Terry Cain's BIB -why does it work and does anyone have those Fostex Craft Handbooks? - Page 414 - diyAudio
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Old 29th June 2008, 01:58 PM   #4131
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Hey Scottmoose
I would like to stay under $250.
I have built about everything else
with fostex,recently built saburos 126e, great soundstage,
the bass region is very boomy and undefined.
otherwise I could live with these forever.any thoughts Scott.
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Old 29th June 2008, 04:02 PM   #4132
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Saburo should be neither boomy nor undefined. If they are, there's something wrong that needs sorting out. Like now-ish.

OK, this is the BIB thread, but this is something that needs adressing, so I know the guys will forgive a brief OT while I try to get them working for you. What's the build material, exactly how have you damped them, where are they in the room & what amp are you running?
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Old 29th June 2008, 05:37 PM   #4133
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From above, I'm interest in this too-- the boominess issue.

Newest BIB does not have a pennant made for it as yet.

The position of the cab is closer to the wall-- maybe too close--
for my rather cramped environment.

I've tried various positioning things and it's like dancing with a dump truck to try to move it.

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Old 29th June 2008, 11:09 PM   #4134
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Lon,

Perhaps your tuner has a weaker output on one channel than the other ?

My old Sherwood receiver has that problem. Seems to have happened after a particular bad storm.......

If all other inputs seem to be of same strength/output regarding left vs. right channels, I would suspect the tunner circuit.

I'm sure 2 different cabs could be affecting the soundstaging .

I have found changing the toe in/out and distance between cabs has dramatic effects on soundstage . Have you tried changing distance between cabs ?

For reference, I am using OB's, so perhaps they are a bit more sensitive to placement.


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Old 30th June 2008, 12:16 AM   #4135
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Nihilist,

Yes, I built the second BIB to stand them both up together.

But I don't want to give up the MLTL.

Sooner or later I'm to going to stand them both up and put on
an HD webstream of classical afternoon concert.

BIBs need a fair amount of taming, whether it's placement or tweakage.
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Old 30th June 2008, 11:32 AM   #4136
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Hey Scott
I am sorry for the delay in getting
back to you,a full day on the go yesterday,
anyway I have been using DIY paradise Charlize amp,
It could be I had saburos to close to side walls.
I just got an onix tube amp a few days ago.
maybe I need to give them a try with that.
as far as dampening goes I am using wool felt pads
1/4 inch stuff on the back and bottom of chamber.
as far as material I used beautiful maple ply no voids.
build is absolutly spot on,it is hard to explain it is
like they just can't seem to get the low notes correct,
almost like they are tuned to the wrong frequency.
going from these back to my Buschhorn MK2 with fe108ez
the buschhorn sound so much more refined,if I can't
get these sounding right I might build frugels for fe126e
spoke with dave about this recently.

Scott
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Old 30th June 2008, 11:52 AM   #4137
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This type of enclosure don't like being within ~3ft of side-walls unless you toe them in signficantly, and they're not overly fond of small rooms. Unlike the Bushhorn / frugel-horn etc., Saburo is a high-gain design, so if the room is quite resonant / lively it will also exacerbate this.

The damping you currently have is insufficient. Shift to ~3/4in thick wool felt, top, rear, & bottom of the low pass filter chamber, and the first 12in top & bottom of the first path to the rear of the cabinet. Adjust by damping one side-wall of the chamber should you need more, or a lining the path just above the final forward flares with the same. One thing at a time though.
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Old 30th June 2008, 12:02 PM   #4138
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Hey Scott
I will give that a try,I spoke with a guy named Derek
a while back another guy that built these as well,
and he was using nothing but a small bag of lead shot
laying in the bottom of chamber,that did'nt sound right
to me,
where do you think I can find 3/4 wool felt.
heading off to work talk to you this evening.
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Old 30th June 2008, 02:58 PM   #4139
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Hey all -

Here are my heavily modified 126e BIBs, based on the upthread discussions about asymmetrical baffles and measured vs. claimed specs. Lovin' 'em, thanks for all the discussion.

Link to pictures and description
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Old 30th June 2008, 03:10 PM   #4140
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Quote:
Originally posted by bigaudioscotto
Hey Scott
I will give that a try, I spoke with a guy named Derek a while back another guy that built these as well, and he was using nothing but a small bag of lead shot laying in the bottom of chamber, that did'nt sound right to me, where do you think I can find 3/4 wool felt.
Different rooms, different systems = different requirements.

Not sure on the felt -I live in the UK, not the US. Try a carpet warehouse for underlay, or just laminate a few layers of your existing material together.
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