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  1. Travis_G

    The best book to learn

    Get a copy of the Loudspeaker Design Cookbook by Vance Dickason.
  2. Travis_G

    Building a sub, suggestions on driver/enclosure?

    Loudspeaker Recipes Book One I tend to believe my own ears on the matter of subwoofers and localization, however I make room for the possibility that it is a room effect, as is suggested in the article. But I'm not sure who to believe on the issue of FR. Maybe someone else has some more...
  3. Travis_G

    Building a sub, suggestions on driver/enclosure?

    89.7 dB SPL is good Matt. You can use any size woofer in a vented box. Typically you want a speaker with an Fs/Qes ratio (efficiency bandwith product) of ~ 40 or more for a vented enclosure. For this speaker EBP is 54 making it fine for both vented and sealed enclosures. If I might ask, why...
  4. Travis_G

    Building a sub, suggestions on driver/enclosure?

    A ported box will give you the most bang for the buck. I tend to favor them for HT. A sealed will give you 'tighter' bass but with tunings in the teens I wonder if it's even audible with most program material. In my experience, ported boxes behave like sealed boxes ~ 1 octave above tuning and...
  5. Travis_G

    Building a sub, suggestions on driver/enclosure?

    By the way, did you want to build a sealed or vented enclosure? I usually design the enclosure before I pick an amp. That way I know how much power it will take to drive the subwoofer to it's mechanical limit. Travis
  6. Travis_G

    Building a sub, suggestions on driver/enclosure?

    You might also consider the Acoustic Elegance AV 15. It's about the same as the driver you are looking at in terms of displacement (slightly more actually) and it's a little less expensive. Thermal power rating is a little lower but not significantly IMHO (less than 3 dB difference). I would...
  7. Travis_G

    Will this work?

    It should be fine if it's got a gasket on it. If you are worried about it, run a bead of silicone around the edge before you install it. Travis
  8. Travis_G

    Damping Material In Subs. Why Bother?

    Thomas, I respect your right do disagree with me. I hope that we can disagree without being disagreeable. BTW I believe what Noah stated was that the output from the walls flexing would be 20 dB from the drivers output, and would be out-of-phase with the drivers output. So worst case it would...
  9. Travis_G

    Damping Material In Subs. Why Bother?

    Mark Seaton, AVS special member described it like this Thomas: regards, Travis
  10. Travis_G

    Damping Material In Subs. Why Bother?

    Thomas, Damping material just does what it does. It does not need to be "educated." Where wavelengths are comparable to the thickness of the material, frictional loss is prevalent. In other words, sound passing through the fibers causes them to vibrate and friction turns sound energy into...
  11. Travis_G

    Damping Material In Subs. Why Bother?

    Tom Nousaines has a couple rules of thumb he published in March/April Car Stereo Review 1995. The article was called, "Make a small box act like a larger one with polyester fiberfill." Travis
  12. Travis_G

    Damping Material In Subs. Why Bother?

    Thank you Danny for the info. Thank you Chris. I am aware of Thomas reputation, as I have followed this forum for some time. I was a member of this forum about 6 years ago back when Tom Vodhanel and Ron Stimpson were the gurus here and occasionally you would even see posts from Dan...
  13. Travis_G

    Damping Material In Subs. Why Bother?

    Thank you for your replies Thomas. Sorry if I failed to communicate effectively. Travis
  14. Travis_G

    Damping Material In Subs. Why Bother?

    Sorry Thomas, I edited right after your post to make mine clearer. Let me clarify. In full range speakers, standing waves inside the enclosure as well as waves reflected from the enclosure walls may be reflected out through the cone of the speaker. This WILL cause response deviations as many...
  15. Travis_G

    Damping Material In Subs. Why Bother?

    Absolutely, I wouldn't expect you to. And you are right, it is easier as well as cheaper to ask the questions here. After all, isn't that what this forum is here for? Besides that, some other folks may have the same question that I do. If you have some reference for me to read I would be...
  16. Travis_G

    Damping Material In Subs. Why Bother?

    I don't mind doing it if there is a valid reason to. I just want to understand what that reason is. To be perfectly honest, I am still not convinced that there is a reason for fibrous damping material in subwoofers. However, if I am wrong than I want to know. This forum is after all a place to...
  17. Travis_G

    Damping Material In Subs. Why Bother?

    Thank you Leo, That is true for extensional damping compounds like roofing felt and tar. I am asking about fibrous material like dacron and fiberglass. I should have been more specific. I have never used any damping material in a subwoofer, except a car sub where space was a concern. They...
  18. Travis_G

    Damping Material In Subs. Why Bother?

    Thank you Thomas, but that still does not answer my question. You say that damping material is not added to eliminate standing waves. Fair enough, but why then IS it added? Are you sure? I thought that Siegfried Linkwitz' THOR did not use any. I could be wrong though. Besides you know...
  19. Travis_G

    Damping Material In Subs. Why Bother?

    The subwoofer I'm building will be 12 ft^3 and it's longest dimension will be 4 ft. The lowest standing wave mode will be just above 140 Hz. If the 24dB/octave xo is at 80 Hz then the response will be ~ 20 dB down @ 140 Hz. Obviously it's big box, and a smaller one would have it's lowest...
  20. Travis_G

    DIY 120 V power filter

    Paul, Thank you for your response. I am not sure what is causing the noise. I think the only thing on the circuit besides the HT possibly the furnace. I could turn it off and see if that solves the problem. I think the primary problem is that the gain on my reciever is turned up so high...
  21. Travis_G

    DIY 120 V power filter

    I am getting a popping noise in my sound system and the guy at the Pro Audio store thinks that electrical noise is the problem. He also wanted to sell me a $100 power filter. I was wondering if anyone has tried builing thier own simple filter using inductors and capacitors in series with my...
  22. Travis_G

    Just got an avalanche 15..... now.... what?

    Thank you Thomas. I was not sure what driver that you used only that it was not an avalanche 15. And as the quote shows, I did not say that it was a Tempest, I said it was possibly a Tempest. Also without knowing the driver we can not know if the pertinent T/S parameters are similar or not...
  23. Travis_G

    Just got an avalanche 15..... now.... what?

    Thomas used a different driver though Ben. Tempest possibly? It may sound great with an Avalanche 15 but then it may not. There is no way of telling unless you model it's response before you build it. Travis
  24. Travis_G

    Just got an avalanche 15..... now.... what?

    It's a good design Ashan but Steve is using a different speaker. If you use the same box you will get a peak 1-2 dB peak in frequency response and you won't be getting the deepest bass possible for your speaker. If you lengthened the ports to 30" it would smooth out the frequency response and...
  25. Travis_G

    Just got an avalanche 15..... now.... what?

    Ported subwoofers can sound boomy and slow because they rely on stored sound energy that is released through vent, so there is some delay. Most sealed subs also rely on stored energy as well and they are not immune to sounding boomy and slow. As long as you keep group delay below 33 milliseconds...
  26. Travis_G

    Just got an avalanche 15..... now.... what?

    Ashan, A passive radiator is a substitute for a vent. If you want a sealed design then a passive radiator won't be necasarry. I second what Steve said, you can get deep bass from a sealed box but you need lots of amp power and either an EQ or LT. If you are tuning the box to ~ 18 Hz or so...
  27. Travis_G

    Who's gone from plate to pro and been OK?

    Probably an on/off transient.
  28. Travis_G

    Why Go Sealed?

    Thanks guys. A well designed ported sub will not have a strong bass hump, and at 30 Hz and up, where it matters most this one will more or less behave like a large sealed enclosure anyways. I am wondering how often transients lie below 30 Hz, which would be degraded by excessive GD. Kick drum...
  29. Travis_G

    Why Go Sealed?

    I am modeling a coffee table sub with Win ISD. I'm using an AE AV15 in a 12ft^3 box with dual 4 " vents tuned to 17 Hz. Above 31 Hz, GD actually looks about the same on the vented enclosure as on the sealed of same internal volume. Below 31 Hz the sealed box has great looking GD but doesn't...
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