Abyss AB-1266 Phi TC vs Abyss Diana TC Signature

Both are planar magnetic open-back headphones.

The Diana TC Signature is 271 g lighter, at 369 g against 640 g.

The AB-1266 Phi TC needs 2 dB more power to reach a loud 110 dB peak, so it asks more of the amplifier.

The Diana TC Signature lists for $1,000 less.

$5,995

$4,995

Side by side

AB-1266 Phi TCDiana TC SignatureDifference

AB-1266 Phi TCDiana TC Signature

Driver: Planar magnetic; Planar magnetic
Diaphragm: Very thin, low-mass planar diaphragm; matched pairs (thickness unpublished); Ultra-thin planar diaphragm with EBR (Extended Bass Response); thickness unpublished
Driver size: 66 mm; 63 mm
Enclosure: Open-back; Open-back
Weight: 640 g; 369 g; Diana TC Signature is 271 g lighter
Impedance: 50 ohms; 72 ohms
Sensitivity: 88 dB/mW; 90 dB/mW
Power for 110 dB: 158 mW, 2.82 V; 100 mW, 2.68 V; AB-1266 Phi TC needs 2 dB more
Drive: Moderate drive; Moderate drive
Frequency response: 5 Hz – 45 kHz; 2 Hz – 58 kHz
Made in: USA (Buffalo, New York); USA (Buffalo, New York)
Released: 2019; 2026
List price: $5,995; $4,995; Diana TC Signature is $1,000 less
Materials: Aluminium Stainless steel Leather; Aluminium Leather Glass; 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 $5,995

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

List $4,995

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