What ground do i connect to? the 12v ground of my car? or is this for a switched live? does the unit require power in some way?

If you're connecting via a T-harness (most are labeled you connect to the black (usually black) wire (note you only need to connect the earth if you're getting distortion or are using your RCA's as remote turn on

Can i only connect one speaker to this to use on my sub/amp? or shall i connect one speaker twice or can i just use one left side speaker only?

I use this with an amplifier without sub output. Just connect the converter to the speaker output on the amplifier. The output on the converter is a line level output to two phono (RCA) sockets. This works for me because my sub has two line level phono inputs. Some subs have just one phono input and if this is the case then you probably need a splitter like this one https://www.amazon.co.uk/BRIEFCEC-Extension-Cable-Point-Female/dp/B097HJQYL7/ref=sr_1_21?crid=2DL00BG1ECMED&keywords=phono%2Bto%2Btwin%2Bphono&qid=1685451919&sprefix=phono%2Bto%2Btwin%2Bphono%2Caps%2C139&sr=8-21&th=1. Good luck.

Is this suitable for bmw car stereo

Hello,As long as it meets the interface, it can beThanks

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Stereo Audio Speak Signal Hi-Low Converter for Auto Amp Subwoofer Amplifier CD Player High to Low Adapter Audio Filter Audio Filtering Noise Elimination Anti-interference Line Output Converter

Product ID: 139135244

Details

Manufacturer
BGoodVision
Maximum supply voltage
4.5 Volts
Minimum supply voltage
12 Volts (DC)
Mounting type
Surface Mount
Voltage
12 Volts

⚡12V Power Efficiency

🔊High to Low Conversion

🔧Easy Installation

Description

🎶 Elevate Your Sound Experience!

RELIABLE SUPPORT - 30-day money-back guarantee and lifetime support.
COMPACT DURABLE - Sleek metal design, measuring just 6.4 x 4.3 x 2.5 cm.
AMPLIFIER ACCESSORY - Perfect for aftermarket amplifiers without RCA outputs.
NOISE FREE EXPERIENCE - Eliminates interference for crystal-clear audio.
SEAMLESS COMPATIBILITY - Effortlessly connects to car stereos, laptops, and smartphones.

The BGoodVision Stereo Audio Speak Signal Hi-Low Converter is a compact and efficient solution for converting high audio signals to low RCA signals, ensuring compatibility with various audio devices while eliminating noise interference. With easy installation and robust support, it's the perfect accessory for enhancing your car audio system.

Specifications

ASIN	B07S8TGT37
Best Sellers Rank	30 in Car Amplifier Noise Filters
Brand	BGoodVision
Customer Reviews	4.3 4.3 out of 5 stars (622)
Global Trade Identification Number	08581700700831
Manufacturer	BGoodVision
Manufacturer Part Number	FLT-338
Maximum Supply Voltage	4.5 Volts
Minimum Supply Voltage	12 Volts (DC)
Model Number	FLT-338-FBA
Mounting Type	Surface Mount
Number of Channels	2
Number of Items	1
Package Type Name	Box
Specification Met	CE, FCC
Voltage	12 Volts

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