Dual 10" in steel enclosure

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#21
planet10 said:
Strenth shouldn’t be an issue, but the benifits of push-push cannot be underestimated.

And, completely personally, i dislike th ecosmetics of a cylindrical mount perpendicular to the main tube is ugly I hate the looks of the B&Ws (among others) that do this.
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Dave,

There are many that use tactile transducers exclusively for their very low frequency reproduction.
Although end mounting of the two drivers would largely reduce external force transmission, elimination of tactile sensation from that transmission being a “huge advantage” is your opinion, which is by no means universally shared.

Considering the weight of the loaded cabinet will be upwards of 100 kilograms, transmitted force won’t be much of an issue any way, and your concern about the loss of structural integrity in a 15mm thick steel tube compared to any standard wood-based construction is laughable.

Your personal aesthetic considerations are noted ;^).
 
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#22
jan.didden said:
You should also plan for some internal damping material. That steel will ring like hell.
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Actually, given the bandwidth of the wooder, the steel tube, on its own, should have high enuff potential resonances and they will never be excited. And lousdpeaker vibrational energy load is decreased by some 90% or so with push-push.

Especially if you do not do the silly (to my mind) tube in tube scheme. Forcing such a shape into the kind of box we build with wood is silly to me.

Many cyclindrical subs have been done using the inherent strength of a cyclinder to advantage, the bucket subs the latest. A woofer placed in the end of a steel bucket (much, much thinner than this one) with no ringing issues.

dave
 
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#24
Personally I like the cylindrical look of the 800 series B&W speakers, that was actually what came to mind when I designed this.

I have enough material, I could easily build both styles of enclosures by simply having an extra set of driver rings laser cut. The small "push push" style enclosure would take me very little effort to make. Maybe I'll just make one for science.
 
#27
brandon3212276 said:
Personally I like the cylindrical look of the 800 series B&W speakers, that was actually what came to mind when I designed this.

I have enough material, I could easily build both styles of enclosures by simply having an extra set of driver rings laser cut. The small "push push" style enclosure would take me very little effort to make. Maybe I'll just make one for science.
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Cabinet resonances are equally excited when speakers are arranged in “push-push” opposition or on one plane.
Typically, the vibrational movement of a cabinet relatively heavy compared to the driver’s moving mass makes no measurable audio difference. Transmission noises from the vibration could make a difference, but are easily damped with rubber feet.
If you place the "push push" cabinet vertically, science (measurement..) will demonstrate that the eventual cone sag will have far more actual audio effect than than any due to the mechanical vibration of the cabinet moving back and forth, or not when cancelled by opposition.

Since the room will dominate low frequency sound frequency response, making two separate single driver cabinets that can be best located to reduce modal variation, rather than one dual opposed or dual single plane cabinet would have far more easy to measure consequences than the above.
 
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#28
weltersys said:
Cabinet resonances are equally excited when speakers are arranged in “push-push” opposition or on one plane.
Typically, the vibrational movement of a cabinet relatively heavy compared to the driver’s moving mass makes no measurable audio difference. Transmission noises from the vibration could make a difference, but are easily damped with rubber feet.
If you place the "push push" cabinet vertically, science (measurement..) will demonstrate that the eventual cone sag will have far more actual audio effect than than any due to the mechanical vibration of the cabinet moving back and forth, or not when cancelled by opposition.

Since the room will dominate low frequency sound frequency response, making two separate single driver cabinets that can be best located to reduce modal variation, rather than one dual opposed or dual single plane cabinet would have far more easy to measure consequences than the above.
Click to expand...
That was a good read, thanks for that. While I totally agree that 2 seperate cabinets is better for a variety of reasons I think I'm going to stick with a single enclosure for this project.
 
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