Earlier this week I was able to test four combo amps head-to-head, toe-to-toe, at More Music in Santa Cruz. All amps were tested with a Shen SB180 hybrid, Sprio Weichs, and a Full Circle. No outboard preamp was used. Here, in brief, are the results: - Henriksen JazzAmp 12: A surprisingly loud amp for 100 watts (160 with an extension speaker). Plenty of EQ control, but seemed to my ears to be lacking in some high-end definition. Set flat, it had too much midrange for my tastes, but trying to dial this out left the tone a little hollow. - Genz Benz Shuttle 3.0 10t (my current amp): Also plenty of volume, although quieter than the Henriksen. Set flat, it also seemed biased toward the mids. More success dialing some of the midrange out without losing too much tone. - Acoustic Image Contra: Even more midrange bias and seemingly less ability to EQ it out. Seemed to have plenty of power, although I know many on TB have complained about a lack of volume. Maybe I didn't spend enough time working with the EQ settings, but given its reputation (and price) I was surprised at how little of the acoustic quality of the bass it captured. - Phil Jones Flightcase 150: I knew something was different about this one when another customer walked over and said, "That sounds really good!" The volume knob had to be set at the halfway point to get as loud as the Henriksen set at 1/4, but the tone was strikingly different. The Flightcase seemed to capture more of the nuance and detail of the acoustic instrument than any of the other combos. It sounded the least like an amplifier of anything I've tried yet. This one got the ride home and my Genz Benz is now a backup.