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What size amp

It's typically 3.5 times the wattage of the guitarists amp. In SWR watts it would be about 5 times and in Mesa watts it would be about 2 times. :D So somewhere around 3.5 times.

After you take care of the wattage you need to pay attention to speakers/surface area. The number of speakers or the surface area of each will have the greatest impact on volume.

If you want a real complex answer, ask someone "what is the meaning of a 3dB increase?"

What is your current setup?
 
willo_bass17 said:
Do i need to have an amp that big if we are just practising?

Not normally. I know when my band practiced, I needed alot of volume though. Gigs require even more. If you want to be heard in a band situation without playing hard, you will need 600 watts or more.

Truthfully, there is alot of info missing from your question. What kind of music are you playing, how many band members, what are the guitarists using for amps, are you going to gig? There's more.

-Mike
 
willo_bass17 said:
sorry i meant if i am juat practising with my band, is there a differense between practisingwith your band and playing at a gig etc.

Oh yeah, there can be. Once again, it depends on some of the questions I asked. If you are playing acoustic gigs in coffee shops, it won't be a big difference. If you practice at your drummers house, and then play gigs for 200 or more people, it is a huge difference.

A 20W Ibanez practice amp is not going to be heard in a band situation unless you have a drummer using brushes, and one guitar player playing acoustically.

-Mike
 
How much is your budget?...that'll determine how much juice you can get. Always get the most you can afford...I found out the hard way that when I say "that should be enough". It never is. And I wish I would have spent the extra few hundred for the bigger model (of anything)