Quick Answer / Summary: Passive amplifier: speaker cable from its terminals to passive speakers (copper, 16-14 AWG, current-carrying). Powered speaker (active monitor): a line-level signal cable (XLR or TRS) into the speaker, plus its own mains lead. Never run speaker-level output into a powered speaker’s input – it will be damaged. Never run line-level signal into a passive speaker – silence.
“Powered amp” describes two different arrangements – an amplifier with a built-in power supply, and a speaker with the amplifier inside. The cabling differs completely, and mixing the two is the most common installation error in modern audio.
Two Meanings
Arrangement one: an amplifier unit with an internal power supply, driving passive speakers over speaker cable. Arrangement two: a powered speaker, where the amplifier lives inside the cabinet, fed by line-level signal and its own mains. Both are called ‘powered’, and the cable plans are opposites. The practical test: does the box have speaker terminals (passive) or XLR/TRS inputs plus a mains inlet (powered)? The connectors tell you which arrangement you own.
Speaker Terminals Mean Passive
Binding posts or speakON on a cabinet indicate a passive speaker expecting amplified signal.
XLR Plus Mains Means Powered
A powered speaker takes line-level signal and mains. Its inputs are not speaker-level.
Cable Consequences
Passive: current-carrying speaker cable, gauge by length and impedance, speakON above 100 W. Powered: balanced signal cable (XLR or TRS), shielded, and short enough to avoid picking up noise; the mains lead is separate. Level: powered speakers expect line level (about 1 V) – a mixer’s output is correct, a speaker-level output is destructive. Where a powered speaker feeds a passive one (rare, in some sub/satellite systems), read the manual before connecting anything.
Signal Shielding
Powered speakers amplify what they receive. A shielded balanced cable into a stage full of dimmers is the difference between quiet and humming.
Level Matching
Line level in, not speaker level. A powered speaker fed from an amplifier’s output is a warranty claim waiting to happen.
Mixed Systems and Gain Structure
Mixed rigs – powered tops with a passive sub, or the reverse – require a signal split: the mixer feeds the powered speaker at line level and the amplifier feeds the passive one at speaker level. Gain structure: set powered speaker input trims to a known point (often 0 dB or the detent), then balance with the mixer; do not use the speaker’s trim to compensate for a hot source. Document levels on the rack schedule so the next operator starts from the same place.
Split, Do Not Daisy-Chain Level
A line-level split to powered gear plus an amplifier for passive gear keeps both at their correct levels.
Trim Discipline
Mark the trim positions. Unmarked trims are how a system becomes 6 dB louder after a service visit.
Cable by Arrangement
| Arrangement | Into the Box | Cable |
|---|---|---|
| Passive amplifier | Speaker-level | 2-core speaker cable |
| Passive speaker | Speaker-level | Same run, gauge by length |
| Powered speaker | Line-level | XLR or TRS, shielded |
| Powered sub | Line-level or LFE | RCA or XLR |
Real-World Application Scenarios
A band runs a passive amplifier into two passive tops over 2-core speaker cable – one gauge, one connector type. A conference room uses powered speakers on XLR from the mixer, with no speaker cable at all. A mixed rig splits the mixer output: line level to the powered tops, speaker level to the passive sub.
Recommended Internal Resources
(1) Product cluster – https://zh-zong.com/productlist/ (anchor: speaker cable and signal cable); (2) FAQ – https://zh-zong.com/faq/ (anchor: powered versus passive questions); (3) Contact – https://zh-zong.com/contact/ (anchor: request a system cable list).
Related Reading in This Series
- Amplifiers: The Cable Decisions That Apply to Every Class
- Power Amps in a Rack: Cable Standards for Multi-Amp Systems
- Stereo Amp Setup: Cables, Balance and the First Power-Up
Frequently Asked Questions (FAQ)
Q: Can I connect an amplifier output to a powered speaker?
A: No – speaker-level output into a powered speaker’s input will damage it. Powered speakers take line-level signal.
Q: What cable do powered speakers need?
A: A shielded balanced signal cable (XLR or TRS) plus their own mains lead. No speaker cable is involved.
Q: How do I tell a passive speaker from a powered one?
A: Passive cabinets have speaker terminals (binding posts or speakON); powered ones have XLR/TRS inputs and a mains inlet.