(TrendHunter.com) The Positive Grids Spark Pearl guitar amp is a special edition version of the namesake unit for musicians to incorporate into their living space when in search of a style-conscious solution. The... (TrendHunter.com) The Positive Grids Spark Pearl guitar amp is a special edition version of the namesake unit for musicians to incorporate into their living space when in search of a style-conscious solution. The...