As the topic states, I'm curious what woofer parameters are most important for getting deep bass in a small box. Low Fs and high Xmax come to mind. But what else? Low Vas?
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Most important parameters for deep bass in a small box?
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F3 is determined by Fs and Qts(higher is better). Vb is determined by Vas and Qts(lower is better).
At a Qts right around 0.40 you can usually get F3 to = Fs, and Vb to = Vas.
As Qts rises, F3 goes down and Vb goes up. Going below 0.40 Qts, F3 rises and Vb goes down.
Look at TangBands W5-1138 and W6-1139 for inspiration.
Port length becomes problematical.
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$$$ is the most important parameter
Lots of money for a big motor on the driver, lots of money for a big amp to effectively drive an inefficient setup, lots of money to get a capable passive radiator because the port lengths in a small box aren't practical.Thanks,
Aaron
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Originally posted by Mr Sinister View Post...deep bass in a small box.
For full spectrum music reproduction nothing, (IMO), NOTHING can hold a candle to a large, high sensitivity woofer in a large (make that 'appropriately' sized) enclosure, except two of them.
Movies, different story - in that application you can easily put up with some forced/active bass from a subwoofer, go small box, high excursion woofer, eq it to satisfaction.Constructions: Dayton+SB 2-Way v1 | Dayton+SB 2-Way v2 | Fabios (SB Monitors)
Refurbs: KLH 2 | Rega Ela Mk1
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Hofmann's iron law, pick two out of three....
1. Low bass reproduction
2. Small enclosure size 3. High sensitivity
Because you want the first two you need to look for a low efficiency driver and throw a boatload of power at it. So lots of Xmax and amp power.....
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Originally posted by aarond View Post$$$ is the most important parameter
Lots of money for a big motor on the driver, lots of money for a big amp to effectively drive an inefficient setup, lots of money to get a capable passive radiator because the port lengths in a small box aren't practical.Francis
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Originally posted by fpitas View PostBe practical about your expectations. Bragging rights aside, music doesn't usually have much below 40Hz, and in the normal listening room you'll get cabin gain, which will tend to boost the lowest frequencies.
When something in my playlists shows up with 30 something content that I know should be there, but isn't reproduced... that makes me very sad :(. Granted, that's a small percentage of my listening, but that small percentage is important and really cool when reproduced. I shoot for mid to low 30's myself for music, and low 20's for movies.Electronics engineer, woofer enthusiast, and musician.
Wogg Music
Published projects: PPA100 Bass Guitar Amp, ISO El-Cheapo Sub, Indy 8 2.1 powered sub, MicroSat, SuperNova Minimus
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Originally posted by wogg View Post
...usually...
When something in my playlists shows up with 30 something content that I know should be there, but isn't reproduced... that makes me very sad :(. Granted, that's a small percentage of my listening, but that small percentage is important and really cool when reproduced. I shoot for mid to low 30's myself for music, and low 20's for movies.Francis
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Originally posted by fpitas View PostSure, I agree. But I bet you're not expecting miracles from a tiny subwoofer, either.Electronics engineer, woofer enthusiast, and musician.
Wogg Music
Published projects: PPA100 Bass Guitar Amp, ISO El-Cheapo Sub, Indy 8 2.1 powered sub, MicroSat, SuperNova Minimus
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Look into passively-assisted sealed systems. Other than using PRs, it just might be the best way to get a lower F3 in a small box.
Brian Steele
www.diysubwoofers.org
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