Harmony AmplifiersHarmony offers five different guitar and bass amps. The HV15 guitar amp has one input, a 15 watt output, and a 6.5" speaker. There is a similar model for bass guitars. The HV35G guitar amp is a 35 watt amplifier with one input and a 10" speaker. Again, there is a similar bass amp available as well. The HV50G guitar amp offers 50 watts of output, a high/low input, and a 12" speaker. Spring reverb is incorporated into both the HV35G and HV50G models.