29 replies to this topic

[greenie512]

Over a few glasses of red tonight Brisso57 suggested a project that might be a bit of fun. Build a rough and ready BIB in a day, not only that! but build 3, 4 or 5 of them with different drivers.

Now these boxes are dead simple, I have the table, circular and drop saws but in the time we couldn’t do glue joints so quick dry butt screw joints “there-and-then” most difficult thing is cutting the driver openings but I have routers/jigs and bits for that.

So I can throw in a pair of CSS FR126’s, Brisso57 a small pair of 4” drivers we need 2 or 3 more people with WR or FR drivers to make this a fun day.

If you don’t know what I’m talking about have a look at this site, you’d need to come along with drivers and dimensions ready to do the build – many hands make light work ….

http://www.zillaspeak.com/bib.asp

If we can get this going I’m thinking 6-8 weeks time my place (Chuwar/Ipswich SE QLD).



Picture linked from the above site; we will not have time to play with suprabaffles?

Edited by greenie512, 25 April 2009 - 08:51 PM.

[kye]

hi phil.. that sounds like a terrific idea and a tonne of fun - I wish I could be there!!!!

all the best with it...

oh, and there was another thread about backloaded horns recently where ehtcom recommended a 4" wideband driver from altronics that apparently isn't too bad - perhaps you can add that one to the mix as an underdog

[greenie512]

Brisso57 quote ... "We should include as many B's and I's as possible.
BIBBIBB - Brisbane/Ipswich Blockbuster BIB Bash."

[Brisso57]

If it would assist a potential attendee, I have a pair of Magnavox 8WR's in very good condition. I'd be happy to sell these for $10 on the day.
You'll need to do your own research re the appropriate BIB dimensions though.

(The 8WR's have a great tone, but need a supertweeter to add a bit of sparkle. I suggest adding a piezo, cap and L-pad to give adjustable sparkle.)

cheers

Doug

[Brisso57]

<SNIP>

So I can throw in a pair of CSS FR126’s, Brisso57 a small pair of 4” drivers we need 2 or 3 more people with WR or FR drivers to make this a fun day.
<SNIP>

I have a pair of "Holey Basket" Sony/Coral FE103A's that I'll build for. As an alternate I'll also bring along a pair of Sanyo "FE103A's".

Looking forward to it already!

Edited by Brisso57, 20 April 2009 - 12:26 PM.
formatting

[gz76]

If only this was in Melbourne! Sounds like a great, fun idea. I look forward to seeing how it all goes.

[Brisso57]

If only this was in Melbourne! Sounds like a great, fun idea. I look forward to seeing how it all goes.

It only needs someone with a table saw and a bit of undercover working space. I'm sure there must be SOMEONE who could put their hand up ...
Maybe it could happen on the same day as the Brisbane event.

c'mon Mexicans! ;-)

cheers

Doug

[gz76]

Well, that's definitely not me then. But, if someone else wants to organise something down this end of the country I might be interested in attending.

[doobius]

This sounds like a fun day. Provided I'm in Brisbane I'm keen. There's a chance I could be in Sydney around this time but won't know for sure until the boss gets back from holidays in a couple of weeks.

P.S. This is a very generous offer Phil - many thanks. I'm about 90% sure I can attend.

Edited by doobius, 21 April 2009 - 07:55 AM.

[Listener]

Phil.

Sounds like fun, so count me in.

Just where I will put the things though? Maybe have them in the bedroom with lights in them?

Do we bring our own wood or are you going to get some cheap stuff from that place in Ipswich and we can pay you.

Are we allowed to pre-cut some parts?

Steven.

[greenie512]

Phil. - Sounds like fun, so count me in.
Just where I will put the things though? Maybe have them in the bedroom with lights in them?
Do we bring our own wood or are you going to get some cheap stuff from that place in Ipswich and we can pay you.
Are we allowed to pre-cut some parts?
Steven.

Hi Steven - I’m quite happy to order in sheets of MDF to be dropped off to me by my supplier and this’d be about $36 per sheet of 18mm board (but let me confirm the price later?). Alternatively, I can get in some sheets of “seconds” ply but obviously the quality will vary and to be honest it’d cost (almost) as much as the MDF. If you want me to order in the materials let me know how many sheets you’ll need of your BIB – remember to allow for the cock-up factor – we’ll be moving pretty fast to get these knocked up.

The whole idea to start from scratch, so I’m going to say it’d be a bit of a cheat to pre-cut before the day. If we got a lot of people involved then yes that may be necessary but I don’t think we’ll be queuing too much for the table saw.

I know you’ve got a heap of driver but non are full range which drivers were you thinking of using.

I’ll organise materials etc once we know we have a definite day and people have had time to decide on their drivers and BIB solution and I’d ask those coming to prepare a dimensioned cutting schedule just to back this up. Also if we go down this route I’ll ask for prepayment of these materials, just in case people don’t turn up! I don’t want to be out of pocket. But if you want to cart your own materials over that’s fine with me.

I’ve also got another little design comment about the BIB’s but I’m staving so that’ll have to wait for an hour or two while I have dinner.

[Listener]

Phil.

I have not got round to driver selection yet.

This time from a reputable dealer though!

18mm MDF would be fine. I guess a sheet each to allow for stuff ups?

Steven.

[greenie512]

Now I’ve eaten I can think straight again.

I had noticed a couple of comments on diyAudio about the restricted space behind the driver in the BIB. And when you think about it – roughly you have half the depth of the cabinet cut diagonally by the internal baffle. Which very roughly gives you less than a quarter of the cab depth for the driver – yikes that’s tight.

Now I’m going to use the CSS FR125 driver which is 75 mm deep front-back. I’ve just done a rough drawing of the specified BIB for this and it look like I have around 77-80 mm space (tight hey).

Now I was wondering why most of the pictures on Godzillas site http://www.zillaspeak.com/bib-pics.asp had some form of suprabaffle – now the large ones I can understand but those silly little ones less than the width of the baffle “seem” pointless – NO – they are there to bring the driver forward and avoid the “squeeze” at the back.

Therefore, this little guy may take time to cut. So I’m going to say that if you think you need a little front baffle to bring your driver forward – make this before you come.

[Brisso57]

I had noticed a couple of comments on diyAudio about the restricted space behind the driver in the BIB. And when you think about it – roughly you have half the depth of the cabinet cut diagonally by the internal baffle. Which very roughly gives you less than a quarter of the cab depth for the driver – yikes that’s tight.

Now I was wondering why most of the pictures on Godzillas site http://www.zillaspeak.com/bib-pics.asp had some form of suprabaffle – now the large ones I can understand but those silly little ones less than the width of the baffle “seem” pointless – NO – they are there to bring the driver forward and avoid the “squeeze” at the back.

The other way to fake it is to make a suprabaffle the same size as the front baffle - ie go double thickness. The hidden panel can be anything cheap, say chipboard. The front panel can be more decorative. You could - for arguments sake - use a real wood plank.

cheers

Doug

[Brisso57]

Phil.

I have not got round to driver selection yet.

This time from a reputable dealer though!

Steven.

Hi Steve,
May I suggest the Visaton BG20? It'll give you some bass, and a pair would be pretty cheap.
The calculated BIB dimensions are on DIYAudio. Just search.

Doug

[Brisso57]

Hi Phil,

I managed to scrounge up some estimated/measured TS data for my Peak 8CX50's.
When I fed them to the BIB spreadsheet, I get ...

86" tall
20.5" deep
14.5"wide

wowsers! ... MONSTERS!

WAF factor zero!

:-)

Doug:biggrin:

[Listener]

Hi Steve,
May I suggest the Visaton BG20? It'll give you some bass, and a pair would be pretty cheap.
The calculated BIB dimensions are on DIYAudio. Just search.

Doug

Doug.

I am thinking of using these.
http://darcheraudio....products_id=121


A bit expensive, but should give a good result.

For the box I may go with this.
http://markaudio.com.../alpair-10-mltl

Easy to build in the day, big but not too big.

Steven.

[doobius]

Fostex FE127e for me

[greenie512]

Okay, so it looks like we have four builds

• Greenie512
  
• Brisso57
  
• Listener
  
• Doobius

Lets pin down a day, if Listener is still to order drivers lets give it four weeks. How about Sat 30 or Sun 31 May - whats best for you?

[Mick35]

I'm a carpenter by trade if that helps:D

I don't own a table saw though wish I did

I'd wouldn't mind tagging along although I don't have room for the Monster speakers just learning and help building would be what I could offer.

I'm good at cutting stuff

[greenie512]

I'm a carpenter by trade if that helps:D
I don't own a table saw though wish I did
I'd wouldn't mind tagging along although I don't have room for the Monster speakers just learning and help building would be what I could offer.
I'm good at cutting stuff

Hi Mick - your quite welcome, always good to see a new face. I have all the gear but another set of trestles would be handy to create another work surface, power drills/drivers/bits always useful.

PM me your email and I'll send you the address and mud map.

[doobius]

How about Sat 30 or Sun 31 May - whats best for you?

That weekend should be ok for me Phil.

[Brisso57]

If there's anyone contemplating joining in but needs a driver idea ... what about a HiVi M6N? It'd need a (super)tweeter, but you could still claim it as a BIB, I think. You might be able to use a (padded) piezo if you ran the M6N full range. Cost would be OK.

The M6N specs are here:
www.parts-express.com/pdf/297-441.pdf

but you could buy a pair from Darcher if you wished.

cheers

Doug

[Brisso57]

That weekend should be ok for me Phil.

I'll check with SWMBO.

cheers

Doug

[greenie512]

Hey Bisso57 - you came up with the idea - put your foot down with the better half this time. It's official BUILD DAY is Saturday 30th May doors open 8:00 am.

No time to fart around with lunch bring your own etc.

[Brisso57]

Hey Bisso57 - you came up with the idea - put your foot down with the better half this time. It's official BUILD DAY is Saturday 30th May doors open 8:00 am.

No time to fart around with lunch bring your own etc.

OK. I'll go out on a limb. See y'all on 30th May.

I'll bake us a cake for smoko!

Doug

PS I'm giving some thought to the most efficient* way to cut and assemble. I'll convey the conclusions in a future post. (Time-efficient, not timber-efficient.)

[doobius]

[rob323]

I have noted the date in my calendar, but depending on whether I am rallying the following weekend will determine whether I attend and be a public nuisance or not .

[Brisso57]

Well the BIBBIBB went off according to plan with 3 BIB's and a MLTL knocked up in one day, at one shed and by six guys: 4 builders and two helpers.
I built a pair with vintage (black version) FE103A SONY/Coral "Holey Baskets". (pictured)
Greenie built a pair using CSS FR125ST's.
Pete built a pair using Mark Audio CHR70's.
Steve built an MLTL using a pair of Mark Audio CHR170's.

Much noise, sawdust, cursing of mistakes... and fun.

A very productive day with much learned all round. 6 guys who now have a little better understanding of what the fuss is about with BIB's.
I think we all began with our BIB's overstuffed. Mine certainly was.

Now for few weeks of tuning ...

cheers

Doug

[kye]

great stuff doug - glad to hear this happened and all went well

you'll have to keep us informed of your opinions as you get to know the sound of the speaker and tune it to perfection