AIYIMA A20 Balanced Stereo Amplifier with HPF Adjustment Home HiFi 2.0/2.1 TPA3255 Integrated Power Amplifier desktop class D amplifier PFFB with RCA/XLR Input &12V Trigger-in for Passive Speakers

1. Fully Balanced Stereo Amplifier

   Matches the tube preamp T20,building high-fidelity Hi-Fi systems.

2. Fully balanced circuitry + PFFB

   Delivers ultra-low distortion and pristine signal reproduction for high-fidelity music.

3. Desktop Amplifier

   Suitable for home theatre bookshelf speakers,indoor,office,desktop small party and so on.

1 2.1 class D amplifier 2 High-Performance 3 Home Audio System

Multifunction Pull Switch

Controls the switch status of the power amplifier and enables free switching between high-pass filter modes.

Supports XLR inputs

Mini amplifier delivers pristine sound quality, reproducing high-fidelity audio to provide exceptional clarity with high-resolution performance.

Featuring a high-pass filter

A20 features a balanced amplifier with adjustable HPF, delivering exceptional low-frequency sound quality.

With 12V Trigger input

Simplifies the switching process

You can switch on and off simultaneously with the preamplifier with 12V trigger output.

2. The LME49720 operational amp chip may be replaced.

   The A20 is compatible with multiple dual operational amplifier chips, enabling personalised sound.

4. TI TPA3255 amplifier chip integrated

   Delivers outstanding sound and extremely low distortion with Class D efficiency.

5. Advanced thermal management design

   A larger chassis and side vents with dust covers enhance heat dissipation performance.

1 A20 Amplifier 2 Operational amp chip 3 SNR Test 4 TPA3255 chip 5 Effective heatdissipation In BYPASS mode

Press and hold for three seconds to activate.

In BYPASS mode, the amplifier volume is maximized. Before switching to this mode, reduce the volume at the audio source to prevent hearing and speaker damage. This mode has memory function; long press for three seconds to exit.

1 Frant Panel 2 back panel 3 side panel

Operational amplifier chips:	LME49720*2 (plug-in), NE5532*7 (surface-mount) .Replaceable operational amplifier chips: LM4562, NE5532, OPA2604, OPA2134, JRC5532, Muse02, etc.
Other key components:	WIMA capacitors/Ruby capacitors/Japanese NJW1195 volume IC.Power amplifier chip: TPA3255
Input interfaces:	RCA, XLR
Output interfaces:	SPEAK OUT, SUB OUT
Other interfaces:	12V trigger input
Signal-to-noise ratio (SINAD):	95dB
Signal-to-noise ratio (SNR):	≥116dB
Dynamic range:	110dB

(THD+N):	Total harmonic distortion plus noise (THD+N): 0.002%
Speaker impedance:	4-8Ω.Output Power: 300W × 2 (4Ω)
Other Features:	BYPASS Volume Bypass/RCA Gain (3dB)/HPF High-Pass Filter (60-200Hz)
Supported Devices:	Mobile phones, tablets, computers, decoders, preamps, streaming devices, CD players, etc.
Output Mode:	1. Passive Speaker 2. Passive Speaker + Passive Subwoofer
Operating Voltage:	DC 24-48V
Product Dimensions:	19 x 14.2 x 4.6 cm,Packaging Dimensions: 29.6 x 22.8 x 7.7 cm ,Product Net Weight: 1115g ,Packaged Weight: 1240g (excluding power supply).
Packaging includes:	AIYIMA A20 Balanced Stereo Amplifier x1 12V Trigger Cable x1 Power Adapter x1 Manual x1 Card x1

• High-end components: The A20 hifi stereo amplifier uses the TPA3255 Class D amplifier chip and is equipped with German WIMA, Japanese Genicon, Ruby capacitors and gold-plated terminals. It delivers a maximum output power of 300 watts at 4 ohms (this requires a 48V 10A power supply), ensuring exceptional sound quality while achieving a signal-to-noise ratio (SNR) of up to 116dB and a distortion rate as low as 0.002%, resulting in extremely clear and low-distortion audio performance.
• HPF High Pass Filter Adjustment: The TPA3255 desktop amplifier features an adjustable high pass filter (HPF) with an adjustable range of 60-200Hz. It optimises mid and high frequencies for clear and transparent mid and high tones while minimising low frequency interference. It enhances clarity and creates a dynamic sound field, making it a great choice for home stereo and home theatre audio systems.
• Rich connectivity options: This 2.1 fully balanced stereo amplifier is equipped with RCA/XLR input interfaces and a 12V trigger. Balanced inputs effectively reduce noise, providing pure stereo output, and restore true sound quality through independent low-frequency drivers. The 12V trigger input interface enables synchronised control with other devices, simplifying the power switch operation process without the need for separate operations.
• Enhanced sound quality: The A20 Class D amplifier uses two LME49720 (plug-in) and seven NE5532 (surface-mount) operational amplifier chips to achieve ultra-low distortion, low noise, and extremely transparent sound quality without colouration. Different audio experiences: You can replace the LME49720 operational amplifier chip with LM4562, NE5532, OPA2604, OPA2134, JRC5532, Muse02, etc., to precisely tune the sound quality to perfection.
• BYPASS Function: The A20 Integrated Amplifier features a bypass mode, which reduces audio quality loss, making it a high-fidelity pure power amplifier. Note: In bypass mode, the amplifier volume is set to maximum. Before switching to bypass mode, please lower the volume at the source end to avoid hearing damage and speaker damage. This mode has a memory function; to exit, press and hold for three seconds.
• PFFB circuit design: A20 uses PFFB (post-filter feedback) technology to effectively overcome the common load dependence problem of Class D amplifiers, improve distortion, enhance frequency response, and thus greatly improve sound quality and performance.

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