Many times churches who want to upgrade their sound system do it one step at a time to keep the costs down and see how much of a sound improvement they get from each new item. While that is the cost effective and usually an appropriate way of upgrading a sound system, it is not recommended to do this with speakers and amplifiers.
Speakers and their amplifier work in tandem to create sound. An old amplifier is going to send poor quality signal to the speakers creating crackling and hiss while the cones in old speakers can come loose or rip and create a muffled vibration in your sound. Just replacing one or the other isn't going to do much good for your sound system. You need to get them both at the same time and make sure they are matched up properly.
Speakers and their amplifier need to match so that the amplifier puts out the right amount of wattage at the correct ohm load to power the speaker. If the wattage is too high and the speaker cannot handle that much then it will cause the components to crack and break. If the ohm load is too low then you won't get the clarity and volume from the speaker and you run the risk of of the speaker breaking.
So remember to replace your speaker and amplifier together. I work at Kingdom and I would be happy to make sure you get the correct match for your church size, worship style, and budget.
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in overview, you must match your ohms loading and wattage output to your speakers. your ohms load will change depending on how many speakers you have hooked to your amp and what the ohms load of each speaker is. it is ok to have a little more wattage than the speaker is rated for but never below. it is accually easier to blow a set of speakers by underpowering them, then it is to over power them.
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Tracy - Thanks for offering your sound system expertise!