Ehrlund EAP (Ehrlund Acoustic Pickup)

Controls: none on the pickup itself

I/O: 150 cm captive cable terminating in a 6.3 mm (1/4in) 90-degree angled mono jack; requires an external EAP preamp to reach usable line/mic level

Notes: FLAG (device_class judgment call, per brief instruction): EAP is a contact/piezo pickup transducer for acoustic instruments (guitar, violin, double bass, horns), mounted with adhesive putty directly on the instrument's sound box - NOT an air-pressure condenser microphone - but is classified here as 'Microphone' per the task brief's explicit instruction. Manufacturer calls it a 'linear microphone' meaning flat/uncolored frequency response, not that it operates like a conventional mic capsule. Waterproof, rated -40C to +120C, tolerates 10 minutes in boiling water. Requires a separate EAP Preamp (see companion entries) to output a usable signal; polar_pattern/sensitivity/max_spl/impedance left blank as not applicable/not published for a contact pickup. price_usd = Front End Audio current list for the pickup alone ($219); a bundled 'EAP System' (pickup + phantom preamp) was also seen listed at $399.