Description
Eliminate ground loop hum and safely connect mismatched audio circuits using the Valcom VMT-2, a 600-ohm audio isolation transformer with screw terminal connections and a compact wall-mountable housing for clean in-line audio signal management.
The Telecom Spot Expert Review
Ground loop hum is a persistent problem in paging and distributed audio installations where multiple pieces of equipment share a common audio path but originate from different power sources or grounding points. The VMT-2 breaks that ground connection magnetically — audio passes through the transformer core while the electrical ground reference on each side stays isolated. This eliminates the 60Hz hum that otherwise enters the audio chain and reduces speech intelligibility. The 600-ohm impedance rating matches the standard line-level audio specification used throughout commercial telephony and paging equipment, making it a direct fit for connecting amplifiers, telephone interfaces, and audio sources without impedance mismatch. Screw terminal connections handle the wiring without specialty connectors, and the wall-mount footprint keeps it organized inside an equipment enclosure or at a wall location near the audio equipment it serves.
Key Features
- 600-ohm audio isolation transformer eliminates ground loop hum in paging and distributed audio systems
- Magnetically couples line-level audio while isolating electrical ground references
- Screw terminal connections for simple field wiring
- Compact footprint, wall mountable
- Suited for connecting paging amplifiers, telephone interfaces, and external audio sources
Technical Specifications
| Model | VMT-2 |
|---|---|
| Type | Audio Isolation Transformer |
| Impedance | 600 Ohm |
| Connections | Screw terminals |
| Mounting | Wall mountable |