or Connect
AVS › AVS Forum › Audio › DIY Speakers and Subs › 2x 18" LMS Ultra 5400 in 27 cubic foot 15hz vented enclosure build thread
New Posts  All Forums:Forum Nav:

2x 18" LMS Ultra 5400 in 27 cubic foot 15hz vented enclosure build thread - Page 2  

post #31 of 46
Quote:
Originally Posted by notnyt View Post

Silicon vapors can eat surrounds.

that was only relevant with foam surrounds and even that was a stretch at best. It will do nothing to thick rubber surrounds.

Gear mentioned in this thread:

post #32 of 46
Thread Starter 
Quote:
Originally Posted by filtor1 View Post

not, how far away from the center (between the subs) is the termination of the port?

This is something I have noticed over the years, all car audio related, that one of the drivers would unload sooner than the other and seemed to have a greater variance as the port terminated farther away from the center. In some of the larger ported enclosures I helped build, the drivers closest to the port were always the first to let go of the magic smoke when being driven to their limits. None of the drivers I used were of the caliber of the 5400, I just wanted to start the discussion, if there is any possible issue with mounting them side by side with the vertical port.

It will be almost directly between them if the length ends up where I think it will.
post #33 of 46
Thread Starter 
Quote:
Originally Posted by N8DOGG View Post

that was only relevant with foam surrounds and even that was a stretch at best. It will do nothing to thick rubber surrounds.

Agreed, was just answering the question, though.
post #34 of 46
Thread Starter 
Quote:
Originally Posted by notnyt View Post

It will be almost directly between them if the length ends up where I think it will.

I mean, I can turn the drivers so they're stacked vertically, but then I wonder if I'll end up with issues since they'll be about 7 feet apart from end to end. Hm. something to consider.

I Think I may do this to keep them equidistant to the port opening.
post #35 of 46
I think as long as it is close, there should be no issues. It was hard to tell from the drawing where the port terminated.
post #36 of 46
maybe it just depends on how hard they are being driven.

genelec's top of the line supersub is side slot ported and the drivers are all different distance from the port.

can't say i've heard of this being some great cause for concern.

post #37 of 46
You forgot two LTD:


post #38 of 46
Thread Starter 
I'm going to keep the ports running vertically, and I think I'm going to put the drivers vertical as well. More uniform wave from floor to ceiling yeah?
post #39 of 46
Thread Starter 
And if anyone is wondering why no progress yet... something new every day..

Wife driving truck home from Brooklyn. Alternator failure on the side of Southern State Parkway. Good times. Drove it home, though.
☑ Dark
☑ Below Freezing
☑ Traffic flying by 3' away
☑ Broken hood release so can't get into engine bay
☑ Only light from battery flashlight
☑ Cheap emergency toolkit

9faJI35.jpg
post #40 of 46
post #41 of 46
Thread Starter 
I think you have me confused with BassThatHZ wink.gif
post #42 of 46
Quote:
Originally Posted by notnyt View Post

I'm going to keep the ports running vertically, and I think I'm going to put the drivers vertical as well. More uniform wave from floor to ceiling yeah?

I've noticed with the placement of my subs that stacking them produces by far the most uniform response from each sub compared to the other, most of the time within 1-2db of the other across the entire range.

Side by side or one in front of the other it's amazing to me how much their response can differ. Stacked vertically though, always really close.

My vote is a vertical line of drivers.
post #43 of 46
Quote:
Originally Posted by notnyt View Post

I think you have me confused with BassThatHZ wink.gif



Nyt is actually secretly upgrading the engine to 1100hp and 0 to 60 in 2.7 seconds for 200mph in the snow, to match his Luxury 8-LMS subwoofer system.
post #44 of 46
Quote:
Originally Posted by notnyt View Post

real nice 3/4 hardwood ply. unfortunately it's only five ply

I used a 5 ply "hardwood" from Lowes, no issues. I mixed a nice 9 ply, and the 5 ply, in my quad IB attic manifold.

I remember it was Lowes, ... the young man helping me with the ply inquired what I was doing with it. I reluctantly began to explain about subs, and the attic IB manifold, I no more than started and he interrupted and went off on car audio stories rolleyes.gif I listened politely, explained I was into high end car audio in the 70's, early 80's. I shared with him I had a big, multi-way, active, ribbon tweeter, high-power system, w/big dual-coil subwoofer in my '76 Chevette, 30 years ago! He didn't know subwoofers existed back then! Yeah, we had subs in the 70's, ... we had had belts too, we used them to keep our pants up tongue.gif


Best of luck over the weekend with build progress, you've got the chops ... attention to detail, all the design talk, tips and tricks, and build updates are much appreciated. This is one to watch, your Kung Fu is good.

Quote:
Originally Posted by lukeamdman View Post

I've noticed with the placement of my subs that stacking them produces by far the most uniform response from each sub compared to the other, most of the time within 1-2db of the other across the entire range.

Side by side or one in front of the other it's amazing to me how much their response can differ. Stacked vertically though, always really close.

My vote is a vertical line of drivers.

Makes sense to me, I mentioned something similar back in post #10, these big physical elements up front, there may be significantly varying results, due to varying physical configs, interactions, etc. Also, quite likely out of sub band impacts as well.


Good luck with the vehicular issues. We've got a little snow the last few days, I just discovered my 4 wheel drive is acting oddly,.. not fully disengaging properly, in a timely manner. Winter always fleshes out this stuff.
post #45 of 46
Quote:
Originally Posted by notnyt View Post

And if anyone is wondering why no progress yet... something new every day..

Wife driving truck home from Brooklyn. Alternator failure on the side of Southern State Parkway. Good times. Drove it home, though.

...

Not fails to mention he upgraded wife's alternator on site with a DIY rotary-to-linear linkage and spare LMS motor assembly.
post #46 of 46
Subscribed.

Always watch all you'r builds with great interest. Looking forward to this one for sure. Wish ya good luck!
New Posts  All Forums:Forum Nav:
  Return Home
  Back to Forum: DIY Speakers and Subs
This thread is locked  

Gear mentioned in this thread:

AVS › AVS Forum › Audio › DIY Speakers and Subs › 2x 18" LMS Ultra 5400 in 27 cubic foot 15hz vented enclosure build thread