For applications where more than two pairs of speakers are required installers use "100 V line" amplifiers which are specially designed to power many loudspeakers
- for example in retail environments or train stations. Visions loudspeaker & amplifiers are all "low-impedance" because of the superior sound quality & greater power output. Instead of restricting installers to one or the other Vision offers the unique add-on SP-100V transformers which simply "retrofit" to any low impedance speakers. The SP-100V inserts between the 100 V amplifier & the low impedance loudspeaker allowing any low-impedance loudspeakers need to be used with a 100 V line amplifier.