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  1. UM18-22, Help understanding WinISD SPL, Signal EQ and cone excursion

    DIY Subwoofers - General Discussion
    I'd never used WinISD, but modeled a Dayton Audio 18" UM18-22 sub in a sealed 4 cu ft enclosure. I also don't have the sub or amp yet. I think I put the parameters in correctly, and seem to get a -3dB point close to what parts express shows. However, I don't fully understand the point of the...
  2. Cone excursion, playing with volume, etc

    DIY Subwoofers - General Discussion
    Hello everybody, I'm considering building two sub-woofers in a cylinder shape like the SVS PC13-Ultra and more or less of the same size. The problem is that I don't have any experience as so far I only built a pair of speakers but those were based on an existing project already and anyway it's...
  3. QTC, Displacement and Excursion question

    DIY Subwoofers - General Discussion
    Here's a 100$ question... If you're building a box in which you put around 1lb polyfill per cuft of volume. Does the polyfill "reduce" the box capacity.. IE do I have to account for the polyfill value when simming the drivers ? Filling with polyfill artificially makes the driver think the...
  4. IB with 4 15" high excursion woofers

    IB - Infinite Baffle Subwoofer Build Projects
    Hi all, First post here and looking for advice from the experts. I'm in the proces of building my dedicated HT. Size is 4.2m wide 6.3m long and 3m ceiling. I have prepared a sand stage where the speakers will stand but I also have two 40*40 cm holes down to my crawlspace. So I'm...
  5. Over Excursion Issues???

    System Setup and Connection
    I have made an alignment with a speaker in a ported box (the speaker isn't the best for vented (Qts too high)... but I really wanted some practice with this system). It was actually made for a car.. but moreover to the important stuff! I ran the program from diy-subwoofer.org and obtained the...
  6. New FI BL N1 driver. How much excursion

    DIY Subwoofers - General Discussion
    Just watched this on youtube and was impressed with how much excursion. Would be nice if the new FI line was like this. cheers Graham
  7. 15" Titanic mk3 over excursion problems

    DIY Subwoofers - General Discussion
    I have a pair of 15" Dayton Titanic Mk3 subs in 3.5 cuft sealed enclosures. They are driven by a pair of Dayton 1000w amps. I have run into over excursion problems when driven very loud at all. Subsonic filter helps a little. These will be paired with a Maelstrom 18" ported tuned to 15hz...
  8. SPL, excursion, efficiency, reference levels

    DIY Subwoofers - General Discussion
    I am experimenting a little with my LLT sonotubes, and tried laying them on their sides. So for the first time I've gotten a good look at the drivers while they are working. Did measurement sweeps today, and some pink noise. I was curious as to how much movement I got when pushing the tubes a...
  9. target curve vs cone excursion

    Electronic Processing/Equalization Devices
    When I'm adding filters with my BFD to acheive the target curve, be it a flat response or house curve, do I need to concern myself with the affect those filters will have on my cone excursion? With my current PB13's I've filtered away to acheive my curve with no thought toward cone excursion...
  10. M-X cone excursion vs. surround excursion

    DIY Subwoofers - General Discussion
    Hi Guys, I know the excursion of the cone for a M-X 18" driver, but if you were to measure the excursion of the surround what would it be? I mean from the resting position of the surround, how much further from that point will the surround go with the full excursion of the driver? I hope that...
  11. driver excursion with various tunings but same volume and power

    Home Audio Subwoofers
    So once in a while I play around and learn a little from it. I've always noticed a weird trend when modeling up the same driver, same volume, same power...just different tunings. When I only compare 2 or 3 different tunings it appears there are drastic differences where Xmax is reached. But if...
  12. Suspension noise in big excursion drivers?

    DIY Subwoofers - General Discussion
    How much does suspension noise vary between drivers? I have an SDX15. At about 15mm it begins to make gurgling/motorboating noises (tested in free air at 20Hz). These noises steadily become worse until by full travel it's making quite a bit of racket. Just curious if the other popular...
  13. my math is correct, why more excursion at tuning?

    DIY Subwoofers - General Discussion
    My enclosure is 21 cubic feet after sub/port displacement, tuned to 15.42Hz. The port is a 7.75" sonotube 19.5" long, leaving 8.25" port clearance at the back. external 42" wide = 40.5" wide internally front 38 tall, rear 32 tall = 36.5" + 30.5"= 33.5" average height bottom depth 30.5" top 28"...
  14. Controlling excursion below tuning frequency

    DIY Subwoofers - General Discussion
    Is there a subsonic filter most are using with the pro amps to control excursion below the tuning frequency on the LLT enclosures? I loaded Winisd Pro and have been modeling some of the designs some of you have already built to try to get an idea if my thinking is correct or not and when I got...
  15. WinISD - Sonosub Cone Excursion Graph

    DIY Subwoofers - General Discussion
    Can WinISD calculate the cone excursion for a ported sonosub enclosure? I have attempted do calculate this, but the excursion data seemed awfully low (i.e. .05 inches).
  16. Mal-X Excursion - Grill question

    DIY Subwoofers - General Discussion
    Kevin or anyone, maybe you can help me...... I'm finishing my boxes - Baltic Birch Ply... Used Neo-Dan's Sealed cut sheet.... (Thanks as always Dan) My question, will 3/4" ply wrapped with grill cloth be enough distance with the driver recessed 3/4" to cover it without it being interfered...
  17. Measuring driver excursion

    DIY Subwoofers - General Discussion
    Hi I have been playing around with REW's sinewave generator option.(again) Measuring cone excursion is a bit of a trial. (and error) I set up a lab retort stand with a dowel clamped vertically in front of my IB drivers. Then I made a sort of flag indicator out of folded masking tape...