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

[BenjaminWebber]

I have not done it, but I read on one forum where one guy fastens the two new drivers so that they are facing and touching each other. He wires one of the two drivers correctly, and the other out of phase. This way they don't sound like they are playing very loud, even though they are.

Sincerely,

Benjamin

[loninappleton]

Originally posted by BenjaminWebber
I have not done it, but I read on one forum where one guy fastens the two new drivers so that they are facing and touching each other. He wires one of the two drivers correctly, and the other out of phase. This way they don't sound like they are playing very loud, even though they are.

Sincerely,

Benjamin

Yes that is a known technique. You check for phase using an AA battery with two leads from the speaker. In phase, cone pushes out,
out of phase cone goes in. Then wire it that way to the amp. When you mount them face to face you'll still want a sound proof box and lots of stuffing in it.

Some free audio programs like Audacity have built in tone generators.

I found some clips here:

http://www.burninwave.com/#pinknoise


Last time I did the break in I took a 30 second clip of the noise in Audacity and then let it play with VLC in a loop. I do not have any scope equipment or tone generators. This is the simplified way.

[loninappleton]

here is a discussion from DIY audio.

http://www.diyaudio.com/forums/showthread/t-100945.html

The info seems to be better,

Full disclosure, I haven't used any of these.

[GM]

Originally posted by loninappleton

When you mount them face to face you'll still want a sound proof box and lots of stuffing in it.

I just throw a thick blanket over them.

GM

[nikolas812]

Well. I've been applying everything you guys were telling me. They seem to be coming around quite quickly.

When I got them they had enough stuffing in them to fill a 30 gallon garbage bag.

I took all that out and thats when I finallly started getting some real bass.

So in fear of losing my bass again. I only used a minimal amount of stuffing to try and control midrage reflection. I put a little in the bottom. A little above the speaker and a little behind and below the speaker.

I put them in a wider room closer to the corners.

Toed them back out quite a bit. Almost no toe in at all. I had to have a little or they won't image.

I have also went from KT88's to EL34's in my amp.


So far it sounds pretty good. Still not quite as good as hoped. But I thnk there is more to be had. I have a bunch of acoustical panels. I am going to mount one to the ceiling above each speaker. This should cut out 90% to 100% of any reflective sound comeing out of them. I layed them on top of the speakers just to get an idea. It was the most dramatic tweak yet.

I am hoping the panels will be the last tweak. Some one told me I would have to tweak these forever before they would come around. I had no idea.

They also seem to be warming up as they break in. I had them running for about 3-4 days 24hours a day. I couldn't take it anymore and had to turn it off. So now they get a little break in time during the day.




Nick



[IMG][/IMG]

[loninappleton]

Depending on what sort of neighbors you have if any, I found the ideal solution was to fire up the break in when I leave. This precludes having a garage or someplace where the break in is out of hearing range.

[nikolas812]

Thats pretty much what I have been doing....





Nick

[Alex from Oz]

G'day Nick,

A helpful idea to assist with break in is to move the speakers face to face and reverse the + and - wires on ONE of the speakers.

This will reduce the level of bass because they will be running out of phase.
Do one day like this, then swap the wires back and reverse the + and - wires on the OTHER speaker so it has a turn playing backwards for a day.

Some blankets thrown over the top might be helpful too.

Cheers,

Alex

[Brisso57]

Originally posted by Brisso57


30 May has been agreed by the SE Qld (Oz) participants.
I'll have my camera there and no doubt the pics will appear on Greenie's site.

Doug

Well the Build-a-BIB-in a-day day went off well. See

www.stereo.net.au/forums/showthread.php?t=13921

amd also

www.greenie512.net/greenie512/html/bibbib.html

[Godzilla]

>>> www.greenie512.net/greenie512/html/bibbib.html

WOW! I wish i was there! 4 new pair of lovely speakers to enjoy! Fantastic! I bet they all sounded good but different. Like 4 different beers from fine micro breweries.

Godzilla