How can this amp deliver 200w (output power: 50w+50w+100w) if the power supply only delivers 100w? at the same time it says the psu is ’matched’?

I believe some of the specs for this amp are inaccurate and I'm not sure what the actual ratings are. Regardless, I have been running this amp for a year with speakers from a 540W Sony MHC-EC909IP https://www.amazon.com/Sony-MHCEC909iP-System-Discontinued-Manufacturer/dp/B003GZDB1Q after the main unit broke. This amp drives the speakers just as well as the Sony unit and I was happily surprised with its performance. Again, Im unsure of the actual specs, but I wanted to give you a reference of the amps actual capabilities.

How can this amp deliver 200w (50w+50w+100w) if the power supply only delivers 100w?

With the power supply it comes with, it can't. Most people will be happy with 100w total watts, especially since it can be divided between the channels moment by moment. That's better than a 25x2+50W amp, since the sub on this could be driven with all the input power, if there was no audio needing the L & R. However, yes, if you want to get the full power out of this amp, and it has honest ratings, and won't distort or overheat at full output, you'd need to buy at least a 250W PSU (assuming 80% efficiency at full load). A 24V 10A supply isn't unusual, but will run about $40 if you don't get the absolute cheapest one out there.

Can i use an a/b switch at the input to switch between a cd player,and,a turntable?

Yes you can !!!!! But you will need a pre amplifier for the turntable if it a mag. cartage !!!!!

if I turn up the master volume does the sub volume increase with it, or do I need to adjust the bass volume to not be drowned out by speakers

The Master volume controls ALL the channels, including the subwoofer. The BASS VOL volune knob adjusts the subwoofer volume only, so you can set it as desired relative to the main L & R channels, along with the FREQ knob, which adjusts the subwoofer hi-frequency cutoff. Once you’ve got the proper balance set, then you use the Master volume to adjust the overall listening level. The TREBLE and BASS knobs adjust these frequencies for ALL channels, according to you preference.

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🎶 Elevate Your Audio Game with Fosi!

UNLEASH YOUR SOUND - Experience 320 watts of pure audio power that transforms your space into a concert hall.
SEAMLESS CONNECTIVITY - Bluetooth 5.0 ensures a lag-free connection with all your favorite devices.
USER FRIENDLY CONTROL - Customize your listening experience with intuitive knobs for bass, treble, and volume.
HI FI AUDIO EXPERIENCE - Enjoy crystal-clear sound with advanced circuit design for audiophiles.
VERSATILE PLAYBACK OPTIONS - Supports multiple audio formats and connection methods for ultimate flexibility.

The Fosi Audio BL20C is a compact yet powerful 2.1 channel stereo amplifier featuring Bluetooth 5.0 connectivity, capable of delivering up to 320 watts of audio power. It supports various audio formats and offers user-friendly controls, making it an ideal choice for enhancing your home audio experience.

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Color	Black
Connectivity Technology	Bluetooth, USB
Audio Output Type	Speakers
Control Method	Touch
Wireless Technology	Bluetooth
Number of Channels	2
Format	WMA, WAV
Number of Audio Channels	2.1 Channel
Wattage	320 watts
Controller Type	Android
Audio Output Mode	Stereo
Compatible Devices	Smartphone, Speaker
Output Wattage	320 Watts
Connector Type	RCA
Output Power	320 Watts
Additional Features	Volume Control

Fosi AudioBL20C Bluetooth 5.0 Stereo Audio Receiver Amplifier 320 Watts 2.1 CH Mini Hi-Fi Class D TDA7498E Integrated Amp U-Disk Player for Home Passive Speakers Powered Subwoofer(with Power Supply)

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