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Re: The Tuba 24 Compact Folded Horn Sub. [message #16238 is a reply to message #16231]

Wed, 17 March 2004 17:04

Peter
Messages: 17
Registered: May 2009

Chancellor

Hello Bill,

For a home theater/main listening system, what can one expect for in-room lower and upper f3s and f10s?

Thanks,

Peter

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Re: The Tuba 24 Compact Folded Horn Sub. [message #16239 is a reply to message #16238]

Thu, 18 March 2004 07:05

Bill Fitzmaurice
Messages: 335
Registered: May 2009

Grand Master

Corner loaded the average SPL is 99dB, with lower F3 at 32 Hz, lower F10 at 27Hz; upper F3 210Hz, upper F10 240Hz. Wall placement gives the same SPL from 62 Hz, with SPL below that down 3dB from corner placement. Measured outdoors with no boundary effects the SPL at 32Hz is still 90dB. These results are when loaded with an 8 ohm Eminence Beta 10; system average impedance is 12 ohms, with minimum impedance 8 ohms. You can get an additonal 3dB of voltage sensitivity with a 4 ohm driver for an actual impedance of 6 ohms average, 4 ohms minimum.

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Re: The Tuba 24 Compact Folded Horn Sub. [message #16240 is a reply to message #16238]

Thu, 18 March 2004 08:23

Bill Fitzmaurice
Messages: 335
Registered: May 2009

Grand Master

Here is an SPL chart: http://hometown.aol.com/fitzmauricew/myhomepage/photo.html

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Re: The Tuba 24 Compact Folded Horn Sub. [message #16241 is a reply to message #16240]

Thu, 18 March 2004 10:38

Peter
Messages: 17
Registered: May 2009

Chancellor

That is excellent, Bill; fits my system perfectly.

Thanks,

Peter

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Re: The Tuba 24 Compact Folded Horn Sub. [message #16251 is a reply to message #16224]

Sat, 27 March 2004 16:57

Adrian Mack
Messages: 568
Registered: May 2009

Illuminati (1st Degree)

Hey Bill

Just wondering, is the Tuba 24 got a path length at least 1/4wl of 30Hz? Or have you got it running as direct radiator down low?

Adrian

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Re: The Tuba 24 Compact Folded Horn Sub. [message #16252 is a reply to message #16251]

Sun, 28 March 2004 06:27

Bill Fitzmaurice
Messages: 335
Registered: May 2009

Grand Master

The horn Fc is around 60 Hz in half-space, below that radiation is primarily direct-radiator mode, though when boundary assisted in room the effective path length and mouth area is increased. The design is specifically intended for live pro-sound, where boundaries aren't usually present; within the horn passband boundary loading has little effect. On the other hand, since room loading will bring response below 60 Hz up to a reasonable level, the design is also viable for hi-fi/HT, though less than ideal. It's not a Labhorn, but at 24" cubed it was never intended to be.

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