Input Stage and Audio Performance

The input stage of the Bean Composite Amp uses an OPA1602 operational amplifier as a buffer, followed by the highly precise OPA1611 which serves as the control element of the composite feedback circuit. DC offset is filtered out by high-grade Nichicon Muse audio capacitors.

Parameter	Value
Channels	1
Output Power	60 W @ 4 Ω 40 W @ 8 Ω
THD	< 0.0001 %
Gain	20 dB (10×)
DC offset	< 2.0 mV
Supply Voltage	± 30 V
Recommended Power Supply	Bean Power Supply with power transformer (2x22 VAC, 160-200 VA for 2 modules)
Dimensions	82.0 × 57.0 × 34.0 mm
Weight	45 g

Connectivity

The module comes equipped with robust TE Connectivity connectors (Economy Power II series) for power and output connections. Included in the package are 30 cm cables for straightforward integration into your audio setup. For the audio input, a plug-in connector with screw terminals (included) provides secure and flexible connection for balanced signals.

Connector	Model
Power Supply	TE 2132781-3
Speaker Output	TE 2132781-2
Socket Contacts	TE 1744144-1
Input Signal	TE 284507-3

Cooling and Mounting

A suitable heatsink must be added depending on the desired output power and speaker load impedance. For optimal thermal performance, a heatsink with a thermal resistance of 1.5 °C/W or lower is recommended.

Adjustable Gain

The default gain of the module is +20 dB (×10), but it can be customized by adding a resistor. This requires an SMD resistor in the 0805 package and some experience with soldering surface-mount components.

Who Is It For?

This amplifier module is aimed primarily at hi-fi enthusiasts and the DIY community — anyone looking for a reliable and precise solution without the need to design their own circuit from scratch.

Interested in this module or have questions? Feel free to get in touch. I’ll be happy to help!