Terry Cain's BIB -why does it work and does anyone have those Fostex Craft Handbooks?

[Circlomanen]

I am building a Proa in my livingroom so its very messy.

One in each corner. This is not where i intend to place them. They are to far apart. I just want to test them while building my proa.

You can probably see the other one behind the bookshelf. There is a piano standing in my way so i could not get a better angle.

Johannes.

[Godzilla]

Your BIBs will bring that room to life with sound. You will be one of very few who built theirs using pro drivers with such a low crossover. I bet it sounds very dynamic and lifelike. Post more pics when you can.

[BenjaminWebber]

YUP!

[Circlomanen]

Your BIBs will bring that room to life with sound.

Yes they do that very easily. They dominate the room-acoustics and greatly damp any room-resonances except the main one between the ceiling and the floor. The bass i "short" and powerful. I should have made the BIBs bigger. Bigger is better as we all know!!! They sound a bit lean when driven directly from the amp. Not bad or lacking anything, just a bit lean. There is absolutely no "boom" or anything excessive in the sound. Just very sharp, fast and high resolution. I run them with a 5 ohm power-resistor between the amp and the driver, and that makes them much smoother and fuller in the sound.

I will post more pictures when i have a high frequency-driver of some sort.

Johannes.

[Circlomanen]

I had reversed one driver.....

Well, thats very easy to correct, and since doing that they are everything except lean. The have a very powerful and dynamic bass-reproduction.

I have checked the cable several times, but it was wrong inside the BIB so i did not notice from the outside.





The first picture is from my listening position. The other one i closer to one of the speaker.

They are very nice sounding. Lots of very well defined and very powerful bass. Yet they are fast and very detailed.

Johannes.

[Etocynned]

Okay, heres a question.

Are there any commercial examples of a BIB?

Seems such a shame that there are some spectacular designs that have been ignored.

[Circlomanen]

Yes there is some commercial BIB-speakers. I cant remember who makes them, but there is links earlier in this thread.

I have found one, but i believe there is at least two more.

Bach

Johannes.

[chrisb]

Originally Posted by Etocynned

Okay, heres a question.

Are there any commercial examples of a BIB?

Seems such a shame that there are some spectacular designs that have been ignored.

Well, one of the issues with a commercial version of a BIB, even for smaller drivers could be the first letter of the acronym - "Big" refers to why the enclosures work so well, but would also impact on shipping costs.

Even for goods that are not particularly heavy, (such as say, a 48" tall box of paper backed wood veneer, which is mostly a box of air) "cubed" weights can get very expensive.

[Godzilla]

Not sure why there are any commercially available BIBs???

[ghpicard]

Originally Posted by Godzilla

Not sure why there are any commercially available BIBs???

Probably to cater non-woodworking / too lazy people.

However I wonder how is this being addressed regarding profit / license / etc. on a "public domain" (not sure about this) design.

This one, however having being analyzed some times with MJK's spreadsheets, has not been designed with them so IMO no problem there. Actually who I remember as actively helping the development of the formulas behind it were Greg (GM), and also Scott (Scottmoose). I might have forgotten someone, and I also do not consider making a spreadsheet out of a formula real design work - I myself refined one of them which was in its time hosted in your site.