My Yahmaha amplifier has flip/squeeze plugs, not the round ones I'm seeing here. Will these work?

I tried it on a flip style and they were too big. The measurement of the plug is 0.15" or 3.85mm at the tip, at the widest 0.20" or 5.3mm. Your flip connectors may be larger than my example, a quick msr of the max gauge wire you can use will answer.

Has anyone tried to solder wires into these connectors for a better connection?

We have personally not done so, but other customers have done so to make their own cables and plugs. So it is quite possible to solder them. Since we have not done so ourselves, I cannot speak on the quality connection, but we have not heard any complaints for those that have. Hope this helps!

Are the outer sleeves/barrel "holding in place" after they're securely tighten? I have similar plugs from other company that "unscrew" themselves

They have not given me any connection problems so far after several months of use, but I went to check them after I saw your question. All the outer sleeves of the plugs inserted into my receiver were loose, a few (not all) going into the wall plates were loose, and none going into any of the speakers were loose. No explanation for how or why this occurred.

Yes you are correct, this is a 4mm Banana plug.

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Description

🎧 Plug into perfection — elevate your sound, secure your vibe!

EFFORTLESS SETUP - Closed screw design ensures quick, foolproof installation without wire slippage.
POLARITY PERFECT - Color-coded collars eliminate guesswork, keeping your sound system perfectly balanced.
SECURE CONNECTION - Dual set screws lock wires firmly in place, preventing shorts and signal loss.
PREMIUM DURABILITY - 24K gold plating resists corrosion, guaranteeing crystal-clear audio signal longevity.
UNIVERSAL COMPATIBILITY - Works seamlessly with 12 to 18 AWG speaker wires for versatile home theater setups.

FosPower Banana Plugs come in a 24-piece set featuring closed screw connectors with dual screws for a secure, no-slip wire connection. Their 24K gold plating ensures corrosion resistance and superior audio signal quality. Color-coded collars simplify polarity identification, and compatibility with 12-18 AWG speaker wire makes them ideal for home theaters, amplifiers, and surround sound systems.

Specifications

Brand	FosPower
Connector Type	USB
Cable Type	Speaker
Compatible Devices	Speaker
Special Feature	24k gold plated
Recommended Uses For Product	For use with speakers, A/V receivers, amplifiers, surround sound systems, and banana wall plates that use banana style binding posts
Colour	Black
Connector Gender	Male-to-Male
Shape	Round
Number of Pins	1
Net Quantity	12.00 Count
Item Weight	7.5 Ounces
Model Name	FosPower Banana Plugs
Indoor/Outdoor Usage	Outdoor
Number of Items	1
Outer Material	Metal
Manufacturer	FosPower
Country of Origin	USA
Model number	FOSCBL-2313
Item Weight	212 g
Product Dimensions	18.8 x 14.99 x 1.02 cm; 212.62 g
Item model number	FOSCBL-2313
Item Height	0.4 Inches
Item Width	5.9 Inches
Number of Ports/Connectors	1
Connectivity Technology	USB
Are batteries included?	No
External Certification	Não aplicável

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