bass box questions

Post by **Bfowler** » Wed Feb 07, 2007 3:09 pm

so i have a couple quick questions. (actually i have a ton, but lets start with these.

in the driver properties window. what is the Le: figure mean?

also, what does one do with the response tab?

(this is BB6 pro btw)

Post by **Francious70** » Wed Feb 07, 2007 3:16 pm

Le is inductance, inductance will affect the "Group Delay" graph.

And the response graph just shows you what the FR would be in an anechoic chamber.

Post by **stipud** » Wed Feb 07, 2007 3:19 pm

Response tab is for importing acoustical data taken from an RTA... you do this and then you can interpolate the T/S parameters from it.

Le is a thiele small parameter for voicecoil inductance.... it's mostly an interpolation of the amount that the woofer rolls off in higher end. The voicecoil becomes an inductor because it cannot move the bigger woofer at the higher frequencies.

http://en.wikipedia.org/wiki/Thiele/Small

Post by **Bfowler** » Wed Feb 07, 2007 3:35 pm

so since most modeling software neglects this (according to wiki, which makes sense since i never see it in the manuals) it is OK that i always leave it blank?

Post by **stipud** » Wed Feb 07, 2007 3:37 pm

It doesnt really affect anything below 100Hz, and I assume you aren't using BBPro for anything but subwoofer modeling, so no problem.

Post by **Bfowler** » Wed Feb 07, 2007 3:40 pm

makes snese. thanks.

basically this was brought on by me making graphs comparing subs....and errin sending me graphs that looked different. i am trying to figure out why

Post by **VW337** » Wed Feb 07, 2007 3:55 pm

You may have yours set for home vs car if you are trying to come up with the cabin gain.

Post by **Bfowler** » Wed Feb 07, 2007 3:56 pm

I dont think i have it trying to compensate for any gain.....im just doing basic...."enter paramters from manual, set a box size, plot"

Post by **VW337** » Wed Feb 07, 2007 3:58 pm

Next time you swing by I can give you a general run through on BBpro.............

Post by **Francious70** » Wed Feb 07, 2007 5:07 pm

I can help you with the math if you need it, but I think you might be able to figure it out.

Post by **Francious70** » Wed Feb 07, 2007 5:09 pm

oh btw, i don't know if you know this, but if you click the parameter unit (such as Cubic Feet for VAS) you can change it's measure (such as to Liters for VAS)

Pete. · Post by **Pete.** » Wed Feb 07, 2007 6:05 pm

what size of box has it suggested for you? i sometimes find it gives massive boxes but then again it is probably something im doing wrong!