STAX does not use a conventional dynamic or planar-magnetic headphone system. Its “earspeakers” use electrostatic transducers and are designed to be powered by a compatible STAX driver unit. That system requirement is the first thing to understand before comparing models or prices.
Quick answer: A STAX purchase is usually a system decision: choose the electrostatic earspeaker, then the compatible STAX driver unit and source connection. Do not plan to plug a standard STAX Pro-bias earspeaker directly into an ordinary headphone jack or conventional headphone amplifier.
How the STAX Electrostatic Driver Works
STAX describes a very thin polymer diaphragm suspended between two fixed electrodes. The diaphragm receives a bias voltage and moves in response to the changing electrostatic field. See STAX's official explanation of its electrostatic earspeaker principle.
| Decision area | What to verify | Why it matters |
|---|---|---|
| Earspeaker | Current model, enclosure, cable, Pro-bias requirement, fit and replacement parts | The headphone itself is only one part of the electrostatic signal chain. |
| Driver unit | Compatible STAX driver, input type, output socket, voltage requirements and region | STAX explicitly says its earspeakers are designed to be driven by STAX driver units. |
| Source chain | DAC, preamp or line-level source feeding the driver unit | A conventional headphone output is not the normal connection path for the electrostatic earspeaker. |
STAX Calls Them Earspeakers
The current STAX catalog includes models such as SR-X9000, SR-009S, SR-009D, SR-007S, SR-L700 MK2, SR-L500 MK2 and SR-X1. The company uses “earspeaker” for its electrostatic headphones, while its SRM products are the driver units that energize them.
A Driver Unit Is Required
STAX states that its earspeakers are designed to be driven by STAX drivers only. Current driver units include solid-state and tube-hybrid designs with different inputs and outputs. When pricing a system, include the driver rather than comparing the earspeaker price with a conventional headphone alone.
Do Not Confuse Electrostatic With Planar Magnetic
Both can use thin diaphragms, but the operating principle and amplification requirements are different. Planar-magnetic headphones are commonly driven by conventional headphone amplifiers when the source has enough power; STAX Pro-bias electrostatic earspeakers use the company's specialized high-voltage driver system. For the magnetic-driver side of that comparison, see the planar magnetic headphone guide.
Check Service and Distributor Support
STAX maintains current product, distributor, and repair information on its site. Because the system contains specialized connectors and high-voltage electrostatic drive electronics, official regional support is a practical part of the purchase decision.
Frequently Asked Questions
Can I plug STAX headphones into a normal headphone amp?
Not the standard Pro-bias earspeakers. STAX states that its earspeakers are designed to be driven by STAX driver units.
Are STAX headphones planar magnetic?
No. STAX earspeakers use electrostatic transducers with a biased diaphragm between fixed electrodes.
What else do I need with a STAX earspeaker?
You need a compatible STAX driver unit plus a source connected to that driver. Check the exact earspeaker and driver inputs before buying.
