DB has absolutely nothing to do with power ratings, Fran. And, I did try the BA330 on your recommendation here at Music Land, Bel Air, MD using my PSR-S950. It sounded weak and distorted at best.

dB Power ratio Amplitude ratio
100 10000000000 100000
90 1000000000 31623
80 100000000 10000
70 10000000 3162
60 1000000 1000
50 100000 316 .2
40 10000 100
30 1000 31 .62
20 100 10
10 10 3 .162
6 3 .981 ≈ 4 1 .995 ≈ 2
3 1 .995 ≈ 2 1 .413 ≈ √2
1 1 .259 1 .122
0 1 1
−1 0 .794 0 .891
−3 0 .501 ≈ ​1⁄2 0 .708 ≈ √​1⁄2
−6 0 .251 ≈ ​1⁄4 0 .501 ≈ ​1⁄2
−10 0 .1 0 .3162
−20 0 .01 0 .1
−30 0 .001 0 .03162
−40 0 .0001 0 .01
−50 0 .00001 0 .003162
−60 0 .000001 0 .001
−70 0 .0000001 0 .0003162
−80 0 .00000001 0 .0001
−90 0 .000000001 0 .00003162
−100 0 .0000000001 0 .00001
An example scale showing power ratios x, amplitude ratios √x, and dB equivalents 10 log10 x.

Hope this clears things up for you.

Gary