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 Bluetooth Amplifier for Speakers, Mini Stereo 2 Channel Amp Class D, with TPA3116 Chips 100W x 2 and Bass Treble Controls, for Home Audio Outdoor Passive Desktop Bookshelf Speakers

Fosi Audio BT20A Bluetooth Amplifier for Speakers, Mini Stereo 2 Channel Amp Class D, with TPA3116 Chips 100W x 2 and Bass Treble Controls, for Home Audio Outdoor Passive Desktop Bookshelf Speakers

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

🎚️Bass & treble analog controls

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$423.88

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Sold byAmazon EcuadorDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🎵 Elevate your soundscape—small amp, massive impact!

TAILOR YOUR TONE - Intuitive bass and treble controls put you in the driver’s seat for a personalized sound experience that fits your vibe.
PLUG PLAY SIMPLICITY - Easy setup with RCA inputs and no-fuss Bluetooth pairing means you’re rocking your favorite tunes in seconds.
POWERHOUSE PERFORMANCE - Dual 100W Class D amps deliver room-filling, distortion-free sound that commands attention.
COMPACT DURABLE DESIGN - Sleek metal chassis fits anywhere—from your desktop to outdoor setups—built to last and impress.
SEAMLESS WIRELESS FREEDOM - Bluetooth 5.0 connectivity lets you stream crystal-clear audio effortlessly up to 50 feet away—cut the cords, not the quality.

The Fosi Audio BT20A is a compact, metal-bodied Bluetooth amplifier featuring dual 100W Class D TPA3116 chips for powerful, clear stereo sound. With Bluetooth 5.0 support up to 50ft, adjustable bass and treble controls, and a durable design, it’s engineered for seamless wireless streaming and customizable audio in home, office, or outdoor environments.

Specifications

ASIN	B07BQC7GNL
Best Sellers Rank	4,367 in Electronics & Photo ( See Top 100 in Electronics & Photo ) 5 in Hi-Fi Amplifiers
Brand Name	Fosi Audio
Country of Origin	China
Customer Reviews	4.5 4.5 out of 5 stars (9,803)
Item Weight	680 g
Manufacturer	Fosi Audio
Manufacturer Part Number	BT20A
Model Number	BT20A
Unit Count	1.0 count

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