A multi-driver, in-ear monitor is provided that is coupleable to an external audio source, for example via a source input cable or a wireless receiver. A circuit, for example comprising a passive or active crossover circuit, receives the electrical signal from the external audio source and provides separate...http://www.google.es/patents/US8116502?utm_source=gb-gplus-sharePatente US8116502 - In-ear monitor with concentric sound bore configuration
In-ear monitor with concentric sound bore configuration
