STAX SR-007S vs ZMF Caldera Closed: which should you buy?

Specs, scores and condensed review verdicts for the STAX SR-007S vs ZMF Caldera Closed, side by side. Where a product has no HearWiki score yet, not enough reviews have been aggregated to rate it.

Over-Ear

STAX SR-007S

83Outstanding

$2,390

Full review data

Over-Ear

Score breakdown

Each axis is a 0–10 blend of what reviewers scored, not a lab measurement.

STAX SR-007S leads on 4 of 4 measures.

STAX SR-007S
ZMF Caldera Closed

HearWiki score

Sound

9.5

Value

7.2

Price (USD)

$2,390

$3,500

Specifications

SR-007SCaldera Closed

Type: Over-Ear; Over-Ear
Price (USD): $2,390; $3,500
HearWiki score: 83; Not scored
Released: 2025; 2023
Availability: Sold new; Discontinued
Driver: 2× electrostatic; 80 mm planar magnetic
Driver type: electrostatic; planar
Driver size: -; 80 mm
Drivers per side: 2; -
Frequency response: 6 Hz - 41 kHz; -
Impedance: 145000 Ω; 60 Ω
Sensitivity: 101 dB/mW; 94 dB/mW
Active noise cancelling: No; -
ANC type: none; -
Transparency mode: No; -
Companion app: No; -
Custom EQ: No; -
Wear detection: No; -
Controls: none; -
Weight: 430 g; 530 g
Detachable cable: Yes; -
USB-C: No; -
Balanced connection: -; Yes

Specification comparison of STAX SR-007S vs ZMF Caldera Closed
Spec	STAX SR-007S	ZMF Caldera Closed
Type	Over-Ear	Over-Ear
Price (USD)	$2,390	$3,500
HearWiki score	83 / 100 Outstanding	Not scored
Released	2025	2023
Audio
Driver	2× electrostatic	80 mm planar magnetic
Driver type	electrostatic	planar
Driver size	-	80 mm
Drivers per side	2	-
Frequency response	6 Hz - 41 kHz	-
Impedance	145000 Ω	60 Ω
Sensitivity	101 dB/mW	94 dB/mW
Features
Active noise cancelling	No	-
ANC type	none	-
Transparency mode	No	-
Companion app	No	-
Custom EQ	No	-
Wear detection	No	-
Controls	none	-
Design
Weight	430 g	530 g
Detachable cable	Yes	-
USB-C	No	-
Balanced connection	-	Yes

What reviewers said

STAX SR-007S

The STAX SR-007S is a refined electrostatic flagship that builds on the classic Stax formula with updated internals and comfort-focused earpads. It delivers a spacious, highly detailed soundstage with warm bass and clear treble, all while maintaining a smooth, airy presentation. This wired, over-ear design is a perfectionist's choice for those seeking an evolutionary upgrade in high-end audio.

Pro:Spacious and precise soundstage
Pro:Warm, deep bass with clear highs
Pro:Improved comfort and reduced earcup resonance

Con:Requires a dedicated electrostatic amplifier
Con:Very high impedance limits portability
Con:No built-in controls or wireless features

ZMF Caldera Closed

No summary yet - we haven't aggregated enough reviews.

Summaries are AI-condensed and paraphrased from published reviews and specs - not original hands-on testing. More on our method.

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