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  • planetp commented on Marsh's instructable Build an Inexpensive Sub-woofer3 years ago
    Build an Inexpensive Sub-woofer

    I just wanted to comment on the thing with T/S parameters and building speakers. So, first, what TheAppleSauceMan says is certainly true and if one wants to build high quality speakers then traveling down that rabbit hole is certainly worth the effort. Here's the thing though. The sub here is a sealed box design. It's known as an "acoustic suspension" design, which, isn't that important by itself, but the details might help people look things up. In any case, the thing with sealed box designs is that no matter the speaker, the design will roll off the bass smoothly largely as a function of box volume.A brief discussion of speaker design history can be found at the following link.http://ohmspeaker.com/news/sealed-box-speakers-or-...What does that mean? It means that, to a point...

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    I just wanted to comment on the thing with T/S parameters and building speakers. So, first, what TheAppleSauceMan says is certainly true and if one wants to build high quality speakers then traveling down that rabbit hole is certainly worth the effort. Here's the thing though. The sub here is a sealed box design. It's known as an "acoustic suspension" design, which, isn't that important by itself, but the details might help people look things up. In any case, the thing with sealed box designs is that no matter the speaker, the design will roll off the bass smoothly largely as a function of box volume.A brief discussion of speaker design history can be found at the following link.http://ohmspeaker.com/news/sealed-box-speakers-or-...What does that mean? It means that, to a point, the size doesn't matter in that you will simply get less bass than you expect if the box is too small for the speaker that you are using. So, in practical terms, just build a box that works for you and put your speaker in it. Yes, some speakers will require a larger box to produce the same bass response as others, so some speakers will work better in a box of a given size than others. But there's no magical box size such that if you get it wrong it will sound really bad. Note, this isn't true with more complex designs such as vented speakers or bandpass boxes. As long as you're building a sealed box, it will work fine. If it doesn't go low enough, you can build a bigger box, or, you can use different driver. So, how do you choose a driver without crunching numbers? Just use a speaker designed for small boxes in the first place, get yourself a car subwoofer, just make sure that you have plenty of power to drive it with.In conclusion, for reasonable results for your living room, build a box of a size that kind of works for you, as in this instructable, and stuff it with a car-subwoofer speaker. It will work.

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  • planetp followed Marsh3 years ago