Subwoofer Connectors Compared: The Four Inputs and Their Cables
Quick answer / TL;DR: Short answer: the four common subwoofer connectors are binding posts (speaker-level, takes speaker wire), the LFE RCA (line-level processed low-end, takes a shielded LFE cable), the line-level RCA (full-range line signal, takes a shielded RCA cable), and the Speakon (pro speaker-level, takes a Speakon cable). The connector on the sub's panel selects the cable – binding posts and Speakon are speaker-level, the two RCA types are line-level, and the sub's type determines which of the four it carries.
A subwoofer's connectors – the binding posts, the LFE RCA, the line-level RCA, the Speakon – are the hardware that select its cable, and the four are often confused because they all sit on the same rear panel. Each one carries a different signal class, takes a different cable, and serves a different sub type. Comparing the four side by side is what resolves the 'which connector, which cable' question for any sub.
This is the four-way comparison: each subwoofer connector, the signal it carries, the sub that has it, and the cable it takes – the reference that reads a sub's panel and selects the cable in one step.
The Four Connectors, Compared
| Connector | Signal class | Cable it takes | Sub that has it |
|---|---|---|---|
| Binding posts | Speaker-level | Speaker wire (14-12 AWG) | Passive, or powered (speaker-level input) |
| LFE RCA | Line-level (processed low-end) | Shielded LFE cable | Powered |
| Line-level RCA | Line-level (full-range) | Shielded RCA cable | Powered |
| Speakon | Speaker-level (pro) | Speakon cable | Pro powered |
The comparison resolves the panel: the two speaker-level connectors (binding posts, Speakon) take the speaker-level cables, and the two line-level connectors (LFE RCA, line-level RCA) take the line-level cables. The sub's type and the connection in use select among the four.
Speaker-Level Connectors: Binding Posts and Speakon
- Binding posts: the consumer and pro speaker-level standard – the sub's speaker terminals, taking speaker wire by bare conductor or banana plug
- Speakon: the pro locking speaker-level connector – the sub's pro input, taking a Speakon cable
- Both carry the amplifier's speaker-level output; the Speakon is the locking pro form, the binding post the universal form
Line-Level Connectors: LFE RCA and Line-Level RCA
- LFE RCA: the processed low-end signal from the receiver's LFE out – the conventional powered-sub input, taking a shielded LFE cable
- Line-level RCA: a full-range line signal – the powered sub's alternative input, taking a shielded RCA cable
- Both are line-level (low signal, shielded cable); the LFE carries the bass-processed signal, the line-level input the full-range signal
Reading the Panel: Which Connector Is in Use
| Panel shows | In-use connector | Cable |
|---|---|---|
| Binding posts only (no power inlet) | Binding posts – passive | Speaker wire |
| LFE RCA + power inlet | LFE RCA – powered, conventional | Shielded LFE cable |
| LFE RCA + binding posts + power inlet | Either – LFE conventional | LFE cable, or speaker wire |
| Speakon + power inlet | Speakon – pro | Speakon cable |
| Line-level RCA + power inlet | Line-level RCA – powered | Shielded RCA cable |
The panel reading selects the in-use connector and, with it, the cable. A sub showing multiple inputs offers a choice (the LFE or the speaker posts); a sub showing one input has its cable determined by that input.
Per-sub connector combinations vary by model; the knowledge base does not provide a sub connector inventory. The panel-reading table is the selection method – confirm the specific sub's inputs from its rear panel before ordering the cable.
Real-World Applications
The consumer powered sub
A powered sub showing an LFE RCA and binding posts – the panel reading selects the LFE (the conventional powered-sub input) and the shielded LFE cable, the binding posts available for the speaker-level use.
The passive theater sub
A passive sub showing binding posts and no power inlet – the panel reading selects the binding posts and the speaker wire, the speaker-level cable at the correct gauge for the run.
The pro PA sub
A pro sub showing a Speakon – the panel reading selects the Speakon and the Speakon cable, the pro locking connector, the speaker-level pro connection.
Related reading: Identifying a single connector on your sub? Read the subwoofer connector guide — blogs/news/subwoofer-connector
Related reading: Browse cables by subwoofer connector — collections/speaker-cables
Frequently Asked Questions
What are the different subwoofer connectors?
The four common ones: binding posts (speaker-level), the LFE RCA (line-level processed low-end), the line-level RCA (full-range line), and the Speakon (pro speaker-level). The sub's panel carries the ones its type and design use, and the in-use connector selects the cable.
Which subwoofer connector should I use on a powered sub?
The LFE RCA is the conventional choice for a powered sub – it carries the receiver's processed low-end signal. The binding posts (speaker-level) are the alternative for the powered-satellite use. The sub's panel and the design select between them.
Is a Speakon a different signal from a binding post?
No – both carry speaker-level signal. The Speakon is the pro locking form of the speaker-level connection; the binding post is the universal form. The connector differs, the signal class (speaker-level) is the same.
How do I match the cable to my sub's connector?
Read the in-use connector: binding posts take speaker wire, the LFE RCA takes a shielded LFE cable, the line-level RCA takes a shielded RCA cable, the Speakon takes a Speakon cable. The connector and the cable are a pair, selected together from the panel.
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