Home » VintageKustom.com » Comment Board » Is this blasphemy ?? Converting 3-12 cab to 2-12 + 2-10

Show: Today's Messages :: Polls :: Message Navigator

Is this blasphemy ?? Converting 3-12 cab to 2-12 + 2-10 [message #14549] Sat, 16 October 2010 20:47   braud357 Messages: 154 Registered: July 2010 Location: Louisiana Senior Member I recently purchased a very nice 3-12 black cabinet w/Jensen's. I intend to use it for bass, and I know that the Jensen's are guitar speakers. I was browsing the old literature the other day and noticed that Kustom offered a 2-12 + 2-10 cabinet in the same cab as the 3-12. This started me thinking - "what if"?? I did some measuring - and see that, yes indeed - 2-10's will fit horizonally. My original plan was to purchase another cabinet (a 2-15) so I could use both of my heads (K200-B1 & K200B5). I also have 2 brand-new Eminence Delta 12's in 8 ohm that I could use. All I would need would be a couple of 10's, some new grill cloth, an additional jack and plate, and construct a new baffle board.I have had the cabinet completely apart - so I know how it all works. I have limited space to store my gear, so this would be a good deal for me. I seem to remember that in this type of factory cabinet - the 10's were sectioned off from the 12's, and rear vented. I would not do this if I do the conversion. I think that it should sound good - what do you fellows think ?? Report message to a moderator

Re: Is this blasphemy ?? Converting 3-12 cab to 2-12 + 2-10 [message #14550 is a reply to message #14549] Sun, 17 October 2010 11:27 BC Messages: 583 Registered: March 2000 Location: Kentucky Senior Member Keep your original baffle(speaker) board and the world is your oyster. There has been debate on this site in the past as to whether the 2x15 cabinet truly has enough volume (as in space ) for 2 15" speakers. I have personally dreamed of converting a 3x12 to a 2x15 configuration to see if the additional room would give a better sound. You could also try a 1x15 or 1x18 with 2x10 or 1x12 on top. With all of that said....as long as you keep the original parts so the cabinet could be returned to original and the cabinet is not permanently altered you are simply doing research and development! So, get out the socket set and remove the original board. Cut a new piece of plywood to your desired configuration. Cover it with Parts Express grill cloth #261-800 and have fun! Let us know how it turns out! BC Report message to a moderator

Re: Is this blasphemy ?? Converting 3-12 cab to 2-12 + 2-10 [message #14555 is a reply to message #14549] Mon, 18 October 2010 07:49   stevem Messages: 4739 Registered: June 2004 Location: NY Senior Member Although those Jensens are concidered Guitar drives in a Kustom, these are the same model Jensen drivers used in Hammond leslie`s for the woffer! If I new that powering them with a limit of some 60 to 70 watts would be loud enought for my Bass playing needs you could use them without much fear of killing them. Report message to a moderator

Re: Is this blasphemy ?? Converting 3-12 cab to 2-12 + 2-10 [message #14606 is a reply to message #14549] Sun, 24 October 2010 20:05   braud357 Messages: 154 Registered: July 2010 Location: Louisiana Senior Member Well, the plan is coming together ! I spent the day today (Sunday) fabricating a new baffle boad to accomodate 2-10's and 2-12's. Used some 3/4" birch plywood, and made the grille stand-off mouldings out of 1/4 x 1 1/2 lattice moulding. I made the port plates from 1/4 plywood. I am using t-nuts and machine screws instead of the traditional speaker mounting bolts. I was concerned about getting the baffle mounting holes to match the cabinet, but it is a perfect fit (whew !). All that is left to do is to paint it and install the grille cloth. The speakers I am using are (2) Carvin (Eminence) PS12-8 12's, and (2) Fender (Eminence) 10's. The Carvins are basically Eminence Delta 12A's and are rated 300 Watts. The 10's look exactly like the Eminence Legends and are rated 150 Watts. I intend to use 2 heads (a K200-B1 and a K200-B5) to push them - one amp for the 10's and one amp for the 12's. I installed a Penn-Elrod double jack dish on the back. I know that the purists may cringe at modifying a cab like this, but the beauty of it is that I can always reinstall the 3-12 baffle and return it to stock. I am going to use this cabinet, not just look at it! I am going to take some pictures tomorrow, and if I can figure out how to post them, I will share them with you here. Report message to a moderator

Re: Is this blasphemy ?? Converting 3-12 cab to 2-12 + 2-10 [message #14608 is a reply to message #14606] Sun, 24 October 2010 21:12   pleat Messages: 1452 Registered: June 2004 Location: Belding, Mi Senior Member I think that is fantastic way to wire the cabinet. The 10"s on one amp, and the 12"s on the other amp. Are the 10"s in a seperate chamber within the cabinet or are you letting all the internal air space in the cabinet going to the ports? There are a lot of tonal arrangements that I can envision using two heads to drive each pair. Seperate tones and gains. Sweet! I posted a simple way to kill the reverb on the K200B-5 without having to remove the pan. You might want to experiment with using the PA to drive the 10"s with just a bit of reverb. Let us know how it turns out. pleat Report message to a moderator

Re: Is this blasphemy ?? Converting 3-12 cab to 2-12 + 2-10 [message #14619 is a reply to message #14608] Mon, 25 October 2010 15:27   braud357 Messages: 154 Registered: July 2010 Location: Louisiana Senior Member Hello Pleat - I am leaving the cabinet interior "as is" - just the partial shelfs that are attached to the back panel supports. I may do some additional bracing to support those - a couple of screws and some staples does not seem adequate !! Report message to a moderator

Re: Is this blasphemy ?? Converting 3-12 cab to 2-12 + 2-10 [message #14623 is a reply to message #14619] Mon, 25 October 2010 16:23   pleat Messages: 1452 Registered: June 2004 Location: Belding, Mi Senior Member I think some good glue to make sure the center support braces are secured to the baffle board, then when the back is screwed in place you have have a strong bracing for the cab. The original 2x10" over the 2x12"s the 10" were seperated inside the cab and vented in the rear. The 2x12" used the ports to vent that part of the cabinet. Since your using all speakers for bass, it will be interesting to see how it sounds, and it will for sure look great on stage with T&R. pleat Report message to a moderator

Previous Topic:	New to the Board
Next Topic:	New Member needs help!

Goto Forum:

- VintageKustom.com  Comment Board  Replacement Part Suggestions  Repairing Kustom Amps- Classified Ads  For Sale  Wanted- FUDforum Questions & Problems  Questions & Problems about FUDforum