Powered amps for electric guitars have gotten some neat tricks powered by modern mobile tech over the years, but the new Positive Grid Spark ($299) might be the one that packs the most intelligence ...

Digital might be a four-letter word in the guitar world, but amp and effects emulation is nothing new; it's been around for some time and it's had a chance to get really good. Californian company ...

Positive Grid has now taken the wraps off of a new guitar amp dubbed Spark that delivers the best of the company’s technology along with smart features that are all but unheard of in the industry. At ...