Infinte baffle characteristic?

[shank1207]

What is the ideal infinite baffle characteristic also it would be helpful if i knew the difference in terms of efficiency compared to sealed and ported systems.

 

[cvjoint]

I've found the following characterizes a good infinite baffle:
*strong such that vibrations and resonance are minimized
*separates the front wave from the rear wave very well; no leaks
*arranges the speakers dual opposed; force cancelling design

Efficiency will depend on the frequency in question and how much cancellation exists around the baffle. Typically, IB is more efficient than sealed but less efficient than a ported box.

 

[sreten]

Hi,

In theory an infinite baffle driver has no limitations at all.
Ask a more sensible question for a more sensible answer.

rgds, sreten.

 

[chrisb]

Perhaps as good an answer as any would be another question - what is your intended application?
As with numerous other technically excellent topologies, the "where" and "how" the system will be used must be included in the design calculus.

 

[Ron E]

I was going to answer: It might be better if you ask a question which has an answer I waited and others have the same impression

 

[shank1207]

I am sorry if it did not make sense i just wanted to compare a driver in closed box case with infinite baffle. Like what is the limit, and how much effeciency we are losing when mounting in closed box.

 

[Zero D]

compare a driver in closed box case with infinite baffle.

It all depends on how "infinite" you mean. Just for clarity, some people & vendors, call a closed box infinite baffle.

A closed box will MORE effecient in the bass, & reflexed about 3db MORE than reflexed !

 

[Ron E]

hypothetical driver
Fs 20 Hz
Qts 0.405
Qes 0.45
Vas 100 Liters
Re 2.7 ohms

case 1 is infinite baffle
case 2 is a 40liter sealed box
case 3 is a 100 liter vented box tuned to 20Hz

All produce the same midband SPL - 89dB at 2.83 volts

 

[djn]

I thought that an IB driver had to have a higher Qts. Something around .8 to 1.2

 

[shank1207]

Great thanks

 

[Circlomanen]

I thought that an IB driver had to have a higher Qts. Something around .8 to 1.2

If you have any way to EQ the signal then it is much better with a much stronger low Q driver. You need a lot of voltage-swing but not a lot of current if you use high efficiency pro drivers. B&C 15TBX100 is a good OB driver for bass duty. You can get great efficiency from OBs. It is as usual a large radiating surface, low moving mass and lots of BL (motor strength) that will create efficiency.

Cheers,
Johannes

 

[AVWERK]

Check out the cult of the infinitely baffled site

Regards
David