Breaking In
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
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
Re: Breaking In
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.
BenjaminWebber said:
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.
try this instead
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.
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.
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
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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
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.
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
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
Re: Date set for the Int'l Build-a-BIB Day!
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
Brisso57 said:
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
>>> 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
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
I have the Coral 4a-70 details here...
A fellow forum member ran them and got these figures, I hope it is helpful!
A fellow forum member ran them and got these figures, I hope it is helpful!
coral 4A-70 project - photo of boxes 1
hi,
went to visit bib's and took snap; 25mm black stained ply (donated) awaiting routing of driver hole; stands to bring driver to ear height in conceptual stage...
so, as it was suggested earlier that the mouth should face the floor to load the line - is the distance of the mouth from the floor more important than the distance of the driver from the floor?
thanks,
adam
hi,
went to visit bib's and took snap; 25mm black stained ply (donated) awaiting routing of driver hole; stands to bring driver to ear height in conceptual stage...
so, as it was suggested earlier that the mouth should face the floor to load the line - is the distance of the mouth from the floor more important than the distance of the driver from the floor?
thanks,
adam
Attachments
A weird idea ...
From another thread ... considering up/down firing drivers, and then omni-directional speakers ...
developing the omni-directional theme ...
What if one were to configure an internally-partitioned tower as shown?
Let's dub it the "Quad-BIB" - the idea being that 4 BIB-style compartments standing together?
(Leave aside the size implications!)
If one were to use (say) WR125ST's, and kept to the calculated L and Z, what would the effect be (sonically) in squashing the X-section to make a reasonably-sized and aesthetically-pleasing compound cabinet?
cheers
Doug
From another thread ... considering up/down firing drivers, and then omni-directional speakers ...
developing the omni-directional theme ...
What if one were to configure an internally-partitioned tower as shown?
Let's dub it the "Quad-BIB" - the idea being that 4 BIB-style compartments standing together?
(Leave aside the size implications!)
If one were to use (say) WR125ST's, and kept to the calculated L and Z, what would the effect be (sonically) in squashing the X-section to make a reasonably-sized and aesthetically-pleasing compound cabinet?
cheers
Doug
Attachments
Re: coral 4A-70 project - photo of boxes 1
Yes since without good pipe loading there's no driver protection below ~0.707x its Fs.
GM
arustyrednail said:
Yes since without good pipe loading there's no driver protection below ~0.707x its Fs.
GM
"Sorry, not able to visualize it in 3D."
I second that. The pic isn't doing much for me.
What's your thought , one driver on each of the four sides ? 4 drivers at 90 degrees to each other for a nice , comb filtered output ? 😉
...............................Blake
I second that. The pic isn't doing much for me.
What's your thought , one driver on each of the four sides ? 4 drivers at 90 degrees to each other for a nice , comb filtered output ? 😉
...............................Blake
coral 4A-70 project - sound absorbing stuff
hi,
thanks, gm;
and in other news:
by happy coincidence met an aquaintance who has returned to town and now works for www.allproof.co.nz - purveyors of all sorts of sound attenuation panels, foams, rubbers and associated materials.... applications for factories, studios and listening rooms.
had been looking at overseas suppliers of various products, very pleased to have an auckland contact for that sort of thing - Kerry Adams is the chaps name, music production background, audio enthusiast.
should make tuning the bib a little easier with a range of panel damping and stuffing stuff to try,
thanks,
adam
hi,
thanks, gm;
and in other news:
by happy coincidence met an aquaintance who has returned to town and now works for www.allproof.co.nz - purveyors of all sorts of sound attenuation panels, foams, rubbers and associated materials.... applications for factories, studios and listening rooms.
had been looking at overseas suppliers of various products, very pleased to have an auckland contact for that sort of thing - Kerry Adams is the chaps name, music production background, audio enthusiast.
should make tuning the bib a little easier with a range of panel damping and stuffing stuff to try,
thanks,
adam
Perhaps a single driver, up-firing, on top of a filter chamber with output in the narrowest end of a straight iBIB would do better for that.
Thinking in something like an FE108ESigma...
Gastón
Thinking in something like an FE108ESigma...
Gastón
Re: Re: A weird idea ...
The diagram was intended as a plan view of 4 BIB's stacked together - "marching in a circle" as it were.
The inspiration came from consideration of mention made by Dave (@P10)
in this thread:
http://www.diyaudio.com/forums/showthread.php?s=&threadid=145589,
"Sonotube FR speakers".
Dave made reference to EPI miniTowers, which were omni speakers, with a driver on each face.
My comment arose thus ...
Clear?
The implied benefit was an omni arrangement with good bass.
Doug
GM said:
The diagram was intended as a plan view of 4 BIB's stacked together - "marching in a circle" as it were.
The inspiration came from consideration of mention made by Dave (@P10)
in this thread:
http://www.diyaudio.com/forums/showthread.php?s=&threadid=145589,
"Sonotube FR speakers".
Dave made reference to EPI miniTowers, which were omni speakers, with a driver on each face.
My comment arose thus ...
Clear?
The implied benefit was an omni arrangement with good bass.
Doug
If I understand you correctly Briso, why not make the first expansion of the BIB the tower sides and then the centre could be the combined mouth halves or if you like the combined expansion after the bend. Have no idea what it would sound like though.
jamikl
jamikl