WTF is a Decibel ???

dB for for Dummies 

Summary? Over simplified for the real world? Every 6dB going up 

or turned down is a reasonably perceived noticeable loudness. 95dB is nice level per instrument to make out a band with Drums, Bass and a Guitar. Nobody drowns out the other player. The drummer does not have to pull back a normal wack on his drum. A guitarist gets enough level for a bit of acoustic feedback from his speaker to get some sustain on a note. Only the singer needs a mic. 

A drummer can still lift his cab without a helper.  

120dB? One dB more and everyone ends up with their ears ringing. 

95dB is a low tech number used in some communities to say just how loud a by-law officer will allow without a public execution  

of the entire band. Others (and I do not make this up) allow 

for the loudness of a vacuum cleaner when heard

outside your door.  

 

YOU NEED 

A sound level meter is a must have to win arguments, LOL. 

Most of all to buy amps. If the amp puts out 95 dB with it set how you like the tone then your drummer will not wipe you out. He is the guy with the broken volume knob attached to his arms. Keep in mind you can turn down a bit and it can be OK but if you are drowned out you have an expensive piece of junk. If however it is too loud when it hits is sweet spot everyone will make your life hell. 

If you drown out the rhythm section your audience will perceive the music as having no balz.  

Wattage on an amps specs means F. all. If has to say it is in RMS wattage to be in the ballpark. 30 watts gets you by most times. More than 50 watts can be too loud. 

The good news is a half decent meter does not need to be more than $20.00 USD. The one on the page is made by UNI-T a middle of the road brand name. I got mine on AliExpress for $15. Well made enough to kiss the floor on occasion and easy to use.