spkrman57
wrongsideofthetracks
To put things in perspective as I see it:
Tubino posted:
"Look at it this way: a BLH can be modeled as a ported box, where the port is a long expanding flare (horn) to maximize its LF capabililties. Viewed that way, isn't it easy to see how critical the minimum opening at the start of of the port is? If it's too big, as most BLH are, then you won't get an adequate compression ratio!
To put it another way, it would seem not just possible but HIGHLY DESIRABLE to use the formula as a starting point to optimize chamber and throat size for a particular driver, with at least as much care as you would take to design size and length of ports!"
I say when the proper throat size is not achieved that the BLH acts more like a transmission line than a horn at the mouth.
Just my 2 cents of course!
Regards, Ron
Tubino posted:
"Look at it this way: a BLH can be modeled as a ported box, where the port is a long expanding flare (horn) to maximize its LF capabililties. Viewed that way, isn't it easy to see how critical the minimum opening at the start of of the port is? If it's too big, as most BLH are, then you won't get an adequate compression ratio!
To put it another way, it would seem not just possible but HIGHLY DESIRABLE to use the formula as a starting point to optimize chamber and throat size for a particular driver, with at least as much care as you would take to design size and length of ports!"
I say when the proper throat size is not achieved that the BLH acts more like a transmission line than a horn at the mouth.
Just my 2 cents of course!
Regards, Ron