
Originally Posted by
ICBM
The speakers are 60W, 8 ohms each, wired in series. The replacement needs to be 8 ohms as well.
The power handling of a two-speaker cabinet is twice that of the lower-rated speaker, not the sum of the two. So using a speaker of less than 60W will reduce the total power rating, but using one of greater than 60W will not increase it. How much you need depends on the power output of the amp - the cabinet needs to be able to handle at least this much, and preferably at least about 50% more to be really safe if you're going to turn it up a long way.
Some speaker combinations are already tried and tested, and known to sound good - unless you want to experiment, I'd stick to one of these (all Celestions):
G12H-30. Very popular, but it reduces the total power handling to only 60W, so if your amp is more powerful than this, you can't use it. I don't really like it for this reason - it doesn't make the best use of the individual speaker power ratings, or tones either... the V30 likes to be pushed hard (which it now can't be) and the H30 doesn't so much (but it now will be). On the other hand, if the amp is less than about 40W it makes no practical difference.
Classic Lead 80 - for some reason this speaker is very overlooked. It sounds similar to a slightly tighter, more modern G12H-30, but with 80W power handling which is perfect to go with the V30 - the total cab rating is back to 120W, but the V30 can now be driven really hard without overloading the CL80. Like the H30 it has a lot more deep bass, clearer mids and brighter top-end than the V30.
Gold - fantastic, but very expensive. It's rated at 50W so the cab rating is now 100W, which is enough for all but full 100W amps that you're going to crank right up. It sounds something like an Alnico Blue crossed with a V30 - it's chunky like the V30, but brighter at the top end and without the big mid spike, and has the 'chimey' clean tone of the Blue.
G12T-75 - sounds like an odd choice because it's one of Celestion's cheaper models and doesn't sound that great on its own, but it works very well with the V30 - the hollow, scooped and bright tone goes well with the V30's mid peak without dominating the mix, because it's less sensitive (ie slightly less loud). It also has a similar power rating to the V30, but in the right direction, so the V30 gets pushed to its limit first, and the total cab rating is still 120W.
Greenback... I'd avoid this, even though you see it used sometimes. The sensitivity is the same as the 75, but the tone is much more similar to the V30, so it ends up just sounding too quiet and makes the cab sound sound unbalanced or 'skewed' to one side, to me. It also produces a 50W total rating, which is *less* than the V30 alone, which strikes me as slightly pointless.
I'd also probably avoid mixing makes. For whatever reason I'm not totally sure, but I've never heard a mixed-brand pair that I thought really worked.