FB360 Mono Class-D Amplifier Kit

A high-power amplifier module designed for demanding loudspeaker systems.

This module is intended for use with floor-standing speakers and large multi-driver systems, where stable power delivery and low distortion are critical. The design prioritizes measured performance and thermal stability, ensuring consistent operation under sustained load.

The amplifier delivers 200 W into 4 Ω and uses a fully differential input and output configuration for improved noise rejection and signal integrity.

A split power supply is employed in the preamp section, removing the need for redundant input coupling capacitors in the signal path. Only two Elna Silmic II capacitors are used, preserving signal purity. Regulation for the preamp section is maintained even when the main supply voltage is reduced to 24 V DC, ensuring consistent operating conditions across a wide supply range.

An upgraded post-filter feedback (PFFB) implementation achieves class-leading performance for a TPA3255 operating in mono PBTL configuration, resulting in clean and controlled output across the audible range.

A large PCB area (130 * 100 mm), substantial heatsinking, and oversized flat-wire output inductors are used to provide effective thermal management and reliable long-term operation.

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Sept. 2025 update: optimized capacitor selection for the power supplies. Improved sound quality: deeper soundstage, finer highs, and tuned for a warmer sound.

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Package Includes
1pc SylphAudio FB360 mono
1pc JST Input connector
4pc Female Faston Tab

Specifications
Supply Voltage: 26V DC min to 52V DC max
Unclipped Power (<1% THD+N, 52V): 115W-8Ω, 210W-4Ω
Input sensitivity: 5V RMS
Voltage gain: 15dB (5.6V/V)
Input configuration: Fully Differential
Load impedance: 4Ω, or 8Ω
Footprint: 130mm x 100mm x 45mm (L * W * H)
Overcurrent /short protection: Yes
Over voltage protection: No
Overheat protection: Yes
Turn on-off pop suppression: Yes

Recommended Power Supply
(NOT INCLUDED)
– Single supply 52V SMPS, 300W or higher per module.
– DO NOT use power supply with split rails.
– RPS-500-48-C / SE-450-48 / LOF550-20B48-C adjusted to 51V to 52V
– Use 48V for unregulated “linear” supplies

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Shipping
Shipments are consolidated once a week. Kindly wait for the tracking info to become available. Courier is a European Postal affiliated company with normal shipping ETA of 5 to 8 weeks.

Contact us for combined shipping options and actual rates.

Feel free to email us at:
contact@sylphaudio.com

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Prices are subject to change without prior notice.