307-Type Gold-Plated Binding Posts – 4mm Banana Socket for Speaker & Amplifier Panel Mount

307-type gold-plated binding posts for speaker cabinet and amplifier panel mount applications. The 307 designation refers to the standard binding post format with a 4mm banana socket (accepts 4mm banana plugs), a knurled nut for bare wire connection, and a threaded body for panel mounting. Gold plating on the contact surfaces provides low contact resistance and long-term corrosion resistance — critical for speaker connections where contact resistance directly affects signal quality and power transfer efficiency. Available in red (positive) and black (negative) for polarity identification.

Key Specifications

• Type: 307-type binding post (4mm banana socket)
• Contact Material: Brass, gold-plated
• Body Material: ABS plastic insulator + brass threaded body
• Current Rating: 30–50A (depending on contact area and wire gauge)
• Voltage Rating: 1000V DC / 600V AC
• Panel Hole: 8mm diameter
• Wire Entry: Knurled nut accepts bare wire up to 4mm² (12AWG)
• Banana Socket: 4mm (accepts standard 4mm banana plugs)
• Colors: Red and black (select above)
• Quantity: 10, 20, or 40 pieces (select above)

Binding Post Connection Methods

• 4mm banana plug: Insert banana plug into the center socket. Provides the lowest resistance, most reliable connection. Standard for test equipment and high-quality speaker cables with banana plug terminations.
• Bare wire: Loosen the knurled nut, insert stripped wire into the hole in the post shaft, tighten the nut. Accepts wire up to approximately 4mm² (12AWG). For stranded wire, twist the strands tightly before insertion to prevent individual strands from escaping the clamp.
• Spade terminal: Some binding posts accept spade (fork) terminals under the knurled nut. Verify the post design before ordering spade-terminated cables.

Frequently Asked Questions

What is the difference between 307-type and 308-type binding posts?

307-type binding posts have a standard-height insulator body — the most common format for speaker cabinets and amplifier panels. 308-type (also called “short” or “flush” binding posts) have a lower-profile insulator, providing a more compact panel installation. Both accept 4mm banana plugs and bare wire. The functional difference is minimal — select based on the panel space available and the aesthetic preference for the installation.

Can I use these binding posts for speaker connections?

Yes. Binding posts are the standard connection method for passive speaker cabinets and amplifier speaker outputs. For speaker connections, use the 4mm banana plug method for the lowest resistance connection, or bare wire for a direct connection. The 30–50A current rating is more than adequate for speaker connections — even a 1000W amplifier at 8Ω draws only 11A RMS.

What panel thickness do these binding posts accommodate?

Standard 307-type binding posts accommodate panel thicknesses of 1–6mm. The threaded body passes through the 8mm panel hole; the nut tightens from the rear. For thicker panels, use binding posts with a longer threaded body, or countersink the panel hole to reduce the effective panel thickness at the mounting point.

Should I use red and black binding posts in pairs?

Yes. Red = positive terminal, Black = negative terminal — this is the universal convention for speaker and amplifier connections. Using matched red/black pairs prevents polarity reversal errors during cable connection. Polarity reversal on speaker connections causes phase cancellation between speakers, reducing bass response and imaging quality.

Typical Applications

• Speaker cabinets: Input terminals on passive speaker cabinets
• Amplifiers: Speaker output terminals on integrated and power amplifiers
• Test equipment: Output terminals on bench power supplies and signal generators
• DIY audio: Custom amplifier and speaker cabinet builds
• Laboratory: High-current connection points on test fixtures and power supplies

Package Contents

10, 20, or 40 pieces (select above) — 307-type gold-plated binding posts (color as selected). Mounting nut and washer included.