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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Fully operational. Shipping worldwide, on schedule.Customs & duties included in the price

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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: 458570626

Details

Brand
FiiO
Interface Type
USB
Mounting Type
Cable Mount
Number of Channels
2
Number of Pins
8

🎧Dual 3.5mm + 4.4mm Balanced Outputs

💽384kHz/32Bit PCM & DSD256 MQA Decoding

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

£164.83

Duties & taxes included

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Sold byAmazon UKDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🎶 Elevate your sound game—because your ears deserve the best.

COMPACT YET MIGHTY - Ultra-portable 45g design fits perfectly into your professional lifestyle—whether at your desk, in the car, or on the go.
VERSATILE DUAL OUTPUT DESIGN - Switch seamlessly between 3.5mm single-ended and 4.4mm balanced outputs for richer, more detailed audio tailored to your headphones.
POWERFUL HIGH PERFORMANCE DAC - Equipped with dual ES9219C DAC chips, delivering pristine 384kHz/32Bit PCM and native DSD256 decoding for every sonic nuance.
AUDIOPHILE GRADE WIRELESS FREEDOM - Experience crystal-clear, lossless sound with Bluetooth 5.1 supporting LDAC, aptX HD, and MQA for studio-quality streaming anywhere.
SEAMLESS CALL CONTROL INTEGRATION - Built-in cVc 8.0 noise cancellation and microphone ensure crystal-clear calls and effortless inline control compatibility.

The FiiO BTR7 is a premium portable headphone amplifier and Bluetooth receiver featuring Bluetooth 5.1 with support for high-resolution codecs like LDAC and aptX HD. It offers dual headphone outputs (3.5mm and 4.4mm balanced) and a high-performance dual ES9219C DAC capable of decoding PCM up to 384kHz/32Bit and native DSD256, including MQA 8x rendering. With built-in cVc 8.0 noise cancellation and microphone, it supports clear voice calls and inline controls, making it a versatile, compact solution for audiophiles and professionals seeking superior sound quality on the move.

Specifications

ASIN	B09ZKJ5P5R
Audio Output Mode	Single-Ended, Balanced
Best Sellers Rank	#25,106 in Electronics ( See Top 100 in Electronics ) #45 in Headphone Amps
Brand Name	FiiO
Compatible Devices	Phones, PC, Car, Home Audio Systems, Bluetooth-enabled Devices
Customer Reviews	4.4 4.4 out of 5 stars (484)
Interface	USB
Item Dimensions L x W	1.56"L x 3.29"W
Item Weight	45 g
Manufacturer	FiiO
Model	SFNS2031
Mounting Type	Cable Mount
Number of Channels	2
Number of Items	1
Number of Pins	8
Part Number	BTR7

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