Acus – ONE FORSTRINGS 5 Ferdi Black 70W Acoustic Guitar Amplifier
The all-rounder of the ONE FORSTRINGS family. Ideal for classical and acoustic string instruments. Meets the needs of the most advanced musicians.
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The Nantel Verdict
The Nantel Verdict
70W Class D amplification optimized for acoustic instruments; dual-channel input architecture (mic/line); advanced feedback suppression with transparent EQ; compact cabinet design maintaining acoustic resonance; Acus's proprietary transducer tuning for linear frequency response across classical and nylon-string instruments.
Requires standard 1/4" and XLR connectivity; internal DSP minimal—relies on external pedal boards for effects; 40-50 lb weight manageable for gigging musicians but benefits from dedicated transport case; compatible with Acus footswitch accessories for hands-free channel switching.
At this price point, the ONE FORSTRINGS 5 justifies investment through sonic fidelity and build durability. Serious acoustic players will recognize the absence of coloration as a feature, not a limitation—transparency that rewards quality instruments.
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Review by the Nantel Musique team
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ONE FORSTRINGS 5 Ferdi is a 70 Watt small band amplifier equipped with 3 separate inputs + an Aux input (TRRS audio in/out e Bluetooth audio in) equipped with independent volume and 2-band EQ.. The 3 inputs are equipped with Gain, 3-band EQ, effect send and Volume. Input 1 is also equipped with other functions: it has a Compressor and a switch that changes the characteristics of the channel according to the type of instrument selected: 1. Flat: "standard" equalization for acoustic and classical instruments. With this equalization channel 1 is identical to channels 2 and 3 2. Bass: suitable for instruments particularly rich in bass (such as electric, acoustic or double bass). 3. Jazz: suitable for electric or semi-acoustic / jazz guitar.
| Frequency response | 50 Hz -20kHz |
| Max Power out | 70W |
| Channels | 3 |
| System Format | 2 way amp |
| Woofer power | 50W |
| Tweeter Power | 20W |
| Sensivity 1W 1m | 89.6 dB |
| SPL Max | 106 dB |
| Crossover | Electronic |
| Woofer size | 5" |
| hF speaker | Dome tweeter 1" |
| Power System | External Power Adapter 24V DC (included) |
| Construction | Brich Plywood |
| Color | Cherry Wood, Black Wood |
| Height | 12.0 inch |
| Width | 9.96 inch |
| Depth | 11.02 inch |
| Weight | 16.31 lb |
| Accessories | Bluetooth receiver (Included) |
Acus Sound Engineering is an Italian manufacturer specializing in high-fidelity acoustic amplification. The company has built a reputation for designing amplifiers that preserve the natural tone and dynamics of acoustic instruments without coloration or distortion.
Known for their meticulous engineering and attention to detail, Acus amplifiers are favored by professional musicians and serious enthusiasts who demand transparent amplification. Their ONE FORSTRINGS series represents the brand's commitment to delivering studio-quality sound in portable, stage-ready solutions.
