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>I am designing a vented enclosure for a Stryke AV12 woofer. I am wanting to get this design as "right" as possible before I build. Right now, the design is a 2 cubic foot enclosure vented to the exterior via three 3" flared ports.
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OK, then you're off on the wrong foot since the cab's way too small if the specs I have are reasonably accurate, with too many vents (adds too much acoustic resistance), unless of course you don't plan to drive with it with more than a couple of watts.
Being an HT forum, I doubt this is the case, so a compromise between a cab optimized for late night and/or SAF listening and WFO needs to be found. You don't mention what amp you're using, but I recommend it at least equals the driver's rating, and preferably 1.414-2x it as you never want to clip the amp.
Ideally you need to find out how much power the driver can heat sink before it begins compressing (Qes/Qts goes up, ergo so goes cab Vb) and design the system around this value to keep it from going non-linear when the action picks up.
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>I have some basic knowledge of how group delay affects the sound of a subwoofer, but I still wonder how much group delay is acceptable for a "musical" vented sub.
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This is so person/system/room dependent that I can only comment on what works for me in my room.
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>I was looking on the SVS web site to see if they had anything to say, and their FAQ page clarified to me that they do indeed pay attention to group delay when they design their subs. I realize that vented enclosures in general have higher group delay than a sealed enclosure, but I am really wondering what sort of group delay numbers I should be shooting for when I model the beast in WinISD. Right now, I am getting between 45ms and 55ms for my Group Delay numbers, and I am wondering how this compares to some of the subs you call "musical".
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My rule-of-thumb WRT sub duty is to tune low enough that it's decayed to inaudibility by 60Hz which means a tuning point at/below the lowest signal the system is likely to see. 16-18Hz works well for both HT and organ music, with <27Hz for all other music in a music only system.
Group delay increases with decreasing frequency, while our hearing acuity continues to decay, so hearing high GD numbers down low isn't an issue. Anyway, the room is screwing with the sound so much below its first mode it's academic. You'll hear the box Vs an IB, but that's it if it's well constructed.
With systems tuned higher, you either have to like the slightly resonant quality of low audible group delay (and many folks do) or care must be taken to critically damp the vent to quell it.
GM
Loud Is Beautiful, If It's Clean
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