Hi everyone,
i have some problem in my speakers adapter whose rating is 18v,650mA.i want to replace it with a new one but in the market adapters are available with current rating of 1A or 2A,voltage rating being 18v.will it be safe to use adapter of 1A or 2A.what is implied by current rating?
Please help.Thanks for your time:

 

Yes, an adapter that's rated at 1A or 2A will work perfectly fine. Ideally, the adapter can provide up to 1A of current. In other words, if you only need 650mA, you could still have 350mA of current left to spare.

Austin

 

A 1A adapter will work fine, but unregulated adapters will supply more voltage when the load is reduced, so you should be cautious if you use an unregulated adapter capable of supplying 2A or more. However, the problem is only significant with very small loads, say below 50mA. The quescient current (that is, the current when the signal input is zero) demanded by your amp might be a bit more than that.