Terry Cain's BIB -why does it work and does anyone have those Fostex Craft Handbooks? - Page 406 - diyAudio
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Old 11th May 2008, 09:13 AM   #4051
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Location: Yakima, WA
Default 208/T90A BIB with Different Amps

One of the nights this week, I put on a CD. I went with RCA Victor Van Cliburn Collection of 4 of Beethoven's Sonatas because every one was sleeping in my house. It was a grand musical experience! I thought my old pipes did pretty good with a piano, but with the BIB's it sounded like the Steinway Grand was at my feet with the lid open, not the very small old piano in my bedroom. I did not feel any inclination to move the speakers or adjust anything. I just could not believe how good it was. I was not bored at any time, and the music penatrated my soul, as happens once in awhile.

Yesterday, I finally got around to trying the BIB's with my Sonic Impact amp. I did the basic mod to the SI some time ago of replacing the "bass limiting caps" with a pair of Audio Cap Thetas and bridging a couple resistors. The mod was VERY worthwhile, but I had not used it for many moons, since one of my bosses gave me a Cary Rocket 88 for some work I had done. At first the SI sounded "raw" and much less "refined," but once it got warmed up a bit, it was REALLY amazing. I could go on, but I will try to be short. I put the Cary back in, but am glad I have the cheap SI. Though its bass is not as deep, it is MUCH faster. Also the treble sounded really rolled off when I put the Cary back in. I guess I love them both, but it made me realize that if I was trying to finalize certain things about my BIB's that the amp could influence a lot of things (i.e. speaker placement, cap values, resistence etc). I started moveing the BIB's around again, and realized that I had made the with the Cary sound more like what it sounded like with the SI.

I am curious what people who have tried various amps with these speakers think the ultimate match for the BIBs would be. I would really like to try a bottlehead amp, but don't know if I should save for the Paramount, or try the S.E.X. amp.

7/10ths, are you going to VSAC? I have never gone, but may try to at least go for one day.

Sincerely,

Benjamin
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Old 11th May 2008, 09:57 AM   #4052
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A DIY First Watt F3 or the F4 with a good high-gain preamp or squeezebox would be my choice. They don't need the current-source F1 or F2.
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Old 11th May 2008, 04:09 PM   #4053
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My choice of amps is the $130 SI Super T-amp. It has all of the proper mods built in and at least half-way decent banana and RCA jacks. There are better amps, but not by much. I use this amp to drive Lowther DX2's and various FE series drivers. Since I have gone to a computer front end, I don't need any filters or series resistors. A few clicks on the equalizer and all is well.

Bob
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Old 11th May 2008, 04:39 PM   #4054
gnugear is offline gnugear  United States
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I have a Pirmaluna Dialogue integrated amp loaded with V-caps and it's great. But I recently got Bottlehead 2A3 Paramounts and an Extended Foreplay (also with V-caps) and the sound is much fuller and more realistic. The sound is phenomenal with my Lowther DX4 Bibs.
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Old 11th May 2008, 07:35 PM   #4055
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Benjamin,
Do you get into the city often? You are welcome to give my S.E.X. amp a trial if so. I could probably live without it for a week or so .
It might also be interesting to send a GC with you if your so inclined...
I'll look into going to VSAC.


sincerely,
7/10
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Old 12th May 2008, 05:56 AM   #4056
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Default Thanx

I thank all of you guys! Much to investigate, and much to think about!

7/10ths, That would be cool. You could try my Cary Rocket 88 too, but I live in Yakima. I still don't know if I will go to VSAC. A great guy, and audiophile that I sometimes work for ordered the materials so I could build the BIBs. I have worked some of it off, and given him a little, but I wanted to have him paid in full before I spend any more money on my audio greed. I have not ruled out doing the one day thing on the Saturday, however.

Sincerely,

Benjamin
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Old 23rd May 2008, 04:41 AM   #4057
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Default gotta keep the bib thread going

No posts in here for a few days.

I'm planning my next bib for the FE127e. I'm pleased with the
one I made but there is a small tweak needed in the cabinet.

I found that flush mounting the driver reduced the depth to the point where the driver wouldn't mount.

So at the divider I want to put a spacer-- just 3/4 scrap-- to move the divider back far enough to avoid any rebuild dilemmas.

I had to take my bib apart and fuss with the front baffle and re-glue everything. The result with flush mount is very pleasing. And I trimmed out the front baffle to make it look more like furniture.

While I can't imagine that not having a pointy peak is going change much (it's stuffed tight above the driver), is there any opinion on this?
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Old 23rd May 2008, 04:20 PM   #4058
GM is offline GM  United States
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Stuffing or not, it will increase (the Q of) the already theoretically deep 3rd harmonic dip along with all its harmonics, which should be audible, though don't have clue whether it will be better/worse or just different sounding in-room, so Caveat Emptor.

Anyway, that's a lot of work, I would either just hog out the existing driver cutout and add a false baffle to mount the driver or cut a clearance hole in the internal baffle and make a cover out of some 1/4" BB ply or similar.

GM
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Old 23rd May 2008, 07:50 PM   #4059
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This is not the rebuild. I am starting fresh on a second bib.

Don't know about the harmonics. I never play at high volumes.

And I don't want to double up the front. I tried a suprabaffle
on the old bib and wound up taking it off.

This mod is done with cheap materials and I think it's worth trying.

ABC measurments will be the same. I'll have to adjust the
depth a bit for area.

6 3/4 in width to match what I have.
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Old 31st May 2008, 07:24 PM   #4060
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Quote:
Originally posted by loninappleton
This is not the rebuild. I am starting fresh on a second bib.

Don't know about the harmonics. I never play at high volumes.

And I don't want to double up the front. I tried a suprabaffle
on the old bib and wound up taking it off.

This mod is done with cheap materials and I think it's worth trying.

ABC measurments will be the same. I'll have to adjust the
depth a bit for area.

6 3/4 in width to match what I have.

I am making my own followup here with a variant on the info above.

If a double baffle front is used (and I manage to get the hole,
flush mount and chamfer done without error so I don't need the extra piece) how does the extra depth effect the BLH?

If, as I have previously done, the outer baffle is made to the
driver cutout diameter and chamfered and then the inner baffle is cut either the same or to the next largest hole size and chamfered
how does this wave guide act with the horn? Which is better-- less wave guide (narrower wave path) or more wave guide (expanding rear wave path?)

All I can say is that this effect using a suprabaffle on a BIB in my initial outing with that style did not give a desired effect: good soundstage etc.

Maybe GM can help with the theory on this.

This baffle would not be an issue if the driver fit right and had clearance with the use of flush mounting.
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