Boomin_tahoe 5,000+ posts
Hurtin' feelings errrday.
+The breaker could be too small. Sounds like you have about 1400 RMS from amps. 1400w / 13v=108 amps.
You might consider getting a bigger breaker before forking over cash to the shop.
I'm wondering where your getting 1400 watts from when he stated 380 watt amp and a 500 watt amp which totals 880 watts. I did the math and that pulls about 61/62 amps of current. Still doesn't explain the tripping of a 100 watt circuit breaker. My only guess is his gain might be turned up too high.