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Saburo's Vs. DTB
Saburo's Vs. DTB
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Old 24th December 2008, 07:26 PM   #21
Dave the bass is offline Dave the bass  United Kingdom
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Quote:
Originally posted by strider75
Looking good, Dave! I feel your pain in regards to the size of your work area, mines no wider but about a foot taller.

Keep the updates coming, I look forward to them.


Merry Christmas!
Thanks Mr Strider, Merry Christmas to you too matey.

Here's another update 'specially for you (!)

So, bright and early this morning the 2nd cab got glued up...
Click the image to open in full size.

...and then it was time to turn a spare 4'x4' 1/2 sheet of 18mm BP left over from the MLTL build into 130mm wide strips that in turn will be made into the horn guide pieces (or whatever they're called). It takes a surprising amount of time to do this without a table saw, in retrospect I should've taken the chippies up on their offer to do it for me but it meant a 43 mile round trip to Lundun Village (by the duck pond). With a good supply of 130mm wide pieces I started working out the internal sizes of the bits required (no easy feat in itself IMO) and then accurately routed them all square as these are all butt-jointed together between the cab 'walls'.

Would you believe me when I say it took nearly 3 hours to make the 130mm strips and these 8 pieces...
Click the image to open in full size.

At the end of the day the clamps came off the 2nd cab and 'Arfur' gets an identical twin...
Click the image to open in full size.

Getting there, slowly (but accurately!)

Christmas Day tomorrow, we've got a house-full.... I'm off to the shed then

DTB
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Old 25th December 2008, 09:01 AM   #22
Dave the bass is offline Dave the bass  United Kingdom
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...just waiting for everyone to fall asleep....then I can nip down the shed to do a secret bit of gluing.....ssshhhhhh...... <sneaks off out the back door>.....



DTB
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Old 27th December 2008, 10:19 AM   #23
Dave the bass is offline Dave the bass  United Kingdom
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Well, while you've all been busy a-stuffing yer tum-tums with grub I've been slaving away over a hot speaker cabinet!

Christmas day I managed to sneak off down the shed for a covert back panel gluing operation. Mission accomplished, the 2nd cab's back panel is now glued on.... came back indoors just in time to wave bye-bye to our guests

Boxing day meant a quiet day, phew. Off down the shed then. Making up all those little port-parts is a right pain in the bum as some of the bits are too small to be able to clamp and shape (square-off) easily so I popped down to B+Q and bought this...
Click the image to open in full size.
A belt sander, it was in the 15% off Boxing Day sale, raddy daddy. It's brill. It means I can cut fiddly little bits then sand them to the right size and to a precise 90 degree angle to make for a strong and accurate butt joint. (It wasn't dusty when I bought it BTW!).

I'm sensible (ish)...
Click the image to open in full size. (comes in handy when the family come round, I can't hear a thing...or smell 'em...)

Yesterday I managed to make all these port bits...
Click the image to open in full size.

...after drawing out the precise location of where they need to go inside the cab...
Click the image to open in full size.

...and I worked out a clamping technique to get each panel held in position whilst they drying....
Click the image to open in full size.

Next up are the 24 (!) deflectors....
Click the image to open in full size.
8 more to go then it's time for panel 'A' to be made which if the Fonken build was anything to go by will be a tad fiddly as it not only has to be square (natch) but also brace the magnet of the 126 tightly against the cab structure but without bending the pressed-steel speaker basket. Oh joy! ( I love it really).

Just had a coffee, back off down the (cold) shed. Flippin' 3.5 degrees in the Garden.

TTFN

DTB
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Old 27th December 2008, 08:16 PM   #24
Dave the bass is offline Dave the bass  United Kingdom
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..and so it continues...

Finally got all the deflectors cut...
Click the image to open in full size.

...which looks uncannily like a staircase to (aural) heaven when all four are placed side by side!
Click the image to open in full size.

And in position they look like this...
Click the image to open in full size.

The rest of the afternoon was spent marking out the rest of both cabs to make positioning each horn piece easier when they're being glued in.

A question though... how imperative is it to support/brace the magnet assembly? I know some details are given on page 2 of the Sachiko plans http://homepage.mac.com/tlinespeaker...1v0-230307.pdf but I'm wondering if with such a small driver its needed?

Any thoughts/comments? I'm wondering what to do here TBH as I'm worried the extra wood in the filter chamber might muck up the internal cabinet volume.

Thoughts?

Tired but happy with progress.

DTB
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Old 27th December 2008, 09:41 PM   #25
soundsinthestix is offline soundsinthestix  United States
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I did not put the magnet brace in mine and have not noticed any bad effects. I did put a small amount of felt on the rear of the CC.
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Old 28th December 2008, 08:21 AM   #26
Dave the bass is offline Dave the bass  United Kingdom
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Quote:
Originally posted by soundsinthestix
I did not put the magnet brace in mine and have not noticed any bad effects. I did put a small amount of felt on the rear of the CC.
Thanks for the reply Mr Stix,

Whats the 'CC' btw? You've got me stumped there

DTB
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Old 28th December 2008, 08:59 AM   #27
planet10 is offline planet10  Canada
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Saburo's Vs. DTB
Quote:
Originally posted by Dave the bass
Whats the 'CC' btw? You've got me stumped there
CC ] Compression chamber... we call it an air cabity now,

Personally i would endeavor to brace the back of the driver. This distributes the newtonion motion of the driver to more of the box, decreasing the likelihood of the baffle resonating (the weakest part of the box) and will improve downward dynamic range.

dave
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Old 28th December 2008, 09:10 AM   #28
Dave the bass is offline Dave the bass  United Kingdom
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Quote:
Originally posted by planet10


CC ] Compression chamber... we call it an air cabity now,

Personally i would endeavor to brace the back of the driver. This distributes the newtonion motion of the driver to more of the box, decreasing the likelihood of the baffle resonating (the weakest part of the box) and will improve downward dynamic range.

dave
Ahhh, so thats what CC means, thanks Dave.

Awwww, alright, I'll have another bash at the brace then. I'll post some piccies to make sure I've done it right before gluing the beasty in. It was the fiddlyest part of the Fonken build I undertook...hence my trepidation....

Cheers again Dave.

DTB
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Old 28th December 2008, 11:41 AM   #29
Dave the bass is offline Dave the bass  United Kingdom
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I'm persisting DaveD!

Now here's a bang-up-to-date shot of the Brace/part 'A'. It's easier than I thought TBH, I've made it a slightly different shape to how a brace was 'suggested' in the plans as it interferes less with the air-flow in the the Air Cavity (get me eh!) but still supports all the magnet area that the brace butts up against.
Click the image to open in full size.

That OK?

Looks funny I know but trust me its rock solid as there's 2 of these per driver.

In the cab it looks like this...
Click the image to open in full size.

I take it it's a good idea to drill big holes to allow the air to move through the braces as I did in the Fonken 'Holey Brace'???

DTB
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Old 28th December 2008, 05:55 PM   #30
planet10 is offline planet10  Canada
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Quote:
Originally posted by Dave the bass
I take it it's a good idea to drill big holes to allow the air to move through the braces as I did in the Fonken 'Holey Brace'???
Yes.

dave
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