I recently brought an Zoom F1SP F1 Field Recorder W/SGH6 Shotgun Mic - Supports up to 24-bit/96 kHz because basically my neighbour has been using some form of speaker/amplifer or something to project sound into my house. It's audible to the human ear but my recorders or shotgun mic can't capture it. A expert did manage to clear some of the sound and confirmed the echo himself, however I require clearer audio, a device with a good frequency response especially for recording indoors, if the sound echoes.
Anything you guys can recommend?
Any advice you could provide would be deeply appreciated.