Anyone know what the "charging off" switch is for? Why would I turn the charging ability off? The unit plays music fine with it off or on?

1) you need to switch it on to charge the unit. 2) you can set it to off to prevent it drains battery of your phone when you connect it (via usb-c not bluetooth) to your phone. 3) the unit plays music fine regardless of this switch's setting. hope it helps.

For those on ios (iphone or ipad), are you able to save your 3 custom eq settings on to btr7 from fiio control? heard there was a bug.

This is bad advice. The app is extremely easy to use and the parametric equalizer is perhaps the best feature and the reason I purchased this amp. I use iOS and saving the settings is easy and practically automatic. The custom EQ is only adjustable through the app. I’m not sure why so many people have problems using it. It seems so simple to me. My only issue is when you reset the custom EQ to default (flat), it resets all 3 at once. It would be better if you could individually reset each one.

Can this be charged while in use?

Sure can. This little amp is amazing!

Will this product increase the frequency range of my headphones? currently 20-40,000 khz, will this get it down to 10khz and improve dynamics qualiy

Your headphones' current range is 20hz to 40,000 Hz or 20hz to 40 kHz. It is already past 10 kHz, and will not reduce it. What this device will do is improve sound quality with less background noise, or hiss and so more dynamic range.

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FiiO BTR7 Headphone Amp Bluetooth Receiver High Resolution Portable DAC Supports MQA/LDAC/aptX HD 384K/32Bit DSD256 for Phone/PC/Car/Home Audio

Product ID: 650088586

Details

Brand
FiiO
Maximum supply voltage
5 Volts (DC)
Minimum supply voltage
5 Volts (DC)
Mounting type
Freestanding
Number of pins
7

⚡384kHz/32bit PCM & DSD256 Native Decoding

🎧Dual 3.5mm + 4.4mm Balanced Outputs

🔊Hi-Res Bluetooth 5.1 w/ LDAC & aptX HD

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$U12691

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Sold byAmazon UruguayDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🎶 Elevate Every Beat — Your Sound, Uncompromised.

POWERHOUSE DAC PERFORMANCE - Powered by dual ES9219C DAC chips and XMOS XUF208 decoding, enjoy native DSD256 and MQA 8x rendering for studio-quality sound clarity.
SLEEK PORTABLE AND DURABLE - Crafted from aluminum alloy and high-strength glass, this compact 45g amp fits perfectly in your professional lifestyle—whether at home, in the car, or on the move.
VERSATILE DUAL OUTPUT DESIGN - Switch effortlessly between 3.5mm single-ended and 4.4mm balanced outputs to match your headphones and unlock richer, more detailed audio layers.
SEAMLESS CONNECTIVITY CALLS - Built-in cVc 8.0 noise cancellation and microphone support ensure crystal-clear Bluetooth calls without compromising your music experience.
AUDIOPHILE GRADE WIRELESS FREEDOM - Experience crystal-clear hi-res Bluetooth 5.1 streaming with LDAC, aptX HD, and AAC support for flawless, lossless sound on the go.

The FiiO BTR7 is a premium portable headphone amplifier and Bluetooth receiver featuring Bluetooth 5.1 with hi-res codecs (LDAC, aptX HD), dual 3.5mm and 4.4mm outputs, and a high-performance DAC supporting PCM 384kHz/32bit, DSD256, and MQA 8x decoding. Designed for audiophiles and professionals, it delivers detailed, lossless sound in a sleek, durable aluminum and glass chassis, perfect for phone, PC, car, or home audio setups.

Specifications

ASIN	B09ZKJ5P5R
Audio Output Mode	Stereo
Best Sellers Rank	#56,513 in Electronics ( See Top 100 in Electronics ) #176 in Home Audio Amplifiers
Brand Name	FiiO
Compatible Devices	Smartphone, Tablet, Personal Computer, Headphone
Customer Reviews	4.4 4.4 out of 5 stars (469)
Interface	USB
Item Dimensions L x W	40L x 84W millimeters
Item Weight	45 Grams
Manufacturer	FiiO
Material Type	Aluminum alloy, High-strength glass
Maximum Supply Voltage	5 Volts (DC)
Minimum Supply Voltage	5 Volts (DC)
Model	SFNS2031
Mounting Type	Freestanding
Number of Channels	2
Number of Pins	7
Part Number	BTR7
Smart Home Compatibility	Not Smart Home Compatible
Unit Count	1 Count

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TrustScore 4.5 | 7,300+ reviews

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