I used this for the rondalla ensemble in my school. The pick ups were installed in all the instruments in the rondalla; including the double bass, bandurria, laud, octavina, cajon, and guitar. It worked out quite well in concerts and performances held in the school gymnasium and in any other venue. The pick-ups are easy to install. All the pick-ups I ordered worked perfectly. If I were to amplify more instruments in school, I would buy this again.