To the Seller, is the review correct, that the volume knob is not a master volume for the sub out?

The knobs, bass/treble/master, controls the Sub completely. Read the sub hook instructions carefully. For my example, Sony CS9 requires both the speaker's wires and amplifier's wires connect to the subwoofer on its back with the amp's sub out cable connecting to sub in. These connections ensure the sub and amp functioning as a whole unit.

Does it read normal usb flash drives like sandisk cruzer 128gb usb 2.0 flash drive?

[updated response] yes, it should work. tested it on a sandisk cruzer glide 64gb usb (2.0? not sure) works fine, not all but most (95%) the other usb drives i've test worked fine. there does seem to be an issue with some drives, like an old PNY drive (16GB USB 2.0) and/or how you format the disk, kinda works but songs will lag and pause for about 5 seconds then continue. i'm not sure if it has problems with the usb hardware version (e.g. 1.0 vs. 2.0 vs. 3.0), or the disk format (FAT vs. FAT32 vs. exFAT, **NTFS does not work**) or the USB disk size (their notes mention supporting up to 32GB). so for now i would recommend usb 3.0 or newer, 32GB, FAT32 format, i have tested all their supported (claimed) music file formats and they seem to work fine. (i mostly just use .mp3)

Seller, the bass & treble dials have no level marking so can you tell me: are they 0 to the left and +10 to the right, or, is it 0 straight up (aka 12

I assumed "straight up" was flat, i.e. +/-0db. It sounds good to me that way. Turning them to the left reducees bass/treble. Likewise, turning them to the right increases bass/treble, respectively. Hope this helps :-)

does this support aptx?

Hello. No, it doesn't support aptx.

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M1 PRO 320W Bluetooth Power Amplifier, 2 Channel Audio Amp, Wireless Receiver, for Home Stereo Speakers/Active Subwoofer, with Treble & Bass Control/U-Disk Music Player

Product ID: 165525283

Details

Item dimensions L x W x H
12.13 x 10.04
Manufacturer
Douk Audio
Maximum Supply Voltage
35 Volts (DC)
Minimum Supply Voltage
19 Volts
Voltage
35 Volts

🎵Supports lossless audio formats

📶Bluetooth 5.0 with extended range

🔊320W max output power

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Sold byAmazon PanamaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🎧 Elevate your sound game—because your speakers deserve the M1 PRO experience!

POWERHOUSE PERFORMANCE - Delivers a robust 160W per channel to drive even high-demand passive speakers with crystal-clear clarity.
SLEEK DURABLE DESIGN - Compact aluminum alloy chassis with gold-plated terminals combines style and longevity for your modern home setup.
AUDIOPHILE GRADE SOUND CONTROL - Fine-tune your listening experience with dedicated treble and bass adjustments for cinema-like immersion.
SEAMLESS WIRELESS CONNECTIVITY - Bluetooth 5.0 ensures stable, long-range streaming from all your favorite devices without dropouts.
VERSATILE MULTI SOURCE PLAYBACK - Supports stereo RCA, Bluetooth, and U-disk inputs playing MP3, WAV, APE, FLAC, and WMA lossless files effortlessly.

The Douk Audio M1 PRO 320W Bluetooth Power Amplifier is a compact yet powerful 2-channel amp featuring a classic TDA7498E chip, delivering up to 160W per channel. It boasts Bluetooth 5.0 with enhanced range and stability, supports multiple audio inputs including U-disk for lossless formats, and offers precise treble and bass controls. Housed in a stylish aluminum alloy case with gold-plated terminals, it’s engineered for high-fidelity, noise-free sound, perfect for home stereo and active subwoofer setups.

Specifications

ASIN	B07Y8B7RBV
Best Sellers Rank	#111,564 in Electronics ( See Top 100 in Electronics ) #704 in Audio Component Amplifiers
Brand Name	Douk Audio
Customer Reviews	4.4 4.4 out of 5 stars (671)
Item Dimensions	12.13 x 10.04 x 2.48 inches
Manufacturer	Douk Audio
Material Type	Aluminum Alloy, Gold
Maximum Output Power	320W
Maximum Supply Voltage	35 Volts (DC)
Minimum Supply Voltage	19 Volts
Model	M1 PRO
Mounting Type	Surface Mount
Number of Channels	2
Output Power	320 Watts
Package Type Name	cardboard box
Part Number	DZ071
Specification Met	Dot
Unit Count	1.0 Count
Voltage	35 Volts

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