Fishman Loudbox 100 - Understanding Acoustic Feedback; Feedback Causes and Solutions

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Technical Specifications
Rated Power:
Cumulative 100Wrms
Woofer Amp 90Wrms continuous
Tweeter Amp 10Wrms continuous
All measurements @ nominal line 120V, 60Hz
Acoustic Response:
SPL @ 1 Meter 114dB SPL
Frequency Response 80Hz – 20kHz ± 4dB
Power Consumption: 150W max
Input Impedance:
Ch.1 10M Ohm
Ch.2, 1/4”Jack (tip) 10M Ohm
Ch.2, 1/4”Jack (ring) 10M Ohm, 10k Ohm with 15V phantom power
Ch.2, XLR Input 2.4k Ohm Balanced
Aux Input (stereo) 10k Ohm
Nominal Input Level:
Ch.1 -20dBV/-10dBV with 10dB pad
Ch.2, 1/4” Jack (tip) -20dBV/-10dBV with 10dB pad
Ch.2, 1/4” Jack (ring) -20dBV/-10dBV with 10dB pad
Ch.2, XLR Input -40dBV/-30dBV with 10dB pad
Aux Input (stereo) -10dBV
Maximum Recommended Input Level:
Ch.1 6dBV
Ch.2, 1/4”Jack (tip) 6dBV
Ch.2, 1/4”Jack (ring) 6dBV
Ch.2, XLR Input -14dBV
Aux Input (stereo) 6dBV
Phantom Power (Ch.2 Only):
XLR Input 24Vdc/1.2k Ohm dc Source Impedance per pin
1/4” Jack (ring) 15Vdc/10k Ohm dc source impedance
Tone Controls and Anti-Feedback (Ch.1 and Ch.2):
Low ± 10dB @ 100Hz (shelving)
Mid ± 12dB @ 1.2kHz (resonant)
High ± 12dB @ 10kHz (shelving)
Anti-Feedback Range -14dB @ 20– 400Hz (Hi – Q resonant)
Digital Effects:
Program 1 Hall 1
Program 2 Hall 2
Program 3 Chorus
Program 4 Plate 1
Program 5 Plate 2
Acoustic Instrument Amplifier
Loudbox 100
TM