Fishman PREFIX PLUS-T ONBOARD PREAMP WIDE
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Manufacturer Information
Fishman Amps
https://www.fishman.com
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Algam SAS
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A Fishman Classic Designed for the Stage
Renowned for its quality, reliability, and performance, Fishman offers the Prefix Plus-T preamp designed to meet the demands of acoustic guitarists. This Wide Format version is intended for instruments compatible with a wide format installation, ensuring a clean and durable integration.
For Acoustic Guitarists Who Want Total Control
The Fishman Prefix Plus-T is ideal if you're looking for an acoustic guitar preamp capable of adapting to all situations: live amplification, rehearsals, recording, or playing in a band. Its equalization allows quick adjustment to resonant rooms, sensitive stage monitors, or playing styles ranging from fingerstyle to strumming, all while preserving the instrument's character.
Semi-Parametric EQ, Feedback Control, and Built-in Tuner
At the heart of the Prefix Plus-T are essential controls (volume, bass, treble) complemented by a practical semi-parametric mid scoop to isolate, boost, or cut a frequency range according to your needs. To reduce feedback issues, the Notch filter targets the problematic frequency, while the phase control helps stabilize amplification depending on the setup (monitors, position, stage type). The brilliance knob adds extra presence when you need to cut through the mix, and the low battery indicator ensures your performance is secure. Finally, the built-in chromatic tuner remains usable even without plugging in the guitar, a real time-saver before playing.
Technical specifications
| Category | acoustic preamp |
| Technology | Solid state |
| EQ | 5 channels |
| Model | Fishman Amps Prefix Plus-T Preamp |
| Format | Wide (wide format) |
| Electronics | ultra low-noise |
| Nut width | 3.2 mm |
| Controls | volume, bass, treble |
| Equalizer | semi-parametric mid scoop to isolate, boost, or cut frequencies as needed |
| Feedback control | Notch filter |
| Control | phase to counter feedback |
| Adjustment | brilliance knob |
| Tuner | built-in chromatic, usable without plugging in the guitar |
| Indicator | low battery |
| Power supply | 9 V battery |
| Battery life | 150 hours |
| Installation | professional recommended |
| Brand advantage | Fishman quality, reliability, and performance |
Questions frequently asked
Is the Large format compatible with all acoustic guitars?
The installation is designed for the Large format only, for instruments compatible with this cutout. Professional installation is recommended.
Does the tuner work without plugging in the guitar?
The built-in chromatic tuner can be used without plugging in the guitar.
How does the Fishman Prefix Plus-T reduce feedback on stage?
The Notch filter targets the problematic frequency causing feedback. The phase control helps stabilize amplification based on the position of the monitors. The brightness knob adds presence in the mix.
What is the battery life of the Fishman Prefix Plus-T preamp?
Power is supplied by a 9 V battery, with a stated life of 150 hours. A low battery indicator is provided.
What equalization settings are available?
The 5-band EQ section includes volume, bass, and treble controls, as well as a semi-parametric contour. This setup allows isolating, boosting, or cutting certain frequencies.



