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

[Godzilla]

Great extension for a 4"!

[Circlomanen]

What is the gray wadding you are using?

Im sorry for this very late replay, buts its a very thick rug.

I bet it has a powerful sound! Awesome!

Thanks!! I like the a lot, but they sound a bit lean. I think there is leaks in the current mounting of the driver. Im going to glue on another layer of plywood on the front, and make them more airtight around the driver. I just got to find some time and energy. I prefere sailing during the short summer-months up here in sweden.

Regards
Johannes.

[GM]

Originally Posted by Godzilla

Great extension for a 4"!

Yeah, I never tried loading anything < 8" in any of my big corner horns as they were tuned to Fs and back then, smaller drivers were typically > 100 Hz, so just assumed they would self destruct on vinyl's typically 'thumping' so called bass [mid bass actually] if not high passed, ergo saw no point in wasting any time/materials on what seemed a 'fool's errand'. It never occurred to me to tune them same as a WG [or lower to better couple to the room] until TC PM'd me about the Japanese pipe horn.

GM

[GM]

Originally Posted by Circlomanen

Im sorry for this very late replay, buts its a very thick rug............but they sound a bit lean.

Even small leaks tend to cause the speaker to unload enough to self destruct except at very low power, but a thick rug on the other hand is probably way too dense a material for this app, so if sealing up any potential leaks doesn't cure its leanness.........

GM

[Godzilla]

>>> ...until TC PM'd me about the Japanese pipe horn.

Terry Cain would have done something wonderful with open baffle too if he were still around. His back horns are beautiful.

In larger rooms these little 4" drivers would not do well but in small living spaces and in corners they perform like giants in BIBs.

[timbarnes]

Originally Posted by Godzilla

Great extension for a 4"!

Hi Godzilla:
I've been trying for ages to access the BIB site listed in your signature - it seems to have been down for the longest time...

Did the URL change, or is there an error in your signature?

Thanks,
tim

[GM]

BIB calculator currently here: http://www.diyaudio.com/forums/attac...or_v1x.xls.zip

GM

[Vix]

Hi! Due to the change of accomodation (moving hi fi to another room) and due to some domestic considerations I will have to dismantle my OBs and think about building something so that everyone is pleased...At first I thought that I will be moving to a small room but after some discussion with Swmbo, she agreed to let me put the speakers in the living room under the condition that they are out of the way and not ugly. Since I recently purchased a pair of second hand CSS125fr drivers I thought about trying them in a BiB. They would be later supported by a pair of small sealed subs using Eminence Beta 15 and Linkwitz transform circuit...
To make long story short, has anyone built CSs 125 in a bib and is it worth it, or should I try something else?
btw, room dims. are 4.80m x 4.20m x 2.50m. Thanks, Vix

[chrisb]

Originally Posted by Vix

Hi! Due to the change of accomodation (moving hi fi to another room) and due to some domestic considerations I will have to dismantle my OBs and think about building something so that everyone is pleased...At first I thought that I will be moving to a small room but after some discussion with Swmbo, she agreed to let me put the speakers in the living room under the condition that they are out of the way and not ugly. Since I recently purchased a pair of second hand CSS125fr drivers I thought about trying them in a BiB. They would be later supported by a pair of small sealed subs using Eminence Beta 15 and Linkwitz transform circuit...
To make long story short, has anyone built CSs 125 in a bib and is it worth it, or should I try something else?
btw, room dims. are 4.80m x 4.20m x 2.50m. Thanks, Vix

I'd be very careful about running the CSS FR or WR125s in any type of BLH or OB without limiting LF extension - the motor has far more power than the suspension can handle. Based on my experience with them, over excursion is a lot easier to achieve than with say a Fostex, MarkAudio, Vifa, Peerless, TangBand etc., with very alarming results.

They work well in small sealed or aperiodic vented enclosures.

[Martin Prothero]

Can some wordsmith help me to identify over excursion? I have a pair of 168Z in a Bib I built a few years ago and I love em. I was using a DIY 2 watt SET but changed to a chipamp as I wanted to add a DAC to allow digital files.

With the new amp I'm getting an occasional sound I can't identify. It's only audible at higher volumes and with certain instruments. Particularly things like gloch or xylophone or steel drums. Very dense sounds at higher pressures and I get a sound a bit like someone opening Velcro added to the music!

Not nice, but I'm a bit worried I might be damaging something. Trying to trace if it is the amp flipping out or the drivers topping out?

Can anyone shed some light?