Acus One Forstrings 4 Ferdi in Black – Compact Acoustic Amplifier.

Elevate your acoustic performances with the Acus One Forstrings 4 Ferdi Black, the entry-level model in Acus's acclaimed Ferdi family. This ultra-portable amplifier is designed for acoustic guitars, classical instruments, and vocals, delivering crystal-clear, natural sound without coloration—true to Acus's Italian engineering heritage.

Key Features:

• Powerful Yet Portable Output: 40W (with included power adapter) or 15W via USB-C power bank for true mobility. Bi-amped two-way system with a 4" woofer (30W) and 0.7" dome tweeter (10W) for rich lows and sparkling highs.
• Versatile Connectivity: One shared channel with a TRS line input (for instruments) and XLR mic input, plus Bluetooth audio input and TRRS audio in/out—perfect for live streaming, home recording, or jamming on the go.
• Intuitive Controls: Independent volume for inputs, 2-band EQ (high & low), adjustable reverb effect, and master volume for quick, precise sound shaping.
• Premium Build: Handcrafted from birch plywood in a sleek Black Wood finish. Bass reflex housing ensures impressive projection in a compact form.

Specs at a Glance:

• Frequency Response: 70 Hz – 20 kHz
• Max SPL: 96 dB
• Sensitivity: 82 dB (1W/1m)
• Dimensions (W x H x D): Approx. 6.02" x 10.00" x 4.84" (153 x 254 x 123 mm)
• Weight: Just 5.29 lb (2.4 kg) — incredibly easy to carry
• Power: External 24V DC adapter (included) or standard 5V power bank via USB-C

Whether you're practicing in the studio, busking on the street, or performing intimate gigs, the One Forstrings 4 Ferdi Black offers professional-grade acoustic amplification in a lightweight, road-ready package. Its natural tone reproduction brings out the best in your instrument and voice, making it a favorite for singer-songwriters, classical players, and mobile musicians.

Free standard shipping within the Continental U.S. Delivery typically takes 5-8 business days. Express Shipping is available for an additional charge.

Returns:

Web orders- returns accepted within 5 days of delivery for new products and a refund is issued minus the cost of return shipping or a customer may ship back at own expense for a full refund.

In-Person purchases- returns are accepted within 5 days of purchase for new products.

Show Returns- For purchases made at shows, expo's, or meets, the return period for new items expires at the conclusion of the show's sheduled hours and dates.

Used and demo items are sold as described and may not be returned unless they arrive materially different than described. In-person purchases of used items are sold As-Is.

All returns must be in original packaging and in original, unused condition. Damages and signs of use will be assessed and charged against a refund if found.

Shipping damage- If products are damaged during shipping, it must be reported to us within 24 hours of receipt. All packaging must be retained until a damage claim is complete.