Can these be connected to skytronic 125.061 100w 4ohm ceiling speakers?

not sure.i have them connected to jbl 100 w speakers. copes fine

Can I use it for 2 Technics speakers, 3way, 6ohm, 100w each?

I've got it wired to my old Gale Gold Mark 2, rated 6-8 ohms 100w I think? Sounds great!

I want to use a 12v adapter. What size adapter pin/head is required? I have tried a few spares that I had, but none of them fit.

OD: 5.5mm; ID: 2.5mm BT20A comes with a 24V adapter, you can find one like its size.

Can a technics direct drive turntable work via the rca input or does the turntable need a preamp?

The input sensitivity is stated as less than or equal to 280mV. If your turntable outputs I similar voltage (I guess in the range of 150 to 280mV) then I would say you probably don't need a preamp. However, if it's output is a lot less, you will need a preamp. Fosi have a range of turntable preamps to choose from. Look up the specs of your turntable to find it's output voltage range. Hope that helps.

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Fosi Audio BT20A

Product ID: 68014327

Details

Item dimensions L x W x H
13.2 x 9 x 3.6
Manufacturer
Fosi Audio
Maximum supply voltage
24 Volts
Minimum supply voltage
12 Volts
Voltage
230 Volts

📶Bluetooth 5.0 with 50ft range

🔊100W x 2 output power

🎚️Adjustable bass & treble controls

S$182

Duties & taxes included

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Description

🎵 Elevate your sound game—compact power that keeps you connected and in control!

POWERFUL STEREO OUTPUT - Unleash 200W total power for immersive, room-filling sound that commands attention.
COMPACT DURABLE DESIGN - Sleek, all-metal chassis fits stylishly anywhere—home, office, or outdoor setups without clutter.
TAILORED SOUND EXPERIENCE - Fine-tune your audio with intuitive bass and treble controls for personalized clarity and depth.
TRUSTED QUALITY WARRANTY - Engineered with TI TPA3116 chips and backed by a 24-month warranty for peace of mind.
SEAMLESS WIRELESS CONNECTIVITY - Bluetooth 5.0 ensures stable streaming up to 15 meters—ditch the cables, keep the vibe.

The Fosi Audio BT20A is a compact Class D Bluetooth amplifier delivering 100W per channel with crystal-clear sound via TI TPA3116 chips. Featuring Bluetooth 5.0 for wireless streaming up to 50ft, adjustable bass and treble controls, and a durable all-metal design, it’s perfect for enhancing home, office, or outdoor audio setups. Backed by a 2-year warranty, it offers professional-grade audio performance in a sleek, space-saving package.

Specifications

ASIN	B07BQC7GNL
Best Sellers Rank	3,301 in Electronics & Photo ( See Top 100 in Electronics & Photo ) 3 in Hi-Fi Amplifiers
Box Contents	Bluetooth Antenna x1, 32V 5A Power Supply x1
Brand Name	Fosi Audio
Country of Origin	China
Customer Reviews	4.5 4.5 out of 5 stars (8,472)
Item Weight	567 Grams
Manufacturer	Fosi Audio
Manufacturer Part Number	BT20A
Model Number	BT20A
Number of Items	1
Product Warranty	2 years
Unit Count	1.0 count

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