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HDA digital 6-way headphone amplifier

A cost-effective digital headphone amplifier for all your headphone monitoring duties

The CEDAR HDA headphone amplifier is a 24-bit, 96kHz rackmount unit that receives an AES/EBU or SPDIF input and converts it to six individually buffered 1/4" (6.3mm) stereo headphone outputs, each with its own volume control.

Suitable for use in almost all digital environments and designed to complement CEDAR's award-winning DNS series (as well as being an integral element in the CEDAR CSS-1500 and CSS-3000 Surveillance Systems) the HDA is also perfect for use with CEDAR Cambridge and our Duo rackmounts, connecting directly to their AES/EBU (XLR) or SPDIF (phono) outputs to provide the highest quality audio directly to the headphones. It handles all standard sampling frequencies up to and including 96kHz, will decode 50/15µs emphasis, and has a dynamic range in excess of 100dB. It delivers up to 150mW per headphone output with a maximum output level of +12dBu.


Technical Specifications

Audio Specification

Output Level: Drives 150mW into 32Ω to 600Ω headphones
Dynamic Range: >100dB
Input Impedance: 110Ω ±20% AES/EBU 75Ω ±15% S/PDIF
Max Output Level: +12dBu unbalanced
Headphone Gain Range: -80dBu to +12dBu
Sample Frequency Range: 30kHz-100kHz


Digital Inputs: 1 x AES/EBU XLR 3 pin female,
1 x S/PDIF RCA phono
Headphone Outputs: 6 x ¼” (6.35mm) A/B-gauge 3-pole stereo jack sockets
Mains Input: Filtered IEC, 110V-120V, or 220-240V, fused, 10W max
Fuse Rating: Anti-surge fuse 100mA 20 x 5mm (230VAC)
Anti-surge fuse 250mA 20 x 5mm (115VAC)

Operational Controls

De-emphasis On/Off: DIP switch selection
Digital Input Select: AES/EBU or S/PDIF, via push-switch

Equipment Type

RB-DHD6: Digital 6 way stereo headphone distribution amplifier

Physical Specification

Dimensions (Raw): 48cm (W) x 10.8cm (D) x 4.2cm (H) (1U)
19” (W) x 4.3” (D) x 1.7” (H) (1U)
Dimensions (Boxed): 58.5cm (W) x 22.5cm (D) x 7cm (H)
23” (W) x 8.9” (D) x 2.8” (H)
Weight: Nett: 1.6kg  Gross: 2.2kg
Nett: 3.5lbs Gross: 4.8lbs


CEDAR HDA has been discontinued. 

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