By now anyone that still uses a GK250ML has had to do something about the internal speakers. Obvious solutions would be to replace them, or re-cone them. If you feel you are up to reconing there are several DIY vids on Youtube, and the recone/refoam kits run around $10-$15. BUT! even if I did replace or recone the internal 6.5 inch speakers. they'd still sound like garbage compared to a matched pair of larger speakers cabinets, so for me the solution was to remove them, converting my GK250ML to a GK250RL.
After loosening the myriad of screws to dismantle the case I labeled the power related wires, switch fuse, transformer connections etc with 2 pieces of tape so when I cut the wire, it's obvious what connects to what.
I picked out the grille, the transformer, and the head itself of course. I pulled the plug with wires going to the internal speakers. My instinct tells me doing this turns my 16ohm speaker jacks into 8ohm speaker jacks, and it hasn't blown up yet, so I'm thinking my instincts are correct in the matter.
I bent the grill to a 90, about 7 inches from the bottom,
I used some tin snips to cut indents in the grill for the fuse holder and power switch about 1 & 2 inches from the bottom (I put mine on the right).
I attached the transformer to the grille so it hangs upside down over the "motherboard", Essentially using the grille to make the ground connection between the head frame and the transformer, I used steel wool on the grill to expose the metal where I wanted to ensure good conductivity,
I finished up the wiring of the fuse, switch etc.
I cut up some pine shelving to make a cabinet, and presto a GK250RL!
Incidentally, that speaker cab is one of those ported boomer cabinets you likely hear rattling your car windows and setting off car alarms. I originally got it used for $20 and was going to put it in a car, but on a whim I hooked it up to my new (well, new to me) GK250 RL and MAN IT SOUNDS FREAKIN AWESOME ! Way more bottom end, then needed, allowing me to not have the low frequency EQ continually cranked.
Even more, the guy that posted it on Craigslist called it a a 2x10 cab, it's actually a 2x8 2 way. The tweeters are on the top of the cab, near the bass ports. This setup sounds surprisingly good for my studio work, and I suspect will be fine for gigs. The speakers are rated for 125 watts, and just like my pair of 1x12 cabs, turning the volume up to about 3, maybe 4 is plenty to keep up with a drummer volume wise.
I am actually considering selling my other cabs.... we'll see.
