Taz Posted January 3, 2014 Share Posted January 3, 2014 Not a lot of room in the upstairs living room, wondering how a sub in the ceiling firing straight down wood work. John Quote Link to comment Share on other sites More sharing options...
CECAA850 Posted January 3, 2014 Share Posted January 3, 2014 If calibrated properly, it should work fine. Mine are close to the ceiling, if you didn't look up and see them, you wouldn't know they were there. Quote Link to comment Share on other sites More sharing options...
SuBXeRo Posted January 3, 2014 Share Posted January 3, 2014 Will it work? Yes/No What sub/s are you looking to use? Not all subs are rated for down-firing use. Drivers can be more prone to driver sag as well as mechanical over-excursion if you dont have the correct T/S parameters. Quote Link to comment Share on other sites More sharing options...
CECAA850 Posted January 3, 2014 Share Posted January 3, 2014 Drivers can be more prone to driver sag as well as mechanical over-excursion if you dont have the correct T/S parameters. Never seen T/S parameters for sag (maybe I mis-read your comment?). Over excursion is normally caused by the driver unloading from sending it a signal below the tuning frequency of the box or too much wattage. That could happen no matter where the sub is located. Quote Link to comment Share on other sites More sharing options...
SuBXeRo Posted January 3, 2014 Share Posted January 3, 2014 (edited) When a sub is inverted, the spider and cone will sag more or less depending on materials, weight and design of the driver. If the driver sags, it is already expending some of its mechanical travel which means it will need less power to reach mechanical limits which can also affect its accuracy. I had looked into doing a sono-sub at one point and the sono-sub calculator takes into account a drivers T/S and tuning if any to let you know if a sub is a good candidate or not for a down-firing position. I can't pretend to know the full math behind it all but driver sag isn't a new theory. Look at a lot of the old vertical woofers, some have sagged and need to be turned 180 degrees. Drivers can't defeat gravity forever! It's been a bunch of months since i last looked at the sono-sub program because i bought my SVS subs and no longer needed to worry about a DIY project. Edited January 3, 2014 by SuBXeRo Quote Link to comment Share on other sites More sharing options...
CECAA850 Posted January 3, 2014 Share Posted January 3, 2014 (edited) I had looked into doing a sono-sub at one point and the sono-sub calculator takes into account a drivers T/S and tuning if any to let you know if a sub is a good candidate or not for a down-firing position. Yes, you can use TS parameters in a calculation to see if the driver is prone to sag or not but I thought you were saying that there is a specific T/S parameter just for sag. If calculated sag is more than 5% of the drivers Xmax (1 way linear travel) it's not suitable for horizontal mounting. Edited January 3, 2014 by CECAA850 Quote Link to comment Share on other sites More sharing options...
SuBXeRo Posted January 4, 2014 Share Posted January 4, 2014 Oh, no no no, i didn't mean there was a specific sag t/s, sorry, didnt mean to make that confusing. Quote Link to comment Share on other sites More sharing options...
McMiRA Posted January 4, 2014 Share Posted January 4, 2014 So. Don't fire it down. Suspend a folded horn in the rafters and open the mouth through the ceiling. Inverted version of mounting your sub in the basement and firing it through the floor. Build a proper grill and most might not even notice it there. 1 Quote Link to comment Share on other sites More sharing options...
mustang guy Posted January 4, 2014 Share Posted January 4, 2014 This looks like an option: Quote Link to comment Share on other sites More sharing options...
mustang guy Posted January 4, 2014 Share Posted January 4, 2014 Or this if you wanna be wild and crazy: Quote Link to comment Share on other sites More sharing options...
Taz Posted January 4, 2014 Author Share Posted January 4, 2014 (edited) I was thinking along the lines of an Infinite Baffle as it is a long crawl through a small opening at the other end of the house. The less fabrication in the attic the better. Maybe I should consider mounting the drivers as in a normal speaker into a box with a 45 degree angle to bounce the wave into the living room? Somewhat like mustang guy shows in his first photo. I think the second photo would totally overwhelm my system. However?????????? Does that second photo have 9 or 12 drivers? John Edited January 4, 2014 by Taz Quote Link to comment Share on other sites More sharing options...
mustang guy Posted January 4, 2014 Share Posted January 4, 2014 LOL, no idea. I nabbed those pics from another site. The link is http://cdn.head-fi.org/4/4f/350x700px-LL-4fb4016e_Pauls_IB_Gemini_GalleryPic.jpeg Quote Link to comment Share on other sites More sharing options...
McMiRA Posted January 4, 2014 Share Posted January 4, 2014 You have to cut a hole in the ceiling anyways. You could do a little bit of Preplanning and a lot of measuring and maybe do a rough out frame with some blind nuts that allows you ( and some friends) to lift a loaded infinite baffle through the ceiling and fasten it in. Quote Link to comment Share on other sites More sharing options...
CECAA850 Posted January 4, 2014 Share Posted January 4, 2014 Does that second photo have 9 or 12 drivers? 12 Quote Link to comment Share on other sites More sharing options...
McMiRA Posted January 4, 2014 Share Posted January 4, 2014 I have never heard an infinite baffle. Very curious n Quote Link to comment Share on other sites More sharing options...
CECAA850 Posted January 4, 2014 Share Posted January 4, 2014 I have never heard an infinite baffle. Very curious n See my pic in the Home Theater Showcase. it's the last one. Quote Link to comment Share on other sites More sharing options...
derrickdj1 Posted January 4, 2014 Share Posted January 4, 2014 This is an interesting discussion. I would love to see a build thread and follow along. Quote Link to comment Share on other sites More sharing options...
McMiRA Posted January 4, 2014 Share Posted January 4, 2014 Maybe hide a couple THT's in the attic. Hehe Quote Link to comment Share on other sites More sharing options...
CECAA850 Posted January 4, 2014 Share Posted January 4, 2014 This is an interesting discussion. I would love to see a build thread and follow along. I'm trying to talk wakejunkie into building one now. Quote Link to comment Share on other sites More sharing options...
CECAA850 Posted January 4, 2014 Share Posted January 4, 2014 Here's the backside of mine prior to completion, Quote Link to comment Share on other sites More sharing options...
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