Help with replaceing a Blown bass cab speaker

[Seedy]

I have a Marshall Dynamic bass system cab, 7212, that I have been gigging with for 10 years. I blew a speaker this weekend and I am not sure what exactly I should replace it with. The cone blasted right off. I know that this line is out of production, but the back of the cab indicates it is 400 Watts RMS at 4 ohms. Since it is two speakers, do I need two 8 ohm speakers? Or two 4 ohms? It has Marshall Eminence speakers in there but does not say the impedence requirements on the individual speakers, just on the cab as a whole.

Thanks.

[Muff_Diver]

[waltdogg]

speakers are always matched in cabs. if you wanted to keep the impedance the same get two new 4 ohm speakers, wire it up the same and call it a day. it's up to you though. also if you don't mind some potential weirdness you can just get a single 4 ohm speaker and replace the blown one with it. and there's reconing as well. as for power handling, a cab can only handle as much as it's weakest speaker times the number of speakers in the cab. so if you got a 200 watt speaker to replace the blown out 400 watt speaker, the cab's handling would be lowered to 400 watts total instead of 800 like it would be with the original two 400 watt speakers.

[crochambeau]

get two new 4 ohm speakers, wire it up the same and call it a day

Change that to 8 ohms and wire them in parallel.

Sometimes mismatching drivers can be magical, but most of the time there's an efficiency disparity and one of them will seem "quiet" compared to the other. Slapping some used piece of shit in there to get you through the day won't hurt anything, though if you prefer to cheap out make sure you've got a screw gun instead of an old fashioned screw driver unless you really want to have Popeye's forearms.

Also, if you're dredging the pond for really old shit, take note that polarity markings have not always been universal, and performing the 9 volt battery test and observing the same "push" (or "pull") to the cones is critical to not sounding like an asshole.

[Seedy]

get two new 4 ohm speakers, wire it up the same and call it a day

Change that to 8 ohms and wire them in parallel.

Thank you all. I plan to replace both speakers. I gathered from the graph that I would need two 8 ohms speakers, in parallel, to be part of a single 4 ohm cab but was still confused.

I do not need to be vintage or whatever, the DBS were made from like 1996-2001, hardly a classic. But man it is a monster with my Sunn concert bass head. I also have the DBS 7210 (2x10", also 400 watts at 4ohm) but I never play the whole stack with my Sunn because it is a 4 ohm head and wouldn't be able to handle both cabs. So I keep the big one at my band's rehearsal space and the small one in my house.

Any preferred speaker brands? Otherwise I'll stick with Marshall Eminence I guess. I use this amp for bass and baritone primarily, all with copious amounts of fuzz.

[waltdogg]

ah i misread back of the cab as back of the speaker.

[rickenbastard]

Most cab builders I know are really hyped on Ted Weber speakers. I like mine and I'll be getting more in my next cab.