Abyss Diana TC Signature vs ZMF Caldera

Both are planar magnetic open-back headphones.

The Diana TC Signature needs 5 dB more power to reach a loud 110 dB peak, so it asks more of the amplifier.

The Caldera lists for $1,495 less.

$4,995

$3,499.99

Side by side

Diana TC SignatureCalderaDifference

Diana TC SignatureCaldera

Driver: Planar magnetic; Planar magnetic
Diaphragm: Ultra-thin planar diaphragm with EBR (Extended Bass Response); thickness unpublished; Four-trace, eight-pathway planar diaphragm
Driver size: 63 mm; 80 mm
Enclosure: Open-back; Open-back
Weight: 369 g; Not published
Impedance: 72 ohms; 60 ohms
Sensitivity: 90 dB/mW; ~95 dB/mW
Power for 110 dB: 100 mW, 2.68 V; 31.6 mW, 1.38 V; Diana TC Signature needs 5 dB more
Drive: Moderate drive; Easy to drive
Frequency response: 2 Hz – 58 kHz; Not published
Made in: USA (Buffalo, New York); United States
Released: 2026; 2022
List price: $4,995; $3,499.99; Caldera is $1,495 less
Materials: Aluminium Leather Glass; Aluminium Wood Leather; Both use aluminium, leather

From each maker’s published figures; sources are on each headphone’s page. Power for 110 dB is worked out from sensitivity and impedance.

Each of these has 10 dB or more in reserve above a loud 110 dB peak on both headphones, so one amplifier serves either.

List $4,995

Retailer prices checked 2026-10-21. We may earn a commission on purchases. How this works

List $3,499.99

None of the boutiques we track list this model right now. Manufacturer page: shop.zmfheadphones.com.

Retailer prices checked 2026-10-21. We may earn a commission on purchases. How this works