with delay and phase on the nearest sub.
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post #178 of 203 Old 08-15-2019, 05:05 PM - Thread Starter
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To help you understand what's going on a little better, I took your close-mic response of the cone and manually added some close approximations of what the port would be adding, as well as the combined response of the cone and the port.

Green = your sweep of the cone
Black = approximate port addition
Red = combined response of the two



HAHA that is awesome. Thanks for that illustration. Sometimes dad needs super simple examples. Kids are going ham now and its a few min till bed so im out of time for tinkering. that last sweep was at MLP- lol at cone was dumb. Sofar pretty happy- More so when I can get time to tinker and eq them flatter. Ya like that message in the glue pic
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post #179 of 203 Old 08-15-2019, 05:15 PM
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Quote:
Originally Posted by Remy.Alexander View Post
Yeah I didnt want to drop to much volume for window bracing. Top is tied into both sides and back- Long port ties sides together etc-- everything is glues and screwed with 3" screws.. Not sure what the rest is about- Seems like you just want to knock everything- Which I guess you can, but rather you keep it to your self
Yeah, I was accounting for the rear and front panels getting the port and the cross bracing for the baffle. If the baffle had not been attached and you had asked about bracing, I'm sure there would have been a couple of people call for beefing up the sides (20x60 without port rails or baffle). Again, I don't think critically underbraced, but might benefit from a little bit extra. 3 inch screws will hold seams, but do absolutely nothing for panel resonance which is what the bracing is actually for.

If the second half of your above quoted post was for me, I'm addressing a possible tipping issue. I saw you mentioned sand, but that would be less effective than a strap at the top that limits the angle of tipping. Maybe do both? Maybe everyone should have kept their observations to themselves when you posted an incorrect understanding of designing sub enclosures. But if you feel personally attacked by me, you'd be wrong in understanding my intention.
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post #180 of 203 Old 08-15-2019, 05:43 PM
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HAHA that is awesome. Thanks for that illustration. Ya like that message in the glue pic
No problem! That's what we're here for.

Dust? Whatchu talkin bout, Willis?
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