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AKAI SW-35 - Barn find rebuild
AKAI SW-35 - Barn find rebuild
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Old 22nd February 2017, 03:31 PM   #1
ricardo1e93 is offline ricardo1e93  Portugal
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Location: Portugal West Zone
Default AKAI SW-35 - Barn find rebuild

Hello and good afternoon!

As mentioned in the tittle, I'm restoring a very old pair of back loaded horn cabinets form the... 70īs? I didn't found any precise date from when they're were originally built but still, I only know I got them with this lot of empty and incomplete cabinets for a true bargain.

You can see them on top of my custom build 2way speaker behind those Logitech Z4 satellites.

Click the image to open in full size.
https://s25.postimg.org/jepcmwqdr/SAM_0056.jpg

I couldn't stop noticing that one of them when I shook it up sounded like it had a pile of stuff inside it. Since both of them didn't work (and were sold as so) I had to disassemble. Both of the plastic squarish rings where broken, one of them I barely touched it and the thing fell of. Also, one of the alloy pieces had a rip on them so I supposed that one has been opened before for repair of something.

I opened that one who had stuff inside and...
My suspicions of a mouse nest became reality.

Anyways, the cabinets had different speaker units, one with an Akai 12F-35 and the other with a 12B or 12H 35... I can't recall but they look very similar as fostex FE103EN but with a dark grey paper cone and dustcap, not inverted suspension.

12F-35
https://s25.postimg.org/xuzqz09lb/$_57_(1).jpg
https://s25.postimg.org/s5jiep3f3/image.jpg

Then I opened the other one which had the same speaker I've shown above, with was kind of repaired, the speaker had it's suspension glued all over the place and we could notice that it had some holes on it. The speaker is pretty much dead and in really poor shape, I tried to make it work but only make grrrrsshhhh and I could barely understand the music that was played.

I plan to do a rebuild or better say an overhaul of these, principally changing the front design and the wood textured plastic... casing? Sorry but I don't know which word is the better I want to put a brighter one.

I also need to get some full range speaker for it and it is here that I need some piece of advice form your experience with this type of alignment. I would love to get some fostex but they're ludacris expensive for me.

I was thinking Dayton Audio RS100 or TB W4-655 or similar in the same price range or cheaper. What do you guys think? Note that I've never worked on this kind of alignment so I may be choosing the completely wrong speaker for the use.

PS: I need to upload some picture as soon as I get home

Last edited by ricardo1e93; 22nd February 2017 at 09:18 PM.
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Old 22nd February 2017, 08:10 PM   #2
EricAuer is offline EricAuer
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Cool project.

I like old Akai gear a lot.

Can you post a picture of how they look on the inside?

Thanks.

Eric
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Old 22nd February 2017, 09:42 PM   #3
ricardo1e93 is offline ricardo1e93  Portugal
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As asked and promised here goes.... and the nest goes to.

I want to apology the not very sharp picture, captions are taken directly from videos I recorded.

Click the image to open in full size.
Click the image to open in full size.
Click the image to open in full size.
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Testing the speaker...

Click the image to open in full size.
Click the image to open in full size.

The thing works surprisingly well! Then I make a quick fix inside the other box with less dirt on it to test that one 12F-35C and my jaw dropped! This thing goes to a little bit lower then 50Hz without a hitch!

About the inside of the box. For what I saw and then looked on the internet, these SW-35 look like a "face-lifted" version of the SW-30.

Click the image to open in full size.

As seen in AKAI A&D SW-30
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Old 22nd February 2017, 09:44 PM   #4
toulou is offline toulou  Greece
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Yes! Do post a picture of the inside... cause I'm too lazy to tear mine apart

...which are in pretty good working condition, with dark grey paper cones for sure. Sound-wise quite mediocre, with limited bandwidth but, you know, paper cones can be polite and enjoyable in the midrange for background listening.

Are you sure they are back-loaded horns, or just slot loaded bass-reflexes?
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Old 22nd February 2017, 10:10 PM   #5
toulou is offline toulou  Greece
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Oops! You posted while I was typing.
So, they are more than a box with a slot at the bottom.
Surprised about those 50Hz though, to my ears they do not sound they go that low.
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Old 22nd February 2017, 10:43 PM   #6
ricardo1e93 is offline ricardo1e93  Portugal
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Don't worry.

Yes I could ear those lows well but the place where I tested it was like cheating a bit, a kitchen with lots of resonances and reflections. But I put them outside so I would not have any of that but I can confirm that they go at least to that frequency, not very loud, but loud enough to be noticeable.

I've also noticed if I push a little bit from the low end, the highs tend to distord a bit like if the coil was to far away from where it is supposed to be and therefore it is canceled, totally understandable. But still, for a thing that has been in the corner for at least 15 years, had a rat nest in it, for how old it is, it just sounds more than fine. But they served very well, I'll put that unit in my collection.
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Old 23rd February 2017, 02:36 AM   #7
EricAuer is offline EricAuer
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Obrigado Ricardo for the information.

Eric
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Old 23rd February 2017, 01:16 PM   #8
KLBIrd is offline KLBIrd  United States
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AKAI SW-35 - Barn find rebuild
Just another version of Benjamin Onley's Acoustic Labyrinth from 1936, the grandfather of all transmission line types.
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Old 23rd February 2017, 02:50 PM   #9
ricardo1e93 is offline ricardo1e93  Portugal
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Quote:
Originally Posted by KLBIrd View Post
Just another version of Benjamin Onley's Acoustic Labyrinth from 1936, the grandfather of all transmission line types.
That's really cool to know, the more I learn. I've read a few about this type of designs, guess I should keep reading about since these speakers caught my attention.

Thanks for the info KLBIrd!
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Old 23rd February 2017, 03:50 PM   #10
phivates is offline phivates  United States
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Now if you mount the driver on the back of the box you have a proper modern offset driver TL.
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