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

You all speak words of wisdom my friends.

Back onto the subject of cabinets, I've been looking at different ways to approach the BIB & I've got a potentially new twist. I need to look into it a little more but it could be interesting. Same geometry; not as easy to build, but could improve linearity. I'll let you know exactly what it is soon.
 
One of my Fostex 127e has died. We had 14 kids under 9 years old at my house for a birthday party and the very next day all that came out of one speaker was a mess of distortion. So I will be placing a Madisound order for a replacement... while i'm buying i thought i'd buy another pair of drivers.

It's a toss up between the 167e ane the 165k. I will be swapping them in and out of either a BIB or Straight Pipe (that's bigger than spec) and was wondering if anyone had any thoughts on these two drivers. I'm sure they are both great but am hoping for some listening impressions.

Which one sounds warmer and more relaxed? I will be using super tweeters with both.

TIA,
Godzilla
 
Hi Scott!
I'll be much interested what you come up with. I've just found a joiner which can supply a three layer of birch panels. I'm thinking of my Sonido's, which build has been delayed due to a S&*t load of work at my profession. I'll be happy to try out anything you come up with!

Best regards
Peter
 
Warmer and more relaxed? FF165K is your driver Jeff. Xmax is a bit limited, but I never had any distortion problems in my boxes, and I gather no-one else has. TC rated this combination I believe. You get a more liquid presentation thanks to the lack of whizzer & it's better in small spaces, not that it has a problem going loud when required. I still remember listening to Nights in White Satin on loop, getting progressively louder. Presentation was stunning.

Peter -those Sondios are the ones with the wooden phase plugs, right? Should go well in those boxes I modelled a while back. Nice units, or they look like they are.
 
Has anyone here had comparison experience with the FE108EZ's and the bigger drivers?

I'm running a little shorter on funds than I first thought...might not have the $280 for a pair of 168EZ's. But I listen to rock and orchestral music a lot, and a little voice is telling me that I won't be happy with 4" drivers 😱

Am I wrong to think this?
 
Hi Glowbug!

In my opinion for what it is worth...(I have the fe108's in a BIB enclosure) it is a beautiful driver! It is delicate, fast, has a really lovely tone to it and is totally ok with highs. It CAN sound 'leaner' but I don't know if that is the drivers fault or my implementation or just what I'm used to hearing. As Scott and some others here have suggested, I think a bigger driver would be better in the BIB, if that is the direction you want to go. I believe the dip in a fe108 BIB, is in a place where it is more easily heard compared to the fe167 etc. And if you want deep bass with the fe108, you will need a sub too, just like Terry Cain implemented with his version. Which from what I understand you definately don't need with a bigger driver.

I am going to build the Harvey for the fe108's in the near future as it seems it is more optimal for this sized driver. I'll keep both enclosures and will compare, which will be fun!

Please, if people don't agree with what i've suggested I won't be offended!

Stroop
 
I don't think he did get a huge amount of bass out of it. Solid to about 70Hz, F10 about 40Hz, give or take. Adding a high reistance cable extends that a little. I have a little inside information on Abby. I can't go into it as I was told in confidence, but suffice to say Abby is not quite what it looks on the outside. In all honesty, it's not the way I'd choose to design an ML TQWT, but plenty of owners seem happy. Luckily this lack of LF is about the last thing you're going to worry about with them BIB loaded. 1/2 wave tuning to a desired frequency has it's benefits... 😉
 
😉 Bless him.

I liked Terry a lot, respected him greatly & will always miss his contributions & our occasional emails. But he wasn't exactly the most consistant bloke I ever met. In fairness, I remember GM pointing out on the original FR forum (I think), that a resistive piece of wire doesn't work in quite the same way as a ceramic. But that still scuppers old TCs argument a bit, because it doesn't change the fact that it's still deliberately altering the driver parameters!
 
Greets!

Yeah, this whole tube amp Vs SS amp cum filter philosophy thing doesn't make much sense since a typical tube amp is one big multiple EQ ckts. ganged together with distortion levels that rival drivers, so all we're really 'debating' is the SQ/relative merit of various distortions.

Since SS high power, decent caps, resistors, inductors are all relatively cheap and most important to me, long lived/maintenance free, this power line format combined minimizing driver distortion has been my 'no brainer' choice since 1970. That said, the most life-like reproduced vocals I ever heard was from a ~10 W SET tube amp direct coupled (no OPT) to a huge W.E. compression horn, but not having been able to try it my way I'm not convinced the power line part is the Holy Grail of electrical-mechanical-acoustical synergy, but it's for @#$% sure a lofty performance benchmark.

GM