Author Topic: Converting a 100S cabinet to a 200S?  (Read 6815 times)

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Offline boulderbass

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Converting a 100S cabinet to a 200S?
« on: November 25, 2013, 01:23:02 pm »
Hi all. I just got what I thought was a 200S on Craigslist. When I opened it up, I discovered that the top speaker chamber had no baffle board in it. On the rear cover, there's a panel that looks like it covers up a hole where there would have been a crossover or some such. There is also the standard Sunn 1/4" jack. So it looks like a 100S that someone added another 15 to.

The cabinet is somewhat beat up, so my plan is to convert it to a double 15 where each JBL (there are some eminence or something like that in it now, apparently it sounds pretty good, but it's not what I'm going for) gets its own input jack so I can then run a separate Fender head and pickup to each. The neck pickup of my Starfire will go to the lower D140 and the bridge to the upper.

So, in a way, I wonder if it much matters if the upper baffle board is there, given that my  bridge pickup doesn't generate a lot of lows. Eventually, I'd like to add the baffle board, but for now, I'm thinking of going with it as is.

Another thing I'd like to do is that since the grill cloth is pretty messed up, I'm going to replace it with a Courtenay Pollock tie-dye and I'd like to front mount the speakers. It just seems a lot easier to get speakers in and out and also will be less wear and tear on the screw holes (there are only 4 holding the back on now). I can mount the grill using magnets on small wooden risers. I've done it before and it's worked out really well. I guess in order to do it here, I'd have to remove the T-nuts, mount them on the inside and then work out gaskets for the D140s.

At first it seemed like a good deal for $250, but now I'm realizing that it's going to be some work to get it all running the way I want it. However, the previous guy used it on the road as it is now for a long time and apparently it sounded great.

Ideas? Comments? Suggestions?

Offline Sunny Boy

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Re: Converting a 100S cabinet to a 200S?
« Reply #1 on: November 26, 2013, 12:30:43 am »
What a weird and wacky coincidence.  I bought one thinking it was a 200s cab, and got the same exact thing you did!!

I've been thinking about what it would take to build an upper baffle.  There are grooves routed in the side of the cabinet for it.  Apparently, the baffles were glued in as the sides came together.  I'm trying to figure out a plan B for getting one in there.  Any ideas?  Another problem I have is that there are angles on the horizontal edge that need to be done on a table saw, which I don't have.  In the meantime, I'm using it as it is, and it sounds killer as it is.  I used to use the real deal back in the 60's, and I remember it was a great cab.  If it was better than what we both have, I need to get another one!

By the way, the guy who sold me mine scavenged the speakers for his Kustom amp. (Grrrr!)  What he gave me was a pair of vintage Jensens which were in his Kustom, and which were used also in Leslie cabs.  They sound good, but they're 16 ohm speakers instead of the 8 ohm.  What that means is that if I get another cabinet to run with this, I need to buy speakers too.  (double Grrrrrr!!!)  The good news was that I only paid $100 for what I have.

Keep us posted, please.  I'd like to know how this develops for you.

Offline boulderbass

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Re: Converting a 100S cabinet to a 200S?
« Reply #2 on: November 26, 2013, 01:01:59 am »
Thanks for checking in. I have an email into Conrad. We'll see what he says. I got this because I have some JBLs ready to go. My other 200S has 16 ohm K140s, so it's an 8 ohm cab. It does sound great.

I definitely seem the same issues that you point out. We'll see if there is a good option. I also don't have tools to deal with this, but I might know some people. Also, some people on the forum have built clones, so I'm hoping I can convince one of them to cut the pieces for me.


Offline Sunny Boy

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Re: Converting a 100S cabinet to a 200S?
« Reply #3 on: November 26, 2013, 03:22:38 pm »
I do have the basic plans for the cab that Conrad was good enough to send me - I'm sure he'll probably send to to you as well, or I'll be happy to pass the diagram along.  If you figure out how to get the baffle into the existing routs in the sides, please let me know.  I suppose one could find a place that does mill-work, give them the specs and have them make the pieces for the baffle with the correct angle.   

I'll peek in from time to time.  I'm interested in knowing how you make out.

S.B.

Offline boulderbass

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Re: Converting a 100S cabinet to a 200S?
« Reply #4 on: November 26, 2013, 06:38:27 pm »
So if I get a baffle board (and the little piece it snugs up to) made, should I have one made for you, too?

Offline Sunny Boy

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Re: Converting a 100S cabinet to a 200S?
« Reply #5 on: November 27, 2013, 06:05:22 pm »
Oh, that would be very cool, I'd love it! :-)

Offline boulderbass

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Re: Converting a 100S cabinet to a 200S?
« Reply #6 on: November 28, 2013, 10:35:28 am »
Oh, that would be very cool, I'd love it! :-)

OK, I've a got a student who's a skilled woodworker. If I can get the dimensions and angles I need, I'll see about getting it done. The cost should be pretty reasonable.

Affixing it to the interior of the cabinet should be not too difficult. We might have to make it a little shorter than the standard size so it can fit into the slot on one side and then just glue the other side to a piece of wood to use as a cleat.

Offline Sunny Boy

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Re: Converting a 100S cabinet to a 200S?
« Reply #7 on: November 28, 2013, 06:14:55 pm »
I've found the PDF file that Mr. Sundholm sent me.  It shows the assembly from the side.  The baffle is at a 45 degree angle to the horizontal slat that is positioned at the port. I'd attach the file to this post if I could figure out how.

Offline Sunny Boy

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Re: Converting a 100S cabinet to a 200S?
« Reply #8 on: November 28, 2013, 06:27:40 pm »
Try this and tell if it works.

https://www.dropbox.com/s/xzti73t8daz1msi/200S%20Cab%20Side%20View.pdf

This shows that the baffle is 1/2" thicK, set into a 1/2" dado routed to a depth of 1/4".
The horizontal slot is 3/4" thick, set into a 13/4" dado routed to a depth of 1/4".
The angle is 45 degrees.

Are your sides also pre-routed to accept the baffle, as mine are?


Offline boulderbass

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Re: Converting a 100S cabinet to a 200S?
« Reply #9 on: November 29, 2013, 10:14:37 am »
Try this and tell if it works.

https://www.dropbox.com/s/xzti73t8daz1msi/200S%20Cab%20Side%20View.pdf

This shows that the baffle is 1/2" thicK, set into a 1/2" dado routed to a depth of 1/4".
The horizontal slot is 3/4" thick, set into a 13/4" dado routed to a depth of 1/4".
The angle is 45 degrees.

Are your sides also pre-routed to accept the baffle, as mine are?

Yes, I believe they are. It's going to be interesting getting the baffle into both slots, which is why I'm thinking about making it just a smidgen (I guess .25") short, so it will fit all the way into one side to get it to fit and then just gluing it in. But I'll ask my carpenter friend about it.

I got the document and that's great for the angles. Do you know what the official size of the baffle is supposed to be? I guess I could just measure the one that's in there.

Thanks!


I'm going to be putting the JBLs in and wiring for stereo in the next few days. It will have its first gig on the 7th.

Offline Sunny Boy

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Re: Converting a 100S cabinet to a 200S?
« Reply #10 on: November 29, 2013, 04:40:31 pm »


I got the document and that's great for the angles. Do you know what the official size of the baffle is supposed to be? I guess I could just measure the one that's in there.

I don't have any other documented specs, other than the one pfd file.  But the top is the same same as the bottom.

Offline Sunny Boy

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Re: Converting a 100S cabinet to a 200S?
« Reply #11 on: November 30, 2013, 10:18:09 pm »
I'm just thinking . . . if that baffle were cut to a width that would allow one side to fit fully into the 1/4" side rout, with the other side meeting exactly flush with the other side of the cabinet (outside edge of the rout), then it should be fairly easy to get that opposite side into the rout and and slide it back to a depth of 1/8".  That would provide a 1/8" glue surface on each side to the top and bottom edges of the baffle, which is approximately 9.5" wide.

Combined with edge glued at the horizontal port - about 22" from side to side - that should be sufficient glue surface without having to add reenforcing cleats.  There's not going to be any physical stress on it, only some vibration. What do you think?

Offline ROCKETBRO2

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Re: Converting a 100S cabinet to a 200S?
« Reply #12 on: December 02, 2013, 04:32:48 pm »
If you were to get unwanted vibrations, you could always add the cleats later.
73 CONCERT BASS,215 ORION

Offline boulderbass

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Re: Converting a 100S cabinet to a 200S?
« Reply #13 on: December 03, 2013, 02:25:24 pm »
OK, the JBLs are in there and stereo wiring installed. I've got to say that unless my D140s are really different from each other for some reason, the one with the baffle sounds a lot deeper than the one without. The baffle seems to make a pretty big difference.

Mine does not have the rout on the side for the baffle, so either I'd have to see if my guy can add it or just go with a cleated and glued arrangement.

I'll be bringing it to my gig on Saturday to see what it sounds like on stage.