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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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
7

🎧3.5mm + 4.4mm balanced outputs for ultimate audio fidelity

🔊Dual ES9219C DACs for pristine sound

🔋880mAh battery with 9h playtime & wireless charging

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HK$1556

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Sold byAmazon Hong KongDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🎶 Elevate Every Note — Portable Audiophile Power in Your Pocket

MQA DSD 256 DECODING - Supports PCM 384kHz & native DSD256 with MQA 8x rendering for audiophile-grade detail
DUAL OUTPUT POWERHOUSE - 3.5mm single-ended + 4.4mm balanced outputs deliver studio-grade sound clarity
HI RES BLUETOOTH MASTERY - Bluetooth 5.1 with LDAC, aptX HD & Adaptive for flawless wireless hi-fi
ALL DAY POWER CONVENIENCE - 880mAh battery with wired + Qi wireless charging keeps your music flowing nonstop
SEAMLESS MULTI DEVICE PAIRING - Connects to two devices simultaneously, perfect for work and play without missing a beat

The FiiO BTR7 is a cutting-edge portable Bluetooth headphone amplifier and DAC featuring dual ES9219C DAC chips, Bluetooth 5.1 with LDAC and aptX HD support, and balanced 4.4mm plus 3.5mm outputs. It delivers lossless MQA and DSD256 decoding with up to PCM 384kHz resolution, powered by an 880mAh battery supporting 9 hours of playback and both wired and wireless charging. Designed for professionals and audiophiles alike, it supports simultaneous dual-device connections and offers seamless USB DAC functionality for phones, PCs, cars, and home audio systems.

Specifications

ASIN	B09ZKJ5P5R
Audio Output Mode	Single-Ended, Balanced
Best Sellers Rank	#19,734 in Electronics ( See Top 100 in Electronics ) #35 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 (487)
Interface	USB
Item Dimensions L x W	1.56"L x 3.29"W
Item Weight	45 Grams
Manufacturer	FiiO
Material Type	Aluminum alloy, High-strength glass
Model	SFNS2031
Mounting Type	Cable Mount
Number of Channels	2
Number of Pins	7
Part Number	BTR7

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